information_schema系统表——EVENTS

调度计划事件信息表

The EVENTS table provides information about scheduled events, which are discussed in Section 23.4, “Using the Event Scheduler”. The SHOW Name values correspond to column names of the SHOW EVENTS statement.

INFORMATION_SCHEMA Name	SHOW Name	Remarks
EVENT_CATALOG		def, MySQL extension
EVENT_SCHEMA	Db	MySQL extension
EVENT_NAME	Name	MySQL extension
DEFINER	Definer	MySQL extension
TIME_ZONE	Time zone	MySQL extension
EVENT_BODY		MySQL extension
EVENT_DEFINITION		MySQL extension
EVENT_TYPE	Type	MySQL extension
EXECUTE_AT	Execute at	MySQL extension
INTERVAL_VALUE	Interval value	MySQL extension
INTERVAL_FIELD	Interval field	MySQL extension
SQL_MODE		MySQL extension
STARTS	Starts	MySQL extension
ENDS	Ends	MySQL extension
STATUS	Status	MySQL extension
ON_COMPLETION		MySQL extension
CREATED		MySQL extension
LAST_ALTERED		MySQL extension
LAST_EXECUTED		MySQL extension
EVENT_COMMENT		MySQL extension
ORIGINATOR	Originator	MySQL extension
CHARACTER_SET_CLIENT	character_set_client	MySQL extension
COLLATION_CONNECTION	collation_connection	MySQL extension
DATABASE_COLLATION	Database Collation	MySQL extension

Notes:

• The EVENTS table is a nonstandard table.

• EVENT_CATALOG: The value of this column is always def.

• EVENT_SCHEMA: The name of the schema (database) to which this event belongs.

• EVENT_NAME: The name of the event.

• DEFINER: The account of the user who created the event, in 'user_name'@'host_name' format.

• TIME_ZONE: The event time zone, which is the time zone used for scheduling the event and that is in effect within the event as it executes. The default value is SYSTEM.

• EVENT_BODY: The language used for the statements in the event's DO clause; in MySQL 5.7, this is always SQL.

  This column is not to be confused with the column of the same name (now named EVENT_DEFINITION) that existed in earlier MySQL versions.

• EVENT_DEFINITION: The text of the SQL statement making up the event's DO clause; in other words, the statement executed by this event.

• EVENT_TYPE: The event repetition type, either ONE TIME (transient) or RECURRING (repeating).

• EXECUTE_AT: For a one-time event, this is the DATETIME value specified in the AT clause of the CREATE EVENT statement used to create the event, or of the last ALTER EVENT statement that modified the event. The value shown in this column reflects the addition or subtraction of any INTERVAL value included in the event's AT clause. For example, if an event is created using ON SCHEDULE AT CURRENT_TIMESTAMP + '1:6' DAY_HOUR, and the event was created at 2006-02-09 14:05:30, the value shown in this column would be '2006-02-10 20:05:30'.

  If the event's timing is determined by an EVERY clause instead of an AT clause (that is, if the event is recurring), the value of this column is NULL.

• INTERVAL_VALUE: For recurring events, this column contains the numeric portion of the event's EVERY clause.

  For a one-time event (that is, an event whose timing is determined by an AT clause), this column is NULL.

• INTERVAL_FIELD: For recurring events, this column contains the units portion of the EVERY clause governing the timing of the event. Thus, this column contains a value such as 'YEAR', 'QUARTER', 'DAY', and so on.

  For a one-time event (that is, an event whose timing is determined by an AT clause), this column is NULL.

• SQL_MODE: The SQL mode in effect when the event was created or altered, and under which the event executes. For the permitted values, see Section 5.1.8, “Server SQL Modes”.

• STARTS: For a recurring event whose definition includes a STARTS clause, this column contains the corresponding DATETIME value. As with the EXECUTE_AT column, this value resolves any expressions used.

  If there is no STARTS clause affecting the timing of the event, this column is NULL

• ENDS: For a recurring event whose definition includes a ENDS clause, this column contains the corresponding DATETIME value. As with the EXECUTE_AT column, this value resolves any expressions used.

  If there is no ENDS clause affecting the timing of the event, this column is NULL.

• STATUS: One of the three values ENABLED, DISABLED, or SLAVESIDE_DISABLED.

  SLAVESIDE_DISABLED indicates that the creation of the event occurred on another MySQL server acting as a replication master and was replicated to the current MySQL server which is acting as a slave, but the event is not presently being executed on the slave. See Section 16.4.1.16, “Replication of Invoked Features”, for more information.

• ON_COMPLETION: One of the two values PRESERVE or NOT PRESERVE.

• CREATED: The date and time when the event was created. This is a TIMESTAMP value.

• LAST_ALTERED: The date and time when the event was last modified. This is a TIMESTAMP value. If the event has not been modified since its creation, this column holds the same value as the CREATED column.

• LAST_EXECUTED: The date and time when the event last executed. A DATETIME value. If the event has never executed, this column is NULL.

  LAST_EXECUTED indicates when the event started. As a result, the ENDS column is never less than LAST_EXECUTED.

• EVENT_COMMENT: The text of a comment, if the event has one. If not, the value of this column is an empty string.

• ORIGINATOR: The server ID of the MySQL server on which the event was created; used in replication. The default value is 0.

• CHARACTER_SET_CLIENT: The session value of the character_set_client system variable when the event was created.

• COLLATION_CONNECTION: The session value of the collation_connection system variable when the event was created.

• DATABASE_COLLATION: The collation of the database with which the event is associated.