动态订单方向

Question

我编写了一个 SP，它接受列作为参数来进行排序和方向。

我不想使用动态 SQL。

问题在于设置方向参数。

这是部分代码：

SET @OrderByColumn = 'AddedDate'
SET @OrderDirection = 1;

…

ORDER BY 
    CASE WHEN @OrderByColumn = 'AddedDate' THEN CONVERT(varchar(50), AddedDate)
        WHEN @OrderByColumn = 'Visible' THEN CONVERT(varchar(2), Visible)
        WHEN @OrderByColumn = 'AddedBy' THEN AddedBy
        WHEN @OrderByColumn = 'Title' THEN Title    
    END

Answer 1

您可以有两个几乎相同的ORDER BY项目，一个ASC和一个DESC，并延长CASE语句，以一种或另一种人总是等于一个值：

ORDER BY
      CASE WHEN @OrderDirection = 0 THEN 1
      ELSE
           CASE WHEN @OrderByColumn = 'AddedDate' THEN CONVERT(varchar(50), AddedDate)
                WHEN @OrderByColumn = 'Visible' THEN CONVERT(varchar(2), Visible)
                WHEN @OrderByColumn = 'AddedBy' THEN AddedBy
                WHEN @OrderByColumn = 'Title' THEN Title
           END
      END ASC,
      CASE WHEN @OrderDirection = 1 THEN 1
      ELSE
           CASE WHEN @OrderByColumn = 'AddedDate' THEN CONVERT(varchar(50), AddedDate)
                WHEN @OrderByColumn = 'Visible' THEN CONVERT(varchar(2), Visible)
                WHEN @OrderByColumn = 'AddedBy' THEN AddedBy           
                WHEN @OrderByColumn = 'Title' THEN Title
           END
      END DESC

Answer 2

您可以简化使用ROW_NUMBER这种种你的数据的情况下，有效地将其转换成一个方便的整数格式。特别是因为问题被标记SQL Server 2005的

此也扩展容易足以应付二级和三级排序

我用乘数再次简化了实际的SELECT语句，并减少在ORDER RBAR评价的几率

DECLARE @multiplier int;

SELECT @multiplier = CASE @Direction WHEN 1 THEN -1 ELSE 1 END;

SELECT
     Columns you actually want
FROM
    (
    SELECT
         Columns you actually want,
         ROW_NUMBER() OVER (ORDER BY AddedDate) AS AddedDateSort,
         ROW_NUMBER() OVER (ORDER BY Visible) AS VisibleSort,
         ROW_NUMBER() OVER (ORDER BY AddedBy) AS AddedBySort,
         ROW_NUMBER() OVER (ORDER BY Title) AS TitleSort
    FROM
         myTable
    WHERE
         MyFilters...
    ) foo
ORDER BY
     CASE @OrderByColumn
        WHEN 'AddedDate' THEN AddedDateSort
        WHEN 'Visible' THEN VisibleSort    
        WHEN 'AddedBy' THEN AddedBySort
        WHEN 'Title' THEN TitleSort
     END * @multiplier;

Answer 3

这是一个例子：

CREATE PROCEDURE GetProducts 
( 
    @OrderBy      VARCHAR(50), 
    @Input2       VARCHAR(30) 
) 
AS 
BEGIN 
    SET NOCOUNT ON 

    SELECT Id, ProductName, Description, Price, Quantity 
    FROM Products 
    WHERE ProductName LIKE @Input2 
    ORDER BY 
        CASE             
            WHEN @OrderBy = 'ProductNameAsc' THEN ProductName 
        END ASC, 
        CASE 
            WHEN @OrderBy = 'ProductNameDesc' THEN ProductName 
        END DESC 

END

从这里：

http://www.dominicpetifer.co.uk/Blog/21/dynamic-conditional-order-by-clause-in-sql-server-t-sql

上升和下降的措施需要将其分为单独的案例语句，并用逗号分隔。在您的服务器端代码/脚本中，请确保通过字符串将“ ASC”或“ DESC”附加到订单上，否则您可以使用两个存储的过程输入参数，用于列名称，如果需要，可以通过方向订购。

Answer 4

此工作正常，我 - （where，order by，direction，Pagination）

parameters

@orderColumn  int ,
@orderDir  varchar(20),
@start  int ,
@limit  int


select * from items
WHERE        (items.status = 1) 
order by 

CASE WHEN @orderColumn = 0 AND @orderdir = 'desc' THEN items.[category] END DESC,    
CASE WHEN @orderColumn = 0 AND @orderdir = 'asc' THEN items.[category] END ASC,    
CASE WHEN @orderColumn = 1 AND @orderdir = 'desc' THEN items.[category] END DESC,
CASE WHEN @orderColumn = 1 AND @orderdir = 'asc' THEN items.[category] END ASC,
CASE WHEN @orderColumn = 2 AND @orderdir = 'desc' THEN items.[category] END DESC,
CASE WHEN @orderColumn = 2 AND @orderdir = 'asc' THEN items.[category] END ASC

OFFSET @start ROWS FETCH NEXT @limit ROWS ONLY

Answer 5

回答，但作为公认的答案这工作得很好，只有当结果表达式THEN后具有相同类型。

ORDER BY
    CASE @OrderDirection WHEN 0 THEN
        CASE @sortColumn
           WHEN 'AddedDate' THEN CONVERT(varchar(50), AddedDate)
           WHEN 'Visible' THEN CONVERT(varchar(2), Visible)
           WHEN 'AddedBy' THEN AddedBy
           WHEN 'Title' THEN Title
        END
    END ASC,
    CASE @OrderDirection WHEN 1 THEN
        CASE @sortColumn
           WHEN 'AddedDate' THEN CONVERT(varchar(50), AddedDate)
           WHEN 'Visible' THEN CONVERT(varchar(2), Visible)
           WHEN 'AddedBy' THEN AddedBy
           WHEN 'Title' THEN Title
        END
    END DESC