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e231ebe5fb
This bug occurs when some trigger for table used by DML statement is created or changed while statement was waiting in lock_tables(). In this situation prelocking set which we have calculated becames invalid which can easily lead to errors and even in some cases to crashes. With proposed patch we no longer silently reopen tables in lock_tables(), instead caller of lock_tables() becomes responsible for reopening tables and recalculation of prelocking set.
112 lines
3.9 KiB
C++
112 lines
3.9 KiB
C++
/* Copyright (C) 2004-2005 MySQL AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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/*
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This class holds all information about triggers of table.
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QQ: Will it be merged into TABLE in future ?
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*/
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class Table_triggers_list: public Sql_alloc
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{
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/* Triggers as SPs grouped by event, action_time */
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sp_head *bodies[TRG_EVENT_MAX][TRG_ACTION_MAX];
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/*
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Copy of TABLE::Field array with field pointers set to TABLE::record[1]
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buffer instead of TABLE::record[0] (used for OLD values in on UPDATE
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trigger and DELETE trigger when it is called for REPLACE).
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*/
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Field **record1_field;
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/*
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During execution of trigger new_field and old_field should point to the
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array of fields representing new or old version of row correspondingly
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(so it can point to TABLE::field or to Tale_triggers_list::record1_field)
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*/
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Field **new_field;
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Field **old_field;
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/* TABLE instance for which this triggers list object was created */
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TABLE *table;
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/*
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Names of triggers.
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Should correspond to order of triggers on definitions_list,
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used in CREATE/DROP TRIGGER for looking up trigger by name.
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*/
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List<LEX_STRING> names_list;
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/*
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Key representing triggers for this table in set of all stored
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routines used by statement.
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TODO: We won't need this member once triggers namespace will be
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database-wide instead of table-wide because then we will be able
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to use key based on sp_name as for other stored routines.
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*/
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LEX_STRING sroutines_key;
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public:
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/*
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Field responsible for storing triggers definitions in file.
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It have to be public because we are using it directly from parser.
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*/
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List<LEX_STRING> definitions_list;
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/*
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List of sql modes for triggers
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*/
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List<ulonglong> definition_modes_list;
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Table_triggers_list(TABLE *table_arg):
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record1_field(0), table(table_arg)
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{
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bzero((char *)bodies, sizeof(bodies));
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}
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~Table_triggers_list();
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bool create_trigger(THD *thd, TABLE_LIST *table);
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bool drop_trigger(THD *thd, TABLE_LIST *table);
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bool process_triggers(THD *thd, trg_event_type event,
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trg_action_time_type time_type,
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bool old_row_is_record1);
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bool get_trigger_info(THD *thd, trg_event_type event,
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trg_action_time_type time_type,
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LEX_STRING *trigger_name, LEX_STRING *trigger_stmt,
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ulong *sql_mode);
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static bool check_n_load(THD *thd, const char *db, const char *table_name,
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TABLE *table, bool names_only);
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static bool drop_all_triggers(THD *thd, char *db, char *table_name);
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bool has_delete_triggers()
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{
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return (bodies[TRG_EVENT_DELETE][TRG_ACTION_BEFORE] ||
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bodies[TRG_EVENT_DELETE][TRG_ACTION_AFTER]);
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}
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bool has_before_update_triggers()
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{
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return test(bodies[TRG_EVENT_UPDATE][TRG_ACTION_BEFORE]);
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}
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void set_table(TABLE *new_table);
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friend class Item_trigger_field;
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friend void sp_cache_routines_and_add_tables_for_triggers(THD *thd, LEX *lex,
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Table_triggers_list *triggers);
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private:
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bool prepare_record1_accessors(TABLE *table);
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};
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extern const LEX_STRING trg_action_time_type_names[];
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extern const LEX_STRING trg_event_type_names[];
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