sql_prepare.cc 87.1 KB
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/* Copyright (C) 1995-2002 MySQL AB

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation; version 2 of the License.
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   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
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   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA */
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/**********************************************************************
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This file contains the implementation of prepared statements.
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When one prepares a statement:
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  - Server gets the query from client with command 'COM_STMT_PREPARE';
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    in the following format:
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    [COM_STMT_PREPARE:1] [query]
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  - Parse the query and recognize any parameter markers '?' and
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    store its information list in lex->param_list
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  - Allocate a new statement for this prepare; and keep this in
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    'thd->stmt_map'.
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  - Without executing the query, return back to client the total
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    number of parameters along with result-set metadata information
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    (if any) in the following format:
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    [STMT_ID:4]
    [Column_count:2]
    [Param_count:2]
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    [Params meta info (stubs only for now)]  (if Param_count > 0)
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    [Columns meta info] (if Column_count > 0)
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When one executes a statement:
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  - Server gets the command 'COM_STMT_EXECUTE' to execute the
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    previously prepared query. If there are any parameter markers, then the
    client will send the data in the following format:
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    [COM_STMT_EXECUTE:1]
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    [STMT_ID:4]
    [NULL_BITS:(param_count+7)/8)]
    [TYPES_SUPPLIED_BY_CLIENT(0/1):1]
    [[length]data]
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    [[length]data] .. [[length]data].
    (Note: Except for string/binary types; all other types will not be
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    supplied with length field)
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  - If it is a first execute or types of parameters were altered by client,
    then setup the conversion routines.
  - Assign parameter items from the supplied data.
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  - Execute the query without re-parsing and send back the results
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    to client

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When one supplies long data for a placeholder:
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  - Server gets the long data in pieces with command type
    'COM_STMT_SEND_LONG_DATA'.
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  - The packet recieved will have the format as:
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    [COM_STMT_SEND_LONG_DATA:1][STMT_ID:4][parameter_number:2][data]
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  - data from the packet is appended to the long data value buffer for this
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    placeholder.
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  - It's up to the client to stop supplying data chunks at any point. The
    server doesn't care; also, the server doesn't notify the client whether
    it got the data or not; if there is any error, then it will be returned
    at statement execute.
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***********************************************************************/

#include "mysql_priv.h"
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#include "sql_select.h" // for JOIN
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#include "sql_cursor.h"
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#include "sp_head.h"
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#include "sp.h"
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#include "sp_cache.h"
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#ifdef EMBEDDED_LIBRARY
/* include MYSQL_BIND headers */
#include <mysql.h>
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#else
#include <mysql_com.h>
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#endif
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/* A result class used to send cursor rows using the binary protocol. */

class Select_fetch_protocol_prep: public select_send
{
  Protocol_prep protocol;
public:
  Select_fetch_protocol_prep(THD *thd);
  virtual bool send_fields(List<Item> &list, uint flags);
  virtual bool send_data(List<Item> &items);
  virtual bool send_eof();
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#ifdef EMBEDDED_LIBRARY
  void begin_dataset()
  {
    protocol.begin_dataset();
  }
#endif
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};

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/****************************************************************************/

/**
  @class Prepared_statement
  @brief Prepared_statement: a statement that can contain placeholders
*/
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class Prepared_statement: public Statement
{
public:
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  enum flag_values
  {
    IS_IN_USE= 1
  };

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  THD *thd;
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  Select_fetch_protocol_prep result;
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  Protocol *protocol;
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  Item_param **param_array;
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  uint param_count;
  uint last_errno;
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  uint flags;
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  char last_error[MYSQL_ERRMSG_SIZE];
#ifndef EMBEDDED_LIBRARY
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  bool (*set_params)(Prepared_statement *st, uchar *data, uchar *data_end,
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                     uchar *read_pos, String *expanded_query);
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#else
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  bool (*set_params_data)(Prepared_statement *st, String *expanded_query);
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#endif
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  bool (*set_params_from_vars)(Prepared_statement *stmt,
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                               List<LEX_STRING>& varnames,
                               String *expanded_query);
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public:
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  Prepared_statement(THD *thd_arg, Protocol *protocol_arg);
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  virtual ~Prepared_statement();
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  void setup_set_params();
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  virtual Query_arena::Type type() const;
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  virtual void cleanup_stmt();
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  bool set_name(LEX_STRING *name);
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  inline void close_cursor() { delete cursor; cursor= 0; }
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  bool prepare(const char *packet, uint packet_length);
  bool execute(String *expanded_query, bool open_cursor);
  /* Destroy this statement */
  bool deallocate();
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private:
  /**
    Store the parsed tree of a prepared statement here.
  */
  LEX main_lex;
  /**
    The memory root to allocate parsed tree elements (instances of Item,
    SELECT_LEX and other classes).
  */
  MEM_ROOT main_mem_root;
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};
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/******************************************************************************
  Implementation
******************************************************************************/
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inline bool is_param_null(const uchar *pos, ulong param_no)
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{
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  return pos[param_no/8] & (1 << (param_no & 7));
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}

/*
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  Find a prepared statement in the statement map by id.

  SYNOPSIS
    find_prepared_statement()
      thd                thread handle
      id                 statement id
      where              the place from which this function is called (for
                         error reporting).

  DESCRIPTION
    Try to find a prepared statement and set THD error if it's not found.

  RETURN VALUE
    0 if the statement was not found, a pointer otherwise.
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*/

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static Prepared_statement *
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find_prepared_statement(THD *thd, ulong id, const char *where)
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{
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  /*
    To strictly separate namespaces of SQL prepared statements and C API
    prepared statements find() will return 0 if there is a named prepared
    statement with such id.
  */
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  Statement *stmt= thd->stmt_map.find(id);

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  if (stmt == 0 || stmt->type() != Query_arena::PREPARED_STATEMENT)
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  {
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    char llbuf[22];
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    my_error(ER_UNKNOWN_STMT_HANDLER, MYF(0), sizeof(llbuf), llstr(id, llbuf),
             where);
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    return 0;
  }
  return (Prepared_statement *) stmt;
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}

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/*
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  Send prepared statement id and metadata to the client after prepare.

  SYNOPSIS
    send_prep_stmt()

  RETURN VALUE
    0 in case of success, 1 otherwise
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*/

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#ifndef EMBEDDED_LIBRARY
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static bool send_prep_stmt(Prepared_statement *stmt, uint columns)
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{
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  NET *net= &stmt->thd->net;
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  char buff[12];
  uint tmp;
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  DBUG_ENTER("send_prep_stmt");

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  buff[0]= 0;                                   /* OK packet indicator */
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  int4store(buff+1, stmt->id);
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  int2store(buff+5, columns);
  int2store(buff+7, stmt->param_count);
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  buff[9]= 0;                                   // Guard against a 4.1 client
  tmp= min(stmt->thd->total_warn_count, 65535);
  int2store(buff+10, tmp);

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  /*
    Send types and names of placeholders to the client
    XXX: fix this nasty upcast from List<Item_param> to List<Item>
  */
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  DBUG_RETURN(my_net_write(net, buff, sizeof(buff)) ||
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              (stmt->param_count &&
               stmt->thd->protocol_simple.send_fields((List<Item> *)
                                                      &stmt->lex->param_list,
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                                                      Protocol::SEND_EOF)));
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}
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#else
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static bool send_prep_stmt(Prepared_statement *stmt,
                           uint columns __attribute__((unused)))
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{
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  THD *thd= stmt->thd;

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  thd->client_stmt_id= stmt->id;
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  thd->client_param_count= stmt->param_count;
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  thd->clear_error();
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  return 0;
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}
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#endif /*!EMBEDDED_LIBRARY*/
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/*
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  Read the length of the parameter data and return it back to
  the caller.

  SYNOPSIS
    get_param_length()
      packet             a pointer to the data
      len                remaining packet length

  DESCRIPTION
    Read data length, position the packet to the first byte after it,
    and return the length to the caller.

  RETURN VALUE
    Length of data piece.
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*/

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#ifndef EMBEDDED_LIBRARY
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static ulong get_param_length(uchar **packet, ulong len)
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{
  reg1 uchar *pos= *packet;
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  if (len < 1)
    return 0;
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  if (*pos < 251)
  {
    (*packet)++;
    return (ulong) *pos;
  }
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  if (len < 3)
    return 0;
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  if (*pos == 252)
  {
    (*packet)+=3;
    return (ulong) uint2korr(pos+1);
  }
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  if (len < 4)
    return 0;
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  if (*pos == 253)
  {
    (*packet)+=4;
    return (ulong) uint3korr(pos+1);
  }
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  if (len < 5)
    return 0;
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  (*packet)+=9; // Must be 254 when here
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  /*
    In our client-server protocol all numbers bigger than 2^24
    stored as 8 bytes with uint8korr. Here we always know that
    parameter length is less than 2^4 so don't look at the second
    4 bytes. But still we need to obey the protocol hence 9 in the
    assignment above.
  */
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  return (ulong) uint4korr(pos+1);
}
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#else
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#define get_param_length(packet, len) len
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#endif /*!EMBEDDED_LIBRARY*/

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 /*
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   Data conversion routines.

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   SYNOPSIS
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     set_param_xx()
       param             parameter item
       pos               input data buffer
       len               length of data in the buffer
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  DESCRIPTION
    All these functions read the data from pos, convert it to requested
    type and assign to param; pos is advanced to predefined length.
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    Make a note that the NULL handling is examined at first execution
    (i.e. when input types altered) and for all subsequent executions
    we don't read any values for this.
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  RETURN VALUE
    none
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*/

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static void set_param_tiny(Item_param *param, uchar **pos, ulong len)
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{
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#ifndef EMBEDDED_LIBRARY
  if (len < 1)
    return;
#endif
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  int8 value= (int8) **pos;
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  param->set_int(param->unsigned_flag ? (longlong) ((uint8) value) :
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                                        (longlong) value, 4);
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  *pos+= 1;
}

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static void set_param_short(Item_param *param, uchar **pos, ulong len)
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{
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  int16 value;
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#ifndef EMBEDDED_LIBRARY
  if (len < 2)
    return;
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  value= sint2korr(*pos);
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#else
  shortget(value, *pos);
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#endif
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  param->set_int(param->unsigned_flag ? (longlong) ((uint16) value) :
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                                        (longlong) value, 6);
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  *pos+= 2;
}

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static void set_param_int32(Item_param *param, uchar **pos, ulong len)
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{
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  int32 value;
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#ifndef EMBEDDED_LIBRARY
  if (len < 4)
    return;
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  value= sint4korr(*pos);
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#else
  longget(value, *pos);
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#endif
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  param->set_int(param->unsigned_flag ? (longlong) ((uint32) value) :
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                                        (longlong) value, 11);
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  *pos+= 4;
}

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static void set_param_int64(Item_param *param, uchar **pos, ulong len)
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{
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  longlong value;
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#ifndef EMBEDDED_LIBRARY
  if (len < 8)
    return;
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  value= (longlong) sint8korr(*pos);
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#else
  longlongget(value, *pos);
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#endif
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  param->set_int(value, 21);
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  *pos+= 8;
}

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static void set_param_float(Item_param *param, uchar **pos, ulong len)
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{
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  float data;
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#ifndef EMBEDDED_LIBRARY
  if (len < 4)
    return;
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  float4get(data,*pos);
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#else
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  floatget(data, *pos);
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#endif
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  param->set_double((double) data);
  *pos+= 4;
}

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static void set_param_double(Item_param *param, uchar **pos, ulong len)
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{
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  double data;
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#ifndef EMBEDDED_LIBRARY
  if (len < 8)
    return;
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  float8get(data,*pos);
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#else
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  doubleget(data, *pos);
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#endif
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  param->set_double((double) data);
  *pos+= 8;
}

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static void set_param_decimal(Item_param *param, uchar **pos, ulong len)
{
  ulong length= get_param_length(pos, len);
  param->set_decimal((char*)*pos, length);
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  *pos+= length;
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}

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#ifndef EMBEDDED_LIBRARY
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/*
  Read date/time/datetime parameter values from network (binary
  protocol). See writing counterparts of these functions in
  libmysql.c (store_param_{time,date,datetime}).
*/

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static void set_param_time(Item_param *param, uchar **pos, ulong len)
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{
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  MYSQL_TIME tm;
  ulong length= get_param_length(pos, len);
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  if (length >= 8)
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  {
    uchar *to= *pos;
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    uint day;
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    tm.neg= (bool) to[0];
    day= (uint) sint4korr(to+1);
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    tm.hour=   (uint) to[5] + day * 24;
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    tm.minute= (uint) to[6];
    tm.second= (uint) to[7];
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    tm.second_part= (length > 8) ? (ulong) sint4korr(to+8) : 0;
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    if (tm.hour > 838)
    {
      /* TODO: add warning 'Data truncated' here */
      tm.hour= 838;
      tm.minute= 59;
      tm.second= 59;
    }
    tm.day= tm.year= tm.month= 0;
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  }
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  else
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    set_zero_time(&tm, MYSQL_TIMESTAMP_TIME);
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  param->set_time(&tm, MYSQL_TIMESTAMP_TIME,
                  MAX_TIME_WIDTH * MY_CHARSET_BIN_MB_MAXLEN);
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  *pos+= length;
}

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static void set_param_datetime(Item_param *param, uchar **pos, ulong len)
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{
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  MYSQL_TIME tm;
  ulong length= get_param_length(pos, len);
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  if (length >= 4)
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  {
    uchar *to= *pos;
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    tm.neg=    0;
    tm.year=   (uint) sint2korr(to);
    tm.month=  (uint) to[2];
    tm.day=    (uint) to[3];
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    if (length > 4)
    {
      tm.hour=   (uint) to[4];
      tm.minute= (uint) to[5];
      tm.second= (uint) to[6];
    }
    else
      tm.hour= tm.minute= tm.second= 0;

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    tm.second_part= (length > 7) ? (ulong) sint4korr(to+7) : 0;
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  }
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  else
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    set_zero_time(&tm, MYSQL_TIMESTAMP_DATETIME);
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  param->set_time(&tm, MYSQL_TIMESTAMP_DATETIME,
                  MAX_DATETIME_WIDTH * MY_CHARSET_BIN_MB_MAXLEN);
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  *pos+= length;
}

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static void set_param_date(Item_param *param, uchar **pos, ulong len)
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{
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  MYSQL_TIME tm;
  ulong length= get_param_length(pos, len);

  if (length >= 4)
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  {
    uchar *to= *pos;
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    tm.year=  (uint) sint2korr(to);
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    tm.month=  (uint) to[2];
    tm.day= (uint) to[3];

    tm.hour= tm.minute= tm.second= 0;
    tm.second_part= 0;
    tm.neg= 0;
  }
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  else
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    set_zero_time(&tm, MYSQL_TIMESTAMP_DATE);
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  param->set_time(&tm, MYSQL_TIMESTAMP_DATE,
                  MAX_DATE_WIDTH * MY_CHARSET_BIN_MB_MAXLEN);
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  *pos+= length;
}

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#else/*!EMBEDDED_LIBRARY*/
void set_param_time(Item_param *param, uchar **pos, ulong len)
{
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  MYSQL_TIME tm= *((MYSQL_TIME*)*pos);
  tm.hour+= tm.day * 24;
  tm.day= tm.year= tm.month= 0;
  if (tm.hour > 838)
  {
    /* TODO: add warning 'Data truncated' here */
    tm.hour= 838;
    tm.minute= 59;
    tm.second= 59;
  }
  param->set_time(&tm, MYSQL_TIMESTAMP_TIME,
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                  MAX_TIME_WIDTH * MY_CHARSET_BIN_MB_MAXLEN);
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}

void set_param_datetime(Item_param *param, uchar **pos, ulong len)
{
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  MYSQL_TIME tm= *((MYSQL_TIME*)*pos);
  tm.neg= 0;
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  param->set_time(&tm, MYSQL_TIMESTAMP_DATETIME,
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                  MAX_DATETIME_WIDTH * MY_CHARSET_BIN_MB_MAXLEN);
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}

void set_param_date(Item_param *param, uchar **pos, ulong len)
{
  MYSQL_TIME *to= (MYSQL_TIME*)*pos;

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  param->set_time(to, MYSQL_TIMESTAMP_DATE,
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                  MAX_DATE_WIDTH * MY_CHARSET_BIN_MB_MAXLEN);
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}
#endif /*!EMBEDDED_LIBRARY*/

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static void set_param_str(Item_param *param, uchar **pos, ulong len)
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{
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  ulong length= get_param_length(pos, len);
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  if (length > len)
    length= len;
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  param->set_str((const char *)*pos, length);
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  *pos+= length;
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}

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#undef get_param_length
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static void setup_one_conversion_function(THD *thd, Item_param *param,
                                          uchar param_type)
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{
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  switch (param_type) {
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  case MYSQL_TYPE_TINY:
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    param->set_param_func= set_param_tiny;
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    param->item_type= Item::INT_ITEM;
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    param->item_result_type= INT_RESULT;
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    break;
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  case MYSQL_TYPE_SHORT:
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    param->set_param_func= set_param_short;
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    param->item_type= Item::INT_ITEM;
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    param->item_result_type= INT_RESULT;
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    break;
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  case MYSQL_TYPE_LONG:
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    param->set_param_func= set_param_int32;
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    param->item_type= Item::INT_ITEM;
591
    param->item_result_type= INT_RESULT;
592
    break;
593
  case MYSQL_TYPE_LONGLONG:
594
    param->set_param_func= set_param_int64;
595
    param->item_type= Item::INT_ITEM;
596
    param->item_result_type= INT_RESULT;
597
    break;
598
  case MYSQL_TYPE_FLOAT:
599
    param->set_param_func= set_param_float;
600
    param->item_type= Item::REAL_ITEM;
601
    param->item_result_type= REAL_RESULT;
602
    break;
603
  case MYSQL_TYPE_DOUBLE:
604
    param->set_param_func= set_param_double;
605
    param->item_type= Item::REAL_ITEM;
606
    param->item_result_type= REAL_RESULT;
607
    break;
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  case MYSQL_TYPE_DECIMAL:
  case MYSQL_TYPE_NEWDECIMAL:
    param->set_param_func= set_param_decimal;
    param->item_type= Item::DECIMAL_ITEM;
    param->item_result_type= DECIMAL_RESULT;
    break;
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  case MYSQL_TYPE_TIME:
615
    param->set_param_func= set_param_time;
616
    param->item_type= Item::STRING_ITEM;
617
    param->item_result_type= STRING_RESULT;
618
    break;
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  case MYSQL_TYPE_DATE:
620
    param->set_param_func= set_param_date;
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    param->item_type= Item::STRING_ITEM;
622
    param->item_result_type= STRING_RESULT;
623
    break;
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  case MYSQL_TYPE_DATETIME:
  case MYSQL_TYPE_TIMESTAMP:
626
    param->set_param_func= set_param_datetime;
627
    param->item_type= Item::STRING_ITEM;
628
    param->item_result_type= STRING_RESULT;
629
    break;
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  case MYSQL_TYPE_TINY_BLOB:
  case MYSQL_TYPE_MEDIUM_BLOB:
  case MYSQL_TYPE_LONG_BLOB:
  case MYSQL_TYPE_BLOB:
634
    param->set_param_func= set_param_str;
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    param->value.cs_info.character_set_of_placeholder= &my_charset_bin;
    param->value.cs_info.character_set_client=
      thd->variables.character_set_client;
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    param->value.cs_info.final_character_set_of_str_value= &my_charset_bin;
    param->item_type= Item::STRING_ITEM;
640
    param->item_result_type= STRING_RESULT;
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    break;
  default:
    /*
      The client library ensures that we won't get any other typecodes
      except typecodes above and typecodes for string types. Marking
      label as 'default' lets us to handle malformed packets as well.
    */
    {
      CHARSET_INFO *fromcs= thd->variables.character_set_client;
      CHARSET_INFO *tocs= thd->variables.collation_connection;
      uint32 dummy_offset;

653
      param->value.cs_info.character_set_of_placeholder= fromcs;
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      param->value.cs_info.character_set_client= fromcs;

      /*
        Setup source and destination character sets so that they
        are different only if conversion is necessary: this will
        make later checks easier.
      */
      param->value.cs_info.final_character_set_of_str_value=
        String::needs_conversion(0, fromcs, tocs, &dummy_offset) ?
        tocs : fromcs;
      param->set_param_func= set_param_str;
      /*
        Exact value of max_length is not known unless data is converted to
        charset of connection, so we have to set it later.
      */
      param->item_type= Item::STRING_ITEM;
      param->item_result_type= STRING_RESULT;
    }
672
  }
673
  param->param_type= (enum enum_field_types) param_type;
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}

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676
#ifndef EMBEDDED_LIBRARY
677
/*
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  Routines to assign parameters from data supplied by the client.

  DESCRIPTION
    Update the parameter markers by reading data from the packet and
    and generate a valid query for logging.

  NOTES
    This function, along with other _withlog functions is called when one of
    binary, slow or general logs is open. Logging of prepared statements in
    all cases is performed by means of conventional queries: if parameter
    data was supplied from C API, each placeholder in the query is
    replaced with its actual value; if we're logging a [Dynamic] SQL
    prepared statement, parameter markers are replaced with variable names.
    Example:
     mysql_stmt_prepare("UPDATE t1 SET a=a*1.25 WHERE a=?")
       --> general logs gets [Prepare] UPDATE t1 SET a*1.25 WHERE a=?"
     mysql_stmt_execute(stmt);
       --> general and binary logs get
                             [Execute] UPDATE t1 SET a*1.25 WHERE a=1"
     If a statement has been prepared using SQL syntax:
     PREPARE stmt FROM "UPDATE t1 SET a=a*1.25 WHERE a=?"
       --> general log gets
                                 [Query]   PREPARE stmt FROM "UPDATE ..."
     EXECUTE stmt USING @a
       --> general log gets
                                 [Query]   EXECUTE stmt USING @a;

  RETURN VALUE
   0 if success, 1 otherwise
707 708
*/

709
static bool insert_params_withlog(Prepared_statement *stmt, uchar *null_array,
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710
                                  uchar *read_pos, uchar *data_end,
711
                                  String *query)
712
{
713 714 715 716
  THD  *thd= stmt->thd;
  Item_param **begin= stmt->param_array;
  Item_param **end= begin + stmt->param_count;
  uint32 length= 0;
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  String str;
718
  const String *res;
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  DBUG_ENTER("insert_params_withlog");
720

721
  if (query->copy(stmt->query, stmt->query_length, default_charset_info))
722
    DBUG_RETURN(1);
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723

724
  for (Item_param **it= begin; it < end; ++it)
725
  {
726
    Item_param *param= *it;
727
    if (param->state != Item_param::LONG_DATA_VALUE)
728
    {
729
      if (is_param_null(null_array, it - begin))
730
        param->set_null();
731 732
      else
      {
733 734 735
        if (read_pos >= data_end)
          DBUG_RETURN(1);
        param->set_param_func(param, &read_pos, data_end - read_pos);
736 737
        if (param->state == Item_param::NO_VALUE)
          DBUG_RETURN(1);
738 739
      }
    }
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    res= param->query_val_str(&str);
    if (param->convert_str_value(thd))
      DBUG_RETURN(1);                           /* out of memory */

744
    if (query->replace(param->pos_in_query+length, 1, *res))
745
      DBUG_RETURN(1);
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747 748 749 750 751
    length+= res->length()-1;
  }
  DBUG_RETURN(0);
}

752

753
static bool insert_params(Prepared_statement *stmt, uchar *null_array,
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754
                          uchar *read_pos, uchar *data_end,
755
                          String *expanded_query)
756
{
757 758
  Item_param **begin= stmt->param_array;
  Item_param **end= begin + stmt->param_count;
759

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760
  DBUG_ENTER("insert_params");
761

762
  for (Item_param **it= begin; it < end; ++it)
763
  {
764
    Item_param *param= *it;
765
    if (param->state != Item_param::LONG_DATA_VALUE)
766
    {
767
      if (is_param_null(null_array, it - begin))
768
        param->set_null();
769 770
      else
      {
771 772 773
        if (read_pos >= data_end)
          DBUG_RETURN(1);
        param->set_param_func(param, &read_pos, data_end - read_pos);
774 775
        if (param->state == Item_param::NO_VALUE)
          DBUG_RETURN(1);
776 777
      }
    }
778 779
    if (param->convert_str_value(stmt->thd))
      DBUG_RETURN(1);                           /* out of memory */
780 781 782 783
  }
  DBUG_RETURN(0);
}

784

785
static bool setup_conversion_functions(Prepared_statement *stmt,
786
                                       uchar **data, uchar *data_end)
787 788 789
{
  /* skip null bits */
  uchar *read_pos= *data + (stmt->param_count+7) / 8;
790

791
  DBUG_ENTER("setup_conversion_functions");
792

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793
  if (*read_pos++) //types supplied / first execute
794
  {
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    /*
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      First execute or types altered by the client, setup the
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      conversion routines for all parameters (one time)
    */
799 800
    Item_param **it= stmt->param_array;
    Item_param **end= it + stmt->param_count;
801
    THD *thd= stmt->thd;
802 803
    for (; it < end; ++it)
    {
804 805 806
      ushort typecode;
      const uint signed_bit= 1 << 15;

807 808
      if (read_pos >= data_end)
        DBUG_RETURN(1);
809 810

      typecode= sint2korr(read_pos);
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811
      read_pos+= 2;
812
      (**it).unsigned_flag= test(typecode & signed_bit);
813
      setup_one_conversion_function(thd, *it, (uchar) (typecode & ~signed_bit));
814
    }
815 816
  }
  *data= read_pos;
817 818 819
  DBUG_RETURN(0);
}

820 821
#else

822 823 824 825 826 827 828 829 830 831 832
/*
  Embedded counterparts of parameter assignment routines.

  DESCRIPTION
    The main difference between the embedded library and the server is
    that in embedded case we don't serialize/deserialize parameters data.
    Additionally, for unknown reason, the client-side flag raised for
    changed types of placeholders is ignored and we simply setup conversion
    functions at each execute (TODO: fix).
*/

833
static bool emb_insert_params(Prepared_statement *stmt, String *expanded_query)
834
{
835
  THD *thd= stmt->thd;
836 837
  Item_param **it= stmt->param_array;
  Item_param **end= it + stmt->param_count;
838 839
  MYSQL_BIND *client_param= stmt->thd->client_params;

840
  DBUG_ENTER("emb_insert_params");
841

842 843 844
  for (; it < end; ++it, ++client_param)
  {
    Item_param *param= *it;
845 846
    setup_one_conversion_function(thd, param, client_param->buffer_type);
    if (param->state != Item_param::LONG_DATA_VALUE)
847 848
    {
      if (*client_param->is_null)
849
        param->set_null();
850 851
      else
      {
852
        uchar *buff= (uchar*) client_param->buffer;
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853
        param->unsigned_flag= client_param->is_unsigned;
854
        param->set_param_func(param, &buff,
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855 856
                              client_param->length ?
                              *client_param->length :
857
                              client_param->buffer_length);
858 859
        if (param->state == Item_param::NO_VALUE)
          DBUG_RETURN(1);
860 861
      }
    }
862 863
    if (param->convert_str_value(thd))
      DBUG_RETURN(1);                           /* out of memory */
864 865 866 867
  }
  DBUG_RETURN(0);
}

868

869
static bool emb_insert_params_withlog(Prepared_statement *stmt, String *query)
870
{
871
  THD *thd= stmt->thd;
872 873
  Item_param **it= stmt->param_array;
  Item_param **end= it + stmt->param_count;
874 875
  MYSQL_BIND *client_param= thd->client_params;

876
  String str;
877
  const String *res;
878
  uint32 length= 0;
879

880
  DBUG_ENTER("emb_insert_params_withlog");
881

882
  if (query->copy(stmt->query, stmt->query_length, default_charset_info))
883
    DBUG_RETURN(1);
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884

885 886 887
  for (; it < end; ++it, ++client_param)
  {
    Item_param *param= *it;
888 889
    setup_one_conversion_function(thd, param, client_param->buffer_type);
    if (param->state != Item_param::LONG_DATA_VALUE)
890 891
    {
      if (*client_param->is_null)
892
        param->set_null();
893 894
      else
      {
895
        uchar *buff= (uchar*)client_param->buffer;
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896
        param->unsigned_flag= client_param->is_unsigned;
897
        param->set_param_func(param, &buff,
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898 899
                              client_param->length ?
                              *client_param->length :
900
                              client_param->buffer_length);
901 902
        if (param->state == Item_param::NO_VALUE)
          DBUG_RETURN(1);
903 904
      }
    }
905 906 907 908
    res= param->query_val_str(&str);
    if (param->convert_str_value(thd))
      DBUG_RETURN(1);                           /* out of memory */

909
    if (query->replace(param->pos_in_query+length, 1, *res))
910
      DBUG_RETURN(1);
911

912 913 914 915 916
    length+= res->length()-1;
  }
  DBUG_RETURN(0);
}

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917 918
#endif /*!EMBEDDED_LIBRARY*/

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919

920
/*
921 922
  Assign prepared statement parameters from user variables.

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923 924 925 926 927
  SYNOPSIS
    insert_params_from_vars()
      stmt      Statement
      varnames  List of variables. Caller must ensure that number of variables
                in the list is equal to number of statement parameters
928
      query     Ignored
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929 930
*/

931 932
static bool insert_params_from_vars(Prepared_statement *stmt,
                                    List<LEX_STRING>& varnames,
933
                                    String *query __attribute__((unused)))
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934 935 936 937 938 939
{
  Item_param **begin= stmt->param_array;
  Item_param **end= begin + stmt->param_count;
  user_var_entry *entry;
  LEX_STRING *varname;
  List_iterator<LEX_STRING> var_it(varnames);
940 941
  DBUG_ENTER("insert_params_from_vars");

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942 943 944 945
  for (Item_param **it= begin; it < end; ++it)
  {
    Item_param *param= *it;
    varname= var_it++;
946 947 948 949 950 951
    entry= (user_var_entry*)hash_search(&stmt->thd->user_vars,
                                        (byte*) varname->str,
                                         varname->length);
    if (param->set_from_user_var(stmt->thd, entry) ||
        param->convert_str_value(stmt->thd))
      DBUG_RETURN(1);
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952 953 954 955
  }
  DBUG_RETURN(0);
}

956

957
/*
958 959
  Do the same as insert_params_from_vars but also construct query text for
  binary log.
960

961 962
  SYNOPSIS
    insert_params_from_vars()
963
      stmt      Prepared statement
964 965
      varnames  List of variables. Caller must ensure that number of variables
                in the list is equal to number of statement parameters
966 967
      query     The query with parameter markers replaced with corresponding
                user variables that were used to execute the query.
968 969
*/

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970
static bool insert_params_from_vars_with_log(Prepared_statement *stmt,
971
                                             List<LEX_STRING>& varnames,
972
                                             String *query)
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973 974 975 976 977 978
{
  Item_param **begin= stmt->param_array;
  Item_param **end= begin + stmt->param_count;
  user_var_entry *entry;
  LEX_STRING *varname;
  List_iterator<LEX_STRING> var_it(varnames);
979 980
  String buf;
  const String *val;
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981
  uint32 length= 0;
982
  THD *thd= stmt->thd;
983 984 985

  DBUG_ENTER("insert_params_from_vars");

986
  if (query->copy(stmt->query, stmt->query_length, default_charset_info))
987
    DBUG_RETURN(1);
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988 989 990 991 992 993

  for (Item_param **it= begin; it < end; ++it)
  {
    Item_param *param= *it;
    varname= var_it++;

994 995 996 997 998 999 1000 1001 1002
    entry= (user_var_entry *) hash_search(&thd->user_vars, (byte*) varname->str,
                                          varname->length);
    /*
      We have to call the setup_one_conversion_function() here to set
      the parameter's members that might be needed further
      (e.g. value.cs_info.character_set_client is used in the query_val_str()).
    */
    setup_one_conversion_function(thd, param, param->param_type);
    if (param->set_from_user_var(thd, entry))
1003
      DBUG_RETURN(1);
1004
    val= param->query_val_str(&buf);
1005

1006
    if (param->convert_str_value(thd))
1007
      DBUG_RETURN(1);                           /* out of memory */
1008

1009
    if (query->replace(param->pos_in_query+length, 1, *val))
1010
      DBUG_RETURN(1);
1011
    length+= val->length()-1;
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1012 1013 1014 1015
  }
  DBUG_RETURN(0);
}

1016
/*
1017
  Validate INSERT statement.
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1018

1019
  SYNOPSIS
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1020
    mysql_test_insert()
1021 1022
      stmt               prepared statement
      tables             global/local table list
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1023

1024
  RETURN VALUE
1025 1026
    FALSE                success
    TRUE                 error, error message is set in THD
1027
*/
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1028

1029 1030
static bool mysql_test_insert(Prepared_statement *stmt,
                              TABLE_LIST *table_list,
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1031
                              List<Item> &fields,
1032 1033 1034 1035
                              List<List_item> &values_list,
                              List<Item> &update_fields,
                              List<Item> &update_values,
                              enum_duplicates duplic)
1036
{
1037
  THD *thd= stmt->thd;
1038 1039
  List_iterator_fast<List_item> its(values_list);
  List_item *values;
1040
  DBUG_ENTER("mysql_test_insert");
1041

1042 1043
  if (insert_precheck(thd, table_list))
    goto error;
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1044

1045
  /*
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1046 1047 1048 1049 1050 1051
    open temporary memory pool for temporary data allocated by derived
    tables & preparation procedure
    Note that this is done without locks (should not be needed as we will not
    access any data here)
    If we would use locks, then we have to ensure we are not using
    TL_WRITE_DELAYED as having two such locks can cause table corruption.
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1052
  */
1053
  if (open_normal_and_derived_tables(thd, table_list, 0))
1054
    goto error;
1055

1056 1057 1058
  if ((values= its++))
  {
    uint value_count;
1059
    ulong counter= 0;
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1060
    Item *unused_conds= 0;
1061

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1062
    if (table_list->table)
1063 1064 1065 1066 1067
    {
      // don't allocate insert_values
      table_list->table->insert_values=(byte *)1;
    }

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1068 1069
    if (mysql_prepare_insert(thd, table_list, table_list->table,
                             fields, values, update_fields, update_values,
1070
                             duplic, &unused_conds, FALSE, FALSE, FALSE))
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1071
      goto error;
1072

1073 1074
    value_count= values->elements;
    its.rewind();
1075

1076 1077 1078 1079 1080
    if (table_list->lock_type == TL_WRITE_DELAYED &&
        !(table_list->table->file->table_flags() & HA_CAN_INSERT_DELAYED))
    {
      my_error(ER_ILLEGAL_HA, MYF(0), (table_list->view ?
                                       table_list->view_name.str :
1081
                                       table_list->table_name));
1082 1083
      goto error;
    }
1084
    while ((values= its++))
1085 1086 1087 1088
    {
      counter++;
      if (values->elements != value_count)
      {
1089
        my_error(ER_WRONG_VALUE_COUNT_ON_ROW, MYF(0), counter);
1090
        goto error;
1091
      }
1092
      if (setup_fields(thd, 0, *values, 0, 0, 0))
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1093
        goto error;
1094 1095
    }
  }
1096
  DBUG_RETURN(FALSE);
1097 1098

error:
1099
  /* insert_values is cleared in open_table */
1100
  DBUG_RETURN(TRUE);
1101 1102 1103 1104
}


/*
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1105 1106
  Validate UPDATE statement

1107
  SYNOPSIS
1108
    mysql_test_update()
1109 1110
      stmt               prepared statement
      tables             list of tables used in this query
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1111

1112
  RETURN VALUE
1113 1114 1115
    0                    success
    1                    error, error message is set in THD
    2                    convert to multi_update
1116
*/
1117

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1118
static int mysql_test_update(Prepared_statement *stmt,
1119
                              TABLE_LIST *table_list)
1120
{
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1121
  int res;
1122
  THD *thd= stmt->thd;
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1123
  uint table_count= 0;
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1124
  SELECT_LEX *select= &stmt->lex->select_lex;
1125
#ifndef NO_EMBEDDED_ACCESS_CHECKS
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1126
  uint          want_privilege;
1127
#endif
1128
  bool need_reopen;
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1129 1130
  DBUG_ENTER("mysql_test_update");

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merge  
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1131
  if (update_precheck(thd, table_list))
1132 1133
    goto error;

1134
  for ( ; ; )
1135
  {
1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152
    if (open_tables(thd, &table_list, &table_count, 0))
      goto error;

    if (table_list->multitable_view)
    {
      DBUG_ASSERT(table_list->view != 0);
      DBUG_PRINT("info", ("Switch to multi-update"));
      /* pass counter value */
      thd->lex->table_count= table_count;
      /* convert to multiupdate */
      DBUG_RETURN(2);
    }

    if (!lock_tables(thd, table_list, table_count, &need_reopen))
      break;
    if (!need_reopen)
      goto error;
1153
    close_tables_for_reopen(thd, &table_list);
1154
  }
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1155

1156 1157 1158 1159
  /*
    thd->fill_derived_tables() is false here for sure (because it is
    preparation of PS, so we even do not check it).
  */
1160
  if (mysql_handle_derived(thd->lex, &mysql_derived_prepare))
1161
    goto error;
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1162

1163
#ifndef NO_EMBEDDED_ACCESS_CHECKS
1164 1165 1166
  /* Force privilege re-checking for views after they have been opened. */
  want_privilege= (table_list->view ? UPDATE_ACL :
                   table_list->grant.want_privilege);
1167 1168
#endif

1169 1170 1171 1172 1173
  if (mysql_prepare_update(thd, table_list, &select->where,
                           select->order_list.elements,
                           (ORDER *) select->order_list.first))
    goto error;

1174
#ifndef NO_EMBEDDED_ACCESS_CHECKS
1175 1176
  table_list->grant.want_privilege= want_privilege;
  table_list->table->grant.want_privilege= want_privilege;
1177
  table_list->register_want_access(want_privilege);
1178
#endif
1179 1180 1181
  thd->lex->select_lex.no_wrap_view_item= TRUE;
  res= setup_fields(thd, 0, select->item_list, 1, 0, 0);
  thd->lex->select_lex.no_wrap_view_item= FALSE;
1182 1183
  if (res)
    goto error;
1184
#ifndef NO_EMBEDDED_ACCESS_CHECKS
1185 1186 1187 1188
  /* Check values */
  table_list->grant.want_privilege=
  table_list->table->grant.want_privilege=
    (SELECT_ACL & ~table_list->table->grant.privilege);
1189
  table_list->register_want_access(SELECT_ACL);
1190
#endif
1191
  if (setup_fields(thd, 0, stmt->lex->value_list, 0, 0, 0))
1192
    goto error;
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1193
  /* TODO: here we should send types of placeholders to the client. */
1194 1195 1196
  DBUG_RETURN(0);
error:
  DBUG_RETURN(1);
1197 1198 1199 1200
}


/*
1201
  Validate DELETE statement.
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1202

1203
  SYNOPSIS
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1204
    mysql_test_delete()
1205 1206
      stmt               prepared statement
      tables             list of tables used in this query
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1207

1208
  RETURN VALUE
1209 1210
    FALSE                success
    TRUE                 error, error message is set in THD
1211
*/
1212 1213 1214

static bool mysql_test_delete(Prepared_statement *stmt,
                              TABLE_LIST *table_list)
1215
{
1216
  THD *thd= stmt->thd;
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1217 1218
  LEX *lex= stmt->lex;
  DBUG_ENTER("mysql_test_delete");
1219

1220 1221 1222
  if (delete_precheck(thd, table_list) ||
      open_and_lock_tables(thd, table_list))
    goto error;
1223

1224
  if (!table_list->table)
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1225
  {
1226 1227 1228
    my_error(ER_VIEW_DELETE_MERGE_VIEW, MYF(0),
             table_list->view_db.str, table_list->view_name.str);
    goto error;
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1229
  }
1230 1231 1232

  DBUG_RETURN(mysql_prepare_delete(thd, table_list, &lex->select_lex.where));
error:
1233
  DBUG_RETURN(TRUE);
1234 1235
}

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1236

1237
/*
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1238 1239
  Validate SELECT statement.

1240
  SYNOPSIS
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1241
    mysql_test_select()
1242 1243 1244 1245 1246 1247
      stmt               prepared statement
      tables             list of tables used in the query

  DESCRIPTION
    In case of success, if this query is not EXPLAIN, send column list info
    back to the client.
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1248

1249
  RETURN VALUE
1250 1251 1252
    0                    success
    1                    error, error message is set in THD
    2                    success, and statement metadata has been sent
1253
*/
1254

1255 1256
static int mysql_test_select(Prepared_statement *stmt,
                             TABLE_LIST *tables, bool text_protocol)
1257
{
1258
  THD *thd= stmt->thd;
1259
  LEX *lex= stmt->lex;
1260
  SELECT_LEX_UNIT *unit= &lex->unit;
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1261
  DBUG_ENTER("mysql_test_select");
1262

1263 1264
  lex->select_lex.context.resolve_in_select_list= TRUE;

1265 1266 1267
  ulong privilege= lex->exchange ? SELECT_ACL | FILE_ACL : SELECT_ACL;
  if (tables)
  {
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1268
    if (check_table_access(thd, privilege, tables,0))
1269
      goto error;
1270
  }
1271
  else if (check_access(thd, privilege, any_db,0,0,0,0))
1272
    goto error;
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1273

1274
  if (!lex->result && !(lex->result= new (stmt->mem_root) select_send))
1275 1276 1277 1278
  {
    my_error(ER_OUTOFMEMORY, MYF(0), sizeof(select_send));
    goto error;
  }
1279

1280
  if (open_and_lock_tables(thd, tables))
1281
    goto error;
1282

1283 1284
  thd->used_tables= 0;                        // Updated by setup_fields

1285 1286 1287 1288 1289
  /*
    JOIN::prepare calls
    It is not SELECT COMMAND for sure, so setup_tables will be called as
    usual, and we pass 0 as setup_tables_done_option
  */
1290
  if (unit->prepare(thd, 0, 0))
1291
    goto error;
1292
  if (!lex->describe && !text_protocol)
1293
  {
1294 1295
    /* Make copy of item list, as change_columns may change it */
    List<Item> fields(lex->select_lex.item_list);
1296

1297 1298 1299
    /* Change columns if a procedure like analyse() */
    if (unit->last_procedure && unit->last_procedure->change_columns(fields))
      goto error;
1300

1301 1302 1303 1304 1305 1306 1307 1308 1309
    /*
      We can use lex->result as it should've been prepared in
      unit->prepare call above.
    */
    if (send_prep_stmt(stmt, lex->result->field_count(fields)) ||
        lex->result->send_fields(fields, Protocol::SEND_EOF) ||
        thd->protocol->flush())
      goto error;
    DBUG_RETURN(2);
1310
  }
1311
  DBUG_RETURN(0);
1312
error:
1313
  DBUG_RETURN(1);
1314 1315
}

1316

1317
/*
1318
  Validate and prepare for execution DO statement expressions.
1319 1320 1321

  SYNOPSIS
    mysql_test_do_fields()
1322 1323 1324
      stmt               prepared statement
      tables             list of tables used in this query
      values             list of expressions
1325 1326

  RETURN VALUE
1327 1328
    FALSE                success
    TRUE                 error, error message is set in THD
1329 1330
*/

1331
static bool mysql_test_do_fields(Prepared_statement *stmt,
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1332 1333
                                TABLE_LIST *tables,
                                List<Item> *values)
1334 1335
{
  THD *thd= stmt->thd;
1336 1337

  DBUG_ENTER("mysql_test_do_fields");
1338 1339
  if (tables && check_table_access(thd, SELECT_ACL, tables, 0))
    DBUG_RETURN(TRUE);
1340

1341
  if (open_and_lock_tables(thd, tables))
1342
    DBUG_RETURN(TRUE);
1343
  DBUG_RETURN(setup_fields(thd, 0, *values, 0, 0, 0));
1344 1345 1346 1347 1348 1349 1350 1351
}


/*
  Validate and prepare for execution SET statement expressions

  SYNOPSIS
    mysql_test_set_fields()
1352 1353 1354
      stmt               prepared statement
      tables             list of tables used in this query
      values             list of expressions
1355 1356

  RETURN VALUE
1357 1358
    FALSE                success
    TRUE                 error, error message is set in THD
1359
*/
1360

1361 1362 1363
static bool mysql_test_set_fields(Prepared_statement *stmt,
                                  TABLE_LIST *tables,
                                  List<set_var_base> *var_list)
1364 1365 1366 1367 1368
{
  DBUG_ENTER("mysql_test_set_fields");
  List_iterator_fast<set_var_base> it(*var_list);
  THD *thd= stmt->thd;
  set_var_base *var;
1369

1370 1371
  if (tables && check_table_access(thd, SELECT_ACL, tables, 0) ||
      open_and_lock_tables(thd, tables))
1372
    goto error;
1373

1374 1375 1376 1377 1378
  while ((var= it++))
  {
    if (var->light_check(thd))
      goto error;
  }
1379
  DBUG_RETURN(FALSE);
1380
error:
1381
  DBUG_RETURN(TRUE);
1382 1383 1384 1385 1386 1387 1388
}


/*
  Check internal SELECT of the prepared command

  SYNOPSIS
1389
    select_like_stmt_test()
1390 1391 1392
      stmt                      prepared statement
      specific_prepare          function of command specific prepare
      setup_tables_done_option  options to be passed to LEX::unit.prepare()
1393 1394 1395 1396 1397 1398

  NOTE
    This function won't directly open tables used in select. They should
    be opened either by calling function (and in this case you probably
    should use select_like_stmt_test_with_open_n_lock()) or by
    "specific_prepare" call (like this happens in case of multi-update).
1399

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1400
  RETURN VALUE
1401 1402
    FALSE                success
    TRUE                 error, error message is set in THD
1403
*/
1404 1405 1406 1407

static bool select_like_stmt_test(Prepared_statement *stmt,
                                  bool (*specific_prepare)(THD *thd),
                                  ulong setup_tables_done_option)
1408
{
1409
  DBUG_ENTER("select_like_stmt_test");
1410 1411 1412
  THD *thd= stmt->thd;
  LEX *lex= stmt->lex;

1413 1414
  lex->select_lex.context.resolve_in_select_list= TRUE;

1415 1416
  if (specific_prepare && (*specific_prepare)(thd))
    DBUG_RETURN(TRUE);
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1417

1418 1419
  thd->used_tables= 0;                        // Updated by setup_fields

1420
  /* Calls JOIN::prepare */
1421
  DBUG_RETURN(lex->unit.prepare(thd, 0, setup_tables_done_option));
1422 1423
}

1424 1425
/*
  Check internal SELECT of the prepared command (with opening and
1426
  locking of used tables).
1427 1428 1429

  SYNOPSIS
    select_like_stmt_test_with_open_n_lock()
1430 1431 1432 1433 1434
      stmt                      prepared statement
      tables                    list of tables to be opened and locked
                                before calling specific_prepare function
      specific_prepare          function of command specific prepare
      setup_tables_done_option  options to be passed to LEX::unit.prepare()
1435 1436

  RETURN VALUE
1437 1438
    FALSE                success
    TRUE                 error
1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461
*/

static bool
select_like_stmt_test_with_open_n_lock(Prepared_statement *stmt,
                                       TABLE_LIST *tables,
                                       bool (*specific_prepare)(THD *thd),
                                       ulong setup_tables_done_option)
{
  DBUG_ENTER("select_like_stmt_test_with_open_n_lock");

  /*
    We should not call LEX::unit.cleanup() after this open_and_lock_tables()
    call because we don't allow prepared EXPLAIN yet so derived tables will
    clean up after themself.
  */
  if (open_and_lock_tables(stmt->thd, tables))
    DBUG_RETURN(TRUE);

  DBUG_RETURN(select_like_stmt_test(stmt, specific_prepare,
                                    setup_tables_done_option));
}


1462
/*
1463
  Validate and prepare for execution CREATE TABLE statement
1464 1465 1466

  SYNOPSIS
    mysql_test_create_table()
1467 1468
      stmt               prepared statement
      tables             list of tables used in this query
1469 1470

  RETURN VALUE
1471 1472
    FALSE                success
    TRUE                 error, error message is set in THD
1473
*/
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1474

1475
static bool mysql_test_create_table(Prepared_statement *stmt)
1476 1477 1478 1479
{
  DBUG_ENTER("mysql_test_create_table");
  THD *thd= stmt->thd;
  LEX *lex= stmt->lex;
1480
  SELECT_LEX *select_lex= &lex->select_lex;
1481
  bool res= FALSE;
1482
  /* Skip first table, which is the table we are creating */
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1483 1484 1485
  bool link_to_local;
  TABLE_LIST *create_table= lex->unlink_first_table(&link_to_local);
  TABLE_LIST *tables= lex->query_tables;
1486

1487 1488 1489 1490
  if (create_table_precheck(thd, tables, create_table))
    DBUG_RETURN(TRUE);

  if (select_lex->item_list.elements)
1491
  {
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1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503
    if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE))
    {
      lex->link_first_table_back(create_table, link_to_local);
      create_table->create= TRUE;
    }

    if (open_and_lock_tables(stmt->thd, lex->query_tables))
      DBUG_RETURN(TRUE);

    if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE))
      create_table= lex->unlink_first_table(&link_to_local);

1504
    select_lex->context.resolve_in_select_list= TRUE;
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1505 1506

    res= select_like_stmt_test(stmt, 0, 0);
1507
  }
1508

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1509
  /* put tables back for PS rexecuting */
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VIEW  
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1510
  lex->link_first_table_back(create_table, link_to_local);
1511 1512 1513
  DBUG_RETURN(res);
}

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1514

1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552
/**
  @brief Validate and prepare for execution CREATE VIEW statement

  @param stmt prepared statement

  @note This function handles create view commands.

  @retval FALSE Operation was a success.
  @retval TRUE An error occured.
*/

static bool mysql_test_create_view(Prepared_statement *stmt)
{
  DBUG_ENTER("mysql_test_create_view");
  THD *thd= stmt->thd;
  LEX *lex= stmt->lex;
  bool res= TRUE;
  /* Skip first table, which is the view we are creating */
  bool link_to_local;
  TABLE_LIST *view= lex->unlink_first_table(&link_to_local);
  TABLE_LIST *tables= lex->query_tables;

  if (create_view_precheck(thd, tables, view, lex->create_view_mode))
    goto err;

  if (open_normal_and_derived_tables(thd, tables, 0))
    goto err;

  lex->view_prepare_mode= 1;
  res= select_like_stmt_test(stmt, 0, 0);

err:
  /* put view back for PS rexecuting */
  lex->link_first_table_back(view, link_to_local);
  DBUG_RETURN(res);
}


1553
/*
1554
  Validate and prepare for execution a multi update statement.
1555 1556 1557

  SYNOPSIS
    mysql_test_multiupdate()
1558 1559 1560
      stmt               prepared statement
      tables             list of tables used in this query
      converted          converted to multi-update from usual update
1561 1562

  RETURN VALUE
1563 1564
    FALSE                success
    TRUE                 error, error message is set in THD
1565
*/
1566 1567

static bool mysql_test_multiupdate(Prepared_statement *stmt,
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1568
                                  TABLE_LIST *tables,
1569
                                  bool converted)
1570
{
1571
  /* if we switched from normal update, rights are checked */
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1572
  if (!converted && multi_update_precheck(stmt->thd, tables))
1573
    return TRUE;
1574 1575 1576

  return select_like_stmt_test(stmt, &mysql_multi_update_prepare,
                               OPTION_SETUP_TABLES_DONE);
1577 1578 1579 1580
}


/*
1581
  Validate and prepare for execution a multi delete statement.
1582 1583 1584

  SYNOPSIS
    mysql_test_multidelete()
1585 1586
      stmt               prepared statement
      tables             list of tables used in this query
1587 1588

  RETURN VALUE
1589 1590
    FALSE                success
    TRUE                 error, error message in THD is set.
1591
*/
1592 1593

static bool mysql_test_multidelete(Prepared_statement *stmt,
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1594
                                  TABLE_LIST *tables)
1595 1596 1597
{
  stmt->thd->lex->current_select= &stmt->thd->lex->select_lex;
  if (add_item_to_list(stmt->thd, new Item_null()))
1598 1599 1600 1601
  {
    my_error(ER_OUTOFMEMORY, MYF(0), 0);
    goto error;
  }
1602

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1603
  if (multi_delete_precheck(stmt->thd, tables) ||
1604 1605 1606 1607
      select_like_stmt_test_with_open_n_lock(stmt, tables,
                                             &mysql_multi_delete_prepare,
                                             OPTION_SETUP_TABLES_DONE))
    goto error;
1608 1609 1610
  if (!tables->table)
  {
    my_error(ER_VIEW_DELETE_MERGE_VIEW, MYF(0),
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1611
             tables->view_db.str, tables->view_name.str);
1612
    goto error;
1613
  }
1614 1615 1616
  return FALSE;
error:
  return TRUE;
1617 1618 1619
}


1620 1621 1622 1623 1624 1625
/*
  Wrapper for mysql_insert_select_prepare, to make change of local tables
  after open_and_lock_tables() call.

  SYNOPSIS
    mysql_insert_select_prepare_tester()
1626
      thd                thread handle
1627

1628 1629 1630
  NOTE
    We need to remove the first local table after open_and_lock_tables,
    because mysql_handle_derived uses local tables lists.
1631 1632 1633 1634 1635
*/

static bool mysql_insert_select_prepare_tester(THD *thd)
{
  SELECT_LEX *first_select= &thd->lex->select_lex;
1636 1637 1638
  TABLE_LIST *second_table= ((TABLE_LIST*)first_select->table_list.first)->
    next_local;

1639
  /* Skip first table, which is the table we are inserting in */
1640 1641 1642 1643 1644
  first_select->table_list.first= (byte *) second_table;
  thd->lex->select_lex.context.table_list=
    thd->lex->select_lex.context.first_name_resolution_table= second_table;

  return mysql_insert_select_prepare(thd);
1645 1646 1647
}


1648
/*
1649
  Validate and prepare for execution INSERT ... SELECT statement.
1650 1651 1652

  SYNOPSIS
    mysql_test_insert_select()
1653 1654
      stmt               prepared statement
      tables             list of tables used in this query
1655 1656

  RETURN VALUE
1657 1658
    FALSE                success
    TRUE                 error, error message is set in THD
1659
*/
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1660

1661 1662
static bool mysql_test_insert_select(Prepared_statement *stmt,
                                     TABLE_LIST *tables)
1663 1664 1665
{
  int res;
  LEX *lex= stmt->lex;
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1666 1667
  TABLE_LIST *first_local_table;

1668 1669 1670 1671 1672
  if (tables->table)
  {
    // don't allocate insert_values
    tables->table->insert_values=(byte *)1;
  }
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1673

1674 1675
  if (insert_precheck(stmt->thd, tables))
    return 1;
1676 1677 1678 1679 1680

  /* store it, because mysql_insert_select_prepare_tester change it */
  first_local_table= (TABLE_LIST *)lex->select_lex.table_list.first;
  DBUG_ASSERT(first_local_table != 0);

1681 1682 1683 1684
  res=
    select_like_stmt_test_with_open_n_lock(stmt, tables,
                                           &mysql_insert_select_prepare_tester,
                                           OPTION_SETUP_TABLES_DONE);
1685
  /* revert changes  made by mysql_insert_select_prepare_tester */
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1686
  lex->select_lex.table_list.first= (byte*) first_local_table;
1687 1688 1689 1690
  return res;
}


1691
/*
1692 1693 1694
  Perform semantic analysis of the parsed tree and send a response packet
  to the client.

1695
  SYNOPSIS
1696
    check_prepared_statement()
1697
      stmt               prepared statement
1698 1699 1700 1701 1702 1703 1704

  DESCRIPTION
    This function
    - opens all tables and checks access rights
    - validates semantics of statement columns and SQL functions
      by calling fix_fields.

1705
  RETURN VALUE
1706 1707
    FALSE                success, statement metadata is sent to client
    TRUE                 error, error message is set in THD (but not sent)
1708
*/
1709

1710 1711
static bool check_prepared_statement(Prepared_statement *stmt,
                                     bool text_protocol)
1712
{
1713
  THD *thd= stmt->thd;
1714
  LEX *lex= stmt->lex;
1715
  SELECT_LEX *select_lex= &lex->select_lex;
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1716
  TABLE_LIST *tables;
1717
  enum enum_sql_command sql_command= lex->sql_command;
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1718
  int res= 0;
1719
  DBUG_ENTER("check_prepared_statement");
1720
  DBUG_PRINT("enter",("command: %d  param_count: %u",
1721
                      sql_command, stmt->param_count));
1722

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1723 1724
  lex->first_lists_tables_same();
  tables= lex->query_tables;
1725

1726 1727 1728 1729
  /* set context for commands which do not use setup_tables */
  lex->select_lex.context.resolve_in_table_list_only(select_lex->
                                                     get_table_list());

1730
  switch (sql_command) {
1731
  case SQLCOM_REPLACE:
1732
  case SQLCOM_INSERT:
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1733
    res= mysql_test_insert(stmt, tables, lex->field_list,
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1734
                           lex->many_values,
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1735
                           lex->update_list, lex->value_list,
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1736
                           lex->duplicates);
1737 1738 1739
    break;

  case SQLCOM_UPDATE:
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1740
    res= mysql_test_update(stmt, tables);
1741
    /* mysql_test_update returns 2 if we need to switch to multi-update */
1742 1743 1744 1745 1746
    if (res != 2)
      break;

  case SQLCOM_UPDATE_MULTI:
    res= mysql_test_multiupdate(stmt, tables, res == 2);
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1747 1748
    break;

1749
  case SQLCOM_DELETE:
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1750
    res= mysql_test_delete(stmt, tables);
1751 1752 1753
    break;

  case SQLCOM_SELECT:
1754 1755 1756 1757 1758 1759 1760
    res= mysql_test_select(stmt, tables, text_protocol);
    if (res == 2)
    {
      /* Statement and field info has already been sent */
      DBUG_RETURN(FALSE);
    }
    break;
1761
  case SQLCOM_CREATE_TABLE:
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    res= mysql_test_create_table(stmt);
1763
    break;
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1764

1765 1766 1767 1768 1769 1770
  case SQLCOM_CREATE_VIEW:
    if (lex->create_view_mode == VIEW_ALTER)
    {
      my_message(ER_UNSUPPORTED_PS, ER(ER_UNSUPPORTED_PS), MYF(0));
      goto error;
    }
1771
    res= mysql_test_create_view(stmt);
1772
    break;
1773
  case SQLCOM_DO:
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1774 1775
    res= mysql_test_do_fields(stmt, tables, lex->insert_list);
    break;
1776 1777

  case SQLCOM_SET_OPTION:
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1778
    res= mysql_test_set_fields(stmt, tables, &lex->var_list);
1779 1780 1781
    break;

  case SQLCOM_DELETE_MULTI:
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1782
    res= mysql_test_multidelete(stmt, tables);
1783 1784 1785
    break;

  case SQLCOM_INSERT_SELECT:
1786
  case SQLCOM_REPLACE_SELECT:
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1787
    res= mysql_test_insert_select(stmt, tables);
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    break;

  case SQLCOM_SHOW_DATABASES:
  case SQLCOM_SHOW_PROCESSLIST:
  case SQLCOM_SHOW_STORAGE_ENGINES:
  case SQLCOM_SHOW_PRIVILEGES:
  case SQLCOM_SHOW_COLUMN_TYPES:
  case SQLCOM_SHOW_STATUS:
  case SQLCOM_SHOW_VARIABLES:
  case SQLCOM_SHOW_LOGS:
  case SQLCOM_SHOW_TABLES:
  case SQLCOM_SHOW_OPEN_TABLES:
  case SQLCOM_SHOW_CHARSETS:
  case SQLCOM_SHOW_COLLATIONS:
  case SQLCOM_SHOW_FIELDS:
  case SQLCOM_SHOW_KEYS:
  case SQLCOM_SHOW_CREATE_DB:
  case SQLCOM_SHOW_GRANTS:
  case SQLCOM_DROP_TABLE:
  case SQLCOM_RENAME_TABLE:
1808 1809 1810 1811 1812 1813
  case SQLCOM_ALTER_TABLE:
  case SQLCOM_COMMIT:
  case SQLCOM_CREATE_INDEX:
  case SQLCOM_DROP_INDEX:
  case SQLCOM_ROLLBACK:
  case SQLCOM_TRUNCATE:
1814
  case SQLCOM_CALL:
1815
  case SQLCOM_DROP_VIEW:
1816 1817 1818
  case SQLCOM_REPAIR:
  case SQLCOM_ANALYZE:
  case SQLCOM_OPTIMIZE:
1819 1820
    break;

1821 1822 1823
  case SQLCOM_PREPARE:
  case SQLCOM_EXECUTE:
  case SQLCOM_DEALLOCATE_PREPARE:
1824
  default:
1825
    /* All other statements are not supported yet. */
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1826
    my_message(ER_UNSUPPORTED_PS, ER(ER_UNSUPPORTED_PS), MYF(0));
1827
    goto error;
1828
  }
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1829
  if (res == 0)
1830 1831
    DBUG_RETURN(text_protocol? FALSE : (send_prep_stmt(stmt, 0) ||
                                        thd->protocol->flush()));
1832
error:
1833
  DBUG_RETURN(TRUE);
1834 1835
}

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1836
/*
1837 1838
  Initialize array of parameters in statement from LEX.
  (We need to have quick access to items by number in mysql_stmt_get_longdata).
1839
  This is to avoid using malloc/realloc in the parser.
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1840
*/
1841

1842
static bool init_param_array(Prepared_statement *stmt)
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1843
{
1844 1845 1846
  LEX *lex= stmt->lex;
  if ((stmt->param_count= lex->param_list.elements))
  {
1847 1848 1849
    if (stmt->param_count > (uint) UINT_MAX16)
    {
      /* Error code to be defined in 5.0 */
1850 1851
      my_message(ER_PS_MANY_PARAM, ER(ER_PS_MANY_PARAM), MYF(0));
      return TRUE;
1852
    }
1853 1854 1855 1856
    Item_param **to;
    List_iterator<Item_param> param_iterator(lex->param_list);
    /* Use thd->mem_root as it points at statement mem_root */
    stmt->param_array= (Item_param **)
1857
                       alloc_root(stmt->thd->mem_root,
1858 1859
                                  sizeof(Item_param*) * stmt->param_count);
    if (!stmt->param_array)
1860
      return TRUE;
1861 1862 1863 1864 1865 1866 1867
    for (to= stmt->param_array;
         to < stmt->param_array + stmt->param_count;
         ++to)
    {
      *to= param_iterator++;
    }
  }
1868
  return FALSE;
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1869
}
1870

1871

1872
/*
1873
  COM_STMT_PREPARE handler.
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1874

1875 1876
  SYNOPSIS
    mysql_stmt_prepare()
1877 1878 1879 1880 1881 1882 1883
      packet             query to be prepared
      packet_length      query string length, including ignored
                         trailing NULL or quote char.

  DESCRIPTION
    Given a query string with parameter markers, create a prepared
    statement from it and send PS info back to the client.
1884

1885
  NOTES
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1886 1887 1888 1889
    This function parses the query and sends the total number of parameters
    and resultset metadata information back to client (if any), without
    executing the query i.e. without any log/disk writes. This allows the
    queries to be re-executed without re-parsing during execute.
1890 1891

    If parameter markers are found in the query, then store the information
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1892 1893
    using Item_param along with maintaining a list in lex->param_array, so
    that a fast and direct retrieval can be made without going through all
1894
    field items.
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1895

1896 1897 1898
  RETURN VALUE
    none: in case of success a new statement id and metadata is sent
    to the client, otherwise an error message is set in THD.
1899 1900
*/

1901
void mysql_stmt_prepare(THD *thd, const char *packet, uint packet_length)
1902
{
1903
  Prepared_statement *stmt;
1904
  bool error;
1905
  DBUG_ENTER("mysql_stmt_prepare");
1906

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1907
  DBUG_PRINT("prep_query", ("%s", packet));
1908

1909 1910 1911 1912
  /* First of all clear possible warnings from the previous command */
  mysql_reset_thd_for_next_command(thd);

  if (! (stmt= new Prepared_statement(thd, &thd->protocol_prep)))
1913
    DBUG_VOID_RETURN; /* out of memory: error is set in Sql_alloc */
1914

1915
  if (thd->stmt_map.insert(thd, stmt))
1916
  {
1917
    /*
1918
      The error is set in the insert. The statement itself
1919 1920
      will be also deleted there (this is how the hash works).
    */
1921
    DBUG_VOID_RETURN;
1922
  }
1923

1924
  /* Reset warnings from previous command */
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1925
  mysql_reset_errors(thd, 0);
1926 1927 1928
  sp_cache_flush_obsolete(&thd->sp_proc_cache);
  sp_cache_flush_obsolete(&thd->sp_func_cache);

1929 1930
  if (!(specialflag & SPECIAL_NO_PRIOR))
    my_pthread_setprio(pthread_self(),QUERY_PRIOR);
1931

1932
  error= stmt->prepare(packet, packet_length);
1933 1934

  if (!(specialflag & SPECIAL_NO_PRIOR))
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1935
    my_pthread_setprio(pthread_self(),WAIT_PRIOR);
1936

1937
  if (error)
1938
  {
1939 1940
    /* Statement map deletes statement on erase */
    thd->stmt_map.erase(stmt);
1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975
  }
  /* check_prepared_statemnt sends the metadata packet in case of success */
  DBUG_VOID_RETURN;
}

/*
  SYNOPSIS
    get_dynamic_sql_string()
      lex       in      main lex
      query_len out     length of the SQL statement (is set only
                        in case of success)

  DESCRIPTION
    Get an SQL statement text from a user variable or from plain
    text. If the statement is plain text, just assign the
    pointers, otherwise allocate memory in thd->mem_root and copy
    the contents of the variable, possibly with character
    set conversion.

