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/* Copyright (C) 2004-2005 MySQL AB
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.
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.
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 class holds all information about triggers of table.
QQ: Will it be merged into TABLE in future ?
*/
class Table_triggers_list: public Sql_alloc
{
/* Triggers as SPs grouped by event, action_time */
sp_head *bodies[TRG_EVENT_MAX][TRG_ACTION_MAX];
/*
Copy of TABLE::Field array with field pointers set to TABLE::record[1]
buffer instead of TABLE::record[0] (used for OLD values in on UPDATE
trigger and DELETE trigger when it is called for REPLACE).
*/
Field **record1_field;
/*
During execution of trigger new_field and old_field should point to the
array of fields representing new or old version of row correspondingly
(so it can point to TABLE::field or to Tale_triggers_list::record1_field)
*/
Field **new_field;
Field **old_field;
/* TABLE instance for which this triggers list object was created */
TABLE *table;
/*
Names of triggers.
Should correspond to order of triggers on definitions_list,
used in CREATE/DROP TRIGGER for looking up trigger by name.
*/
List<LEX_STRING> names_list;
/*
Key representing triggers for this table in set of all stored
routines used by statement.
TODO: We won't need this member once triggers namespace will be
database-wide instead of table-wide because then we will be able
to use key based on sp_name as for other stored routines.
*/
LEX_STRING sroutines_key;
/*
is_special_var_used specifies whether trigger body contains special
variables (NEW/OLD).
*/
bool m_spec_var_used[TRG_EVENT_MAX][TRG_ACTION_MAX];
public:
/*
Field responsible for storing triggers definitions in file.
It have to be public because we are using it directly from parser.
*/
List<LEX_STRING> definitions_list;
/*
List of sql modes for triggers
*/
List<ulonglong> definition_modes_list;
List<LEX_STRING> definers_list;
Table_triggers_list(TABLE *table_arg):
record1_field(0), table(table_arg)
{
bzero((char *)bodies, sizeof(bodies));
}
~Table_triggers_list();
bool create_trigger(THD *thd, TABLE_LIST *table,
LEX_STRING *definer_user,
LEX_STRING *definer_host);
bool drop_trigger(THD *thd, TABLE_LIST *table);
bool process_triggers(THD *thd, trg_event_type event,
trg_action_time_type time_type,
bool old_row_is_record1);
bool get_trigger_info(THD *thd, trg_event_type event,
trg_action_time_type time_type,
LEX_STRING *trigger_name, LEX_STRING *trigger_stmt,
ulong *sql_mode,
LEX_STRING *definer);
static bool check_n_load(THD *thd, const char *db, const char *table_name,
TABLE *table, bool names_only);
static bool drop_all_triggers(THD *thd, char *db, char *table_name);
bool has_delete_triggers()
{
return (bodies[TRG_EVENT_DELETE][TRG_ACTION_BEFORE] ||
bodies[TRG_EVENT_DELETE][TRG_ACTION_AFTER]);
}
bool has_before_update_triggers()
{
return test(bodies[TRG_EVENT_UPDATE][TRG_ACTION_BEFORE]);
}
inline bool is_special_var_used(int event, int action_time) const
{
return m_spec_var_used[event][action_time];
}
void set_table(TABLE *new_table);
friend class Item_trigger_field;
friend void sp_cache_routines_and_add_tables_for_triggers(THD *thd, LEX *lex,
Table_triggers_list *triggers);
private:
bool prepare_record1_accessors(TABLE *table);
};
extern const LEX_STRING trg_action_time_type_names[];
extern const LEX_STRING trg_event_type_names[];
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