Question

我正在使用以下存储过程从表中选择数据到目前为止工作正常。

现在我想创建两个不同的案例而不重复整个查询：如果输入@selection =“active”，则选择不等于statusX =“已发布”的所有内容，否则选择等于statusX =“已发布”的所有内容。

有谁能告诉我如何在这里实现这个目标？

我的存储过程（缩减列）：

ALTER PROCEDURE [dbo].[FetchRequests]
    @selection nvarchar(20)
AS
BEGIN
    SET NOCOUNT ON;
    SELECT      col1,
                col2,
                col3,
                col4,
                col5,
                statusX,
                logStatus,
                logID
    FROM        LogRequests
    WHERE       logStatus = 'active'
    ORDER BY    logID desc
    FOR XML PATH('cols'), ELEMENTS, TYPE, ROOT('ranks')

END

非常感谢你提供任何帮助，蒂姆。

Answer 1

您可以使用条件 WHERE 子句：

ALTER PROCEDURE [dbo].[FetchRequests]
    @selection nvarchar(20)
AS
BEGIN
    SET NOCOUNT ON;
    SELECT      col1,
                col2,
                col3,
                col4,
                col5,
                statusX,
                logStatus,
                logID
    FROM        LogRequests
    WHERE       logStatus = 'active'
    AND ((statusX <> 'Published' AND @selection = 'active')
    OR (statusX = 'Published' AND @selection <> 'active'))
    ORDER BY    logID desc
    FOR XML PATH('cols'), ELEMENTS, TYPE, ROOT('ranks')

END

Answer 2

在AND：

中添加WHERE条款

AND (@selection = 'active') = (StatusX <> 'Published')

（我看到它是其他海报提出的两条线的组合。好吧，我猜的味道问题:)）

Answer 3

怎么样

where 
(@selection = 'active' and statusX != 'Published') 
or
(@selection != 'active' and statusX = 'Published')

Answer 4

您可以尝试类似

的内容

SELECT      col1,
            col2,
            col3,
            col4,
            col5,
            statusX,
            logStatus,
            logID
FROM        LogRequests
WHERE       logStatus = 'active'
AND         (
                    (@selection = "active" AND statusX <> "Published")
                OR  (@selection <> "active" AND statusX = "Published")
            )
ORDER BY    logID desc
FOR XML PATH('cols'), ELEMENTS, TYPE, ROOT('ranks')

Answer 5

ALTER PROCEDURE [dbo].[FetchRequests]
    @selection nvarchar(20)
AS
BEGIN
Declare @query as nvarchar(4000)

@query=
    'SET NOCOUNT ON;
    SELECT      col1,
                col2,
                col3,
                col4,
                col5,
                statusX,
                logStatus,
                logID
    FROM        LogRequests
    WHERE       logStatus = ''active'' and statusX ' + 
    Select case when @selection = 'active' then '<>'
              else '='
    END + '''Published''
    ORDER BY    logID desc
    FOR XML PATH(''cols''), ELEMENTS, TYPE, ROOT(''ranks'')'
execute @query
END

SQL Server：如何使用if else语句从同一个表中选择不同的数据

5 个答案: