Question

我编写了一个接受作为参数列的SP来进行排序和指导。

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，一个ASC和一个DESC，并扩展您的CASE语句，使其中一个或另一个始终等于单一值：

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

您可以使用ROW_NUMBER简化CASE，ROW_NUMBER对您的数据进行排序并有效地将其转换为方便的整数格式。特别是因为问题是标记为SQL Server 2005

这也很容易扩展到处理二级和三级排序

我使用乘数来再次简化实际的select语句并减少ORDER BY中RBAR评估的几率

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

以下是一个例子：

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

从这里开始：

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

升序和降序行动需要被分组为单独的CASE 语句，用逗号分隔。在您的服务器端代码/脚本确保将“Asc”或“Desc”附加到按字符串排序，或者你可以有两个存储过程输入参数列名称和方向顺序if 你想要的。

Answer 4

这适用于我 - （[minDist,minCentroid]=min(SqD,[],2)，where，order by，direction）

Pagination

动态订单方向

4 个答案: