Question

我有一张表FlowTrack：

CREATE TABLE [dbo].[FlowTrack]
(
    [RowID] [tinyint] IDENTITY(1,1) NOT NULL,
    [ApplicationNo] [varchar](50) NOT NULL,
    [StatusID] [tinyint] NOT NULL,
    [UpdateType] [varchar](100) NULL,
    [CreatedDate] [datetime] NULL,
    [CreatedBy] [varchar](50) NULL
) ON [PRIMARY]

示例数据：

RowID   ApplicationNo   StatusID    UpdateType  CreatedDate CreatedBy
1   BPS/ANA/MO/7/0146215    1   3   2015-06-17 12:59:56.387 Tests
2   BPS/BHI/20/0164615  1   3   2015-06-17 12:57:57.727 Tester
3   BPS/BHI/6/0204815   1   3   2015-06-17 12:57:57.727 Tester

我的程序：

ALTER procedure Flowtrack
   (@APPNO  varchar(50),
    @vc_status CHAR(1),
    @CreatedBy varchar(50) )
AS 
BEGIN 
    MERGE INTO [dbo].Flowtrack AS target
    USING (SELECT ApplicationNo, StatusID 
           FROM Flowtrack 
           WHERE ApplicationNo = @APPNO AND [StatusID] = @vc_status) AS source
        ON target.ApplicationNo = Source.ApplicationNo

    WHEN MATCHED THEN
       UPDATE 
          SET 
             target.ApplicationNo = source.ApplicationNo,
             target.StatusID = source.StatusID,
             target.UpdateType = 3,
             target.CreatedDate = getdate(),
             target.CreatedBy = @CreatedBy

    WHEN NOT MATCHED BY TARGET THEN
       INSERT
           ([ApplicationNo], [StatusID], [UpdateType],
            [CreatedDate], [CreatedBy])
       VALUES (source.ApplicationNo, source.StatusID, 3,
               getdate(), @CreatedBy);
end

当我进行更新时，它正在更新

EXEC Flowtrack 'BPS/ANA/MO/7/0146215',3,'Tests'

但是在尝试插入时，它没有插入新记录

我无法找出未插入的原因

插入新申请号

EXEC Flowtrack 'BPS/ANA/MO/7',3,'Test'

Answer 1

问题在于：

MERGE INTO [dbo].Flowtrack AS target
USING (SELECT ApplicationNo, StatusID 
       FROM Flowtrack 
       WHERE ApplicationNo = @APPNO AND [StatusID] = @vc_status) AS source
    ON target.ApplicationNo = Source.ApplicationNo
    AND target.StatusID = Source.StatusID

问题是当您传递新的AppNo时，source为空且没有任何内容可以插入。

更改为：

MERGE INTO [dbo].Flowtrack AS target
USING (SELECT ApplicationNo, StatusID 
       FROM (VALUES(@APPNO, @vc_status, @CreatedBy)) t(ApplicationNo, StatusID , CreatedBy)
      ) AS source
    ON target.ApplicationNo = Source.ApplicationNo
    AND target.StatusID = Source.StatusID

在发生更新的Merge中不会发生插入

1 个答案: