我们如何使用INFORMATION_SCHEMA来获取有关特定数据库中触发器的详细信息？
可以在以下语句的帮助下完成-
mysql> select * from information_schema.triggers where
-> information_schema.triggers.trigger_schema like '%query%'\G
*************************** 1. row ***************************
TRIGGER_CATALOG: def
TRIGGER_SCHEMA: query
TRIGGER_NAME: trigger_before_delete_sample
EVENT_MANIPULATION: DELETE
EVENT_OBJECT_CATALOG: def
EVENT_OBJECT_SCHEMA: query
EVENT_OBJECT_TABLE: sample
ACTION_ORDER: 1
ACTION_CONDITION: NULL
ACTION_STATEMENT: BEGIN
SET @count = if (@count IS NULL, 1, (@count+1));
INSERT INTO sample_rowaffected values (@count);
END
ACTION_ORIENTATION: ROW
ACTION_TIMING: BEFORE
ACTION_REFERENCE_OLD_TABLE: NULL
ACTION_REFERENCE_NEW_TABLE: NULL
ACTION_REFERENCE_OLD_ROW: OLD
ACTION_REFERENCE_NEW_ROW: NEW
CREATED: 2017-11-21 12:31:58.70
SQL_MODE: ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION
DEFINER: root@localhost
CHARACTER_SET_CLIENT: cp850
COLLATION_CONNECTION: cp850_general_ci
DATABASE_COLLATION: latin1_swedish_ci
*************************** 2. row ***************************
TRIGGER_CATALOG: def
TRIGGER_SCHEMA: query
TRIGGER_NAME: before_inser_studentage
EVENT_MANIPULATION: INSERT
EVENT_OBJECT_CATALOG: def
EVENT_OBJECT_SCHEMA: query
EVENT_OBJECT_TABLE: student_age
ACTION_ORDER: 1
ACTION_CONDITION: NULL
ACTION_STATEMENT: IF NEW.age < 0 THEN SET NEW.age = 0;
END IF
ACTION_ORIENTATION: ROW
ACTION_TIMING: BEFORE
ACTION_REFERENCE_OLD_TABLE: NULL
ACTION_REFERENCE_NEW_TABLE: NULL
ACTION_REFERENCE_OLD_ROW: OLD
ACTION_REFERENCE_NEW_ROW: NEW
CREATED: 2017-11-21 11:26:15.34
SQL_MODE: ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION
DEFINER: root@localhost
CHARACTER_SET_CLIENT: cp850
COLLATION_CONNECTION: cp850_general_ci
DATABASE_COLLATION: latin1_swedish_ci
2 rows in set (0.03 sec)