这里面介绍一下常用的分页方法:
1.使用top来分页
select top @pageSize * from table where id not in (select top @pageSize*(@pageIndex-1) id from table)
SELECT * FROM ( SELECT TOP 页面容量 * FROM ( SELECT TOP 页面容量*当前页码 * FROM 表 WHERE 条件 ORDER BY 字段A ASC ) AS TEMPTABLE1 ORDER BY 字段A DESC ) AS TEMPTABLE2 ORDER BY 字段A ASC
2.使用 ROW_NUMBER()OVER
SELECT * FROM (SELECT ROW_NUMBER() OVER (order by T.字段名 desc )AS Row, T.* from 表名 T WHERE 条件 ) TT WHERE TT.Row between 起始位置 and 结束位置; StringBuilder strSql = new StringBuilder(); strSql.Append("SELECT * FROM ( "); strSql.Append(" SELECT ROW_NUMBER() OVER ("); if (!string.IsNullOrWhiteSpace(orderby.Trim())) { strSql.Append("order by T." + orderby); } else { strSql.Append("order by T.ID desc"); } strSql.Append(")AS Row, T.* from TableName T "); if (!string.IsNullOrWhiteSpace(strWhere.Trim())) { strSql.Append(" WHERE " + strWhere); } strSql.Append(" ) TT"); strSql.AppendFormat(" WHERE TT.Row between {0} and {1}", startIndex, endIndex);
3.使用分页存储过程
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[sys_Page_v2]') and OBJECTPROPERTY(id, N'IsProcedure') = 1) drop procedure [dbo].[sys_Page_v2] GO CREATE PROCEDURE [dbo].[sys_Page_v2] @PCount int output, --总页数输出 @RCount int output, --总记录数输出 @sys_Table nvarchar(100), --查询表名 @sys_Key varchar(50), --主键 @sys_Fields nvarchar(500), --查询字段 @sys_Where nvarchar(3000), --查询条件 @sys_Order nvarchar(100), --排序字段 @sys_Begin int, --开始位置 @sys_PageIndex int, --当前页数 @sys_PageSize int --页大小 AS SET NOCOUNT ON SET ANSI_WARNINGS ON IF @sys_PageSize < 0 OR @sys_PageIndex < 0 BEGIN RETURN END DECLARE @new_where1 NVARCHAR(3000) DECLARE @new_order1 NVARCHAR(100) DECLARE @new_order2 NVARCHAR(100) DECLARE @Sql NVARCHAR(4000) DECLARE @SqlCount NVARCHAR(4000) DECLARE @Top int if(@sys_Begin <=0) set @sys_Begin=0 else set @sys_Begin=@sys_Begin-1 IF ISNULL(@sys_Where,'') = '' SET @new_where1 = ' ' ELSE SET @new_where1 = ' WHERE ' + @sys_Where IF ISNULL(@sys_Order,'') <> '' BEGIN SET @new_order1 = ' ORDER BY ' + Replace(@sys_Order,'desc','') SET @new_order1 = Replace(@new_order1,'asc','desc') SET @new_order2 = ' ORDER BY ' + @sys_Order END ELSE BEGIN SET @new_order1 = ' ORDER BY ID DESC' SET @new_order2 = ' ORDER BY ID ASC' END SET @SqlCount = 'SELECT @RCount=COUNT(1),@PCount=CEILING((COUNT(1)+0.0)/' + CAST(@sys_PageSize AS NVARCHAR)+') FROM ' + @sys_Table + @new_where1 EXEC SP_EXECUTESQL @SqlCount,N'@RCount INT OUTPUT,@PCount INT OUTPUT', @RCount OUTPUT,@PCount OUTPUT IF @sys_PageIndex > CEILING((@RCount+0.0)/@sys_PageSize) --如果输入的当前页数大于实际总页数,则把实际总页数赋值给当前页数 BEGIN SET @sys_PageIndex = CEILING((@RCount+0.0)/@sys_PageSize) END set @sql = 'select '+ @sys_fields +' from ' + @sys_Table + ' w1 ' + ' where '+ @sys_Key +' in (' +'select top '+ ltrim(str(@sys_PageSize)) +' ' + @sys_Key + ' from ' +'(' +'select top ' + ltrim(STR(@sys_PageSize * @sys_PageIndex + @sys_Begin)) + ' ' + @sys_Key + ' FROM ' + @sys_Table + @new_where1 + @new_order2 +') w ' + @new_order1 +') ' + @new_order2 print(@sql) Exec(@sql) GO
create proc [dbo].[pro_commonpage] ( @pageindex int, ---当前页的索引 @pagesiz int,--一页显示多少条 @tablename nvarchar(100),---要分页的表名 @prikey varchar(50),--要分页的表名的主键 @condtion varchar(5000),----查询条件 @pagecount int out----按照查询条件查询出的总页数 ) as -----第一步构建查询的sql语句-------- declare @sql nvarchar(4000), ---查询语句 @recrdcount int,----记录数据的总行数 @startindex int,---当前页的第一条数据的行号 @endindex int----当前页的最后一条数据的行号 set @sql = 'Select @rCount= count(*) From '+@tablename+' Where 1= 1 ';---查询除所有的数据并得到数据行数 if @condtion is not null and @condtion <>N''---当查询条件不为空的时候和不等于“” begin set @sql=@sql+@condtion;---@sql+查询条件 end print @sql ----利用sp_executesql这个存储过程来执行@sql, --N'@rcount int out 同@sql中的@rcount对应声明变量,将@recrdcount赋值替换@rcount exec sp_executesql @sql,N'@rcount int out',@recrdcount out; ---计算最大分页数 set @pagecount=CEILING(@recrdcount*1.0/@pagesiz);--ceiling函数就是将小数位抹去并在整数位加1, if(@pageindex>@pagecount)---当当前页的页码大于最大页的页码 begin set @pageindex=@pagecount ---设置当前页的页码为最大页的页码 end set @startindex=(@pageindex-1)*@pagesiz+1---设置当前页的起始行号 set @endindex =@pageindex*@pagesiz ----设置当前页的最后一条数据的行号 ---构建分页的sql set @sql='' set @sql='select row_number() over (order by '+@prikey+' asc)as rowid,*from ' + @tablename +' where 1=1'---开窗函数获取当前查询表的数据行数 if @condtion is not null and @condtion <>N'' --如果查询条件不为空 begin set @sql=@sql+@condtion ---为sql加上查询条件 end set @sql = 'Select * From ('+@sql+') as tc where tc.rowid between '+convert(varchar(5),@startIndex)+' and '+convert(varchar(5),@endIndex)+''; print @sql exec (@sql) GO
扫描二维码关注公众号,回复:
1229668 查看本文章