MySql的觸發器 - 引用聲明

CREATE TRIGGER Tr1 
AFTER DELETE ON Table1 
REFERENCING 
    OLD TABLE AS OldTable, 
    NEW TABLE AS NewTable 
FOR EACH STATEMENT

產生以下錯誤：MySql的觸發器 - 引用聲明

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that  corresponds to your MySQL server version for the right syntax to use near 'REFERENCING 
OLD TABLE AS OldTable, 
NEW TABLE AS NewTable

這是爲什麼？

來源

2012-11-26 Trup

參見[MySQL的更新觸發錯誤]（http://stackoverflow.com/questions/9095519/mysql-update-觸發錯誤） –

'REFERENCING'不是MySQL的一部分['CREATE TRIGGER'語法]（http://dev.mysql.com/doc/refman/5.5/en/create-trigger.html）。 –

那麼我如何才能引用舊錶，即它的狀態，如果我想要做這樣的事情http://stackoverflow.com/questions/13557205/mysql-trigger-for-keeping-min-number-of-rows – Trup

如果你想查看舊錶，那麼你應該創建BEFORE DELETE觸發器 -

CREATE TRIGGER Tr1 
    BEFORE DELETE 
    ON Table1 
    FOR EACH ROW 
BEGIN 
    ... 
    SET @old_count = NULL; 
    SELECT COUNT(*) INTO @old_count FROM Table1; 
    ... 
END

來源

2012-11-26 07:23:26 Devart

MySql的觸發器 - 引用聲明

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