Question

我想在存储过程中添加一个列，该列只是从1开始计数，而不管数据的排序方式或我正在获取的页面（使用偏移量。）

存储过程本身如下所示：

SELECT  
   e.EntityId, e.HierarchyId, e.ParentNode, e.NgageId, e.NgageParentId,
   e.Type, e.IsDeleted, e.LastIndexedDate, e.CurrentVersion, e.Level, 
   v.EntityVersionID, v.VerisonNotes, v.Title, v.[Description], v.FormID, 
   v.IsPublic, v.CreatedDate, v.LastModifiedDate, v.ExpirationDate, 
   d.DocumentID, d.OwnerId AS OwnerId, 
   o.ADUsername AS OwnerAccount, o.Name AS Author, 
   d.[Status], d.DocumentType, d.CheckoutUserId AS CheckoutUserId, 
   c.ADUsername AS CheckoutUserAccount, c.Name AS CheckoutUserName, 
   d.CheckoutDate,
   dbo.GetCommaSeperatedTags(e.EntityID) AS Tags
   --INTO #documentsTemp 
FROM 
   dbo.Entities AS e
INNER JOIN 
   dbo.EntityVersions AS v ON v.EntityID = e.EntityID AND e.CurrentVersion = v.VersionNumber
INNER JOIN 
   dbo.Documents AS d ON d.EntityVersionID = v.EntityVersionID
INNER JOIN 
   dbo.Users AS o ON o.UserID = d.OwnerId
LEFT JOIN 
   dbo.Users AS c ON c.UserID = d.CheckoutUserId
WHERE 
   [Type] = 5 
   AND NgageID = @ngageId 
   AND IsDeleted = 0
   AND dbo.CheckPermissions(e.EntityId, @userId, 'LIST') = 1
ORDER BY 
    CASE WHEN @orderBy = 'Title' THEN v.Title END,
    CASE WHEN @orderBy = 'Title' AND @desc = 1 THEN v.Title END DESC,
    CASE WHEN @orderBy = 'Author' THEN o.Name END,
    CASE WHEN @orderBy = 'Author' AND @desc = 1 THEN o.Name END DESC,
    CASE WHEN @orderBy = 'DateModified' THEN v.LastModifiedDate END,
    CASE WHEN @orderBy = 'DateModified' AND @desc = 1 THEN v.LastModifiedDate END DESC
OFFSET ((@pageNumber - 1) * @pageSize) ROWS
FETCH NEXT @pageSize ROWS ONLY;

这样做的最佳方式是什么？

谢谢，

乔

Answer 1

我看到三个选项（Gordon已经提到过两个选项，不建议使用第三个选项）：

在应用程序级别执行此操作
重复ORDER BY子句并进行一些算术
依赖于未记录的行为，结果可能不正确

以下是AdventureWorks中的选项2和3（缩短查询）：

DECLARE @pageSize int=5, @pagenumber int=2, @OrderBy varchar(20)='Name'

SELECT (ROW_NUMBER() OVER (
    ORDER BY
    CASE WHEN @OrderBy='Name' THEN Name END,
    CASE WHEN @OrderBy='ProductNumber' THEN ProductNumber END
    )-1)%@pageSize+1 as N, * 
FROM Production.Product
ORDER BY 
    CASE WHEN @OrderBy='Name' THEN Name END,
    CASE WHEN @OrderBy='ProductNumber' THEN ProductNumber END
OFFSET ((@pageNumber - 1) * @pageSize) ROWS
FETCH NEXT @pageSize ROWS ONLY

SELECT ROW_NUMBER() OVER (ORDER BY @pageSize) AS RN, *
FROM (
    SELECT * FROM Production.Product
    ORDER BY 
        CASE WHEN @OrderBy='Name' THEN Name END,
        CASE WHEN @OrderBy='ProductNumber' THEN ProductNumber END
    OFFSET ((@pageNumber - 1) * @pageSize) ROWS
    FETCH NEXT @pageSize ROWS ONLY
) X

勒兹

将序号列添加到存储过程

1 个答案: