protocol.h 5.74 KB
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/* Copyright (C) 2002-2006 MySQL AB
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   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
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */

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#ifdef USE_PRAGMA_INTERFACE
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#pragma interface			/* gcc class implementation */
#endif


class i_string;
class THD;
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typedef struct st_mysql_field MYSQL_FIELD;
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typedef struct st_mysql_rows MYSQL_ROWS;

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class Protocol
{
protected:
  THD	 *thd;
  String *packet;
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  String *convert;
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  uint field_pos;
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#ifndef DBUG_OFF
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  enum enum_field_types *field_types;
#endif
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  uint field_count;
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#ifndef EMBEDDED_LIBRARY
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  bool net_store_data(const char *from, uint length);
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#else
  virtual bool net_store_data(const char *from, uint length);
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  char **next_field;
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  MYSQL_FIELD *next_mysql_field;
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  MEM_ROOT *alloc;
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#endif
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  bool store_string_aux(const char *from, uint length,
                        CHARSET_INFO *fromcs, CHARSET_INFO *tocs);
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public:
  Protocol() {}
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  Protocol(THD *thd_arg) { init(thd_arg); }
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  virtual ~Protocol() {}
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  void init(THD* thd_arg);
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  enum { SEND_NUM_ROWS= 1, SEND_DEFAULTS= 2, SEND_EOF= 4 };
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  virtual bool send_fields(List<Item> *list, uint flags);
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  bool store(I_List<i_string> *str_list);
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  bool store(const char *from, CHARSET_INFO *cs);
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  String *storage_packet() { return packet; }
  inline void free() { packet->free(); }
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  virtual bool write();
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  inline  bool store(uint32 from)
  { return store_long((longlong) from); }
  inline  bool store(longlong from)
  { return store_longlong((longlong) from, 0); }
  inline  bool store(ulonglong from)
  { return store_longlong((longlong) from, 1); }
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  inline bool store(String *str)
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  { return store((char*) str->ptr(), str->length(), str->charset()); }
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  virtual bool prepare_for_send(List<Item> *item_list) 
  {
    field_count=item_list->elements;
    return 0;
  }
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  virtual bool flush();
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  virtual void prepare_for_resend()=0;

  virtual bool store_null()=0;
  virtual bool store_tiny(longlong from)=0;
  virtual bool store_short(longlong from)=0;
  virtual bool store_long(longlong from)=0;
  virtual bool store_longlong(longlong from, bool unsigned_flag)=0;
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  virtual bool store_decimal(const my_decimal *)=0;
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  virtual bool store(const char *from, uint length, CHARSET_INFO *cs)=0;
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  virtual bool store(const char *from, uint length, 
  		     CHARSET_INFO *fromcs, CHARSET_INFO *tocs)=0;
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  virtual bool store(float from, uint32 decimals, String *buffer)=0;
  virtual bool store(double from, uint32 decimals, String *buffer)=0;
  virtual bool store(TIME *time)=0;
  virtual bool store_date(TIME *time)=0;
  virtual bool store_time(TIME *time)=0;
  virtual bool store(Field *field)=0;
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#ifdef EMBEDDED_LIBRARY
  int begin_dataset();
  virtual void remove_last_row() {}
#else
  void remove_last_row() {}
#endif
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};


/* Class used for the old (MySQL 4.0 protocol) */

class Protocol_simple :public Protocol
{
public:
  Protocol_simple() {}
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  Protocol_simple(THD *thd_arg) :Protocol(thd_arg) {}
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  virtual void prepare_for_resend();
  virtual bool store_null();
  virtual bool store_tiny(longlong from);
  virtual bool store_short(longlong from);
  virtual bool store_long(longlong from);
  virtual bool store_longlong(longlong from, bool unsigned_flag);
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  virtual bool store_decimal(const my_decimal *);
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  virtual bool store(const char *from, uint length, CHARSET_INFO *cs);
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  virtual bool store(const char *from, uint length,
  		     CHARSET_INFO *fromcs, CHARSET_INFO *tocs);
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  virtual bool store(TIME *time);
  virtual bool store_date(TIME *time);
  virtual bool store_time(TIME *time);
  virtual bool store(float nr, uint32 decimals, String *buffer);
  virtual bool store(double from, uint32 decimals, String *buffer);
  virtual bool store(Field *field);
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#ifdef EMBEDDED_LIBRARY
  void remove_last_row();
#endif
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};


class Protocol_prep :public Protocol
{
private:
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  uint bit_fields;
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public:
  Protocol_prep() {}
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  Protocol_prep(THD *thd_arg) :Protocol(thd_arg) {}
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  virtual bool prepare_for_send(List<Item> *item_list);
  virtual void prepare_for_resend();
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#ifdef EMBEDDED_LIBRARY
  virtual bool write();
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  bool net_store_data(const char *from, uint length);
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#endif
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  virtual bool store_null();
  virtual bool store_tiny(longlong from);
  virtual bool store_short(longlong from);
  virtual bool store_long(longlong from);
  virtual bool store_longlong(longlong from, bool unsigned_flag);
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  virtual bool store_decimal(const my_decimal *);
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  virtual bool store(const char *from,uint length, CHARSET_INFO *cs);
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  virtual bool store(const char *from, uint length,
  		     CHARSET_INFO *fromcs, CHARSET_INFO *tocs);
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  virtual bool store(TIME *time);
  virtual bool store_date(TIME *time);
  virtual bool store_time(TIME *time);
  virtual bool store(float nr, uint32 decimals, String *buffer);
  virtual bool store(double from, uint32 decimals, String *buffer);
  virtual bool store(Field *field);
};

void send_warning(THD *thd, uint sql_errno, const char *err=0);
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void net_printf_error(THD *thd, uint sql_errno, ...);
void net_send_error(THD *thd, uint sql_errno=0, const char *err=0);
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void send_ok(THD *thd, ha_rows affected_rows=0L, ulonglong id=0L,
	     const char *info=0);
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void send_eof(THD *thd);
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bool send_old_password_request(THD *thd);
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char *net_store_data(char *to,const char *from, uint length);
char *net_store_data(char *to,int32 from);
char *net_store_data(char *to,longlong from);
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