Question

我在SQL Server 2000的表中有一个触发器，这是触发器：

ALTER Trigger [dbo].[Set_Asignado_State] ON [dbo].[Tables] 
FOR INSERT AS 
BEGIN           
    DECLARE @area varchar(1)
    SELECT @area = Table_Area_ID FROM inserted

    IF (@area = 'L')
    BEGIN
        INSERT INTO Table_History
        SELECT  (SELECT TOP 1 Table_Area_Id AS Table_Area_Id FROM inserted) AS Table_Area_Id,
                (SELECT SUBSTRING( CAST( YEAR( GETDATE() ) AS VARCHAR), 3, 2) ) AS Table_Year, 
                (SELECT TOP 1 Table_Seq AS Table_Seq FROM inserted) AS Table_Seq, 
                (SELECT TOP 1 ID FROM Table_Status WHERE Description = 'Asignado') AS Status, 
                '' AS Responsible, 
                (SELECT TOP 1 OrigDept FROM inserted) AS User_Responsible, 
                GETDATE() AS [DateTime],
                'None' AS Comments
        FROM Tables
        WHERE Tables.Table_Area_Id = (SELECT TOP 1 Table_Area_Id AS Table_Area_Id FROM inserted) AND
              Tables.Table_Year = (SELECT SUBSTRING(CAST(YEAR(GETDATE()) AS VARCHAR), 3, 2) )

        IF @@ERROR <> 0
        BEGIN
            DECLARE @errorMsg NVARCHAR(256)
            SET @errorMsg = @@ERROR; 

            PRINT 'Error Inserting in Table_History'

        END
    END
END

现在，当他们在“Tables”中插入记录时，会调用触发器，但它会继续在Table_History上插入许多记录。

我和同龄人谈过，似乎没有错！ = S关于这个的任何线索？难道我做错了什么？

提前致谢=）

Answer 1

Table_History表上是否有另一个触发器插入到表中？

Answer 2

触发器是基于设置的，所以执行
IF (@area = 'L') 只会查看插入表中的第一条记录。尝试将检查添加为WHERE子句的一部分：

WHERE Tables.Table_Area_Id = (SELECT TOP 1 Table_Area_Id AS Table_Area_Id FROM inserted) AND
              Tables.Table_Year = (SELECT SUBSTRING(CAST(YEAR(GETDATE()) AS VARCHAR), 3, 2) )  
 AND SUBSTRING(Tables.Table_Area_Id, 1, 1) = 'L'

你确定主Select语句只返回一行吗？我注意到你已经广泛使用了Top（1）限定符。如果它返回多行，则会在历史记录表中插入多行。

也许作为盲注，尝试为最外面的选择放入Top（1）：

    INSERT INTO Table_History
    SELECT TOP(1) (SELECT TOP 1 ...

否则看起来好像你在触发器中有一些递归。我看不到它，但如果你愿意，你可以关闭整个数据库的递归触发，因为它是一个数据库选项。

SQL Server 2000奇数插入触发器行为 - 递归类似

2 个答案: