item_strfunc.h 22.8 KB
Newer Older
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
1
/* Copyright (C) 2000-2003 MySQL AB
2

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3 4
   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
5
   the Free Software Foundation; version 2 of the License.
6

bk@work.mysql.com's avatar
bk@work.mysql.com committed
7 8 9 10
   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.
11

bk@work.mysql.com's avatar
bk@work.mysql.com committed
12 13 14 15 16 17 18
   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 */


/* This file defines all string functions */

19
#ifdef USE_PRAGMA_INTERFACE
bk@work.mysql.com's avatar
bk@work.mysql.com committed
20 21 22 23 24
#pragma interface			/* gcc class implementation */
#endif

class Item_str_func :public Item_func
{
25 26 27 28 29 30 31 32 33 34
protected:
  /**
     Sets the result value of the function an empty string, using the current
     character set. No memory is allocated.
     @retval A pointer to the str_value member.
   */
  String *make_empty_result() {
    str_value.set("", 0, collation.collation);
    return &str_value; 
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
35 36 37 38 39 40 41 42 43
public:
  Item_str_func() :Item_func() { decimals=NOT_FIXED_DEC; }
  Item_str_func(Item *a) :Item_func(a) {decimals=NOT_FIXED_DEC; }
  Item_str_func(Item *a,Item *b) :Item_func(a,b) { decimals=NOT_FIXED_DEC; }
  Item_str_func(Item *a,Item *b,Item *c) :Item_func(a,b,c) { decimals=NOT_FIXED_DEC; }
  Item_str_func(Item *a,Item *b,Item *c,Item *d) :Item_func(a,b,c,d) {decimals=NOT_FIXED_DEC; }
  Item_str_func(Item *a,Item *b,Item *c,Item *d, Item* e) :Item_func(a,b,c,d,e) {decimals=NOT_FIXED_DEC; }
  Item_str_func(List<Item> &list) :Item_func(list) {decimals=NOT_FIXED_DEC; }
  longlong val_int();
44
  double val_real();
45
  my_decimal *val_decimal(my_decimal *);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
46 47
  enum Item_result result_type () const { return STRING_RESULT; }
  void left_right_max_length();
48
  bool fix_fields(THD *thd, Item **ref);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
49 50 51 52 53 54
};

class Item_func_md5 :public Item_str_func
{
  String tmp_value;
public:
55 56 57 58
  Item_func_md5(Item *a) :Item_str_func(a)
  {
    collation.set(&my_charset_bin);
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
59 60 61 62 63
  String *val_str(String *);
  void fix_length_and_dec();
  const char *func_name() const { return "md5"; }
};

64

65 66 67
class Item_func_sha :public Item_str_func
{
public:
68 69 70 71
  Item_func_sha(Item *a) :Item_str_func(a)
  {
    collation.set(&my_charset_bin);
  }
72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95
  String *val_str(String *);    
  void fix_length_and_dec();      
  const char *func_name() const { return "sha"; }	
};

class Item_func_aes_encrypt :public Item_str_func
{
public:
  Item_func_aes_encrypt(Item *a, Item *b) :Item_str_func(a,b) {}
  String *val_str(String *);
  void fix_length_and_dec();
  const char *func_name() const { return "aes_encrypt"; }
};

class Item_func_aes_decrypt :public Item_str_func	
{
public:
  Item_func_aes_decrypt(Item *a, Item *b) :Item_str_func(a,b) {}
  String *val_str(String *);
  void fix_length_and_dec();
  const char *func_name() const { return "aes_decrypt"; }
};


bk@work.mysql.com's avatar
bk@work.mysql.com committed
96 97 98 99 100 101 102 103 104 105 106 107 108 109 110
class Item_func_concat :public Item_str_func
{
  String tmp_value;
public:
  Item_func_concat(List<Item> &list) :Item_str_func(list) {}
  Item_func_concat(Item *a,Item *b) :Item_str_func(a,b) {}
  String *val_str(String *);
  void fix_length_and_dec();
  const char *func_name() const { return "concat"; }
};

class Item_func_concat_ws :public Item_str_func
{
  String tmp_value;
public:
111
  Item_func_concat_ws(List<Item> &list) :Item_str_func(list) {}
bk@work.mysql.com's avatar
bk@work.mysql.com committed
112 113
  String *val_str(String *);
  void fix_length_and_dec();
114
  const char *func_name() const { return "concat_ws"; }
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
115
  table_map not_null_tables() const { return 0; }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
116 117 118 119
};

class Item_func_reverse :public Item_str_func
{
igor@olga.mysql.com's avatar
igor@olga.mysql.com committed
120
  String tmp_value;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
121 122 123 124
public:
  Item_func_reverse(Item *a) :Item_str_func(a) {}
  String *val_str(String *);
  void fix_length_and_dec();
125
  const char *func_name() const { return "reverse"; }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
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
};


class Item_func_replace :public Item_str_func
{
  String tmp_value,tmp_value2;
public:
  Item_func_replace(Item *org,Item *find,Item *replace)
    :Item_str_func(org,find,replace) {}
  String *val_str(String *);
  void fix_length_and_dec();
  const char *func_name() const { return "replace"; }
};


class Item_func_insert :public Item_str_func
{
  String tmp_value;
public:
  Item_func_insert(Item *org,Item *start,Item *length,Item *new_str)
    :Item_str_func(org,start,length,new_str) {}
  String *val_str(String *);
  void fix_length_and_dec();
  const char *func_name() const { return "insert"; }
};


class Item_str_conv :public Item_str_func
{
155 156
protected:
  uint multiply;
157
  my_charset_conv_case converter;
158
  String tmp_value;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
159 160
public:
  Item_str_conv(Item *item) :Item_str_func(item) {}
161
  String *val_str(String *);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
162 163 164 165 166 167 168 169
};


class Item_func_lcase :public Item_str_conv
{
public:
  Item_func_lcase(Item *item) :Item_str_conv(item) {}
  const char *func_name() const { return "lcase"; }
170
  void fix_length_and_dec();
bk@work.mysql.com's avatar
bk@work.mysql.com committed
171 172 173 174 175 176 177
};

class Item_func_ucase :public Item_str_conv
{
public:
  Item_func_ucase(Item *item) :Item_str_conv(item) {}
  const char *func_name() const { return "ucase"; }
178
  void fix_length_and_dec();
bk@work.mysql.com's avatar
bk@work.mysql.com committed
179 180 181 182 183
};


class Item_func_left :public Item_str_func
{
184
  String tmp_value;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221
public:
  Item_func_left(Item *a,Item *b) :Item_str_func(a,b) {}
  String *val_str(String *);
  void fix_length_and_dec();
  const char *func_name() const { return "left"; }
};


class Item_func_right :public Item_str_func
{
  String tmp_value;
public:
  Item_func_right(Item *a,Item *b) :Item_str_func(a,b) {}
  String *val_str(String *);
  void fix_length_and_dec();
  const char *func_name() const { return "right"; }
};


class Item_func_substr :public Item_str_func
{
  String tmp_value;
public:
  Item_func_substr(Item *a,Item *b) :Item_str_func(a,b) {}
  Item_func_substr(Item *a,Item *b,Item *c) :Item_str_func(a,b,c) {}
  String *val_str(String *);
  void fix_length_and_dec();
  const char *func_name() const { return "substr"; }
};


class Item_func_substr_index :public Item_str_func
{
  String tmp_value;
public:
  Item_func_substr_index(Item *a,Item *b,Item *c) :Item_str_func(a,b,c) {}
  String *val_str(String *);
222
  void fix_length_and_dec();
223
  const char *func_name() const { return "substring_index"; }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
224 225 226
};


227
class Item_func_trim :public Item_str_func
bk@work.mysql.com's avatar
bk@work.mysql.com committed
228
{
229
protected:
bk@work.mysql.com's avatar
bk@work.mysql.com committed
230
  String tmp_value;
231
  String remove;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
232
public:
233 234
  Item_func_trim(Item *a,Item *b) :Item_str_func(a,b) {}
  Item_func_trim(Item *a) :Item_str_func(a) {}
bk@work.mysql.com's avatar
bk@work.mysql.com committed
235
  String *val_str(String *);
236 237
  void fix_length_and_dec();
  const char *func_name() const { return "trim"; }
238
  virtual void print(String *str, enum_query_type query_type);
239
  virtual const char *mode_name() const { return "both"; }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
240 241 242
};


