试图返回比可用行更多的行

Question

下面是我的存储过程的示例。 当用户尝试获取的行数 (@PageSize) 多于 最后一页 (@PageNumber) 中当前可用的行数时，会出现一个问题，然后返回的结果是零，而不是即使小于传递的 PageSize 参数，也返回可用的内容。

此调用返回结果

exec [dbo].[CustomersPaginationProc] @LocationID ='0',@PageNumber=17999,@PageSize=10,@SortColumn=N'Name',@SortOrder=N'ASC'

虽然此调用没有

exec [dbo].[CustomersPaginationProc] @LocationID ='0',@PageNumber=17999,@PageSize=20,@SortColumn=N'Name',@SortOrder=N'ASC'

程序详情：

    ALTER PROCEDURE [CustomersPaginationProc]
    -- Add the parameters for the stored procedure here
    @LocationID VARCHAR(50) = NULL
    @PageNumber INT = NULL, 
    @PageSize INT = NULL,
    @SortColumn NVARCHAR(20) = NULL,
    @SortOrder NVARCHAR(4) = NULL
 AS BEGIN
 SET NOCOUNT ON;

 WITH CTE_Results AS 
(
     SELECT 
          cs.LocationID
        , cs.Name
     FROM Customers cs with (nolock)  
     WHERE
        (@LocationID IS NULL OR cs.LocationID LIKE '%' + @LocationID + '%')
),
CTE_TotalRows AS 
(
     SELECT COUNT(*) AS MaxRows FROM CTE_Results
)
SELECT * FROM CTE_Results, CTE_TotalRows
     ORDER BY
            CASE WHEN (@SortColumn IS NOT NULL AND @SortColumn = 'LocationID' AND @SortOrder= 'ASC')
                        THEN CTE_Results.LocationID
            END ASC
      OFFSET @PageSize * (@PageNumber) ROWS
      FETCH NEXT @PageSize ROWS ONLY
      OPTION (RECOMPILE)
END

Answer 1

我不明白你为什么要做乘法？为什么要完全加入？这可以简化，并在第二个参数超过可用行数时起作用。

declare @startRows int = 95
declare @nextRows int = 10

--create 100 rows
;WITH
    E1(N) AS (select 1 from (values (1),(1),(1),(1),(1),(1),(1),(1),(1),(1))dt(n)),
    E2(N) AS (SELECT 1 FROM E1 a, E1 b), --10E+2 or 100 rows
    cteTally(N) AS 
    (
        SELECT  ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) FROM E2
    )

select N 
from cteTally
order by N
offset @startRows rows
fetch next @nextRows rows only