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 NameSHOW NameRemarksEVENT_CATALOG def, MySQL extensionEVENT_SCHEMADbMySQL extensionEVENT_NAMENameMySQL extensionDEFINERDefinerMySQL extensionTIME_ZONETime zoneMySQL extensionEVENT_BODY MySQL extensionEVENT_DEFINITION MySQL extensionEVENT_TYPETypeMySQL extensionEXECUTE_ATExecute atMySQL extensionINTERVAL_VALUEInterval valueMySQL extensionINTERVAL_FIELDInterval fieldMySQL extensionSQL_MODE MySQL extensionSTARTSStartsMySQL extensionENDSEndsMySQL extensionSTATUSStatusMySQL extensionON_COMPLETION MySQL extensionCREATED MySQL extensionLAST_ALTERED MySQL extensionLAST_EXECUTED MySQL extensionEVENT_COMMENT MySQL extensionORIGINATOROriginatorMySQL extensionCHARACTER_SET_CLIENTcharacter_set_clientMySQL extensionCOLLATION_CONNECTIONcollation_connectionMySQL extensionDATABASE_COLLATIONDatabase CollationMySQL 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.