sql_class.h 15.8 KB
Newer Older
unknown's avatar
unknown committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult 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
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   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 */


/* Classes in mysql */

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

class Query_log_event;
class Load_log_event;

27
enum enum_ha_read_modes { RFIRST, RNEXT, RPREV, RLAST, RKEY };
unknown's avatar
unknown committed
28 29 30 31 32 33 34 35
enum enum_duplicates { DUP_ERROR, DUP_REPLACE, DUP_IGNORE };
enum enum_log_type { LOG_CLOSED, LOG_NORMAL, LOG_NEW, LOG_BIN };

// log info errors 
#define LOG_INFO_EOF -1
#define LOG_INFO_IO  -2
#define LOG_INFO_INVALID -3
#define LOG_INFO_SEEK -4
unknown's avatar
unknown committed
36 37 38 39
#define LOG_INFO_PURGE_NO_ROTATE -5
#define LOG_INFO_MEM -6
#define LOG_INFO_FATAL -7
#define LOG_INFO_IN_USE -8
unknown's avatar
unknown committed
40 41 42 43 44

typedef struct st_log_info
{
  char log_file_name[FN_REFLEN];
  my_off_t index_file_offset;
unknown's avatar
unknown committed
45 46 47
  my_off_t pos;
  bool fatal; // if the purge happens to give us a negative offset
  pthread_mutex_t lock;
48
  st_log_info():fatal(0) { pthread_mutex_init(&lock, MY_MUTEX_INIT_FAST);}
unknown's avatar
unknown committed
49
  ~st_log_info() { pthread_mutex_destroy(&lock);}
unknown's avatar
unknown committed
50 51 52 53 54 55 56
} LOG_INFO;


class MYSQL_LOG {
 private:
  pthread_mutex_t LOCK_log, LOCK_index;
  time_t last_time,query_start;
57 58
  IO_CACHE log_file;
  File index_file;
unknown's avatar
unknown committed
59
  char *name;
60
  volatile enum_log_type log_type;
unknown's avatar
unknown committed
61 62
  char time_buff[20],db[NAME_LEN+1];
  char log_file_name[FN_REFLEN],index_file_name[FN_REFLEN];
63
  bool write_error,inited;
unknown's avatar
unknown committed
64 65 66 67
  bool no_rotate; // for binlog - if log name can never change
  // we should not try to rotate it or write any rotation events
  // the user should use FLUSH MASTER instead of FLUSH LOGS for
  // purging
unknown's avatar
unknown committed
68 69 70 71 72 73 74 75 76

public:
  MYSQL_LOG();
  ~MYSQL_LOG();
  pthread_mutex_t* get_log_lock() { return &LOCK_log; }
  void set_index_file_name(const char* index_file_name = 0);
  void open(const char *log_name,enum_log_type log_type,
	    const char *new_name=0);
  void new_file(void);
77 78
  bool write(THD *thd, enum enum_server_command command,const char *format,...);
  bool write(THD *thd, const char *query, uint query_length,
79
	     time_t query_start=0);
80 81 82
  bool write(Query_log_event* event_info); // binary log write
  bool write(Load_log_event* event_info);
  bool write(IO_CACHE *cache);
unknown's avatar
unknown committed
83 84 85
  int generate_new_name(char *new_name,const char *old_name);
  void make_log_name(char* buf, const char* log_ident);
  bool is_active(const char* log_file_name);
unknown's avatar
unknown committed
86
  int purge_logs(THD* thd, const char* to_log);
unknown's avatar
unknown committed
87 88 89 90 91 92 93 94
  void close(bool exiting = 0); // if we are exiting, we also want to close the
  // index file

  // iterating through the log index file
  int find_first_log(LOG_INFO* linfo, const char* log_name);
  int find_next_log(LOG_INFO* linfo);
  int get_current_log(LOG_INFO* linfo);

95
  inline bool is_open() { return log_type != LOG_CLOSED; }
unknown's avatar
unknown committed
96 97
  char* get_index_fname() { return index_file_name;}
  char* get_log_fname() { return log_file_name; }
unknown's avatar
unknown committed
98 99
  void lock_index() { pthread_mutex_lock(&LOCK_index);}
  void unlock_index() { pthread_mutex_unlock(&LOCK_index);}
100
  File get_index_file() { return index_file;}
unknown's avatar
unknown committed
101 102 103 104
};

