Question

我正在编写一个存储过程，该过程根据用户角色运行不同的选择，这只是展示我的意图的一个示例，因为我有很多角色要使用。

IF OBJECT_ID('dbo.spSelectArtigos') IS NOT NULL
DROP PROCEDURE spSelectArtigos
GO
CREATE PROCEDURE spSelectArtigos 
    @IdUser int,
    @Acesso nvarchar(20)

AS
BEGIN
    IF(@Acesso = 'User')
        SELECT col1,col2 from table1 where IdUser = @IdUser
    IF(@Acesso = 'Logistica')
        SELECT col1,col2,col3 from table1 where IdUser = @IdUser  
    IF(@Acesso = 'Admin')
        SELECT * From table1 
END

有没有一种更有效的方法，可以使用某种逻辑用更少的代码来做到这一点？

Answer 1

IDK为什么我添加了一个检查以确保用户实际存在，但这并不是一个坏主意

IF OBJECT_ID('dbo.spSelectArtigos') IS NOT NULL
DROP PROCEDURE spSelectArtigos
GO
CREATE PROCEDURE spSelectArtigos 
    @IdUser int,
    @Acesso nvarchar(20)

AS
BEGIN
    CASE 
        WHEN @Acesso ='User' 
            AND
                EXISTS (SELECT * FROM table1 WHERE IdUser = @IdUser)
            THEN 
              SELECT col1,col2 from table1 where IdUser = @IdUser

        WHEN @Acesso ='Logistica' Then
            AND
                EXISTS (SELECT * FROM table1 WHERE IdUser = @IdUser)
            THEN        
              SELECT col1,col2,col3 from table1 where IdUser = @IdUser  

        WHEN @Acesso ='Admin'
            AND
                EXISTS (SELECT * FROM table1 WHERE IdUser = @IdUser)
            THEN        
              SELECT * From table1 
    END
END

Answer 2

这是一种怪诞的方式，但很简洁。

IF OBJECT_ID('dbo.spSelectArtigos') IS NOT NULL
DROP PROCEDURE spSelectArtigos
GO
CREATE PROCEDURE spSelectArtigos 
    @IdUser int,
    @Acesso nvarchar(20)

AS
BEGIN
    DECLARE @Result TABLE(A INT,B INT,C INT,D INT)
    INSERT @Result SELECT A,B,C,D FROM table1 WHERE idUser=@idUser

    IF(@Acesso = 'User')
        UPDATE @Result SET C=NULL, D=NULL 
    IF(@Acesso = 'Logistica')
        UPDATE @Result SET D=NULL 
    SELECT * From @Result 
END

另一种处理ID的方法

SELECT 
    A=CASE WHEN @Acesso >= 10 THEN A ELSE NULL END,
    B=CASE WHEN @Acesso >= 20 THEN B ELSE NULL END,
    C=CASE WHEN @Acesso >= 99 THEN C ELSE NULL END
FROM 
    table1 
WHERE 
    idUser=@idUser

根据参数SQL返回具有不同列的表

2 个答案: