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  • Committer: lbieber
  • Date: 2010-09-11 16:33:45 UTC
  • mfrom: (1757.1.2 build)
  • Revision ID: lbieber@orisndriz03-20100911163345-na1t8m18at9thsjl
Merge Vijay - added utf 8 tamil test case suite and test case for creating a database in tamil
Merge Brian - Small set of refactoring (includes one case of memset on a table object).

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drizzled/sql_delete.cc
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   You should have received a copy of the GNU General Public License
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   along with this program; if not, write to the Free Software
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   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA */
 
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   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
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/*
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  Delete of records and truncate of tables.
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#include "drizzled/records.h"
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#include "drizzled/internal/iocache.h"
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#include "drizzled/transaction_services.h"
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#include "drizzled/filesort.h"
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namespace drizzled
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{
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  end of dispatch_command().
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*/
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44
 
46
 
bool delete_query(Session *session, TableList *table_list, COND *conds,
 
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bool mysql_delete(Session *session, TableList *table_list, COND *conds,
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                  SQL_LIST *order, ha_rows limit, uint64_t,
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                  bool reset_auto_increment)
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{
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  ha_rows       deleted= 0;
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  uint32_t usable_index= MAX_KEY;
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  Select_Lex   *select_lex= &session->lex->select_lex;
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  Session::killed_state_t killed_status= Session::NOT_KILLED;
 
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  Session::killed_state killed_status= Session::NOT_KILLED;
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  if (session->openTablesLock(table_list))
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  {
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  session->set_proc_info("init");
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  table->map=1;
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74
 
  if (prepare_delete(session, table_list, &conds))
75
 
  {
76
 
    DRIZZLE_DELETE_DONE(1, 0);
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    return true;
78
 
  }
 
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  if (mysql_prepare_delete(session, table_list, &conds))
 
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    goto err;
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  /* check ORDER BY even if it can be ignored */
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  if (order && order->elements)
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      if (select_lex->setup_ref_array(session, order->elements) ||
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          setup_order(session, select_lex->ref_pointer_array, &tables,
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                    fields, all_fields, (Order*) order->first))
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      {
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        delete select;
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        free_underlaid_joins(session, &session->lex->select_lex);
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        DRIZZLE_DELETE_DONE(1, 0);
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98
 
        return true;
99
 
      }
 
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                    fields, all_fields, (order_st*) order->first))
 
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    {
 
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      delete select;
 
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      free_underlaid_joins(session, &session->lex->select_lex);
 
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      goto err;
 
93
    }
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  }
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  const_cond= (!conds || conds->const_item());
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  table->quick_keys.reset();            // Can't use 'only index'
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  select= optimizer::make_select(table, 0, 0, conds, 0, &error);
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  if (error)
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  {
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    DRIZZLE_DELETE_DONE(1, 0);
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    return true;
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  }
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    goto err;
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  if ((select && select->check_quick(session, false, limit)) || !limit)
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  {
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    delete select;
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    free_underlaid_joins(session, select_lex);
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    session->row_count_func= 0;
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    if (session->is_error())
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      return true;
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    DRIZZLE_DELETE_DONE(0, 0);
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    /**
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     * Resetting the Diagnostic area to prevent
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     * lp bug# 439719
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     */
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    session->main_da.reset_diagnostics_area();
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    session->my_ok((ha_rows) session->rowCount());
 
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    session->my_ok((ha_rows) session->row_count_func);
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    /*
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      We don't need to call reset_auto_increment in this case, because
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      mysql_truncate always gives a NULL conds argument, hence we never
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    ha_rows examined_rows;
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    if ((!select || table->quick_keys.none()) && limit != HA_POS_ERROR)
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      usable_index= optimizer::get_index_for_order(table, (Order*)(order->first), limit);
 
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      usable_index= optimizer::get_index_for_order(table, (order_st*)(order->first), limit);
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    if (usable_index == MAX_KEY)
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    {
210
 
      FileSort filesort(*session);
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      table->sort.io_cache= new internal::IO_CACHE;
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213
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      if (not (sortorder= make_unireg_sortorder((Order*) order->first, &length, NULL)) ||
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          (table->sort.found_records = filesort.run(table, sortorder, length,
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                                                    select, HA_POS_ERROR, 1,
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                                                    examined_rows)) == HA_POS_ERROR)
 
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      if (!(sortorder= make_unireg_sortorder((order_st*) order->first,
 
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                                             &length, NULL)) ||
 
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          (table->sort.found_records = filesort(session, table, sortorder, length,
 
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                                                select, HA_POS_ERROR, 1,
 
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                                                &examined_rows))
 
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          == HA_POS_ERROR)
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      {
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        delete select;
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        free_underlaid_joins(session, &session->lex->select_lex);
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222
 
        DRIZZLE_DELETE_DONE(1, 0);
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        return true;
 
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        goto err;
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      }
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      /*
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        Filesort has already found and selected the rows we want to delete,
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  {
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    delete select;
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    free_underlaid_joins(session, select_lex);
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    DRIZZLE_DELETE_DONE(1, 0);
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    return true;
 
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    goto err;
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  }
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  if (usable_index==MAX_KEY)
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  {
246
 
    if ((error= info.init_read_record(session,table,select,1,1)))
247
 
    {
248
 
      table->print_error(error, MYF(0));
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      delete select;
250
 
      free_underlaid_joins(session, select_lex);
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      return true;
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    }
 
232
    info.init_read_record(session,table,select,1,1);
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  }
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  else
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  {
256
 
    if ((error= info.init_read_record_idx(session, table, 1, usable_index)))
257
 
    {
258
 
      table->print_error(error, MYF(0));
259
 
      delete select;
260
 
      free_underlaid_joins(session, select_lex);
261
 
      return true;
262
 
    }
 
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    info.init_read_record_idx(session, table, 1, usable_index);
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  }
264
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265
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  session->set_proc_info("updating");
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267
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  table->mark_columns_needed_for_delete();
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  while (!(error=info.read_record(&info)) && !session->getKilled() &&
 
243
  while (!(error=info.read_record(&info)) && !session->killed &&
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         ! session->is_error())
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  {
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    // session->is_error() is tested to disallow delete row on error
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    else
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      table->cursor->unlock_row();  // Row failed selection, release lock on it
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  }
302
 
  killed_status= session->getKilled();
 
276
  killed_status= session->killed;
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  if (killed_status != Session::NOT_KILLED || session->is_error())
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    error= 1;                                   // Aborted
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347
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     * lp bug# 439719
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     */
349
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    session->main_da.reset_diagnostics_area();    
350
 
    session->my_ok((ha_rows) session->rowCount());
 
324
    session->my_ok((ha_rows) session->row_count_func);
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  }
352
326
  session->status_var.deleted_row_count+= deleted;
353
 
 
354
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  return (error >= 0 || session->is_error());
 
328
 
 
329
err:
 
330
  DRIZZLE_DELETE_DONE(1, 0);
 
331
  return true;
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}
356
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357
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359
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  Prepare items in DELETE statement
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361
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  SYNOPSIS
362
 
    prepare_delete()
 
339
    mysql_prepare_delete()
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    session                     - thread handler
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    table_list          - global/local table list
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    conds               - conditions
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    false OK
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    true  error
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*/
371
 
int prepare_delete(Session *session, TableList *table_list, Item **conds)
 
348
int mysql_prepare_delete(Session *session, TableList *table_list, Item **conds)
372
349
{
373
350
  Select_Lex *select_lex= &session->lex->select_lex;
374
351
 
392
369
 
393
370
  if (select_lex->inner_refs_list.elements &&
394
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    fix_inner_refs(session, all_fields, select_lex, select_lex->ref_pointer_array))
395
 
    return(true);
 
372
    return(-1);
396
373
 
397
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  return(false);
398
375
}
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  This will work even if the .ISM and .ISD tables are destroyed
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*/
409
386
 
410
 
bool truncate(Session& session, TableList *table_list)
 
387
bool mysql_truncate(Session& session, TableList *table_list)
411
388
{
412
389
  bool error;
413
390
  TransactionServices &transaction_services= TransactionServices::singleton();
415
392
  uint64_t save_options= session.options;
416
393
  table_list->lock_type= TL_WRITE;
417
394
  session.options&= ~(OPTION_BEGIN | OPTION_NOT_AUTOCOMMIT);
418
 
  init_select(session.lex);
419
 
  error= delete_query(&session, table_list, (COND*) 0, (SQL_LIST*) 0,
 
395
  mysql_init_select(session.lex);
 
396
  error= mysql_delete(&session, table_list, (COND*) 0, (SQL_LIST*) 0,
420
397
                      HA_POS_ERROR, 0L, true);
421
398
  /*
422
399
    Safety, in case the engine ignored ha_enable_transaction(false)
423
400
    above. Also clears session->transaction.*.
424
401
  */
425
 
  error= transaction_services.autocommitOrRollback(session, error);
 
402
  error= transaction_services.autocommitOrRollback(&session, error);
426
403
  session.options= save_options;
427
404
 
428
405
  return error;