/* character conversion tables */

105 106 107
class CONVERT;
CONVERT *get_convert_set(const char *name_ptr);

unknown's avatar
unknown committed
108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202
class CONVERT
{
  const uchar *from_map,*to_map;
  void convert_array(const uchar *mapping,uchar *buff,uint length);
public:
  const char *name;
  CONVERT(const char *name_par,uchar *from_par,uchar *to_par)
    :from_map(from_par),to_map(to_par),name(name_par) {}
  friend CONVERT *get_convert_set(const char *name_ptr);
  inline void convert(char *a,uint length)
  {
    convert_array(from_map, (uchar*) a,length);
  }
  bool store(String *, const char *,uint);
};

typedef struct st_copy_info {
  ha_rows records;
  ha_rows deleted;
  ha_rows copied;
  ha_rows error;
  enum enum_duplicates handle_duplicates;
  int escape_char;
} COPY_INFO;


class key_part_spec :public Sql_alloc {
public:
  const char *field_name;
  uint length;
  key_part_spec(const char *name,uint len=0) :field_name(name), length(len) {}
};


class Alter_drop :public Sql_alloc {
public:
  enum drop_type {KEY, COLUMN };
  const char *name;
  enum drop_type type;
  Alter_drop(enum drop_type par_type,const char *par_name)
    :name(par_name), type(par_type) {}
};


class Alter_column :public Sql_alloc {
public:
  const char *name;
  Item *def;
  Alter_column(const char *par_name,Item *literal)
    :name(par_name), def(literal) {}
};


class Key :public Sql_alloc {
public:
  enum Keytype { PRIMARY, UNIQUE, MULTIPLE, FULLTEXT };
  enum Keytype type;
  List<key_part_spec> columns;
  const char *Name;

  Key(enum Keytype type_par,const char *name_arg,List<key_part_spec> &cols)
    :type(type_par), columns(cols),Name(name_arg) {}
  ~Key() {}
  const char *name() { return Name; }
};


typedef struct st_mysql_lock
{
  TABLE **table;
  uint table_count,lock_count;
  THR_LOCK_DATA **locks;
} MYSQL_LOCK;


class LEX_COLUMN : public Sql_alloc
{
public:
  String column;
  uint rights;
  LEX_COLUMN (const String& x,const  uint& y ): column (x),rights (y) {}
};

#include "sql_lex.h"				/* Must be here */

// needed to be able to have an I_List of char* strings.in mysqld.cc where we cannot use String
// because it is Sql_alloc'ed
class i_string: public ilink
{
public:
  char* ptr;
  i_string():ptr(0) { }
  i_string(char* s) : ptr(s) {}
};

unknown's avatar
unknown committed
203 204 205 206 207 208 209
//needed for linked list of two strings for replicate-rewrite-db
class i_string_pair: public ilink
{
public:
  char* key;
  char* val;
  i_string_pair():key(0),val(0) { }
unknown's avatar
unknown committed
210
  i_string_pair(char* key_arg, char* val_arg) : key(key_arg),val(val_arg) {}
unknown's avatar
unknown committed
211 212 213
};


unknown's avatar
unknown committed
214 215 216 217 218 219 220 221 222 223
/****************************************************************************
** every connection is handle by a thread with a THD
****************************************************************************/

class delayed_insert;

class THD :public ilink {
public:
  NET	  net;
  LEX	  lex;
224
  MEM_ROOT mem_root;
unknown's avatar
unknown committed
225 226 227 228 229 230 231 232 233
  HASH     user_vars;
  String  packet;				/* Room for 1 row */
  struct  sockaddr_in remote;
  struct  rand_struct rand;
  char	  *query,*thread_stack;
  char	  *host,*user,*priv_user,*db,*ip;
  const   char *proc_info;
  uint	  client_capabilities,max_packet_length;
  uint	  master_access,db_access;
unknown's avatar
unknown committed
234
  TABLE   *open_tables,*temporary_tables, *handler_tables;
unknown's avatar
unknown committed
235 236 237 238
  MYSQL_LOCK *lock,*locked_tables;
  ULL	  *ull;
  struct st_my_thread_var *mysys_var;
  enum enum_server_command command;
239
  uint32 server_id;
unknown's avatar
unknown committed
240 241 242
  const char *where;
  char* last_nx_table; // last non-existent table, we need this for replication
  char* last_nx_db; // database of the last nx table
unknown's avatar
unknown committed
243
  time_t  start_time,time_after_lock,user_time;
unknown's avatar
unknown committed
244 245 246 247
  time_t  connect_time,thr_create_time; // track down slow pthread_create
  thr_lock_type update_lock_default;
  delayed_insert *di;
  struct st_transactions {
248
    IO_CACHE trans_log;
249 250
    THD_TRANS all;			/* Trans since BEGIN WORK */
    THD_TRANS stmt;			/* Trans for current statement */
unknown's avatar
unknown committed
251 252
    uint bdb_lock_count;
  } transaction;
253 254 255
#ifdef HAVE_GEMINI_DB
  struct st_gemini gemini;
#endif
unknown's avatar
unknown committed
256
  Item	     *free_list, *handler_items;
unknown's avatar
unknown committed
257 258 259 260 261
  CONVERT    *convert_set;
  Field      *dupp_field;
#ifndef __WIN__
  sigset_t signals,block_signals;
#endif
262 263 264
#ifdef SIGNAL_WITH_VIO_CLOSE
  Vio* active_vio;
  pthread_mutex_t active_vio_lock;
265
#endif  
266
  ulonglong  next_insert_id,last_insert_id,current_insert_id, limit_found_rows;
unknown's avatar
unknown committed
267
  ha_rows select_limit,offset_limit,default_select_limit,cuted_fields,
268
          max_join_size,sent_row_count;
269
  table_map	used_tables;
unknown's avatar
unknown committed
270
  ulong query_id,version, inactive_timeout,options,thread_id;
271
  ulong      gemini_spin_retries;
unknown's avatar
unknown committed
272 273 274
  long  dbug_thread_id;
  pthread_t  real_id;
  uint	current_tablenr,tmp_table,cond_count,col_access,query_length;
275
  uint  server_status,open_options;
unknown's avatar
unknown committed
276
  enum_tx_isolation tx_isolation, session_tx_isolation;
unknown's avatar
unknown committed
277
  char	     scramble[9];
unknown's avatar
unknown committed
278
  bool       slave_thread;
unknown's avatar
unknown committed
279 280
  bool	     set_query_id,locked,count_cuted_fields,some_tables_deleted;
  bool	     no_errors, allow_sum_func, password, fatal_error;
unknown's avatar
unknown committed
281
  bool	     query_start_used,last_insert_id_used,insert_id_used;
unknown's avatar
unknown committed
282
  bool	     system_thread,in_lock_tables,global_read_lock;
unknown's avatar
unknown committed
283 284
  bool       query_error, bootstrap;
  bool	     volatile killed;
unknown's avatar
unknown committed
285 286 287 288
  LOG_INFO*  current_linfo;
  // if we do a purge of binary logs, log index info of the threads
  // that are currently reading it needs to be adjusted. To do that
  // each thread that is using LOG_INFO needs to adjust the pointer to it
289 290

  ulong slave_proxy_id; // in slave thread we need to know in behalf of which
291
  // thread the query is being run to replicate temp tables properly
unknown's avatar
unknown committed
292

unknown's avatar
unknown committed
293 294 295
  THD();
  ~THD();
  bool store_globals();
296 297
#ifdef SIGNAL_WITH_VIO_CLOSE
  inline void set_active_vio(Vio* vio)
298
  {
299 300 301
    pthread_mutex_lock(&active_vio_lock);
    active_vio = vio;
    pthread_mutex_unlock(&active_vio_lock);
302
  }
303
  inline void clear_active_vio()
304
  {
305 306 307
    pthread_mutex_lock(&active_vio_lock);
    active_vio = 0;
    pthread_mutex_unlock(&active_vio_lock);
308
  }
309
  inline void close_active_vio()
310
  {
311 312
    pthread_mutex_lock(&active_vio_lock);
    if(active_vio)
313
      {
314 315
	vio_close(active_vio);
        active_vio = 0;
316
      }
317
    pthread_mutex_unlock(&active_vio_lock);
318 319
  }
#endif  
320
  void prepare_to_die();
unknown's avatar
unknown committed
321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339
  inline const char* enter_cond(pthread_cond_t *cond, pthread_mutex_t* mutex,
			  const char* msg)
  {
    const char* old_msg = proc_info;
    pthread_mutex_lock(&mysys_var->mutex);
    mysys_var->current_mutex = mutex;
    mysys_var->current_cond = cond;
    proc_info = msg;
    pthread_mutex_unlock(&mysys_var->mutex);
    return old_msg;
  }
  inline void exit_cond(const char* old_msg)
  {
    pthread_mutex_lock(&mysys_var->mutex);
    mysys_var->current_mutex = 0;
    mysys_var->current_cond = 0;
    proc_info = old_msg;
    pthread_mutex_unlock(&mysys_var->mutex);
  }
unknown's avatar
unknown committed
340
  inline time_t query_start() { query_start_used=1; return start_time; }
unknown's avatar
unknown committed
341
  inline void	set_time()    { if (user_time) start_time=time_after_lock=user_time; else time_after_lock=time(&start_time); }
342
  inline void	end_time()    { time(&start_time); }
unknown's avatar
unknown committed
343
  inline void	set_time(time_t t) { time_after_lock=start_time=user_time=t; }
344
  inline void	lock_time()   { time(&time_after_lock); }
unknown's avatar
unknown committed
345 346 347 348 349 350 351 352 353 354 355
  inline void	insert_id(ulonglong id)
  { last_insert_id=id; insert_id_used=1; }
  inline ulonglong insert_id(void)
  {
    if (!last_insert_id_used)
    {      
      last_insert_id_used=1;
      current_insert_id=last_insert_id;
    }
    return last_insert_id;
  }
356 357 358 359
  inline ulonglong found_rows(void)
  {
    return limit_found_rows;
  }                                                                         
360 361
  inline bool active_transaction()
  {
362
#ifdef USING_TRANSACTIONS    
363 364
    return (transaction.all.bdb_tid != 0 ||
	    transaction.all.innobase_tid != 0 || 
365
	    transaction.all.gemini_tid != 0);
366 367 368 369
#else
    return 0;
#endif
    
370
  }
371 372 373 374 375 376 377 378 379 380 381 382
  inline gptr alloc(unsigned int size) { return alloc_root(&mem_root,size); }
  inline gptr calloc(unsigned int size)
  {
    gptr ptr;
    if ((ptr=alloc_root(&mem_root,size)))
      bzero((char*) ptr,size);
    return ptr;
  }
  inline char *strdup(const char *str)
  { return strdup_root(&mem_root,str); }
  inline char *memdup(const char *str, unsigned int size)
  { return memdup_root(&mem_root,str,size); }
unknown's avatar
unknown committed
383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552
};


class sql_exchange :public Sql_alloc
{
public:
  char *file_name;
  String *field_term,*enclosed,*line_term,*line_start,*escaped;
  bool opt_enclosed;
  bool dumpfile;
  uint skip_lines;
  sql_exchange(char *name,bool dumpfile_flag);
  ~sql_exchange() {}
};

#include "log_event.h"

/*
** This is used to get result from a select
*/

class select_result :public Sql_alloc {
protected:
  THD *thd;
public:
  select_result();
  virtual ~select_result() {};
  virtual int prepare(List<Item> &list) { return 0; }
  virtual bool send_fields(List<Item> &list,uint flag)=0;
  virtual bool send_data(List<Item> &items)=0;
  virtual void send_error(uint errcode,const char *err)=0;
  virtual bool send_eof()=0;
  virtual void abort() {}
};


class select_send :public select_result {
public:
  select_send() {}
  bool send_fields(List<Item> &list,uint flag);
  bool send_data(List<Item> &items);
  void send_error(uint errcode,const char *err);
  bool send_eof();
};


class select_export :public select_result {
  sql_exchange *exchange;
  File file;
  IO_CACHE cache;
  ha_rows row_count;
  uint field_term_length;
  int field_sep_char,escape_char,line_sep_char;
  bool fixed_row_size;
public:
  select_export(sql_exchange *ex) :exchange(ex),file(-1),row_count(0L) {}
  ~select_export();
  int prepare(List<Item> &list);
  bool send_fields(List<Item> &list,
		   uint flag) { return 0; }
  bool send_data(List<Item> &items);
  void send_error(uint errcode,const char *err);
  bool send_eof();
};

class select_dump :public select_result {
  sql_exchange *exchange;
  File file;
  IO_CACHE cache;
  ha_rows row_count;
  char path[FN_REFLEN];
public:
  select_dump(sql_exchange *ex) :exchange(ex),file(-1),row_count(0L)
  { path[0]=0; }
  ~select_dump();
  int prepare(List<Item> &list);
  bool send_fields(List<Item> &list,
		   uint flag) { return 0; }
  bool send_data(List<Item> &items);
  void send_error(uint errcode,const char *err);
  bool send_eof();
};


class select_insert :public select_result {
 protected:
  TABLE *table;
  List<Item> *fields;
  uint save_time_stamp;
  ulonglong last_insert_id;
  COPY_INFO info;

public:
  select_insert(TABLE *table_par,List<Item> *fields_par,enum_duplicates duplic)
    :table(table_par),fields(fields_par), save_time_stamp(0),last_insert_id(0)
    {
      bzero((char*) &info,sizeof(info));
      info.handle_duplicates=duplic;
    }
  ~select_insert();
  int prepare(List<Item> &list);
  bool send_fields(List<Item> &list,
		   uint flag) { return 0; }
  bool send_data(List<Item> &items);
  void send_error(uint errcode,const char *err);
  bool send_eof();
};

class select_create: public select_insert {
  ORDER *group;
  const char *db;
  const char *name;
  List<create_field> *extra_fields;
  List<Key> *keys;
  HA_CREATE_INFO *create_info;
  MYSQL_LOCK *lock;
  Field **field;
public:
  select_create (const char *db_name, const char *table_name,
		 HA_CREATE_INFO *create_info_par,
		 List<create_field> &fields_par,
		 List<Key> &keys_par,
		 List<Item> &select_fields,enum_duplicates duplic)
    :select_insert (NULL, &select_fields, duplic), db(db_name),
    name(table_name), extra_fields(&fields_par),keys(&keys_par),
    create_info(create_info_par),
    lock(0)
    {}
  int prepare(List<Item> &list);
  bool send_data(List<Item> &values);
  bool send_eof();
  void abort();
};

/* Structs used when sorting */

typedef struct st_sort_field {
  Field *field;				/* Field to sort */
  Item	*item;				/* Item if not sorting fields */
  uint	 length;			/* Length of sort field */
  my_bool reverse;			/* if descending sort */
  Item_result result_type;		/* Type of item */
} SORT_FIELD;


typedef struct st_sort_buffer {
  uint index;					/* 0 or 1 */
  uint sort_orders;
  uint change_pos;				/* If sort-fields changed */
  char **buff;
  SORT_FIELD *sortorder;
} SORT_BUFFER;


/* Structure for db & table in sql_yacc */

class Table_ident :public Sql_alloc {
 public:
  LEX_STRING db;
  LEX_STRING table;
  inline Table_ident(LEX_STRING db_arg,LEX_STRING table_arg,bool force)
    :table(table_arg)
  {
    if (!force && (current_thd->client_capabilities & CLIENT_NO_SCHEMA))
      db.str=0;
    else
      db= db_arg;
  }
  inline Table_ident(LEX_STRING table_arg) :table(table_arg) {db.str=0;}
  inline void change_db(char *db_name)
unknown's avatar
unknown committed
553
  { db.str= db_name; db.length=(uint) strlen(db_name); }
unknown's avatar
unknown committed
554 555 556 557 558 559 560 561
};

// this is needed for user_vars hash
class user_var_entry
{
 public:
  LEX_STRING name;
  char *value;
562
  ulong length, update_query_id;
unknown's avatar
unknown committed
563 564 565
  Item_result type;
};