field_conv.cc 14.5 KB
Newer Older
unknown's avatar
unknown committed
1
/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
unknown's avatar
unknown committed
2

unknown's avatar
unknown committed
3 4 5 6
   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.
unknown's avatar
unknown committed
7

unknown's avatar
unknown committed
8 9 10 11
   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.
unknown's avatar
unknown committed
12

unknown's avatar
unknown committed
13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114
   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 */


/*
 Functions to copy data to or from fields
 This could be done with a single short function but opencooding this
 gives much more speed.
 */

#include "mysql_priv.h"
#include <m_ctype.h>

static void do_field_eq(Copy_field *copy)
{
  memcpy(copy->to_ptr,copy->from_ptr,copy->from_length);
}

static void do_field_1(Copy_field *copy)
{
  copy->to_ptr[0]=copy->from_ptr[0];
}

static void do_field_2(Copy_field *copy)
{
  copy->to_ptr[0]=copy->from_ptr[0];
  copy->to_ptr[1]=copy->from_ptr[1];
}

static void do_field_3(Copy_field *copy)
{
  copy->to_ptr[0]=copy->from_ptr[0];
  copy->to_ptr[1]=copy->from_ptr[1];
  copy->to_ptr[2]=copy->from_ptr[2];
}

static void do_field_4(Copy_field *copy)
{
  copy->to_ptr[0]=copy->from_ptr[0];
  copy->to_ptr[1]=copy->from_ptr[1];
  copy->to_ptr[2]=copy->from_ptr[2];
  copy->to_ptr[3]=copy->from_ptr[3];
}

static void do_field_6(Copy_field *copy)
{						// For blob field
  copy->to_ptr[0]=copy->from_ptr[0];
  copy->to_ptr[1]=copy->from_ptr[1];
  copy->to_ptr[2]=copy->from_ptr[2];
  copy->to_ptr[3]=copy->from_ptr[3];
  copy->to_ptr[4]=copy->from_ptr[4];
  copy->to_ptr[5]=copy->from_ptr[5];
}

static void do_field_8(Copy_field *copy)
{
  copy->to_ptr[0]=copy->from_ptr[0];
  copy->to_ptr[1]=copy->from_ptr[1];
  copy->to_ptr[2]=copy->from_ptr[2];
  copy->to_ptr[3]=copy->from_ptr[3];
  copy->to_ptr[4]=copy->from_ptr[4];
  copy->to_ptr[5]=copy->from_ptr[5];
  copy->to_ptr[6]=copy->from_ptr[6];
  copy->to_ptr[7]=copy->from_ptr[7];
}


static void do_field_to_null_str(Copy_field *copy)
{
  if (*copy->from_null_ptr & copy->from_bit)
  {
    bzero(copy->to_ptr,copy->from_length);
    copy->to_null_ptr[0]=1;			// Always bit 1
  }
  else
  {
    copy->to_null_ptr[0]=0;
    memcpy(copy->to_ptr,copy->from_ptr,copy->from_length);
  }
}


static void do_outer_field_to_null_str(Copy_field *copy)
{
  if (*copy->null_row ||
      copy->from_null_ptr && (*copy->from_null_ptr & copy->from_bit))
  {
    bzero(copy->to_ptr,copy->from_length);
    copy->to_null_ptr[0]=1;			// Always bit 1
  }
  else
  {
    copy->to_null_ptr[0]=0;
    memcpy(copy->to_ptr,copy->from_ptr,copy->from_length);
  }
}


bool
set_field_to_null(Field *field)
{
115
  if (field->real_maybe_null())
unknown's avatar
unknown committed
116 117 118
  {
    field->set_null();
    field->reset();
119
    return 0;
unknown's avatar
unknown committed
120
  }
121 122 123
  field->reset();
  if (current_thd->count_cuted_fields)
  {
124
    field->set_warning(MYSQL_ERROR::WARN_LEVEL_WARN,ER_WARN_DATA_TRUNCATED);
125 126 127 128 129
    return 0;
  }
  if (!current_thd->no_errors)
    my_printf_error(ER_BAD_NULL_ERROR,ER(ER_BAD_NULL_ERROR),MYF(0),
		    field->field_name);
130 131 132 133
  return 1;
}


134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151
/*
  Set field to NULL or TIMESTAMP or to next auto_increment number

  SYNOPSIS
    set_field_to_null_with_conversions()
    field		Field to update
    no_conversion	Set to 1 if we should return 1 if field can't
			take null values.
			If set to 0 we will do store the 'default value'
			if the field is a special field. If not we will
			give an error.

