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SQLiteÓï·¨ CREATE TRIGGER


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CREATE TRIGGER
    
        
            sql-statement ::=
            CREATE [TEMP | TEMPORARY] TRIGGER trigger-name [ BEFORE | AFTER ]
            database-event ON [database-name .] table-name
CREATE TRIGGER
sql-statement
 ::=
CREATE
[TEMP
|

TEMPORARY
] TRIGGER
trigger-name

[ BEFORE
|
AFTER
]

database-event
ON
[database-name
.
]
table-name

trigger-action
sql-statement
 ::=
CREATE
[TEMP
|

TEMPORARY
] TRIGGER
trigger-name
INSTEAD OF

database-event
ON
[database-name
.
]
view-name

trigger-action
database-event
 ::=
DELETE
|

INSERT
|

UPDATE
|

UPDATE OF
column-list
trigger-action
 ::=
[ FOR EACH ROW
|
FOR EACH
STATEMENT
]
[ WHEN
expression

]
BEGIN
    
trigger-step
;
[
trigger-step
;
]*
END
trigger-step
 ::=
update-statement

|

insert-statement

|


delete-statement

|

select-statement
CREATE
TRIGGERÓï¾äÓÃÓÚÏòÊý¾Ý¿âschemaÖÐÌí¼Ó´¥·¢Æ÷¡£´¥·¢Æ÷ÊÇһЩÔÚÌض¨µÄÊý¾Ý¿âʼþ(database-event
)
·¢Éúʱ×Ô¶¯½øÐеÄÊý¾Ý¿â²Ù×÷(trigger-action
).
´¥·¢Æ÷
¿ÉÓÉÔÚÌØÊâ±íÉÏÖ´ÐеÄDELETE, INSERT, UPDATEµÈÓï¾ä´¥·¢£¬»òUPDATE±íÖÐÌض¨µÄ×Ö¶Îʱ´¥·¢¡£
ÏÖÔÚ
SQLite½öÖ§³ÖFOR EACH ROW´¥·¢Æ÷£¬²»Ö§³ÖFOR EACH STATEMENT´¥·¢¡£Òò´Ë¿ÉÒÔ²»ÓÃÃ÷ȷ˵Ã÷FOR EACH ROW
.FOR EACH ROWµÄÒâ˼ÊÇÓÉtrigger-steps
˵Ã÷µÄSQLÓï¾ä¿ÉÄÜÔÚ(ÓÉWHEN×Ó¾ä¾ö¶¨µÄ)Êý¾Ý¿â²åÈ룬¸ü¸Ä»òɾ³ý
µÄÿһÐд¥·¢trigger.
WHEN
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