  RETURN VALUE
    non-zero success, 0 in case of error (out of memory)
*/

static const char *get_dynamic_sql_string(LEX *lex, uint *query_len)
{
  THD *thd= lex->thd;
  char *query_str= 0;

  if (lex->prepared_stmt_code_is_varref)
  {
    /* This is PREPARE stmt FROM or EXECUTE IMMEDIATE @var. */
    String str;
    CHARSET_INFO *to_cs= thd->variables.collation_connection;
    bool needs_conversion;
    user_var_entry *entry;
1976
    String *var_value= &str;
1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989
    uint32 unused, len;
    /*
      Convert @var contents to string in connection character set. Although
      it is known that int/real/NULL value cannot be a valid query we still
      convert it for error messages to be uniform.
    */
    if ((entry=
         (user_var_entry*)hash_search(&thd->user_vars,
                                      (byte*)lex->prepared_stmt_code.str,
                                      lex->prepared_stmt_code.length))
        && entry->value)
    {
      my_bool is_var_null;
1990
      var_value= entry->val_str(&is_var_null, &str, NOT_FIXED_DEC);
1991 1992 1993 1994 1995
      /*
        NULL value of variable checked early as entry->value so here
        we can't get NULL in normal conditions
      */
      DBUG_ASSERT(!is_var_null);
1996
      if (!var_value)
1997 1998 1999 2000 2001 2002 2003 2004
        goto end;
    }
    else
    {
      /*
        variable absent or equal to NULL, so we need to set variable to
        something reasonable to get a readable error message during parsing
      */
2005
      str.set(STRING_WITH_LEN("NULL"), &my_charset_latin1);
2006 2007
    }

2008 2009 2010
    needs_conversion= String::needs_conversion(var_value->length(),
                                               var_value->charset(), to_cs,
                                               &unused);
2011

2012 2013
    len= (needs_conversion ? var_value->length() * to_cs->mbmaxlen :
          var_value->length());
2014 2015 2016 2017 2018 2019
    if (!(query_str= alloc_root(thd->mem_root, len+1)))
      goto end;

    if (needs_conversion)
    {
      uint dummy_errors;
2020 2021 2022
      len= copy_and_convert(query_str, len, to_cs, var_value->ptr(),
                            var_value->length(), var_value->charset(),
                            &dummy_errors);
2023 2024
    }
    else
2025 2026
      memcpy(query_str, var_value->ptr(), var_value->length());
    query_str[len]= '\0';                       // Safety (mostly for debug)
2027
    *query_len= len;
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2028
  }
2029
  else
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2030
  {
2031 2032
    query_str= lex->prepared_stmt_code.str;
    *query_len= lex->prepared_stmt_code.length;
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2033
  }
2034 2035
end:
  return query_str;
2036 2037
}

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2038

2039
/* Init PS/SP specific parse tree members.  */
2040

2041
static void init_stmt_after_parse(LEX *lex)
2042 2043
{
  SELECT_LEX *sl= lex->all_selects_list;
2044 2045 2046 2047
  /*
    Switch off a temporary flag that prevents evaluation of
    subqueries in statement prepare.
  */
2048 2049
  for (; sl; sl= sl->next_select_in_list())
   sl->uncacheable&= ~UNCACHEABLE_PREPARE;
2050 2051
}

2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077
/*
  SQLCOM_PREPARE implementation.

  SYNOPSIS
    mysql_sql_stmt_prepare()
      thd     thread handle

  DESCRIPTION
    Prepare an SQL prepared statement. This is called from
    mysql_execute_command and should therefore behave like an
    ordinary query (e.g. should not reset any global THD data).

  RETURN VALUE
    none: in case of success, OK packet is sent to the client,
    otherwise an error message is set in THD
*/

void mysql_sql_stmt_prepare(THD *thd)
{
  LEX *lex= thd->lex;
  LEX_STRING *name= &lex->prepared_stmt_name;
  Prepared_statement *stmt;
  const char *query;
  uint query_len;
  DBUG_ENTER("mysql_sql_stmt_prepare");
  DBUG_ASSERT(thd->protocol == &thd->protocol_simple);
2078
  LINT_INIT(query_len);
2079

2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095
  if ((stmt= (Prepared_statement*) thd->stmt_map.find_by_name(name)))
  {
    /*
      If there is a statement with the same name, remove it. It is ok to
      remove old and fail to insert a new one at the same time.
    */
    if (stmt->deallocate())
      DBUG_VOID_RETURN;
  }

  if (! (query= get_dynamic_sql_string(lex, &query_len)) ||
      ! (stmt= new Prepared_statement(thd, &thd->protocol_simple)))
  {
    DBUG_VOID_RETURN;                           /* out of memory */
  }

2096 2097
  /* Set the name first, insert should know that this statement has a name */
  if (stmt->set_name(name))
2098
  {
2099
    delete stmt;
2100 2101
    DBUG_VOID_RETURN;
  }
2102

2103
  if (thd->stmt_map.insert(thd, stmt))
2104
  {
2105
    /* The statement is deleted and an error is set if insert fails */
2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118
    DBUG_VOID_RETURN;
  }

  if (stmt->prepare(query, query_len+1))
  {
    /* Statement map deletes the statement on erase */
    thd->stmt_map.erase(stmt);
  }
  else
    send_ok(thd, 0L, 0L, "Statement prepared");

  DBUG_VOID_RETURN;
}
2119 2120

/* Reinit prepared statement/stored procedure before execution */
2121

2122
void reinit_stmt_before_use(THD *thd, LEX *lex)
2123
{
2124
  SELECT_LEX *sl= lex->all_selects_list;
2125
  DBUG_ENTER("reinit_stmt_before_use");
2126

2127 2128 2129 2130 2131 2132 2133
  /*
    We have to update "thd" pointer in LEX, all its units and in LEX::result,
    since statements which belong to trigger body are associated with TABLE
    object and because of this can be used in different threads.
  */
  lex->thd= thd;

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  if (lex->empty_field_list_on_rset)
  {
    lex->empty_field_list_on_rset= 0;
2137
    lex->field_list.empty();
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2138
  }
2139
  for (; sl; sl= sl->next_select_in_list())
2140
  {
2141 2142
    if (!sl->first_execution)
    {
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2143 2144 2145
      /* remove option which was put by mysql_explain_union() */
      sl->options&= ~SELECT_DESCRIBE;

2146 2147 2148
      /* see unique_table() */
      sl->exclude_from_table_unique_test= FALSE;

2149
      /*
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2150 2151
        Copy WHERE, HAVING clause pointers to avoid damaging them
        by optimisation
2152
      */
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2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163
      if (sl->prep_where)
      {
        sl->where= sl->prep_where->copy_andor_structure(thd);
        sl->where->cleanup();
      }
      if (sl->prep_having)
      {
        sl->having= sl->prep_having->copy_andor_structure(thd);
        sl->having->cleanup();
      }
      DBUG_ASSERT(sl->join == 0);
2164 2165 2166 2167 2168 2169 2170
      ORDER *order;
      /* Fix GROUP list */
      for (order= (ORDER *)sl->group_list.first; order; order= order->next)
        order->item= &order->item_ptr;
      /* Fix ORDER list */
      for (order= (ORDER *)sl->order_list.first; order; order= order->next)
        order->item= &order->item_ptr;
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2171
    }
2172 2173 2174 2175
    {
      SELECT_LEX_UNIT *unit= sl->master_unit();
      unit->unclean();
      unit->types.empty();
2176
      /* for derived tables & PS (which can't be reset by Item_subquery) */
2177
      unit->reinit_exec_mechanism();
2178
      unit->set_thd(thd);
2179
    }
2180
  }
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2181 2182

  /*
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2183 2184
    TODO: When the new table structure is ready, then have a status bit
    to indicate the table is altered, and re-do the setup_*
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    and open the tables back.
  */
2187 2188 2189 2190 2191
  /*
    NOTE: We should reset whole table list here including all tables added
    by prelocking algorithm (it is not a problem for substatements since
    they have their own table list).
  */
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  for (TABLE_LIST *tables= lex->query_tables;
2193 2194
       tables;
       tables= tables->next_global)
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  {
2196 2197
    tables->reinit_before_use(thd);
  }
2198 2199 2200 2201 2202
  /*
    Cleanup of the special case of DELETE t1, t2 FROM t1, t2, t3 ...
    (multi-delete).  We do a full clean up, although at the moment all we
    need to clean in the tables of MULTI-DELETE list is 'table' member.
  */
2203
  for (TABLE_LIST *tables= (TABLE_LIST*) lex->auxiliary_table_list.first;
2204
       tables;
2205
       tables= tables->next_global)
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2206
  {
2207
    tables->reinit_before_use(thd);
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  }
2209
  lex->current_select= &lex->select_lex;
2210 2211 2212 2213 2214

  /* restore original list used in INSERT ... SELECT */
  if (lex->leaf_tables_insert)
    lex->select_lex.leaf_tables= lex->leaf_tables_insert;

2215
  if (lex->result)
2216
  {
2217
    lex->result->cleanup();
2218 2219
    lex->result->set_thd(thd);
  }
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2220 2221
  lex->allow_sum_func= 0;
  lex->in_sum_func= NULL;
2222
  DBUG_VOID_RETURN;
2223 2224
}

2225

2226 2227
/*
  Clears parameters from data left from previous execution or long data
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2228

2229 2230
  SYNOPSIS
    reset_stmt_params()
2231 2232
      stmt               prepared statement for which parameters should
                         be reset
2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243
*/

static void reset_stmt_params(Prepared_statement *stmt)
{
  Item_param **item= stmt->param_array;
  Item_param **end= item + stmt->param_count;
  for (;item < end ; ++item)
    (**item).reset();
}


2244
/*
2245
  COM_STMT_EXECUTE handler: execute a previously prepared statement.
2246

2247
  SYNOPSIS
2248
    mysql_stmt_execute()
2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261
      thd                current thread
      packet             parameter types and data, if any
      packet_length      packet length, including the terminator character.

  DESCRIPTION
    If there are any parameters, then replace parameter markers with the
    data supplied from the client, and then execute the statement.
    This function uses binary protocol to send a possible result set
    to the client.

  RETURN VALUE
    none: in case of success OK packet or a result set is sent to the
    client, otherwise an error message is set in THD.
2262 2263
*/

2264
void mysql_stmt_execute(THD *thd, char *packet_arg, uint packet_length)
2265
{
2266
  uchar *packet= (uchar*)packet_arg; // GCC 4.0.1 workaround
2267
  ulong stmt_id= uint4korr(packet);
2268
  ulong flags= (ulong) packet[4];
2269
  /* Query text for binary, general or slow log, if any of them is open */
2270
  String expanded_query;
2271
#ifndef EMBEDDED_LIBRARY
2272
  uchar *packet_end= packet + packet_length - 1;
2273
#endif
2274
  Prepared_statement *stmt;
2275
  bool error;
2276
  DBUG_ENTER("mysql_stmt_execute");
2277 2278

  packet+= 9;                               /* stmt_id + 5 bytes of flags */
2279

2280 2281 2282
  /* First of all clear possible warnings from the previous command */
  mysql_reset_thd_for_next_command(thd);

2283
  if (!(stmt= find_prepared_statement(thd, stmt_id, "mysql_stmt_execute")))
2284 2285
    DBUG_VOID_RETURN;

2286 2287
  DBUG_PRINT("exec_query", ("%s", stmt->query));
  DBUG_PRINT("info",("stmt: %p", stmt));
2288

2289 2290 2291
  sp_cache_flush_obsolete(&thd->sp_proc_cache);
  sp_cache_flush_obsolete(&thd->sp_func_cache);

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2292
#ifndef EMBEDDED_LIBRARY
2293
  if (stmt->param_count)
2294
  {
2295 2296 2297
    uchar *null_array= packet;
    if (setup_conversion_functions(stmt, &packet, packet_end) ||
        stmt->set_params(stmt, null_array, packet, packet_end,
2298
                         &expanded_query))
2299
      goto set_params_data_err;
2300
  }
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2301
#else
2302
  /*
konstantin@mysql.com's avatar
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2303 2304
    In embedded library we re-install conversion routines each time
    we set params, and also we don't need to parse packet.
2305
    So we do it in one function.
2306
  */
2307
  if (stmt->param_count && stmt->set_params_data(stmt, &expanded_query))
2308
    goto set_params_data_err;
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2309
#endif
2310 2311
  if (!(specialflag & SPECIAL_NO_PRIOR))
    my_pthread_setprio(pthread_self(),QUERY_PRIOR);
2312 2313 2314 2315 2316 2317 2318 2319

  /*
    If the free_list is not empty, we'll wrongly free some externally
    allocated items when cleaning up after validation of the prepared
    statement.
  */
  DBUG_ASSERT(thd->free_list == NULL);

2320
  error= stmt->execute(&expanded_query,
2321
                       test(flags & (ulong) CURSOR_TYPE_READ_ONLY));
2322 2323
  if (!(specialflag & SPECIAL_NO_PRIOR))
    my_pthread_setprio(pthread_self(), WAIT_PRIOR);
2324
  DBUG_VOID_RETURN;
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2325

2326
set_params_data_err:
2327
  my_error(ER_WRONG_ARGUMENTS, MYF(0), "mysql_stmt_execute");
2328
  reset_stmt_params(stmt);
2329 2330 2331
  DBUG_VOID_RETURN;
}

2332

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2333
/*
2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350
  SQLCOM_EXECUTE implementation.

