sql - 使用 SQL Server 中的条件从存储过程中调用存储过程的正确语法是什么

Question

我在从存储过程中调用存储过程时弄乱了条件语句。谁能帮我吗？

    CREATE PROCEDURE [dbo].[sp_Leaderboard] 

    @CompetitionId INTEGER

    AS

    DECLARE @Competition TABLE
    (CompId INTEGER,
    CompFormat NVARCHAR(10)
    )
    INSERT INTO @Competition
    SELECT CompetitionId, CompetitionFormatType
    FROM dbo.Competitions 
LEFT JOIN dbo.CompetitionFormat ON dbo.Competitions.CompetitionFormatId = dbo.CompetitionFormat.CompetitionFormatId
    WHERE CompetitionId = @CompetitionId


    CASE WHEN @Competition.CompFormat = "Strokes" THEN EXEC [dbo].[sp_Strokes] ELSE EXEC [dbo].[sp_Stableford]

此外，我知道我在我的代码中没有考虑到的一点是，我还需要将参数 @CompetitionId 带入我要去的任何程序中。

Answer 1

为什么不直接使用IF语句？

IF (SELECT TOP 1 CompFormat FROM @Competition) = 'Strokes'
   BEGIN
       EXEC [dbo].[sp_Strokes] @CompetitionId 
   END
ELSE
   BEGIN
       EXEC [dbo].[sp_Stableford] @CompetitionId 
   END

Answer 2

您可以随心所欲地同时消除表变量。试试这个：

DECLARE @CompFormat varchar(50)

SELECT @CompFormat = CompetitionFormatType
FROM dbo.Competitions 
LEFT JOIN dbo.CompetitionFormat 
    ON dbo.Competitions.CompetitionFormatId = dbo.CompetitionFormat.CompetitionFormatId
WHERE CompetitionId = @CompetitionId

IF @CompFormat = 'Strokes'
BEGIN
    EXEC [dbo].[sp_Strokes] @CompetitionId
END
ELSE 
BEGIN
    EXEC [dbo].[sp_Stableford] @CompetitionId
END

或者，也许您应该创建一个以 为参数的新存储过程，@Competition.CompFormat然后在其中使用 IF 语句来决定从哪个表中查询。