--=============================================
-- Author:        <Author,张世民>
-- Create date: <Create 2012/05/19>
-- Description:    <千万条数据分页查询优化>
-- =============================================
--/*-----存储过程 分页处理 孙伟 2005-03-28创建 -------*/
--/*----- 对数据进行了2分处理使查询前半部分数据与查询后半部分数据性能相同 -------*/ALTER PROCEDURE [dbo].[GetPageList]
(
@tableName     nvarchar(200),        ----要显示的表或多个表的连接
@idField        nvarchar(150),        ----主表的主键
@fieldsName     nvarchar(500) = '*',    ----要显示的字段列表
@pageSize    int = 10,        ----每页显示的记录个数
@page        int = 1,        ----要显示那一页的记录
@pageCount    int = 1 output,            ----查询结果分页后的总页数
@Counts    int = 1 output,                ----查询到的记录数
@fieldSort    nvarchar(200) = null,    ----排序字段列表或条件
--@Sort        bit = 0,        ----排序方法，0为升序，1为降序(如果是多字段排列Sort指代最后一个排序字段的排列顺序(最后一个排序字段不加排序标记)--程序传参如：' SortA Asc,SortB Desc,SortC ')
@where    nvarchar(1000) = null,    ----查询条件,不需where
@Dist                 bit = 0           ----是否添加查询字段的 DISTINCT 默认0不添加/1添加
)
AS
SET NOCOUNT ON
Declare @sqlTmp nvarchar(1000)        ----存放动态生成的SQL语句
Declare @strTmp nvarchar(1000)        ----存放取得查询结果总数的查询语句
Declare @strID     nvarchar(1000)        ----存放取得查询开头或结尾ID的查询语句Declare @strSortType nvarchar(10)    ----数据排序规则A
Declare @strFSortType nvarchar(10)    ----数据排序规则BDeclare @SqlSelect nvarchar(50)         ----对含有DISTINCT的查询进行SQL构造
Declare @SqlCounts nvarchar(50)          ----对含有DISTINCT的总数查询进行SQL构造if @Dist  = 0
beginset @SqlSelect = 'select 'set @SqlCounts = 'Count(*)'
end
else
beginset @SqlSelect = 'select distinct 'set @SqlCounts = 'Count(DISTINCT '+@idField+')'
end/*if @Sort=0
begin*/set @strFSortType=' 'set @strSortType=' DESC '
/*end
else
beginset @strFSortType=' DESC 'set @strSortType=' ASC '
end*/--------生成查询语句--------
--此处@strTmp为取得查询结果数量的语句
if @where is null or @where=''     --没有设置显示条件
beginset @sqlTmp =  @fieldsName + ' From ' + @tableNameset @strTmp = @SqlSelect+' @Counts='+@SqlCounts+' FROM '+@tableNameset @strID = ' From ' + @tableName
end
else
beginset @sqlTmp = + @fieldsName + 'From ' + @tableName + ' where (1>0) ' + @whereset @strTmp = @SqlSelect+' @Counts='+@SqlCounts+' FROM '+@tableName + ' where (1>0) ' + @whereset @strID = ' From ' + @tableName + ' where (1>0) ' + @where
end----取得查询结果总数量-----
exec sp_executesql @strTmp,N'@Counts int out ',@Counts out
declare @tmpCounts int
if @Counts = 0set @tmpCounts = 1
elseset @tmpCounts = @Counts--取得分页总数set @pageCount=(@tmpCounts+@pageSize-1)/@pageSize/**当前页大于总页数 取最后一页**/if @page>@pageCountset @page=@pageCount--/*-----数据分页2分处理-------*/declare @pageIndex int --总数/页大小declare @lastcount int --总数%页大小 set @pageIndex = @tmpCounts/@pageSizeset @lastcount = @tmpCounts%@pageSizeif @lastcount > 0set @pageIndex = @pageIndex + 1elseset @lastcount = @pagesize--//***显示分页if @where is null or @where=''     --没有设置显示条件beginif @pageIndex<2 or @page<=@pageIndex / 2 + @pageIndex % 2   --前半部分数据处理begin if @page=1set @strTmp=@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fieldsName+' from '+@tableName                        +' order by '+ @fieldSort +' '+ @strFSortTypeelsebegin                    set @strTmp=@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fieldsName+' from '+@tableName+' where '+@idField+' >(select max('+ @idField +') from ('+ @SqlSelect+' top '+ CAST(@pageSize*(@page-1) as Varchar(20)) +' '+ @idField +' from '+@tableName+' order by '+ @fieldSort +' '+ @strFSortType +') AS TBMinID)'+' order by '+ @fieldSort +' '+ @strFSortTypeend    endelsebeginset @page = @pageIndex-@page+1 --后半部分数据处理if @page <= 1 --最后一页数据显示                set @strTmp=@SqlSelect+' *from ('+@SqlSelect+' top '+ CAST(@lastcount as VARCHAR(4))+' '+ @fieldsName+' from '+@tableName+' order by '+ @fieldSort +' '+ @strSortType+') AS TempTB'+' order by '+ @fieldSort +' '+ @strFSortType elseset @strTmp=@SqlSelect+' * from ('+@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fieldsName+' from '+@tableName+' where '+@idField+' <(select min('+ @idField +') from('+ @SqlSelect+' top '+ CAST(@pageSize*(@page-2)+@lastcount as Varchar(20)) +' '+ @idField +' from '+@tableName+' order by '+ @fieldSort +' '+ @strSortType+') AS TBMaxID)'+' order by '+ @fieldSort +' '+ @strSortType+') AS TempTB'+' order by '+ @fieldSort +' '+ @strFSortType endendelse --有查询条件beginif @pageIndex<2 or @page<=@pageIndex / 2 + @pageIndex % 2   --前半部分数据处理beginif @page=1set @strTmp=@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fieldsName+' from '+@tableName                        +' where 1=1 ' + @where + ' order by '+ @fieldSort +' '+ @strFSortTypeelsebegin                    set @strTmp=@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fieldsName+' from '+@tableName+' where '+@idField+' >(select max('+ @idField +') from ('+ @SqlSelect+' top '+ CAST(@pageSize*(@page-1) as Varchar(20)) +' '+ @idField +' from '+@tableName+' where (1=1) ' + @where +' order by '+ @fieldSort +' '+ @strFSortType+') AS TBMinID)'+' '+ @where +' order by '+ @fieldSort +' '+ @strFSortTypeend            endelsebegin set @page = @pageIndex-@page+1 --后半部分数据处理if @page <= 1 --最后一页数据显示set @strTmp=@SqlSelect+' * from ('+@SqlSelect+' top '+ CAST(@lastcount as VARCHAR(4))+' '+ @fieldsName+' from '+@tableName+' where (1=1) '+ @where +' order by '+ @fieldSort +' '+ @strSortType+') AS TempTB'+' order by '+ @fieldSort +' '+ @strFSortType                     elseset @strTmp=@SqlSelect+' * from ('+@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fieldsName+' from '+@tableName+' where '+@idField+' <(select min('+ @idField +') from('+ @SqlSelect+' top '+ CAST(@pageSize*(@page-2)+@lastcount as Varchar(20)) +' '+ @idField +' from '+@tableName+' where (1=1) '+ @where +' order by '+ @fieldSort +' '+ @strSortType+') AS TBMaxID)'+' '+ @where+' order by '+ @fieldSort +' '+ @strSortType+') AS TempTB'+' order by '+ @fieldSort +' '+ @strFSortType                end    end------返回查询结果-----
exec sp_executesql @strTmp
--print @strTmp
SET NOCOUNT OFF