MySql的触发器 - 引用声明

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

产生以下错误：MySql的触发器 - 引用声明

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

这是为什么？

来源

2012-11-26 Trup

参见[MySQL的更新触发错误]（http://stackoverflow.com/questions/9095519/mysql-update-触发错误） –

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

那么我如何才能引用旧表，即它的状态，如果我想要做这样的事情http://stackoverflow.com/questions/13557205/mysql-trigger-for-keeping-min-number-of-rows – Trup

如果你想查看旧表，那么你应该创建BEFORE DELETE触发器 -

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

来源

2012-11-26 07:23:26 Devart

MySql的触发器 - 引用声明

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