  SYNOPSIS
    mysql_sql_stmt_execute()
      thd                thread handle

  DESCRIPTION
    Execute prepared statement using parameter values from
    lex->prepared_stmt_params and send result to the client using
    text protocol. This is called from mysql_execute_command and
    therefore should behave like an ordinary query (e.g. not change
    global THD data, such as warning count, server status, etc).
    This function uses text protocol to send a possible result set.

  RETURN
    none: in case of success, OK (or result set) packet is sent to the
    client, otherwise an error is set in THD
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2351 2352
*/

2353
void mysql_sql_stmt_execute(THD *thd)
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2354
{
2355
  LEX *lex= thd->lex;
2356
  Prepared_statement *stmt;
2357 2358
  LEX_STRING *name= &lex->prepared_stmt_name;
  /* Query text for binary, general or slow log, if any of them is open */
2359
  String expanded_query;
2360
  DBUG_ENTER("mysql_sql_stmt_execute");
2361
  DBUG_PRINT("info", ("EXECUTE: %.*s\n", name->length, name->str));
2362

2363
  if (!(stmt= (Prepared_statement*) thd->stmt_map.find_by_name(name)))
2364
  {
2365 2366
    my_error(ER_UNKNOWN_STMT_HANDLER, MYF(0),
             name->length, name->str, "EXECUTE");
2367
    DBUG_VOID_RETURN;
2368 2369
  }

2370
  if (stmt->param_count != lex->prepared_stmt_params.elements)
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2371
  {
2372
    my_error(ER_WRONG_ARGUMENTS, MYF(0), "EXECUTE");
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2373 2374 2375
    DBUG_VOID_RETURN;
  }

2376 2377
  DBUG_PRINT("info",("stmt: %p", stmt));

2378 2379 2380 2381 2382 2383 2384
  /*
    If the free_list is not empty, we'll wrongly free some externally
    allocated items when cleaning up after validation of the prepared
    statement.
  */
  DBUG_ASSERT(thd->free_list == NULL);

2385
  if (stmt->set_params_from_vars(stmt, lex->prepared_stmt_params,
2386
                                 &expanded_query))
2387
    goto set_params_data_err;
2388

2389
  (void) stmt->execute(&expanded_query, FALSE);
2390

2391
  DBUG_VOID_RETURN;
2392 2393 2394 2395 2396

set_params_data_err:
  my_error(ER_WRONG_ARGUMENTS, MYF(0), "EXECUTE");
  reset_stmt_params(stmt);
  DBUG_VOID_RETURN;
2397 2398
}

2399

2400
/*
2401
  COM_STMT_FETCH handler: fetches requested amount of rows from cursor
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2402

2403
  SYNOPSIS
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2404
    mysql_stmt_fetch()
2405 2406 2407
      thd                Thread handle
      packet             Packet from client (with stmt_id & num_rows)
      packet_length      Length of packet
2408 2409 2410 2411 2412 2413
*/

void mysql_stmt_fetch(THD *thd, char *packet, uint packet_length)
{
  /* assume there is always place for 8-16 bytes */
  ulong stmt_id= uint4korr(packet);
2414
  ulong num_rows= uint4korr(packet+4);
2415
  Prepared_statement *stmt;
2416
  Statement stmt_backup;
2417
  Server_side_cursor *cursor;
2418 2419
  DBUG_ENTER("mysql_stmt_fetch");

2420
  /* First of all clear possible warnings from the previous command */
2421
  mysql_reset_thd_for_next_command(thd);
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2422
  statistic_increment(thd->status_var.com_stmt_fetch, &LOCK_status);
2423 2424 2425
  if (!(stmt= find_prepared_statement(thd, stmt_id, "mysql_stmt_fetch")))
    DBUG_VOID_RETURN;

2426
  cursor= stmt->cursor;
2427
  if (!cursor)
2428
  {
2429
    my_error(ER_STMT_HAS_NO_OPEN_CURSOR, MYF(0), stmt_id);
2430 2431
    DBUG_VOID_RETURN;
  }
2432

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2433
  thd->stmt_arena= stmt;
2434
  thd->set_n_backup_statement(stmt, &stmt_backup);
2435 2436 2437 2438

  if (!(specialflag & SPECIAL_NO_PRIOR))
    my_pthread_setprio(pthread_self(), QUERY_PRIOR);

2439
  cursor->fetch(num_rows);
2440 2441 2442 2443

  if (!(specialflag & SPECIAL_NO_PRIOR))
    my_pthread_setprio(pthread_self(), WAIT_PRIOR);

2444
  if (!cursor->is_open())
2445
  {
2446 2447
    stmt->close_cursor();
    thd->cursor= 0;
2448 2449 2450
    reset_stmt_params(stmt);
  }

2451
  thd->restore_backup_statement(stmt, &stmt_backup);
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2452
  thd->stmt_arena= thd;
2453

2454 2455 2456 2457
  DBUG_VOID_RETURN;
}


2458
/*
2459
  Reset a prepared statement in case there was a recoverable error.
2460 2461
  SYNOPSIS
    mysql_stmt_reset()
2462 2463
      thd                Thread handle
      packet             Packet with stmt id
2464 2465

  DESCRIPTION
2466 2467 2468 2469 2470
    This function resets statement to the state it was right after prepare.
    It can be used to:
     - clear an error happened during mysql_stmt_send_long_data
     - cancel long data stream for all placeholders without
       having to call mysql_stmt_execute.
2471
     - close an open cursor
2472 2473
    Sends 'OK' packet in case of success (statement was reset)
    or 'ERROR' packet (unrecoverable error/statement not found/etc).
2474 2475
*/

2476
void mysql_stmt_reset(THD *thd, char *packet)
2477
{
2478
  /* There is always space for 4 bytes in buffer */
2479
  ulong stmt_id= uint4korr(packet);
2480
  Prepared_statement *stmt;
2481
  DBUG_ENTER("mysql_stmt_reset");
2482

2483 2484 2485
  /* First of all clear possible warnings from the previous command */
  mysql_reset_thd_for_next_command(thd);

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2486
  statistic_increment(thd->status_var.com_stmt_reset, &LOCK_status);
2487
  if (!(stmt= find_prepared_statement(thd, stmt_id, "mysql_stmt_reset")))
2488 2489
    DBUG_VOID_RETURN;

2490 2491 2492 2493 2494 2495 2496
  stmt->close_cursor();

  /*
    Clear parameters from data which could be set by
    mysql_stmt_send_long_data() call.
  */
  reset_stmt_params(stmt);
2497

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2498
  stmt->state= Query_arena::PREPARED;
2499

2500
  send_ok(thd);
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2501

2502 2503 2504 2505 2506
  DBUG_VOID_RETURN;
}


/*
2507
  Delete a prepared statement from memory.
2508
  Note: we don't send any reply to this command.
2509 2510
*/

2511
void mysql_stmt_close(THD *thd, char *packet)
2512
{
2513
  /* There is always space for 4 bytes in packet buffer */
2514
  ulong stmt_id= uint4korr(packet);
2515
  Prepared_statement *stmt;
2516
  DBUG_ENTER("mysql_stmt_close");
2517

2518
  if (!(stmt= find_prepared_statement(thd, stmt_id, "mysql_stmt_close")))
2519
    goto out;
2520

2521 2522 2523 2524
  /*
    The only way currently a statement can be deallocated when it's
    in use is from within Dynamic SQL.
  */
2525
  DBUG_ASSERT(! (stmt->flags & (uint) Prepared_statement::IS_IN_USE));
2526 2527
  (void) stmt->deallocate();

2528 2529 2530
out:
  /* clear errors, response packet is not expected */
  thd->clear_error();
2531 2532 2533
  DBUG_VOID_RETURN;
}

2534 2535

/*
2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566
  SQLCOM_DEALLOCATE implementation.

  DESCRIPTION
    Close an SQL prepared statement. As this can be called from Dynamic
    SQL, we should be careful to not close a statement that is currently
    being executed.

  RETURN VALUE
    none: OK packet is sent in case of success, otherwise an error
    message is set in THD
*/

void mysql_sql_stmt_close(THD *thd)
{
  Prepared_statement* stmt;
  LEX_STRING *name= &thd->lex->prepared_stmt_name;
  DBUG_PRINT("info", ("DEALLOCATE PREPARE: %.*s\n", name->length, name->str));

  if (! (stmt= (Prepared_statement*) thd->stmt_map.find_by_name(name)))
  {
    my_error(ER_UNKNOWN_STMT_HANDLER, MYF(0),
             name->length, name->str, "DEALLOCATE PREPARE");
    return;
  }

  if (stmt->deallocate() == 0)
    send_ok(thd);
}

/*
  Handle long data in pieces from client.
2567 2568 2569

  SYNOPSIS
    mysql_stmt_get_longdata()
2570 2571
      thd                Thread handle
      packet             String to append
2572
      packet_length      Length of string (including end \0)
2573 2574

  DESCRIPTION
2575 2576 2577 2578 2579
    Get a part of a long data. To make the protocol efficient, we are
    not sending any return packets here. If something goes wrong, then
    we will send the error on 'execute' We assume that the client takes
    care of checking that all parts are sent to the server. (No checking
    that we get a 'end of column' in the server is performed).
2580 2581
*/

2582
void mysql_stmt_get_longdata(THD *thd, char *packet, ulong packet_length)
2583
{
2584 2585
  ulong stmt_id;
  uint param_number;
2586
  Prepared_statement *stmt;
2587
  Item_param *param;
2588
#ifndef EMBEDDED_LIBRARY
2589
  char *packet_end= packet + packet_length - 1;
2590
#endif
2591 2592
  DBUG_ENTER("mysql_stmt_get_longdata");

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2593
  statistic_increment(thd->status_var.com_stmt_send_long_data, &LOCK_status);
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2594
#ifndef EMBEDDED_LIBRARY
2595
  /* Minimal size of long data packet is 6 bytes */
2596
  if (packet_length <= MYSQL_LONG_DATA_HEADER)
2597
    goto out;
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2598
#endif
2599

2600 2601
  stmt_id= uint4korr(packet);
  packet+= 4;
2602

2603 2604
  if (!(stmt=find_prepared_statement(thd, stmt_id,
                                     "mysql_stmt_send_long_data")))
2605 2606
    DBUG_VOID_RETURN;

2607 2608
  param_number= uint2korr(packet);
  packet+= 2;
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2609
#ifndef EMBEDDED_LIBRARY
2610 2611
  if (param_number >= stmt->param_count)
  {
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2612
    /* Error will be sent in execute call */
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2613
    stmt->state= Query_arena::ERROR;
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2614
    stmt->last_errno= ER_WRONG_ARGUMENTS;
2615 2616
    sprintf(stmt->last_error, ER(ER_WRONG_ARGUMENTS),
            "mysql_stmt_send_long_data");
2617
    goto out;
2618
  }
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2619 2620
#endif

2621 2622
  param= stmt->param_array[param_number];

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2623
#ifndef EMBEDDED_LIBRARY
2624
  if (param->set_longdata(packet, (ulong) (packet_end - packet)))
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2625
#else
2626
  if (param->set_longdata(thd->extra_data, thd->extra_length))
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2627
#endif
2628
  {
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2629
    stmt->state= Query_arena::ERROR;
2630 2631 2632
    stmt->last_errno= ER_OUTOFMEMORY;
    sprintf(stmt->last_error, ER(ER_OUTOFMEMORY), 0);
  }
2633 2634 2635 2636

out:
  /* clear errors, response packet is not expected */
  thd->clear_error();
2637 2638
  DBUG_VOID_RETURN;
}
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2639

2640

2641 2642 2643 2644
/***************************************************************************
 Select_fetch_protocol_prep
****************************************************************************/

2645 2646
Select_fetch_protocol_prep::Select_fetch_protocol_prep(THD *thd_arg)
  :protocol(thd_arg)
2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693
{}

bool Select_fetch_protocol_prep::send_fields(List<Item> &list, uint flags)
{
  bool rc;
  Protocol *save_protocol= thd->protocol;

  /*
    Protocol::send_fields caches the information about column types:
    this information is later used to send data. Therefore, the same
    dedicated Protocol object must be used for all operations with
    a cursor.
  */
  thd->protocol= &protocol;
  rc= select_send::send_fields(list, flags);
  thd->protocol= save_protocol;

  return rc;
}

bool Select_fetch_protocol_prep::send_eof()
{
  Protocol *save_protocol= thd->protocol;

  thd->protocol= &protocol;
  ::send_eof(thd);
  thd->protocol= save_protocol;
  return FALSE;
}


bool
Select_fetch_protocol_prep::send_data(List<Item> &fields)
{
  Protocol *save_protocol= thd->protocol;
  bool rc;

  thd->protocol= &protocol;
  rc= select_send::send_data(fields);
  thd->protocol= save_protocol;
  return rc;
}

/***************************************************************************
 Prepared_statement
****************************************************************************/

2694
Prepared_statement::Prepared_statement(THD *thd_arg, Protocol *protocol_arg)
2695 2696
  :Statement(&main_lex, &main_mem_root,
             INITIALIZED, ++thd_arg->statement_id_counter),
2697
  thd(thd_arg),
2698
  result(thd_arg),
2699
  protocol(protocol_arg),
2700
  param_array(0),
2701
  param_count(0),
2702
  last_errno(0),
2703
  flags((uint) IS_IN_USE)
2704
{
2705
  init_sql_alloc(&main_mem_root, thd_arg->variables.query_alloc_block_size,
2706
                  thd_arg->variables.query_prealloc_size);
2707 2708 2709
  *last_error= '\0';
}

