Sql DESC和ASC作为存储过程中的参数

我使用以下SP为新闻文章列表分页。您可以猜到，

@count

是要返回的行数，

@start

是从中选择行的索引（按内部查询排序），

@orderby

表示要排序的列，

@orderdir

表示是按一个方向排序还是按另一个方向排序。我最初的疑问是 ，然后添加

@orderdir

参数

ALTER PROCEDURE [mytable].[news_editor_paginate]
    @count int,
    @start int,
    @orderby int,
    @orderdir int
AS 
BEGIN
    SET NOCOUNT ON; 
    SELECT TOP (@count) * FROM 
    (  
        SELECT ne.*,n.publishstate, 
            (CASE WHEN @orderdir = 1 THEN
                ROW_NUMBER() OVER (
                    ORDER BY                    
                        CASE WHEN @orderby = 0 THEN ne.[time] END DESC,
                        CASE WHEN @orderby = 1 THEN ne.lastedit END DESC,    
                        CASE WHEN @orderby = 2 THEN ne.title END ASC
                    )
            WHEN @orderdir = 2 THEN
                ROW_NUMBER() OVER (
                    ORDER BY                    
                        CASE WHEN @orderby = 0 THEN ne.[time] END ASC,    
                        CASE WHEN @orderby = 1 THEN ne.lastedit END ASC,
                        CASE WHEN @orderby = 2 THEN ne.title END DESC
                    )
                END
            ) AS num
            FROM news_edits AS ne
            LEFT OUTER JOIN news AS n
            ON n.editid = ne.id 
        ) 
     AS a
    WHERE num > @start
END

---

现在实际上没有什么问题，但是

@orderby

参数不起作用。如果提供1作为

@orderdir

参数，它将给出与我提供2作为该参数完全相同的结果。

不是对每一行都计算行号，但是case语句是这样的，因此无论是什么情况，都必须使用rownum

ALTER PROCEDURE [mytable].[news_editor_paginate]
    @count int,
    @start int,
    @orderby int,
    @orderdir int
AS 
BEGIN
    SET NOCOUNT ON; 
    SELECT TOP (@count) * FROM 
    (  
        SELECT ne.*,n.publishstate, 
            (CASE WHEN @orderdir = 1 THEN
                ROW_NUMBER() OVER (
                    ORDER BY                    
                        CASE WHEN @orderby = 0 THEN ne.[time] END DESC,
                        CASE WHEN @orderby = 1 THEN ne.lastedit END DESC,    
                        CASE WHEN @orderby = 2 THEN ne.title END ASC
                    )
            WHEN @orderdir = 2 THEN
                ROW_NUMBER() OVER (
                    ORDER BY                    
                        CASE WHEN @orderby = 0 THEN ne.[time] END ASC,    
                        CASE WHEN @orderby = 1 THEN ne.lastedit END ASC,
                        CASE WHEN @orderby = 2 THEN ne.title END DESC
                    )
                END
            ) AS num
            FROM news_edits AS ne
            LEFT OUTER JOIN news AS n
            ON n.editid = ne.id 
        ) 
     AS a
    WHERE num > @start
END

请尝试以下方法：

            ROW_NUMBER() OVER (
                ORDER BY                    
                    CASE WHEN @orderby = 0 AND @orderdir = 1 THEN ne.[time] END DESC,    
                    CASE WHEN @orderby = 0 AND @orderdir = 2 THEN ne.[time] END ASC,    
                    CASE WHEN @orderby = 1 AND @orderdir = 1 THEN ne.lastedit END DESC,
                    CASE WHEN @orderby = 1 AND @orderdir = 2 THEN ne.lastedit END ASC,
                    CASE WHEN @orderby = 2 AND @orderdir = 1 THEN ne.title END ASC
                    CASE WHEN @orderby = 2 AND @orderdir = 2 THEN ne.title END DESC
                )

这对我来说很好-（在哪里，按顺序，方向，偏移提取）

---

是的，这正是我想要的，现在你已经写下来了，这看起来很明显。谢谢，我得等一下把这个标记为答案。不用担心。当排号出来的时候，我对这些东西摸了几次头。这能回答你的问题吗@也许是劳尔迪戈，但这是9年前的事了，当时公认的答案非常有效，所以我就不谈了。