243
class Item_func_ltrim :public Item_func_trim
bk@work.mysql.com's avatar
bk@work.mysql.com committed
244 245
{
public:
246 247
  Item_func_ltrim(Item *a,Item *b) :Item_func_trim(a,b) {}
  Item_func_ltrim(Item *a) :Item_func_trim(a) {}
bk@work.mysql.com's avatar
bk@work.mysql.com committed
248
  String *val_str(String *);
249
  const char *func_name() const { return "ltrim"; }
250
  const char *mode_name() const { return "leading"; }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
251 252
};

253 254

class Item_func_rtrim :public Item_func_trim
bk@work.mysql.com's avatar
bk@work.mysql.com committed
255 256
{
public:
257 258
  Item_func_rtrim(Item *a,Item *b) :Item_func_trim(a,b) {}
  Item_func_rtrim(Item *a) :Item_func_trim(a) {}
bk@work.mysql.com's avatar
bk@work.mysql.com committed
259
  String *val_str(String *);
260
  const char *func_name() const { return "rtrim"; }
261
  const char *mode_name() const { return "trailing"; }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
262 263 264
};


265 266 267 268 269
/*
  Item_func_password -- new (4.1.1) PASSWORD() function implementation.
  Returns strcat('*', octet2hex(sha1(sha1(password)))). '*' stands for new
  password format, sha1(sha1(password) is so-called hash_stage2 value.
  Length of returned string is always 41 byte. To find out how entire
270
  authentication procedure works, see comments in password.c.
271 272
*/

bk@work.mysql.com's avatar
bk@work.mysql.com committed
273 274
class Item_func_password :public Item_str_func
{
275
  char tmp_value[SCRAMBLED_PASSWORD_CHAR_LENGTH+1]; 
bk@work.mysql.com's avatar
bk@work.mysql.com committed
276 277
public:
  Item_func_password(Item *a) :Item_str_func(a) {}
278 279
  String *val_str(String *str);
  void fix_length_and_dec() { max_length= SCRAMBLED_PASSWORD_CHAR_LENGTH; }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
280
  const char *func_name() const { return "password"; }
281
  static char *alloc(THD *thd, const char *password, size_t pass_len);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
282 283
};

284

285 286 287
/*
  Item_func_old_password -- PASSWORD() implementation used in MySQL 3.21 - 4.0
  compatibility mode. This item is created in sql_yacc.yy when
288
  'old_passwords' session variable is set, and to handle OLD_PASSWORD()
289 290 291
  function.
*/

292 293
class Item_func_old_password :public Item_str_func
{
294
  char tmp_value[SCRAMBLED_PASSWORD_CHAR_LENGTH_323+1];
295 296
public:
  Item_func_old_password(Item *a) :Item_str_func(a) {}
297 298
  String *val_str(String *str);
  void fix_length_and_dec() { max_length= SCRAMBLED_PASSWORD_CHAR_LENGTH_323; } 
299
  const char *func_name() const { return "old_password"; }
300
  static char *alloc(THD *thd, const char *password, size_t pass_len);
301 302 303
};


304 305
class Item_func_des_encrypt :public Item_str_func
{
306
  String tmp_value,tmp_arg;
307 308 309 310
public:
  Item_func_des_encrypt(Item *a) :Item_str_func(a) {}
  Item_func_des_encrypt(Item *a, Item *b): Item_str_func(a,b) {}
  String *val_str(String *);
311
  void fix_length_and_dec()
312 313 314 315 316
  {
    maybe_null=1;
    /* 9 = MAX ((8- (arg_len % 8)) + 1) */
    max_length = args[0]->max_length + 9;
  }
317
  const char *func_name() const { return "des_encrypt"; }
318 319 320 321 322 323 324 325 326
};