2710

2711 2712 2713
void Prepared_statement::setup_set_params()
{
  /* Setup binary logging */
2714 2715
  if (mysql_bin_log.is_open() && is_update_query(lex->sql_command) ||
      mysql_log.is_open() || mysql_slow_log.is_open())
2716
  {
2717
    set_params_from_vars= insert_params_from_vars_with_log;
2718
#ifndef EMBEDDED_LIBRARY
2719
    set_params= insert_params_withlog;
2720
#else
2721
    set_params_data= emb_insert_params_withlog;
2722 2723 2724
#endif
  }
  else
2725 2726
  {
    set_params_from_vars= insert_params_from_vars;
2727
#ifndef EMBEDDED_LIBRARY
2728
    set_params= insert_params;
2729
#else
2730
    set_params_data= emb_insert_params;
2731
#endif
2732
  }
2733 2734
}

2735

2736 2737 2738 2739 2740 2741 2742 2743
/*
  DESCRIPTION
    Destroy this prepared statement, cleaning up all used memory
    and resources. This is called from ::deallocate() to
    handle COM_STMT_CLOSE and DEALLOCATE PREPARE or when
    THD ends and all prepared statements are freed.
*/

2744 2745
Prepared_statement::~Prepared_statement()
{
2746 2747
  DBUG_ENTER("Prepared_statement::~Prepared_statement");
  DBUG_PRINT("enter",("stmt: %p  cursor: %p", this, cursor));
2748
  delete cursor;
2749 2750 2751 2752 2753
  /*
    We have to call free on the items even if cleanup is called as some items,
    like Item_param, don't free everything until free_items()
  */
  free_items();
2754
  delete lex->result;
2755
  free_root(&main_mem_root, MYF(0));
2756
  DBUG_VOID_RETURN;
2757 2758 2759
}


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2760
Query_arena::Type Prepared_statement::type() const
2761 2762 2763
{
  return PREPARED_STATEMENT;
}
2764 2765


2766
void Prepared_statement::cleanup_stmt()
2767
{
2768
  DBUG_ENTER("Prepared_statement::cleanup_stmt");
2769 2770
  DBUG_PRINT("enter",("stmt: %p", this));

2771
  DBUG_ASSERT(lex->sphead == 0);
2772 2773 2774 2775 2776 2777 2778
  /* The order is important */
  lex->unit.cleanup();
  cleanup_items(free_list);
  thd->cleanup_after_query();
  close_thread_tables(thd);
  thd->rollback_item_tree_changes();

2779
  DBUG_VOID_RETURN;
2780
}
2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823


bool Prepared_statement::set_name(LEX_STRING *name_arg)
{
  name.length= name_arg->length;
  name.str= memdup_root(mem_root, (char*) name_arg->str, name_arg->length);
  return name.str == 0;
}

/**************************************************************************
  Common parts of mysql_[sql]_stmt_prepare, mysql_[sql]_stmt_execute.
  Essentially, these functions do all the magic of preparing/executing
  a statement, leaving network communication, input data handling and
  global THD state management to the caller.
***************************************************************************/

/*
  Parse statement text, validate the statement, and prepare it for execution.

  SYNOPSIS
    Prepared_statement::prepare()
      packet             statement text
      packet_len

  DESCRIPTION
    You should not change global THD state in this function, if at all
    possible: it may be called from any context, e.g. when executing
    a COM_* command, and SQLCOM_* command, or a stored procedure.

  NOTES
      Precondition.
      -------------
    The caller must ensure that thd->change_list and thd->free_list
    is empty: this function will not back them up but will free
    in the end of its execution.

      Postcondition.
      --------------
    thd->mem_root contains unused memory allocated during validation.
*/

bool Prepared_statement::prepare(const char *packet, uint packet_len)
{
2824
  bool error;
2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850
  Statement stmt_backup;
  Query_arena *old_stmt_arena;
  DBUG_ENTER("Prepared_statement::prepare");
  /*
    If this is an SQLCOM_PREPARE, we also increase Com_prepare_sql.
    However, it seems handy if com_stmt_prepare is increased always,
    no matter what kind of prepare is processed.
  */
  statistic_increment(thd->status_var.com_stmt_prepare, &LOCK_status);

  /*
    alloc_query() uses thd->memroot && thd->query, so we should call
    both of backup_statement() and backup_query_arena() here.
  */
  thd->set_n_backup_statement(this, &stmt_backup);
  thd->set_n_backup_active_arena(this, &stmt_backup);

  if (alloc_query(thd, packet, packet_len))
  {
    thd->restore_backup_statement(this, &stmt_backup);
    thd->restore_active_arena(this, &stmt_backup);
    DBUG_RETURN(TRUE);
  }

  old_stmt_arena= thd->stmt_arena;
  thd->stmt_arena= this;
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  Lex_input_stream lip(thd, thd->query, thd->query_length);
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  lip.stmt_prepare_mode= TRUE;
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  thd->m_lip= &lip;
  lex_start(thd);
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  lex->safe_to_cache_query= FALSE;
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  int err= MYSQLparse((void *)thd);
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  lex->set_trg_event_type_for_tables();
2859

2860
  error= err || thd->is_fatal_error ||
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      thd->net.report_error || init_param_array(this);
2862

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  /*
    While doing context analysis of the query (in check_prepared_statement)
    we allocate a lot of additional memory: for open tables, JOINs, derived
    tables, etc.  Let's save a snapshot of current parse tree to the
    statement and restore original THD. In cases when some tree
    transformation can be reused on execute, we set again thd->mem_root from
    stmt->mem_root (see setup_wild for one place where we do that).
  */
  thd->restore_active_arena(this, &stmt_backup);

  /*
    If called from a stored procedure, ensure that we won't rollback
    external changes when cleaning up after validation.
  */
  DBUG_ASSERT(thd->change_list.is_empty());
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  /* 
   The only case where we should have items in the thd->free_list is
   after stmt->set_params_from_vars(), which may in some cases create
   Item_null objects.
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  */

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  if (error == 0)
    error= check_prepared_statement(this, name.str != 0);
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  /*
    Currently CREATE PROCEDURE/TRIGGER/EVENT are prohibited in prepared
    statements: ensure we have no memory leak here if by someone tries
    to PREPARE stmt FROM "CREATE PROCEDURE ..."
  */
  DBUG_ASSERT(lex->sphead == NULL || error != 0);
  if (lex->sphead)
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  {
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    delete lex->sphead;
    lex->sphead= NULL;
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  }
2899

2900
  lex_end(lex);
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  cleanup_stmt();
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  thd->restore_backup_statement(this, &stmt_backup);
  thd->stmt_arena= old_stmt_arena;

2905
  if (error == 0)
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  {
    setup_set_params();
    init_stmt_after_parse(lex);
    state= Query_arena::PREPARED;
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    flags&= ~ (uint) IS_IN_USE;
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    /* 
      Log COM_EXECUTE to the general log. Note, that in case of SQL
      prepared statements this causes two records to be output:

      Query       PREPARE stmt from @user_variable
      Prepare     <statement SQL text>

      This is considered user-friendly, since in the
      second log entry we output the actual statement text.

      Do not print anything if this is an SQL prepared statement and
      we're inside a stored procedure (also called Dynamic SQL) --
      sub-statements inside stored procedures are not logged into
      the general log.
    */
    if (thd->spcont == NULL)
    {
      const char *format= "[%lu] %.*b";
      mysql_log.write(thd, COM_STMT_PREPARE, format, id,
                      query_length, query);

    }
2934
  }
2935
  DBUG_RETURN(error);
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}

/*
  Execute a prepared statement.

  SYNOPSIS
    Prepared_statement::execute()
      expanded_query     A query for binlogging which has all parameter
                         markers ('?') replaced with their actual values.
      open_cursor        True if an attempt to open a cursor should be made.
                         Currenlty used only in the binary protocol.

  DESCRIPTION
    You should not change global THD state in this function, if at all
    possible: it may be called from any context, e.g. when executing
    a COM_* command, and SQLCOM_* command, or a stored procedure.

  NOTES
      Preconditions, postconditions.
      ------------------------------
      See the comment for Prepared_statement::prepare().
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  RETURN
    FALSE		ok
    TRUE		Error
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*/

bool Prepared_statement::execute(String *expanded_query, bool open_cursor)
{
  Statement stmt_backup;
  Query_arena *old_stmt_arena;
2967
  bool error= TRUE;
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  statistic_increment(thd->status_var.com_stmt_execute, &LOCK_status);

  /* Check if we got an error when sending long data */
  if (state == Query_arena::ERROR)
  {
    my_message(last_errno, last_error, MYF(0));
2975
    return TRUE;
2976
  }
2977
  if (flags & (uint) IS_IN_USE)
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  {
    my_error(ER_PS_NO_RECURSION, MYF(0));
2980
    return TRUE;
2981
  }
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  /*
    For SHOW VARIABLES lex->result is NULL, as it's a non-SELECT
    command. For such queries we don't return an error and don't
    open a cursor -- the client library will recognize this case and
    materialize the result set.
    For SELECT statements lex->result is created in
    check_prepared_statement. lex->result->simple_select() is FALSE
    in INSERT ... SELECT and similar commands.
  */

2993
  if (open_cursor && lex->result && lex->result->check_simple_select())
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  {
    DBUG_PRINT("info",("Cursor asked for not SELECT stmt"));
    return TRUE;
  }

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  /* In case the command has a call to SP which re-uses this statement name */
  flags|= IS_IN_USE;

3002
  close_cursor();
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  /*
    If the free_list is not empty, we'll wrongly free some externally
    allocated items when cleaning up after execution of this statement.
  */
  DBUG_ASSERT(thd->change_list.is_empty());
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  /* 
   The only case where we should have items in the thd->free_list is
   after stmt->set_params_from_vars(), which may in some cases create
   Item_null objects.
  */

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  thd->set_n_backup_statement(this, &stmt_backup);
  if (expanded_query->length() &&
      alloc_query(thd, (char*) expanded_query->ptr(),
                  expanded_query->length()+1))
  {
    my_error(ER_OUTOFMEMORY, 0, expanded_query->length());
    goto error;
  }
  /*
    Expanded query is needed for slow logging, so we want thd->query
    to point at it even after we restore from backup. This is ok, as
    expanded query was allocated in thd->mem_root.
  */
  stmt_backup.query= thd->query;
  stmt_backup.query_length= thd->query_length;

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  /*
    Save orig_sql_command as we use it to disable slow logging for SHOW
    commands (see log_slow_statement()).
  */
  stmt_backup.lex->orig_sql_command= thd->lex->orig_sql_command;

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  /*
    At first execution of prepared statement we may perform logical
    transformations of the query tree. Such changes should be performed
    on the parse tree of current prepared statement and new items should
    be allocated in its memory root. Set the appropriate pointer in THD
    to the arena of the statement.
  */
  old_stmt_arena= thd->stmt_arena;
  thd->stmt_arena= this;
  reinit_stmt_before_use(thd, lex);

  thd->protocol= protocol;                      /* activate stmt protocol */
3050 3051 3052 3053
  error= (open_cursor ?
          mysql_open_cursor(thd, (uint) ALWAYS_MATERIALIZED_CURSOR,
                            &result, &cursor) :
          mysql_execute_command(thd));
3054 3055
  thd->protocol= &thd->protocol_simple;         /* use normal protocol */

3056
  /* Assert that if an error, no cursor is open */
monty@mysql.com's avatar
monty@mysql.com committed
3057
  DBUG_ASSERT(! (error && cursor));
3058

3059
  if (! cursor)
3060
  {
3061
    cleanup_stmt();
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    reset_stmt_params(this);
  }

  thd->set_statement(&stmt_backup);
  thd->stmt_arena= old_stmt_arena;

  if (state == Query_arena::PREPARED)
    state= Query_arena::EXECUTED;

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  /*
    Log COM_EXECUTE to the general log. Note, that in case of SQL
    prepared statements this causes two records to be output:

    Query       EXECUTE <statement name>
    Execute     <statement SQL text>

    This is considered user-friendly, since in the
    second log entry we output values of parameter markers.

    Do not print anything if this is an SQL prepared statement and
    we're inside a stored procedure (also called Dynamic SQL) --
    sub-statements inside stored procedures are not logged into
    the general log.
  */
  if (error == 0 && thd->spcont == NULL)
  {
    const char *format= "[%lu] %.*b";
    mysql_log.write(thd, COM_STMT_EXECUTE, format, id,
                    thd->query_length, thd->query);
  }

3093
error:
3094 3095
  flags&= ~ (uint) IS_IN_USE;
  return error;
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}


/* Common part of DEALLOCATE PREPARE and mysql_stmt_close */

bool Prepared_statement::deallocate()
{
  /* We account deallocate in the same manner as mysql_stmt_close */
  statistic_increment(thd->status_var.com_stmt_close, &LOCK_status);
3105
  if (flags & (uint) IS_IN_USE)
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  {
    my_error(ER_PS_NO_RECURSION, MYF(0));
    return TRUE;
  }
  /* Statement map calls delete stmt on erase */
  thd->stmt_map.erase(this);
  return FALSE;
}