  RETURN VALUES
    0		Field could take 0 or an automatic conversion was used
    1		Field could not take NULL and no conversion was used.
		If no_conversion was not set, an error message is printed
*/

152
bool
153
set_field_to_null_with_conversions(Field *field, bool no_conversions)
154 155
{
  if (field->real_maybe_null())
unknown's avatar
unknown committed
156
  {
157
    field->set_null();
unknown's avatar
unknown committed
158
    field->reset();
159
    return 0;
unknown's avatar
unknown committed
160
  }
161 162
  if (no_conversions)
    return 1;
163 164 165 166 167 168 169 170 171 172 173 174 175 176 177

  /*
    Check if this is a special type, which will get a special walue
    when set to NULL
  */
  if (field->type() == FIELD_TYPE_TIMESTAMP)
  {
    ((Field_timestamp*) field)->set_time();
    return 0;					// Ok to set time to NULL
  }
  field->reset();
  if (field == field->table->next_number_field)
    return 0;					// field is set in handler.cc
  if (current_thd->count_cuted_fields)
  {
178
    field->set_warning(MYSQL_ERROR::WARN_LEVEL_WARN,ER_WARN_NULL_TO_NOTNULL);
179 180 181 182 183 184
    return 0;
  }
  if (!current_thd->no_errors)
    my_printf_error(ER_BAD_NULL_ERROR,ER(ER_BAD_NULL_ERROR),MYF(0),
		    field->field_name);
  return 1;
unknown's avatar
unknown committed
185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227
}


static void do_skip(Copy_field *copy __attribute__((unused)))
{
}


static void do_copy_null(Copy_field *copy)
{
  if (*copy->from_null_ptr & copy->from_bit)
  {
    *copy->to_null_ptr|=copy->to_bit;
    copy->to_field->reset();
  }
  else
  {
    *copy->to_null_ptr&= ~copy->to_bit;
    (copy->do_copy2)(copy);
  }
}


static void do_outer_field_null(Copy_field *copy)
{
  if (*copy->null_row ||
      copy->from_null_ptr && (*copy->from_null_ptr & copy->from_bit))
  {
    *copy->to_null_ptr|=copy->to_bit;
    copy->to_field->reset();
  }
  else
  {
    *copy->to_null_ptr&= ~copy->to_bit;
    (copy->do_copy2)(copy);
  }
}


static void do_copy_not_null(Copy_field *copy)
{
  if (*copy->from_null_ptr & copy->from_bit)
  {
228 229
    copy->to_field->set_warning(MYSQL_ERROR::WARN_LEVEL_WARN,
      ER_WARN_DATA_TRUNCATED);
unknown's avatar
unknown committed
230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275
    copy->to_field->reset();
  }
  else
    (copy->do_copy2)(copy);
}


static void do_copy_maybe_null(Copy_field *copy)
{
  *copy->to_null_ptr&= ~copy->to_bit;
  (copy->do_copy2)(copy);
}

/* timestamp and next_number has special handling in case of NULL values */

static void do_copy_timestamp(Copy_field *copy)
{
  if (*copy->from_null_ptr & copy->from_bit)
  {
    ((Field_timestamp*) copy->to_field)->set_time();// Same as set_field_to_null
  }
  else
    (copy->do_copy2)(copy);
}


static void do_copy_next_number(Copy_field *copy)
{
  if (*copy->from_null_ptr & copy->from_bit)
    copy->to_field->reset();			// Same as set_field_to_null
  else
    (copy->do_copy2)(copy);
}


static void do_copy_blob(Copy_field *copy)
{
  ulong length=((Field_blob*) copy->from_field)->get_length();
  ((Field_blob*) copy->to_field)->store_length(length);
  memcpy_fixed(copy->to_ptr,copy->from_ptr,sizeof(char*));
}

static void do_conv_blob(Copy_field *copy)
{
  copy->from_field->val_str(&copy->tmp,&copy->tmp);
  ((Field_blob *) copy->to_field)->store(copy->tmp.ptr(),
276 277
					 copy->tmp.length(),
					 copy->tmp.charset());
unknown's avatar
unknown committed
278 279 280 281 282 283 284
}

/* Save blob in copy->tmp for GROUP BY */

static void do_save_blob(Copy_field *copy)
{
  char buff[MAX_FIELD_WIDTH];
285
  String res(buff,sizeof(buff),copy->tmp.charset());
unknown's avatar
unknown committed
286 287 288
  copy->from_field->val_str(&res,&res);
  copy->tmp.copy(res);
  ((Field_blob *) copy->to_field)->store(copy->tmp.ptr(),
289 290
					 copy->tmp.length(),
					 copy->tmp.charset());
unknown's avatar
unknown committed
291 292 293 294 295 296
}


static void do_field_string(Copy_field *copy)
{
  char buff[MAX_FIELD_WIDTH];
297
  copy->tmp.set_quick(buff,sizeof(buff),copy->tmp.charset());
unknown's avatar
unknown committed
298
  copy->from_field->val_str(&copy->tmp,&copy->tmp);
299
  copy->to_field->store(copy->tmp.c_ptr_quick(),copy->tmp.length(),copy->tmp.charset());
unknown's avatar
unknown committed
300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325
}


static void do_field_int(Copy_field *copy)
{
  longlong value=copy->from_field->val_int();
  copy->to_field->store(value);
}

static void do_field_real(Copy_field *copy)
{
  double value=copy->from_field->val_real();
  copy->to_field->store(value);
}


static void do_cut_string(Copy_field *copy)
{						// Shorter string field
  memcpy(copy->to_ptr,copy->from_ptr,copy->to_length);

  /* Check if we loosed any important characters */
  char *ptr,*end;
  for (ptr=copy->from_ptr+copy->to_length,end=copy->from_ptr+copy->from_length ;
       ptr != end ;
       ptr++)
  {
326
    if (!my_isspace(system_charset_info, *ptr))	// QQ: ucs incompatible
unknown's avatar
unknown committed
327
    {
328 329
      copy->to_field->set_warning(MYSQL_ERROR::WARN_LEVEL_WARN,
        ER_WARN_DATA_TRUNCATED);
unknown's avatar
unknown committed
330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348
      break;
    }
  }
}


static void do_expand_string(Copy_field *copy)
{
  memcpy(copy->to_ptr,copy->from_ptr,copy->from_length);
  bfill(copy->to_ptr+copy->from_length,copy->to_length-copy->from_length,' ');
}

static void do_varstring(Copy_field *copy)
{
  uint length=uint2korr(copy->from_ptr);
  if (length > copy->to_length-2)
  {
    length=copy->to_length-2;
    if (current_thd->count_cuted_fields)
349 350
      copy->to_field->set_warning(MYSQL_ERROR::WARN_LEVEL_WARN,
      ER_WARN_DATA_TRUNCATED);
unknown's avatar
unknown committed
351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491
  }
  int2store(copy->to_ptr,length);
  memcpy(copy->to_ptr+2, copy->from_ptr,length);
}

/***************************************************************************
** The different functions that fills in a Copy_field class
***************************************************************************/

/*
  copy of field to maybe null string.
  If field is null then the all bytes are set to 0.
  if field is not null then the first byte is set to 1 and the rest of the
  string is the field value.
  The 'to' buffer should have a size of field->pack_length()+1
*/

void Copy_field::set(char *to,Field *from)
{
  from_ptr=from->ptr;
  to_ptr=to;
  from_length=from->pack_length();
  if (from->maybe_null())
  {
    from_null_ptr=from->null_ptr;
    from_bit=	  from->null_bit;
    to_ptr[0]=	  1;				// Null as default value
    to_null_ptr=  (uchar*) to_ptr++;
    to_bit=	  1;
    if (from->table->maybe_null)
    {
      null_row=   &from->table->null_row;
      do_copy=	  do_outer_field_to_null_str;
    }
    else
      do_copy=	  do_field_to_null_str;
  }
  else
  {
    to_null_ptr=  0;				// For easy debugging
    do_copy=	  do_field_eq;
  }
}



void Copy_field::set(Field *to,Field *from,bool save)
{
  if (to->type() == FIELD_TYPE_NULL)
  {
    to_null_ptr=0;				// For easy debugging
    to_ptr=0;
    do_copy=do_skip;
    return;
  }
  from_field=from;
  to_field=to;
  from_ptr=from->ptr;
  from_length=from->pack_length();
  to_ptr=  to->ptr;
  to_length=to_field->pack_length();

  // set up null handling
  from_null_ptr=to_null_ptr=0;
  if (from->maybe_null())
  {
    from_null_ptr=	from->null_ptr;
    from_bit=		from->null_bit;
    if (to_field->real_maybe_null())
    {
      to_null_ptr=	to->null_ptr;
      to_bit=		to->null_bit;
      if (from_null_ptr)
	do_copy=	do_copy_null;
      else
      {
	null_row=	&from->table->null_row;
	do_copy=	do_outer_field_null;
      }
    }
    else
      do_copy=do_copy_not_null;
  }
  else if (to_field->real_maybe_null())
  {
    to_null_ptr=	to->null_ptr;
    to_bit=		to->null_bit;
    if (to_field->type() == FIELD_TYPE_TIMESTAMP)
      do_copy=do_copy_timestamp;		// Automatic timestamp
    else if (to_field == to_field->table->next_number_field)
      do_copy=do_copy_next_number;
    else
      do_copy=do_copy_maybe_null;
  }
  else
   do_copy=0;

  if ((to->flags & BLOB_FLAG) && save)
    do_copy2= do_save_blob;
  else
    do_copy2= get_copy_func(to,from);
  if (!do_copy)					// Not null
    do_copy=do_copy2;
}


void (*Copy_field::get_copy_func(Field *to,Field *from))(Copy_field*)
{
  if (to->flags & BLOB_FLAG)
  {
    if (!(from->flags & BLOB_FLAG))
      return do_conv_blob;
    if (from_length != to_length ||
	to->table->db_low_byte_first != from->table->db_low_byte_first)
    {
      // Correct pointer to point at char pointer
      to_ptr+=to_length - to->table->blob_ptr_size;
      from_ptr+=from_length- from->table->blob_ptr_size;
      return do_copy_blob;
    }
  }
  else
  {
    // Check if identical fields
    if (from->result_type() == STRING_RESULT)
    {
      if (to->real_type() != from->real_type() ||
	  to->table->db_low_byte_first != from->table->db_low_byte_first)
      {
	if (from->real_type() == FIELD_TYPE_ENUM ||
	    from->real_type() == FIELD_TYPE_SET)
	  if (to->result_type() != STRING_RESULT)
	    return do_field_int;		// Convert SET to number
	return do_field_string;
      }
      if (to->real_type() == FIELD_TYPE_ENUM ||
	  to->real_type() == FIELD_TYPE_SET)
      {
	if (!to->eq_def(from))
	  return do_field_string;
      }
unknown's avatar
unknown committed
492 493
      else if (to->charset() != from->charset())
	return do_field_string;
unknown's avatar
unknown committed
494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561
      else if (to->real_type() == FIELD_TYPE_VAR_STRING && to_length !=
	       from_length)
	return do_varstring;
      else if (to_length < from_length)
	return do_cut_string;
      else if (to_length > from_length)
	return do_expand_string;
    }
    else if (to->real_type() != from->real_type() ||
	     to_length != from_length ||
	     to->table->db_low_byte_first != from->table->db_low_byte_first)
    {
      if (to->real_type() == FIELD_TYPE_DECIMAL ||
	  to->result_type() == STRING_RESULT)
	return do_field_string;
      if (to->result_type() == INT_RESULT)
	return do_field_int;
      return do_field_real;
    }
    else
    {
      if (!to->eq_def(from) ||
	  to->table->db_low_byte_first != from->table->db_low_byte_first)
      {
	if (to->real_type() == FIELD_TYPE_DECIMAL)
	  return do_field_string;
	if (to->result_type() == INT_RESULT)
	  return do_field_int;
	else
	  return do_field_real;
      }
    }
  }
    /* Eq fields */
  switch (to_length) {
  case 1: return do_field_1;
  case 2: return do_field_2;
  case 3: return do_field_3;
  case 4: return do_field_4;
  case 6: return do_field_6;
  case 8: return do_field_8;
  }
  return do_field_eq;
}


/* Simple quick field convert that is called on insert */

void field_conv(Field *to,Field *from)
{
  if (to->real_type() == from->real_type())
  {
    if (to->pack_length() == from->pack_length() &&
	to->real_type() != FIELD_TYPE_ENUM &&
	to->real_type() != FIELD_TYPE_SET &&
	to->table->db_low_byte_first == from->table->db_low_byte_first)
    {						// Identical fields
      memcpy(to->ptr,from->ptr,to->pack_length());
      return;
    }
  }
  if (to->type() == FIELD_TYPE_BLOB)
  {						// Be sure the value is stored
    Field_blob *blob=(Field_blob*) to;
    from->val_str(&blob->value,&blob->value);
    if (!blob->value.is_alloced() &&
	from->real_type() != FIELD_TYPE_STRING)
      blob->value.copy();
unknown's avatar
unknown committed
562
    blob->store(blob->value.ptr(),blob->value.length(),to->charset());
unknown's avatar
unknown committed
563 564 565 566 567 568 569 570 571
    return;
  }
  if ((from->result_type() == STRING_RESULT &&
       (to->result_type() == STRING_RESULT ||
	(from->real_type() != FIELD_TYPE_ENUM &&
	 from->real_type() != FIELD_TYPE_SET))) ||
      to->type() == FIELD_TYPE_DECIMAL)
  {
    char buff[MAX_FIELD_WIDTH];
572
    String result(buff,sizeof(buff),from->charset());
unknown's avatar
unknown committed
573
    from->val_str(&result,&result);
unknown's avatar
unknown committed
574
    to->store(result.c_ptr_quick(),result.length(),to->charset());
575
    // QQ: what to do if "from" and "to" are of dirrent charsets?
unknown's avatar
unknown committed
576 577 578 579 580 581
  }
  else if (from->result_type() == REAL_RESULT)
    to->store(from->val_real());
  else
    to->store(from->val_int());
}