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.