我们如何获取MySQL事件的元数据？
可以在INFORMATION_SCHEMA数据库的帮助下完成。以下语句将为我们提供事件的元数据-
mysql> SELECT * from INFORMATION_SCHEMA.EVENTS WHERE EVENT_NAME LIKE '%event%' AND EVENT_SCHEMA = 'query'\G
*************************** 1. row ***************************
EVENT_CATALOG: def
EVENT_SCHEMA: query
EVENT_NAME: testing_event6
DEFINER: root@localhost
TIME_ZONE: SYSTEM
EVENT_BODY: SQL
EVENT_DEFINITION: INSERT INTO event_message(message,generated_at) values('EVENT ALTERED', NOW())
EVENT_TYPE: ONE TIME
EXECUTE_AT: 2017-11-22 20:03:52
INTERVAL_VALUE: NULL
INTERVAL_FIELD: NULL
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
STARTS: NULL
ENDS: NULL
STATUS: DISABLED
ON_COMPLETION: PRESERVE
CREATED: 2017-11-22 20:02:52
LAST_ALTERED: 2017-11-22 21:01:17
LAST_EXECUTED: 2017-11-22 20:03:52
EVENT_COMMENT:
ORIGINATOR: 0
CHARACTER_SET_CLIENT: cp850
COLLATION_CONNECTION: cp850_general_ci
DATABASE_COLLATION: latin1_swedish_ci
*************************** 2. row ***************************
EVENT_CATALOG: def
EVENT_SCHEMA: query
EVENT_NAME: testing_event_with_preserves
DEFINER: root@localhost
TIME_ZONE: SYSTEM
EVENT_BODY: SQL
EVENT_DEFINITION: INSERT INTO event_MESSAGES(Message, generated_at) Values('Altered',NOW())
EVENT_TYPE: RECURRING
EXECUTE_AT: NULL
INTERVAL_VALUE: 1
INTERVAL_FIELD: MINUTE
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
STARTS: 2017-11-22 21:03:01
ENDS: NULL
STATUS: DISABLED
ON_COMPLETION: PRESERVE
CREATED: 2017-11-22 20:35:12
LAST_ALTERED: 2017-11-22 21:04:42
LAST_EXECUTED: 2017-11-22 20:35:12
EVENT_COMMENT:
ORIGINATOR: 0
CHARACTER_SET_CLIENT: cp850
COLLATION_CONNECTION: cp850_general_ci
DATABASE_COLLATION: latin1_swedish_ci
2 rows in set (0.00 sec)
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