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#ifndef SQL_TRIGGER_INCLUDED
#define SQL_TRIGGER_INCLUDED
/* 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; version 2 of the License.
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 the 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];
/**
Heads of the lists linking items for all fields used in triggers
grouped by event and action_time.
*/
Item_trigger_field *trigger_fields[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 *trigger_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;
/**
List of "ON table_name" parts in trigger definitions, used for
updating trigger definitions during RENAME TABLE.
*/
List<LEX_STRING> on_table_names_list;
/**
Grant information for each trigger (pair: subject table, trigger definer).
*/
GRANT_INFO subject_table_grants[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;
/* Character set context, used for parsing and executing triggers. */
List<LEX_STRING> client_cs_names;
List<LEX_STRING> connection_cl_names;
List<LEX_STRING> db_cl_names;
/* End of character ser context. */
Table_triggers_list(TABLE *table_arg):
record1_field(0), trigger_table(table_arg)
{
bzero((char *)bodies, sizeof(bodies));
bzero((char *)trigger_fields, sizeof(trigger_fields));
bzero((char *)&subject_table_grants, sizeof(subject_table_grants));
}
~Table_triggers_list();
bool create_trigger(THD *thd, TABLE_LIST *table, String *stmt_query);
bool drop_trigger(THD *thd, TABLE_LIST *table, String *stmt_query);
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,
LEX_STRING *client_cs_name,
LEX_STRING *connection_cl_name,
LEX_STRING *db_cl_name);
void get_trigger_info(THD *thd,
int trigger_idx,
LEX_STRING *trigger_name,
ulonglong *sql_mode,
LEX_STRING *sql_original_stmt,
LEX_STRING *client_cs_name,
LEX_STRING *connection_cl_name,
LEX_STRING *db_cl_name);
int find_trigger_by_name(const LEX_STRING *trigger_name);
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);
static bool change_table_name(THD *thd, const char *db,
const char *old_table,
const char *new_db,
const char *new_table);
bool has_triggers(trg_event_type event_type,
trg_action_time_type action_time)
{
return (bodies[event_type][action_time] != NULL);
}
bool has_delete_triggers()
{
return (bodies[TRG_EVENT_DELETE][TRG_ACTION_BEFORE] ||
bodies[TRG_EVENT_DELETE][TRG_ACTION_AFTER]);
}
void set_table(TABLE *new_table);
void mark_fields_used(trg_event_type event);
friend class Item_trigger_field;
bool add_tables_and_routines_for_triggers(THD *thd,
Query_tables_list *prelocking_ctx,
TABLE_LIST *table_list);
private:
bool prepare_record1_accessors(TABLE *table);
LEX_STRING* change_table_name_in_trignames(const char *old_db_name,
const char *new_db_name,
LEX_STRING *new_table_name,
LEX_STRING *stopper);
bool change_table_name_in_triggers(THD *thd,
const char *old_db_name,
const char *new_db_name,
LEX_STRING *old_table_name,
LEX_STRING *new_table_name);
};
extern const LEX_STRING trg_action_time_type_names[];
extern const LEX_STRING trg_event_type_names[];
bool add_table_for_trigger(THD *thd,
const sp_name *trg_name,
bool continue_if_not_exist,
TABLE_LIST **table);
void build_trn_path(THD *thd, const sp_name *trg_name, LEX_STRING *trn_path);
bool check_trn_exists(const LEX_STRING *trn_path);
bool load_table_name_for_trigger(THD *thd,
const sp_name *trg_name,
const LEX_STRING *trn_path,
LEX_STRING *tbl_name);
#endif /* SQL_TRIGGER_INCLUDED */
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