class Item_func_des_decrypt :public Item_str_func
{
  String tmp_value;
public:
  Item_func_des_decrypt(Item *a) :Item_str_func(a) {}
  Item_func_des_decrypt(Item *a, Item *b): Item_str_func(a,b) {}
  String *val_str(String *);
327 328 329 330 331 332
  void fix_length_and_dec()
  {
    maybe_null=1;
    /* 9 = MAX ((8- (arg_len % 8)) + 1) */
    max_length = args[0]->max_length - 9;
  }
333
  const char *func_name() const { return "des_decrypt"; }
334 335
};

bk@work.mysql.com's avatar
bk@work.mysql.com committed
336 337 338
class Item_func_encrypt :public Item_str_func
{
  String tmp_value;
339 340 341 342 343 344

  /* Encapsulate common constructor actions */
  void constructor_helper()
  {
    collation.set(&my_charset_bin);
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
345
public:
346 347 348 349 350 351 352 353
  Item_func_encrypt(Item *a) :Item_str_func(a)
  {
    constructor_helper();
  }
  Item_func_encrypt(Item *a, Item *b): Item_str_func(a,b)
  {
    constructor_helper();
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
354 355
  String *val_str(String *);
  void fix_length_and_dec() { maybe_null=1; max_length = 13; }
356
  const char *func_name() const { return "encrypt"; }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
357 358 359 360
};

#include "sql_crypt.h"

361

bk@work.mysql.com's avatar
bk@work.mysql.com committed
362 363
class Item_func_encode :public Item_str_func
{
364 365 366 367 368
private:
  /** Whether the PRNG has already been seeded. */
  bool seeded;
protected:
  SQL_CRYPT sql_crypt;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
369
public:
370 371
  Item_func_encode(Item *a, Item *seed):
    Item_str_func(a, seed) {}
bk@work.mysql.com's avatar
bk@work.mysql.com committed
372 373
  String *val_str(String *);
  void fix_length_and_dec();
374
  const char *func_name() const { return "encode"; }
375
protected:
Davi Arnaut's avatar
Davi Arnaut committed
376
  virtual void crypto_transform(String *);
377 378 379
private:
  /** Provide a seed for the PRNG sequence. */
  bool seed();
bk@work.mysql.com's avatar
bk@work.mysql.com committed
380 381
};

382

bk@work.mysql.com's avatar
bk@work.mysql.com committed
383 384 385
class Item_func_decode :public Item_func_encode
{
public:
386
  Item_func_decode(Item *a, Item *seed): Item_func_encode(a, seed) {}
387
  const char *func_name() const { return "decode"; }
388
protected:
Davi Arnaut's avatar
Davi Arnaut committed
389
  void crypto_transform(String *);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
390 391 392
};


393
class Item_func_sysconst :public Item_str_func
bk@work.mysql.com's avatar
bk@work.mysql.com committed
394 395
{
public:
396 397 398
  Item_func_sysconst()
  { collation.set(system_charset_info,DERIVATION_SYSCONST); }
  Item *safe_charset_converter(CHARSET_INFO *tocs);
399 400 401 402 403 404
  /*
    Used to create correct Item name in new converted item in
    safe_charset_converter, return string representation of this function
    call
  */
  virtual const char *fully_qualified_func_name() const = 0;
405 406
};

407

408 409 410 411
class Item_func_database :public Item_func_sysconst
{
public:
  Item_func_database() :Item_func_sysconst() {}
bk@work.mysql.com's avatar
bk@work.mysql.com committed
412
  String *val_str(String *);
413 414
  void fix_length_and_dec()
  {
415
    max_length= MAX_FIELD_NAME * system_charset_info->mbmaxlen;
416
    maybe_null=1;
417
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
418
  const char *func_name() const { return "database"; }
419
  const char *fully_qualified_func_name() const { return "database()"; }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
420 421
};

422

423
class Item_func_user :public Item_func_sysconst
bk@work.mysql.com's avatar
bk@work.mysql.com committed
424
{
425 426
protected:
  bool init (const char *user, const char *host);
427

bk@work.mysql.com's avatar
bk@work.mysql.com committed
428
public:
429 430 431 432 433 434 435 436 437 438
  Item_func_user()
  {
    str_value.set("", 0, system_charset_info);
  }
  String *val_str(String *)
  {
    DBUG_ASSERT(fixed == 1);
    return (null_value ? 0 : &str_value);
  }
  bool fix_fields(THD *thd, Item **ref);
439 440
  void fix_length_and_dec()
  {
441 442
    max_length= (USERNAME_LENGTH +
                 (HOSTNAME_LENGTH + 1) * SYSTEM_CHARSET_MBMAXLEN);
443
  }
444 445
  const char *func_name() const { return "user"; }
  const char *fully_qualified_func_name() const { return "user()"; }
446 447 448 449
  int save_in_field(Field *field, bool no_conversions)
  {
    return save_str_value_in_field(field, &str_value);
  }
450 451 452 453 454 455 456 457 458 459 460 461 462
};


class Item_func_current_user :public Item_func_user
{
  Name_resolution_context *context;

public:
  Item_func_current_user(Name_resolution_context *context_arg)
    : context(context_arg) {}
  bool fix_fields(THD *thd, Item **ref);
  const char *func_name() const { return "current_user"; }
  const char *fully_qualified_func_name() const { return "current_user()"; }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
463 464 465 466 467
};


class Item_func_soundex :public Item_str_func
{
468
  String tmp_value;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
469 470 471 472 473 474 475 476 477 478 479
public:
  Item_func_soundex(Item *a) :Item_str_func(a) {}
  String *val_str(String *);
  void fix_length_and_dec();
  const char *func_name() const { return "soundex"; }
};


class Item_func_elt :public Item_str_func
{
public:
480
  Item_func_elt(List<Item> &list) :Item_str_func(list) {}
481
  double val_real();
bk@work.mysql.com's avatar
bk@work.mysql.com committed
482 483 484 485 486 487 488 489 490 491 492 493 494 495 496
  longlong val_int();
  String *val_str(String *str);
  void fix_length_and_dec();
  const char *func_name() const { return "elt"; }
};


class Item_func_make_set :public Item_str_func
{
  Item *item;
  String tmp_str;

public:
  Item_func_make_set(Item *a,List<Item> &list) :Item_str_func(list),item(a) {}
  String *val_str(String *str);
497
  bool fix_fields(THD *thd, Item **ref)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
498
  {
499
    DBUG_ASSERT(fixed == 0);
500
    return ((!item->fixed && item->fix_fields(thd, &item)) ||
501
	    item->check_cols(1) ||
502
	    Item_func::fix_fields(thd, ref));
bk@work.mysql.com's avatar
bk@work.mysql.com committed
503
  }
504
  void split_sum_func(THD *thd, Item **ref_pointer_array, List<Item> &fields);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
505 506 507
  void fix_length_and_dec();
  void update_used_tables();
  const char *func_name() const { return "make_set"; }
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
508

509
  bool walk(Item_processor processor, bool walk_subquery, uchar *arg)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
510
  {
511 512
    return item->walk(processor, walk_subquery, arg) ||
      Item_str_func::walk(processor, walk_subquery, arg);
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
513
  }
514
  Item *transform(Item_transformer transformer, uchar *arg);
515
  virtual void print(String *str, enum_query_type query_type);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
516 517 518 519 520 521 522
};


class Item_func_format :public Item_str_func
{
  String tmp_str;
public:
523
  Item_func_format(Item *org, Item *dec);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
524
  String *val_str(String *);
525
  void fix_length_and_dec();
bk@work.mysql.com's avatar
bk@work.mysql.com committed
526
  const char *func_name() const { return "format"; }
527
  virtual void print(String *str, enum_query_type query_type);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
528 529 530 531 532 533
};


class Item_func_char :public Item_str_func
{
public:
534 535 536 537
  Item_func_char(List<Item> &list) :Item_str_func(list)
  { collation.set(&my_charset_bin); }
  Item_func_char(List<Item> &list, CHARSET_INFO *cs) :Item_str_func(list)
  { collation.set(cs); }  
bk@work.mysql.com's avatar
bk@work.mysql.com committed
538
  String *val_str(String *);
539
  void fix_length_and_dec() 
540
  {
541
    max_length= arg_count * 4;
542
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559
  const char *func_name() const { return "char"; }
};


class Item_func_repeat :public Item_str_func
{
  String tmp_value;
public:
  Item_func_repeat(Item *arg1,Item *arg2) :Item_str_func(arg1,arg2) {}
  String *val_str(String *);
  void fix_length_and_dec();
  const char *func_name() const { return "repeat"; }
};


class Item_func_rpad :public Item_str_func
{
560
  String tmp_value, rpad_str;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
561 562 563 564 565 566 567 568 569 570 571
public:
  Item_func_rpad(Item *arg1,Item *arg2,Item *arg3)
    :Item_str_func(arg1,arg2,arg3) {}
  String *val_str(String *);
  void fix_length_and_dec();
  const char *func_name() const { return "rpad"; }
};


class Item_func_lpad :public Item_str_func
{
572
  String tmp_value, lpad_str;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
573 574 575 576 577 578 579 580 581 582 583 584 585 586 587
public:
  Item_func_lpad(Item *arg1,Item *arg2,Item *arg3)
    :Item_str_func(arg1,arg2,arg3) {}
  String *val_str(String *);
  void fix_length_and_dec();
  const char *func_name() const { return "lpad"; }
};


class Item_func_conv :public Item_str_func
{
public:
  Item_func_conv(Item *a,Item *b,Item *c) :Item_str_func(a,b,c) {}
  const char *func_name() const { return "conv"; }
  String *val_str(String *);
serg@serg.mylan's avatar
serg@serg.mylan committed
588 589
  void fix_length_and_dec()
  {
590
    collation.set(default_charset());
591
    max_length=64;
592
    maybe_null= 1;
593
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
594 595
};

596 597 598 599 600 601 602 603

class Item_func_hex :public Item_str_func
{
  String tmp_value;
public:
  Item_func_hex(Item *a) :Item_str_func(a) {}
  const char *func_name() const { return "hex"; }
  String *val_str(String *);
serg@serg.mylan's avatar
serg@serg.mylan committed
604 605
  void fix_length_and_dec()
  {
606
    collation.set(default_charset());
bar@bar.intranet.mysql.r18.ru's avatar
bar@bar.intranet.mysql.r18.ru committed
607 608
    decimals=0;
    max_length=args[0]->max_length*2*collation.collation->mbmaxlen;
609
  }
610 611
};

serg@serg.mylan's avatar
serg@serg.mylan committed
612 613 614 615
class Item_func_unhex :public Item_str_func
{
  String tmp_value;
public:
616 617 618 619 620
  Item_func_unhex(Item *a) :Item_str_func(a) 
  { 
    /* there can be bad hex strings */
    maybe_null= 1; 
  }
serg@serg.mylan's avatar
serg@serg.mylan committed
621 622 623 624 625 626 627 628 629 630
  const char *func_name() const { return "unhex"; }
  String *val_str(String *);
  void fix_length_and_dec()
  {
    collation.set(&my_charset_bin);
    decimals=0;
    max_length=(1+args[0]->max_length)/2;
  }
};

631

bk@work.mysql.com's avatar
bk@work.mysql.com committed
632 633 634 635
class Item_func_binary :public Item_str_func
{
public:
  Item_func_binary(Item *a) :Item_str_func(a) {}
636
  String *val_str(String *a)
637
  {
638
    DBUG_ASSERT(fixed == 1);
639 640
    String *tmp=args[0]->val_str(a);
    null_value=args[0]->null_value;
641 642
    if (tmp)
      tmp->set_charset(&my_charset_bin);
643
    return tmp;
644
  }
serg@serg.mylan's avatar
serg@serg.mylan committed
645 646 647 648
  void fix_length_and_dec()
  {
    collation.set(&my_charset_bin);
    max_length=args[0]->max_length;
649
  }
650
  virtual void print(String *str, enum_query_type query_type);
651
  const char *func_name() const { return "cast_as_binary"; }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
652 653 654 655 656 657 658 659 660 661 662
};


class Item_load_file :public Item_str_func
{
  String tmp_value;
public:
  Item_load_file(Item *a) :Item_str_func(a) {}
  String *val_str(String *);
  const char *func_name() const { return "load_file"; }
  void fix_length_and_dec()
serg@serg.mylan's avatar
serg@serg.mylan committed
663
  {
664
    collation.set(&my_charset_bin, DERIVATION_COERCIBLE);
665
    maybe_null=1;
666 667
    max_length=MAX_BLOB_WIDTH;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
668 669 670 671 672 673 674 675 676 677 678 679 680 681
};


class Item_func_export_set: public Item_str_func
{
 public:
  Item_func_export_set(Item *a,Item *b,Item* c) :Item_str_func(a,b,c) {}
  Item_func_export_set(Item *a,Item *b,Item* c,Item* d) :Item_str_func(a,b,c,d) {}
  Item_func_export_set(Item *a,Item *b,Item* c,Item* d,Item* e) :Item_str_func(a,b,c,d,e) {}
  String  *val_str(String *str);
  void fix_length_and_dec();
  const char *func_name() const { return "export_set"; }
};

682
class Item_func_inet_ntoa : public Item_str_func
bk@work.mysql.com's avatar
bk@work.mysql.com committed
683 684 685 686 687 688 689
{
public:
  Item_func_inet_ntoa(Item *a) :Item_str_func(a)
    {
    }
  String* val_str(String* str);
  const char *func_name() const { return "inet_ntoa"; }
690 691 692 693 694 695
  void fix_length_and_dec() 
  { 
    decimals= 0; 
    max_length= 3 * 8 + 7; 
    maybe_null= 1;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
696
};
697 698 699

class Item_func_quote :public Item_str_func
{
700
  String tmp_value;
701 702 703 704
public:
  Item_func_quote(Item *a) :Item_str_func(a) {}
  const char *func_name() const { return "quote"; }
  String *val_str(String *);
705 706
  void fix_length_and_dec()
  {
707
    ulonglong max_result_length= (ulonglong) args[0]->max_length * 2 + 2;
Sergey Glukhov's avatar
Sergey Glukhov committed
708
    max_length= (uint32) min(max_result_length, MAX_BLOB_WIDTH);
709
    collation.set(args[0]->collation);
710
  }
711
};
monty@narttu.mysql.fi's avatar
monty@narttu.mysql.fi committed
712

713 714
class Item_func_conv_charset :public Item_str_func
{
715
  bool use_cached_value;
716
  String tmp_value;
717
public:
718
  bool safe;
719
  CHARSET_INFO *conv_charset; // keep it public
720 721 722 723 724 725 726 727 728 729 730 731 732 733 734
  Item_func_conv_charset(Item *a, CHARSET_INFO *cs) :Item_str_func(a) 
  { conv_charset= cs; use_cached_value= 0; safe= 0; }
  Item_func_conv_charset(Item *a, CHARSET_INFO *cs, bool cache_if_const) 
    :Item_str_func(a) 
  {
    DBUG_ASSERT(args[0]->fixed);
    conv_charset= cs;
    if (cache_if_const && args[0]->const_item())
    {
      uint errors= 0;
      String tmp, *str= args[0]->val_str(&tmp);
      if (!str || str_value.copy(str->ptr(), str->length(),
                                 str->charset(), conv_charset, &errors))
        null_value= 1;
      use_cached_value= 1;
735
      str_value.mark_as_const();
736 737 738 739 740 741 742 743 744 745 746 747 748 749 750
      safe= (errors == 0);
    }
    else
    {
      use_cached_value= 0;
      /*
        Conversion from and to "binary" is safe.
        Conversion to Unicode is safe.
        Other kind of conversions are potentially lossy.
      */
      safe= (args[0]->collation.collation == &my_charset_bin ||
             cs == &my_charset_bin ||
             (cs->state & MY_CS_UNICODE));
    }
  }
751 752
  String *val_str(String *);
  void fix_length_and_dec();
753
  const char *func_name() const { return "convert"; }
754
  virtual void print(String *str, enum_query_type query_type);
755 756
};

757 758 759
class Item_func_set_collation :public Item_str_func
{
public:
bar@bar.mysql.r18.ru's avatar
bar@bar.mysql.r18.ru committed
760
  Item_func_set_collation(Item *a, Item *b) :Item_str_func(a,b) {};
761
  String *val_str(String *);
762
  void fix_length_and_dec();
763
  bool eq(const Item *item, bool binary_cmp) const;
764
  const char *func_name() const { return "collate"; }
765
  enum Functype functype() const { return COLLATE_FUNC; }
766
  virtual void print(String *str, enum_query_type query_type);
767 768 769 770 771
  Item_field *filed_for_view_update()
  {
    /* this function is transparent for view updating */
    return args[0]->filed_for_view_update();
  }
772 773
};

774 775 776 777 778 779
class Item_func_charset :public Item_str_func
{
public:
  Item_func_charset(Item *a) :Item_str_func(a) {}
  String *val_str(String *);
  const char *func_name() const { return "charset"; }
780
  void fix_length_and_dec()
781
  {
782
     collation.set(system_charset_info);
783
     max_length= 64 * collation.collation->mbmaxlen; // should be enough
784
     maybe_null= 0;
785
  };
786
  table_map not_null_tables() const { return 0; }
787 788
};

789 790 791 792 793 794
class Item_func_collation :public Item_str_func
{
public:
  Item_func_collation(Item *a) :Item_str_func(a) {}
  String *val_str(String *);
  const char *func_name() const { return "collation"; }
795
  void fix_length_and_dec()
796
  {
797
     collation.set(system_charset_info);
798
     max_length= 64 * collation.collation->mbmaxlen; // should be enough
799
     maybe_null= 0;
800
  };
801
  table_map not_null_tables() const { return 0; }
802
};
803

804 805 806 807
class Item_func_crc32 :public Item_int_func
{
  String value;
public:
gkodinov/kgeorge@magare.gmz's avatar
gkodinov/kgeorge@magare.gmz committed
808
  Item_func_crc32(Item *a) :Item_int_func(a) { unsigned_flag= 1; }
809 810 811 812 813 814 815 816 817 818 819 820 821 822 823
  const char *func_name() const { return "crc32"; }
  void fix_length_and_dec() { max_length=10; }
  longlong val_int();
};

class Item_func_uncompressed_length : public Item_int_func
{
  String value;
public:
  Item_func_uncompressed_length(Item *a):Item_int_func(a){}
  const char *func_name() const{return "uncompressed_length";}
  void fix_length_and_dec() { max_length=10; }
  longlong val_int();
};

824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844
#ifdef HAVE_COMPRESS
#define ZLIB_DEPENDED_FUNCTION ;
#else
#define ZLIB_DEPENDED_FUNCTION { null_value=1; return 0; }
#endif

class Item_func_compress: public Item_str_func
{
  String buffer;
public:
  Item_func_compress(Item *a):Item_str_func(a){}
  void fix_length_and_dec(){max_length= (args[0]->max_length*120)/100+12;}
  const char *func_name() const{return "compress";}
  String *val_str(String *) ZLIB_DEPENDED_FUNCTION
};

class Item_func_uncompress: public Item_str_func
{
  String buffer;
public:
  Item_func_uncompress(Item *a): Item_str_func(a){}
845
  void fix_length_and_dec(){ maybe_null= 1; max_length= MAX_BLOB_WIDTH; }
846 847 848 849
  const char *func_name() const{return "uncompress";}
  String *val_str(String *) ZLIB_DEPENDED_FUNCTION
};

850 851 852 853 854
#define UUID_LENGTH (8+1+4+1+4+1+4+1+12)
class Item_func_uuid: public Item_str_func
{
public:
  Item_func_uuid(): Item_str_func() {}
serg@serg.mylan's avatar
serg@serg.mylan committed
855 856
  void fix_length_and_dec() {
    collation.set(system_charset_info);
857 858 859 860 861 862
    /*
       NOTE! uuid() should be changed to use 'ascii'
       charset when hex(), format(), md5(), etc, and implicit
       number-to-string conversion will use 'ascii'
    */
    max_length= UUID_LENGTH * system_charset_info->mbmaxlen;
serg@serg.mylan's avatar
serg@serg.mylan committed
863
  }
864 865 866 867
  const char *func_name() const{ return "uuid"; }
  String *val_str(String *);
};