375
382
/***************************************************************************
383
Delete multiple tables from join
384
***************************************************************************/
386
#define MEM_STRIP_BUF_SIZE current_session->variables.sortbuff_size
388
extern "C" int refpos_order_cmp(void* arg, const void *a,const void *b)
390
handler *file= (handler*)arg;
391
return file->cmp_ref((const unsigned char*)a, (const unsigned char*)b);
395
make delete specific preparation and checks after opening tables
398
mysql_multi_delete_prepare()
399
session thread handler
406
int mysql_multi_delete_prepare(Session *session)
408
LEX *lex= session->lex;
409
TableList *aux_tables= (TableList *)lex->auxiliary_table_list.first;
410
TableList *target_tbl;
414
setup_tables() need for VIEWs. JOIN::prepare() will not do it second
417
lex->query_tables also point on local list of DELETE Select_Lex
419
if (setup_tables_and_check_access(session, &session->lex->select_lex.context,
420
&session->lex->select_lex.top_join_list,
422
&lex->select_lex.leaf_tables, false))
427
Multi-delete can't be constructed over-union => we always have
428
single SELECT on top and have to check underlying SELECTs of it
430
lex->select_lex.exclude_from_table_unique_test= true;
431
/* Fix tables-to-be-deleted-from list to point at opened tables */
432
for (target_tbl= (TableList*) aux_tables;
434
target_tbl= target_tbl->next_local)
436
target_tbl->table= target_tbl->correspondent_table->table;
437
assert(target_tbl->table);
440
Check that table from which we delete is not used somewhere
441
inside subqueries/view.
444
TableList *duplicate;
445
if ((duplicate= unique_table(session, target_tbl->correspondent_table,
446
lex->query_tables, 0)))
448
update_non_unique_table_error(target_tbl->correspondent_table,
449
"DELETE", duplicate);
458
multi_delete::multi_delete(TableList *dt, uint32_t num_of_tables_arg)
459
: delete_tables(dt), deleted(0), found(0),
460
num_of_tables(num_of_tables_arg), error(0),
461
do_delete(0), transactional_tables(0), normal_tables(0), error_handled(0)
463
tempfiles= (Unique **) sql_calloc(sizeof(Unique *) * num_of_tables);
468
multi_delete::prepare(List<Item> &, Select_Lex_Unit *u)
473
session->set_proc_info("deleting from main table");
479
multi_delete::initialize_tables(JOIN *join)
482
Unique **tempfiles_ptr;
485
if ((session->options & OPTION_SAFE_UPDATES) && error_if_full_join(join))
488
table_map tables_to_delete_from=0;
489
for (walk= delete_tables; walk; walk= walk->next_local)
490
tables_to_delete_from|= walk->table->map;
493
delete_while_scanning= 1;
494
for (JOIN_TAB *tab=join->join_tab, *end=join->join_tab+join->tables;
498
if (tab->table->map & tables_to_delete_from)
500
/* We are going to delete from this table */
501
Table *tbl=walk->table=tab->table;
502
walk= walk->next_local;
503
/* Don't use KEYREAD optimization on this table */
505
/* Don't use record cache */
507
tbl->covering_keys.clear_all();
508
if (tbl->file->has_transactions())
509
transactional_tables= 1;
512
tbl->prepare_for_position();
513
tbl->mark_columns_needed_for_delete();
515
else if ((tab->type != JT_SYSTEM && tab->type != JT_CONST) &&
516
walk == delete_tables)
519
We are not deleting from the table we are scanning. In this
520
case send_data() shouldn't delete any rows a we may touch
521
the rows in the deleted table many times
523
delete_while_scanning= 0;
527
tempfiles_ptr= tempfiles;
528
if (delete_while_scanning)
530
table_being_deleted= delete_tables;
531
walk= walk->next_local;
533
for (;walk ;walk= walk->next_local)
535
Table *table=walk->table;
536
*tempfiles_ptr++= new Unique (refpos_order_cmp,
537
(void *) table->file,
538
table->file->ref_length,
541
return(session->is_fatal_error != 0);
545
multi_delete::~multi_delete()
547
for (table_being_deleted= delete_tables;
549
table_being_deleted= table_being_deleted->next_local)
551
Table *table= table_being_deleted->table;
555
for (uint32_t counter= 0; counter < num_of_tables; counter++)
557
if (tempfiles[counter])
558
delete tempfiles[counter];
563
bool multi_delete::send_data(List<Item> &)
565
int secure_counter= delete_while_scanning ? -1 : 0;
566
TableList *del_table;
569
for (del_table= delete_tables;
571
del_table= del_table->next_local, secure_counter++)
573
Table *table= del_table->table;
575
/* Check if we are using outer join and we didn't find the row */
576
if (table->status & (STATUS_NULL_ROW | STATUS_DELETED))
579
table->file->position(table->record[0]);
582
if (secure_counter < 0)
584
/* We are scanning the current table */
585
assert(del_table == table_being_deleted);
586
table->status|= STATUS_DELETED;
587
if (!(error=table->file->ha_delete_row(table->record[0])))
590
if (!table->file->has_transactions())
591
session->transaction.stmt.modified_non_trans_table= true;
595
table->file->print_error(error,MYF(0));
601
error=tempfiles[secure_counter]->unique_add((char*) table->file->ref);
604
error= 1; // Fatal error
613
void multi_delete::send_error(uint32_t errcode,const char *err)
617
/* First send error what ever it is ... */
618
my_message(errcode, err, MYF(0));
624
void multi_delete::abort()
628
/* the error was handled or nothing deleted and no side effects return */
630
(!session->transaction.stmt.modified_non_trans_table && !deleted))
634
If rows from the first table only has been deleted and it is
635
transactional, just do rollback.
636
The same if all tables are transactional, regardless of where we are.
637
In all other cases do attempt deletes ...
639
if (do_delete && normal_tables &&
640
(table_being_deleted != delete_tables ||
641
!table_being_deleted->table->file->has_transactions()))
644
We have to execute the recorded do_deletes() and write info into the
649
assert(error_handled);
653
if (session->transaction.stmt.modified_non_trans_table)
655
session->transaction.all.modified_non_trans_table= true;
663
Do delete from other tables.
669
int multi_delete::do_deletes()
671
int local_error= 0, counter= 0, tmp_error;
676
do_delete= 0; // Mark called
680
table_being_deleted= (delete_while_scanning ? delete_tables->next_local :
683
for (; table_being_deleted;
684
table_being_deleted= table_being_deleted->next_local, counter++)
686
ha_rows last_deleted= deleted;
687
Table *table = table_being_deleted->table;
688
if (tempfiles[counter]->get(table))
695
init_read_record(&info,session,table,NULL,0,1);
697
Ignore any rows not found in reference tables as they may already have
698
been deleted by foreign key handling
700
info.ignore_not_found_rows= 1;
701
will_batch= !table->file->start_bulk_delete();
702
while (!(local_error=info.read_record(&info)) && !session->killed)
704
if ((local_error=table->file->ha_delete_row(table->record[0])))
706
table->file->print_error(local_error,MYF(0));
711
if (will_batch && (tmp_error= table->file->end_bulk_delete()))
715
local_error= tmp_error;
716
table->file->print_error(local_error,MYF(0));
719
if (last_deleted != deleted && !table->file->has_transactions())
720
session->transaction.stmt.modified_non_trans_table= true;
721
end_read_record(&info);
722
if (session->killed && !local_error)
724
if (local_error == -1) // End of file
732
Send ok to the client
738
bool multi_delete::send_eof()
740
Session::killed_state killed_status= Session::NOT_KILLED;
741
session->set_proc_info("deleting from reference tables");
743
/* Does deletes for the last n - 1 tables, returns 0 if ok */
744
int local_error= do_deletes(); // returns 0 if success
746
/* compute a total error to know if something failed */
747
local_error= local_error || error;
748
killed_status= (local_error == 0)? Session::NOT_KILLED : session->killed;
749
/* reset used flags */
750
session->set_proc_info("end");
752
if ((local_error == 0) || session->transaction.stmt.modified_non_trans_table)
754
if (session->transaction.stmt.modified_non_trans_table)
755
session->transaction.all.modified_non_trans_table= true;
757
if (local_error != 0)
758
error_handled= true; // to force early leave from ::send_error()
762
session->row_count_func= deleted;
763
session->my_ok((ha_rows) session->row_count_func);
769
/***************************************************************************
377
771
****************************************************************************/
380
774
Optimize delete of all rows by doing a full generate of the table
381
775
This will work even if the .ISM and .ISD tables are destroyed
777
dont_send_ok should be set if:
778
- We should always wants to generate the table (even if the table type
779
normally can't safely do this.
780
- We don't want an ok to be sent to the end user.
781
- We don't want to log the truncate command
782
- If we want to have a name lock on the table on exit without errors.
384
bool mysql_truncate(Session& session, TableList *table_list)
785
bool mysql_truncate(Session *session, TableList *table_list, bool dont_send_ok)
787
HA_CREATE_INFO create_info;
788
char path[FN_REFLEN];
387
TransactionServices &transaction_services= TransactionServices::singleton();
389
uint64_t save_options= session.options;
791
uint32_t path_length;
794
memset(&create_info, 0, sizeof(create_info));
795
/* If it is a temporary table, close and regenerate it */
796
if (!dont_send_ok && (table= find_temporary_table(session, table_list)))
798
StorageEngine *table_type= table->s->db_type();
799
TABLE_SHARE *share= table->s;
801
if (!table_type->check_flag(HTON_BIT_CAN_RECREATE))
804
table->file->info(HA_STATUS_AUTO | HA_STATUS_NO_LOCK);
806
close_temporary_table(session, table, 0, 0); // Don't free share
807
ha_create_table(session, share->normalized_path.str,
808
share->db.str, share->table_name.str, &create_info, 1);
809
// We don't need to call invalidate() because this table is not in cache
810
if ((error= (int) !(open_temporary_table(session, share->path.str,
812
share->table_name.str, 1,
814
(void) rm_temporary_table(table_type, path);
815
free_table_share(share);
818
If we return here we will not have logged the truncation to the bin log
819
and we will not my_ok() to the client.
824
path_length= build_table_filename(path, sizeof(path), table_list->db,
825
table_list->table_name, "", 0);
830
pthread_mutex_lock(&LOCK_open);
831
error= ha_create_table(session, path, table_list->db, table_list->table_name,
833
pthread_mutex_unlock(&LOCK_open);
841
TRUNCATE must always be statement-based binlogged (not row-based) so
842
we don't test current_stmt_binlog_row_based.
844
write_bin_log(session, true, session->query, session->query_length);
845
session->my_ok(); // This should return record count
847
pthread_mutex_lock(&LOCK_open);
848
unlock_table_name(session, table_list);
849
pthread_mutex_unlock(&LOCK_open);
853
pthread_mutex_lock(&LOCK_open);
854
unlock_table_name(session, table_list);
855
pthread_mutex_unlock(&LOCK_open);
860
/* Probably InnoDB table */
861
uint64_t save_options= session->options;
390
862
table_list->lock_type= TL_WRITE;
391
session.options&= ~(OPTION_BEGIN | OPTION_NOT_AUTOCOMMIT);
392
mysql_init_select(session.lex);
393
error= mysql_delete(&session, table_list, (COND*) 0, (SQL_LIST*) 0,
863
session->options&= ~(OPTION_BEGIN | OPTION_NOT_AUTOCOMMIT);
864
ha_enable_transaction(session, false);
865
mysql_init_select(session->lex);
866
error= mysql_delete(session, table_list, (COND*) 0, (SQL_LIST*) 0,
394
867
HA_POS_ERROR, 0L, true);
868
ha_enable_transaction(session, true);
396
870
Safety, in case the engine ignored ha_enable_transaction(false)
397
871
above. Also clears session->transaction.*.
399
error= transaction_services.ha_autocommit_or_rollback(&session, error);
400
session.options= save_options;
873
error= ha_autocommit_or_rollback(session, error);
875
session->options= save_options;
405
} /* namespace drizzled */