Question

我有一个AFTER UPDATE触发器，几乎总是一次对多行执行。发生这种情况时，它需要进行更新，删除和插入。对于更新/删除，我正在处理多个行，如下所示：

DELETE lss
FROM dbo.Lab_SubSpace lss
JOIN Inserted i ON lss.Lab_Space_Id = i.id
WHERE i.Occupancy_Status_code = 'vacant' OR i.Status_Code IN ('retired', 'unknown');

尽管现在我遇到的困难是，我还需要为每行更新的表插入另一个表。除了仅使用游标在Inserted表上循环然后执行INSERT INTO操作外，我不确定如何处理。像这样：

DECLARE c CURSOR 
FAST_FORWARD READ_ONLY LOCAL 
FOR SELECT i.id, i.Floor_Space_Area_Qty, sp.WWID
FROM Inserted i
JOIN dbo.Space_Planners sp ON i.Building_Location_Id = sp.LocationId
WHERE i.Status_Code NOT IN ('retired', 'unknown');

OPEN c

FETCH NEXT FROM c INTO @labSpaceId, @sqFt, @poc;

WHILE @@FETCH_STATUS = 0
BEGIN
    INSERT INTO dbo.Lab_SubSpace (...)
    VALUES (@labSpaceId, @sqFt, @poc, ...);

    FETCH NEXT FROM c INTO @labSpaceId, @sqFt, @poc;
END

有更好的方法吗？

Answer 1

与其使用inerted遍历cursor表并一一插入记录，不如使用insert...select：

INSERT INTO dbo.Lab_SubSpace (...)
SELECT i.id, i.Floor_Space_Area_Qty, sp.WWID
FROM Inserted i
JOIN dbo.Space_Planners sp 
    ON i.Building_Location_Id = sp.LocationId
WHERE i.Status_Code NOT IN ('retired', 'unknown');

Answer 2

你能尝试

INSERT INTO dbo.Lab_Subspace(<field1>, <field2>, <field3>)
SELECT i.id, i.Floor_Space_Area_Qty, sp.WWID
FROM Inserted i
JOIN dbo.Space_Planners sp ON i.Building_Location_Id = sp.LocationId
WHERE i.Status_Code NOT IN ('retired', 'unknown')

SQL对UPDATE触发器中的每个更新的行执行INSERT

2 个答案: