分页 SQL 查询中的动态排序依据

Question

我想在存储过程中使用分页和动态orderby 子句（多于一列）。我确实尝试过，但给了我一个错误

看来我不能使用 Row_number() 而不是 rank()

窗口函数不能在另一个窗口函数或聚合的上下文中使用。

除了 linq to sql 之外，有没有其他方法可以实现这一目标

SELECT  [t8].[AssetId], 
            [t8].[WorkOrderId], 
            [t8].[IssueDescription] AS [WorkOrderDescription], 
            [t8].[value] AS [Type], 
            [t8].[WorkOrderStatusTypeName] AS [Status],
            [t8].[value2] AS [StartDate], 
            [t8].[CompletedDate] AS [CompleteDate], 
            [t8].[value22] AS [CompletedBy], 
            ISNULL([t8].[value3],0) AS [Hours]
    FROM    (
                SELECT  ROW_NUMBER() 
                    OVER (ORDER BY  CASE WHEN @sortColumnName = 'default' THEN (RANK() over( order by [t7].[WorkOrderStatusTypeId] ASC, [t7].[WorkOrderId])) END ,
                                    CASE WHEN @sortColumnName = 'WorkOrderId' AND @sortOrder = 'asc' THEN [t7].[WorkOrderId] END ASC,
                                    CASE WHEN @sortColumnName = 'WorkOrderId' AND @sortOrder = 'desc' THEN [t7].[WorkOrderId] END DESC
                    ) AS [ROW_NUMBER],  
                    [t7].[AssetId], 
                    [t7].[WorkOrderId], 
                    [t7].[IssueDescription], 
                    [t7].[value], 
                    [t7].[WorkOrderStatusTypeName], 
                    [t7].[value2], 
                    [t7].[CompletedDate],
                    [t7].[value22], 
                    [t7].[value3]
            from    --Different tables      
            ) as t8     
    WHERE       [t8].[ROW_NUMBER] BETWEEN ((@pageIndex-1) * @pageSize)+ 1 AND @pageIndex * @pageSize
    ORDER BY    [t8].[ROW_NUMBER]

Answer 1

二手

SELECT  CASE    
        WHEN @sortColumnName ='default' AND @sortOrder = 'asc'  then row_number() over (order by [t7].[WorkOrderStatusTypeId], [t7].[CompletedDate] ASC) 
        WHEN @sortColumnName ='WorkOrderId' AND @sortOrder = 'asc'  then row_number() over (order by [t7].[WorkOrderId] ASC) 
        WHEN @sortColumnName ='WorkOrderId' AND @sortOrder = 'desc' then row_number() over (order by [t7].[WorkOrderId] DESC)
        END AS [ROW_NUMBER], 

而不是

SELECT  ROW_NUMBER() 
        OVER (ORDER BY  CASE WHEN @sortColumnName = 'default' THEN (RANK() over( order by [t7].[WorkOrderStatusTypeId] ASC, [t7].[WorkOrderId])) END ,
                        CASE WHEN @sortColumnName = 'WorkOrderId' AND @sortOrder = 'asc' THEN [t7].[WorkOrderId] END ASC,
                        CASE WHEN @sortColumnName = 'WorkOrderId' AND @sortOrder = 'desc' THEN [t7].[WorkOrderId] END DESC
        ) AS [ROW_NUMBER],

不能将 RowNumber() 和 Rank() 等嵌套窗口函数放在一起，而是可以在 case 语句中使用。

Answer 2

似乎您希望默认顺序为两列，并且您尝试使用 RANK() 试图将两个默认排序条件放在一个 CASE 中。

显然，这是不可能的。一个明显的选择似乎是将两列分成两个 CASE，重复 @sortColumnName = 'default' 条件：

ROW_NUMBER() 
OVER (ORDER BY  CASE WHEN @sortColumnName = 'default' THEN [t7].[WorkOrderStatusTypeId] END ASC,
                CASE WHEN @sortColumnName = 'default' THEN [t7].[WorkOrderId] END ASC,
                CASE WHEN @sortColumnName = 'WorkOrderId' AND @sortOrder = 'asc' THEN [t7].[WorkOrderId] END ASC,
                CASE WHEN @sortColumnName = 'WorkOrderId' AND @sortOrder = 'desc' THEN [t7].[WorkOrderId] END DESC

