SQL查詢更新並在表中插入數據

Question

我正在嘗試更新我的表，我想檢查是否有一條記錄，然后再不執行任何操作；如果它有所不同，它將對其進行更改；如果不存在，則插入新記錄，這是我的表字段：

id  res-id   req-id   IsActive
--  ------   ------   --------

這是我的存儲過程：

@Res_id int,
@Opt_id int,
@IsActive int
AS 
SET NOCOUNT ON 
SET XACT_ABORT ON  

BEGIN
IF EXISTS (SELECT * FROM [dbo].[res_opt_junc]
            WHERE [Res_id]=@Res_id AND [Opt_id]=@Opt_id AND [IsActive]=1 AND          @IsActive=1)
        BEGIN
        RETURN;
        END; 

ELSE IF EXISTS (SELECT * FROM [dbo].[res_opt_junc] 
            WHERE [Res_id]=@Res_id AND [Opt_id]=@Opt_id AND [IsActive]=0 AND @IsActive=1)
        BEGIN
            UPDATE [dbo].[res_opt_junc]
            SET    [Res_id] = @Res_id, [Opt_id] = @Opt_id, [IsActive] = @IsActive
            WHERE  [Res_id]=@Res_id AND [Opt_id]=@Opt_id AND [IsActive]=0 AND @IsActive=1           
        RETURN;
        END;
ELSE IF EXISTS (SELECT * FROM [dbo].[res_opt_junc] 
            WHERE [Res_id]=@Res_id AND [Opt_id]=@Opt_id AND [IsActive]=1 AND @IsActive=0)
        BEGIN
            UPDATE [dbo].[res_opt_junc]
            SET    [Res_id] = @Res_id, [Opt_id] = @Opt_id, [IsActive] = @IsActive
            WHERE  [Res_id]=@Res_id AND [Opt_id]=@Opt_id AND [IsActive]=1 AND @IsActive=0
            RETURN;
        END;
ELSE IF NOT EXISTS (SELECT * FROM [dbo].[res_opt_junc]
            WHERE [Res_id]=@Res_id AND [Opt_id]=@Opt_id)
        BEGIN
            INSERT INTO [dbo].[res_opt_junc] ([Res_id],[Opt_id],[IsActive])
            VALUES (@Res_id , @Opt_id  , @IsActive);
            RETURN;
        END;
END

我不知道為什么表中的數據重復了；

Answer 1

MERGE語句聽起來像是完成工作的工具。

例：

MERGE [dbo].[res_opt_junc] roj
USING (SELECT @Res_id AS Res_id, @Opt_id AS Opt_id, @IsActive AS IsActive) AS nv
ON roj.Res_id = nv.Res_id AND roj.Opt_id = nv.Opt_Id
WHEN MATCHED THEN
    UPDATE SET roj.IsActive = nv.IsActive
WHEN NOT MATCHED THEN
    INSERT (Res_id, Opt_id, IsActive) VALUES (nv.Res_id, nv.Opt_id, nv.IsActive)
;

當然，假設Res_id和Opt_id是主鍵的組件。