简单说下 Winform 的分页快速开发框架必须要实现的几个功能之一

简单说下 Winform 的分页快速开发框架必须要实现的几个功能之一

分页非为前端分页  和 后端分页，前端分页只有适用于B/S，B/S的呈现速度远远不如C/S，而C/S则没有这个问题，所以分页必然是后端分页

这里先要说明WinForm分页和Web分页都会存在一个问题：查两次(一次取得页面总数，一次取得当前页数据)

所以分页是需要数据特别大的时候才具有优化的意义，比如查询100条数据是1ms 查询1000条数据是1.1s如果使用分页，那么查询的耗时基本上就是2ms(算上嵌套查询的话是3ms)，so自行掂量

控件网上有很多不多说了

说下sql(EF的略过)

-------这就是多出的一次查询，为了取得总的页数
DECLARE @Total INT
SELECT @Total = COUNT(0) 
FROM Sys_Button A
WHERE 1 = 1 
AND A.IsDelete = 0
AND ISNULL(A.Button_Name,'') LIKE '%'+ ISNULL(@cButton_Name,ISNULL(A.Button_Name,'')) +'%'
AND ISNULL(A.Button_Nick,'') LIKE '%'+ ISNULL(@cButton_Nick,ISNULL(A.Button_Nick,'')) +'%'
AND ISNULL(A.Button_Hint,'') LIKE '%'+ ISNULL(@cButton_Hint,ISNULL(A.Button_Hint,'')) +'%'
AND ISNULL(A.Button_Sub,'') LIKE '%'+ ISNULL(@cButton_Sub,ISNULL(A.Button_Sub,'')) +'%'

SELECT B.* FROM(

SELECT A.Button_Id ,A.Button_Name , 
----这里就是重点实现分页的代码了
@Total PageRecord ,ROW_NUMBER() OVER (ORDER BY Page_Nick,A.Button_Sort ) Record_Id, (@Total / @PageSize) + 1 PageCount 
FROM Sys_Button A 
LEFT JOIN Sys_Page B ON A.Button_Page = B.Page_Id
WHERE 1 = 1
AND A.IsDelete = 0
AND ISNULL(A.Button_Name,'') LIKE '%'+ ISNULL(@cButton_Name,ISNULL(A.Button_Name,'')) +'%'
AND ISNULL(A.Button_Nick,'') LIKE '%'+ ISNULL(@cButton_Nick,ISNULL(A.Button_Nick,'')) +'%'
AND ISNULL(A.Button_Hint,'') LIKE '%'+ ISNULL(@cButton_Hint,ISNULL(A.Button_Hint,'')) +'%'
AND ISNULL(A.Button_Sub,'') LIKE '%'+ ISNULL(@cButton_Sub,ISNULL(A.Button_Sub,'')) +'%'

) B
WHERE B.Record_Id > (@PageIndex - 1) * @PageSize
AND B.Record_Id <= (@PageIndex) * @PageSize
ORDER BY Page_Nick, Button_Sort