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[英]maximum stored procedure, function, trigger, or view nesting level exceeded
[英]Trigger causing Maximum trigger nesting level exceeded
我创建了一个新触发器,如果交付的商品数量等于订购的数量,它会更新我的[Purchase Table]
,但每次运行时都会出现以下错误。
ODBC--对链接表“dbo_Purchase Table”的更新失败。
超出最大存储过程、函数、触发器或视图嵌套级别(限制 32)。 (#217)
这是我创建的触发器:
USE [####]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER TRIGGER [dbo].[trUpdatePurchaseTableStatus]
ON [dbo].[Purchase Table]
AFTER UPDATE
AS
BEGIN
SET NOCOUNT ON;
UPDATE PT
SET PT.Delivered = 1
FROM inserted as I
INNER JOIN dbo.[Purchase Table] AS PT
ON [PT].[ID] = I.[ID]
WHERE PT.deliveredQTY >= PT.QTY
END
如果Delivered
的值纯粹基于deliveredQTY
的值是否大于或等于QTY
我建议改用计算列,那么您不需要TRIGGER
。
您不能将现有列更改为计算列(甚至不能ALTER
计算列),您需要DROP
列然后添加它:
--You would also need to DROP any CONSTRAINTs and/or INDEXes, etc, that use the column
ALTER TABLE dbo.[Purchase Table] DROP COLUMN Delivered;
GO
ALTER TABLE dbo.[Purchase Table]
ADD Delivered AS CONVERT(bit,CASE WHEN deliveredQTY >= QTY THEN 1 ELSE 0 END) /*PERSISTED*/; --If the column is to be indexed, you'll likely want the PERSISTED
GO
真正的答案是使用计算列,就像@Larnu 说的那样。
但是,如果您真的想为此使用触发器,则可以将以下代码放在顶部以提早退出
ALTER TRIGGER [dbo].[trUpdatePurchaseTableStatus]
ON [dbo].[Purchase Table]
AFTER UPDATE
AS
SET NOCOUNT ON;
IF TRIGGER_NESTLEVEL(@@PROCID, 'AFTER', 'DML') > 1
OR NOT EXISTS (SELECT 1 FROM inserted)
RETURN;
UPDATE PT
..........
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