触发器导致主键违规

Question

我们有一个触发器，我们正在尝试更新，以便更新记录时触发器将更新第二个表。当我们激活变化，我们得到一个错误

违反PRIMARY KEY contstraint的“KPRIMARY_SO_SalesOrderHeader”。不能在对象中插入重复键“dbo.SO_SalesOrderHeader”。重复密钥是XXXXXX。

我真的很困惑，因为我没有在触发器中看到我们试图插入密钥。

ALTER Trigger [dbo].[SO_SALESORDERHEADER_onOrderChange] 
ON [dbo].[SO_SalesOrderHeader] 
FOR INSERT, UPDATE 
AS 
    SET NOCOUNT ON; 
    --+ 
    INSERT INTO dbo.OrderUpdateQueue (SourceId, OrderNumber, Action) 
     SELECT DISTINCT 
      N'SO', Inserted.SALESORDERNO, N'U' 
     FROM 
      Inserted 
     LEFT JOIN 
      dbo.OrderUpdateQueue ON (Inserted.SALESORDERNO = OrderUpdateQueue.OrderNumber) 
           AND (OrderUpdateQueue.SourceID = N'SO') 
           AND (OrderUpdateQueue.Action = N'U') 
     WHERE 
      (OrderUpdateQueue.[Key] IS NULL) 
      AND (Inserted.SALESORDERNO IS NOT NULL); 
    --+ New Trigger Stuff 
    UPDATE MO 
    SET MO.[ShipDate] = I.ShipExpireDate 
    FROM [BACKEND_db].[dbo].[Order] MO 
    INNER JOIN Inserted I ON I.SalesOrderNo = MO.OrderId 
    WHERE MO.ShipDate <> I.ShipExpireDate; 



CREATE TABLE [dbo].[SO_SalesOrderHeader](
[SalesOrderNo] [varchar](7) NOT NULL 
    CONSTRAINT [KPRIMARY_SO_SalesOrderHeader] PRIMARY KEY CLUSTERED 
(
[SalesOrderNo] ASC 
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, 
ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] 
) ON [PRIMARY] 
GO 

CREATE TABLE [dbo].[OrderUpdateQueue](
[Key] [int] IDENTITY(1,1) NOT NULL, 
[SourceId] [nvarchar](50) NOT NULL, 
[OrderNumber] [nvarchar](50) NOT NULL, 
[Action] [nchar](1) NOT NULL, 
CONSTRAINT [PK_OrderUpdateQueue] PRIMARY KEY CLUSTERED 
(
[Key] ASC 
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, 
ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] 
) ON [PRIMARY] 
GO 

USE [BACKEND_db] 
CREATE TABLE [dbo].[Order](
[Key] [int] IDENTITY(1,1) NOT NULL, 
[OrderId] [nvarchar](10) NULL, 
[ShipDate] [datetime] NULL 
CONSTRAINT [PK_MasOrder] PRIMARY KEY CLUSTERED 
(
[Key] ASC 
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, 
ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON, FILLFACTOR = 90) ON [PRIMARY] 
) ON [PRIMARY] 
GO 

Answer 1

如何不发布OrderUpdateQueue表的架构，我相信pk是OrderNumber字段。您可以尝试将您的触发器更改为：

ALTER Trigger [dbo].[SO_SALESORDERHEADER_onOrderChange] 
ON [dbo].[SO_SalesOrderHeader] 
FOR INSERT, UPDATE 
AS 
    SET NOCOUNT ON; 
    --+ 
    INSERT INTO dbo.OrderUpdateQueue (SourceId, OrderNumber, Action) 

SELECT DISTINCT 
      N'SO', Inserted.SALESORDERNO, N'U' 
     FROM 
      Inserted 
     WHERE not exists (SELECT 1 FROM dbo.OrderUpdateQueue where Inserted.SALESORDERNO = OrderUpdateQueue.OrderNumber) 

UPDATE MO 
    SET MO.[ShipDate] = I.ShipExpireDate 
    FROM [BACKEND_db].[dbo].[Order] MO 
    INNER JOIN Inserted I ON I.SalesOrderNo = MO.OrderId 
    WHERE MO.ShipDate <> I.ShipExpireDate;