什么是使用SQL Server中的条件从存储过程调用存储过程的正确语法

Question

从存储过程中调用存储过程时，混淆了条件语句。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] 

另外的东西，我知道我还没有在我的代码照顾的是，我还需要采取参数@CompetitionId我去入过过程。

Answer 1

为什么不只是使用IF声明？

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

你可以做你想做的事情，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 

或许你应该创建一个新的存储过程，是以@Competition.CompFormat作为参数，然后它里面，使用IF语句从查询的表来决定。