另一方面，很容易看出，第二个和第三个 CASE 可以合并为一个，因为当相应的条件为真时，两者都返回相同的表达式。所以，你可以这样做：

ROW_NUMBER() 
OVER (ORDER BY  CASE WHEN @sortColumnName = 'default' THEN [t7].[WorkOrderStatusTypeId] END ASC,
                CASE WHEN @sortColumnName = 'default' OR @sortColumnName = 'WorkOrderId' AND @sortOrder = 'asc' THEN [t7].[WorkOrderId] END ASC,
                CASE WHEN @sortColumnName = 'WorkOrderId' AND @sortOrder = 'desc' THEN [t7].[WorkOrderId] END DESC

如您所见，第二个 CASE 用于设置WorkOrderId ASC 的排序，无论是在参数中明确指定该列还是指定'default' 时。

Answer 3

创建 Web API 时，进行动态排序的唯一方法，尤其是在多个 colmun 上，是构建 Sql 字符串并使用内置的 sprop 'SP_EXECUTESQL' 运行它。下面是我的解决方案示例，它返回一个分页列表，按多列字符串排序，并通过输出参数返回总行数。

请注意，这样使用字符串直接拼接时，一定要先检查sql注入恶意代码的参数。这里我必须检查 SearchTerm 和 SortTerm

alter PROCEDURE [dbo].[usp_Ranking_SearchForPlayerByName]
    @SearchTerm varchar(100),
    @WeekNumber int,
    @Gender nchar(1),
    @SortTerm nvarchar(100),
    @PageSize int,
    @PageNumber int,
    @TotalCount int OUT
AS
BEGIN
    SET ANSI_NULLS, QUOTED_IDENTIFIER ON

    DECLARE @PreviousWeek int = dbo.PreviousWeekNo(@WeekNumber)
    DECLARE @Offset int = (@PageNumber - 1) * @PageSize



    DECLARE @sql nvarchar(max) = N'Select 
        h.PlayerID
        ,p.Forename as FirstName
        ,p.Surname as Lastname
        ,p.Gender as Gender
        ,''return country of residence'' as Country
        ,r.Name as Region
        ,h.Position as RankThisWeek
        ,previousWk.Position as RankLastWeek
        ,(previousWk.Position - h.Position) as Change
    From PlayerHistories h
        left outer join
            (Select * from PlayerHistories
                where WeekNumber = @PreviousWeek) previousWk on h.PlayerId = previousWk.PlayerId
        inner join Players p on h.PlayerId = p.Id
            left join Countries c on p.CountryId = c.Id
            left join Regions r on c.RegionId = r.Id
    Where h.WeekNumber = @WeekNumber And
        p.Gender = CASE When @Gender = ''M'' Then ''M'' When @Gender = ''F'' Then ''F'' Else p.gender End And
        p.FullName like ''%' + @SearchTerm + '%'' 
    Order by ' + @SortTerm + '
    OFFSET @offset ROWS FETCH NEXT @PageSize ROWS ONLY

    '   
    EXEC SP_EXECUTESQL @Sql,
        N'@PreviousWeek int, @WeekNumber int, @Gender nchar(1), @offset int, @PageSize int', 
        @PreviousWeek, @WeekNumber, @Gender, @offset, @PageSize;

    SELECT @TotalCount = 
        (SELECT Count(h.Id)
        From PlayerHistories h
            left outer join
                (Select * from PlayerHistories
                    where WeekNumber = @PreviousWeek) previousWk on h.PlayerId = previousWk.PlayerId
            inner join Players p on h.PlayerId = p.Id
        Where h.WeekNumber = @WeekNumber And
            p.Gender = CASE When @Gender = 'M' Then 'M' When @Gender = 'F' Then 'F' Else p.gender End And
            p.FullName like '%' + @SearchTerm + '%');


END

使用以下语句测试调用它：

DECLARE @op int

exec dbo.usp_Ranking_SearchForPlayerByName 'smith',201715,'','LastName DESC, Gender, FirstName',10,1, @op OUTPUT

select @op