如何列出MySQL数据库中的所有触发器？

要列出MySQL数据库中的所有触发器，可以使用SHOW命令。查询如下-

mysql> show triggers;

以下是输出-

+----------------+--------+----------------------+--------------------------------------------------------------------+--------+------------------------+--------------------------------------------+---------+----------------------+----------------------+--------------------+
| Trigger        | Event  | Table                | Statement                                                          | Timing | Created                | sql_mode                                   | Definer | character_set_client | collation_connection | Database Collation |
+----------------+--------+----------------------+--------------------------------------------------------------------+--------+------------------------+--------------------------------------------+---------+----------------------+----------------------+--------------------+
| binsertTrigger | INSERT | functiontriggersdemo | SET new.Id = uuid() | BEFORE | 2018-10-16 13:36:09.86 | STRICT_TRANS_TABLES,NO_ENGINE_SUBSTITUTION | root@% | cp850 | cp850_general_ci | utf8mb4_unicode_ci |
| Table1Trigger | INSERT | table1 | begin
insert into Table2(id, name) values (new.id, new.name);
end | AFTER | 2018-10-23 10:51:31.76 | STRICT_TRANS_TABLES,NO_ENGINE_SUBSTITUTION | root@% | cp850 | cp850_general_ci | utf8mb4_unicode_ci |
| insertBef | INSERT | tblfunctiontrigger | SET new.id = uuid() | BEFORE | 2018-10-16 13:44:10.93 | STRICT_TRANS_TABLES,NO_ENGINE_SUBSTITUTION | root@% | cp850 | cp850_general_ci | utf8mb4_unicode_ci |
+----------------+--------+----------------------+--------------------------------------------------------------------+--------+------------------------+--------------------------------------------+---------+----------------------+----------------------+--------------------+
3 rows in set (0.13 sec)

您可以在以下查询的帮助下访问information_schema表。

注意-您必须具有MySQL 5.0.10及更高版本。我目前正在使用MySQL版本8.0.12-

mysql> select trigger_schema, trigger_name, action_statement
−> from information_schema.triggers;

以下是输出-

+----------------+----------------------------+-------------------------------------------------------------------------------------------------------------------+
| TRIGGER_SCHEMA | TRIGGER_NAME               | ACTION_STATEMENT                                                                                                  |
+----------------+----------------------------+-------------------------------------------------------------------------------------------------------------------+
| sys            | sys_config_insert_set_user | BEGIN IF @sys.ignore_sys_config_triggers != true AND NEW.set_by IS NULL THEN SET NEW.set_by = USER(); END IF; END |
| sys            | sys_config_update_set_user | BEGIN IF @sys.ignore_sys_config_triggers != true AND NEW.set_by IS NULL THEN SET NEW.set_by = USER(); END IF; END |
| business       | binsertTrigger             | SET new.Id = uuid()                                                                                               |
| business       | insertBef                  | SET new.id = uuid()                                                                                               |
| business       | Table1Trigger              | begin
insert into Table2(id, name) values (new.id, new.name);end                                                                                                        |
+----------------+----------------------------+-------------------------------------------------------------------------------------------------------------------+
5 rows in set (0.00 sec)