二分法使用select max大量数据分页
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- --/*-----存储过程 分页处理 孙伟 2005-03-28创建 ------*/
- --/*-----存储过程 分页处理 浪尘 2008-9-1修改----------*/
- --/*----- 苗苗老师 2009-11-08 修改 --------------------*/
- --/*----- 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 proc_paged_2part_selectMax
- (
- @tblName nvarchar(200), ----要显示的表或多个表的连接
- @fldName 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
- @fldSort 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 ')
- @strCondition nvarchar(1000) = null, ----查询条件,不需where
- @ID nvarchar(150), ----主表的主键
- @Dist bit = 0, ----是否添加查询字段的 DISTINCT 默认0不添加/1添加
- @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
- )
- 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B
- Declare @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
- declare @timediff datetime --耗时测试时间差
- select @timediff=getdate()
- if @Dist = 0
- begin
- set @SqlSelect = 'select '
- set @SqlCounts = 'Count(*)'
- end
- else
- begin
- set @SqlSelect = 'select distinct '
- set @SqlCounts = 'Count(DISTINCT '+@ID+')'
- end
- if @Sort=0
- begin
- set @strFSortType=' ASC '
- set @strSortType=' DESC '
- end
- else
- begin
- set @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 @strCondition is null or @strCondition='' --没有设置显示条件
- begin
- set @sqlTmp = @fldName + ' From ' + @tblName
- set @strTmp = @SqlSelect+' @Counts='+@SqlCounts+' FROM '+@tblName
- set @strID = ' From ' + @tblName
- end
- else
- begin
- set @sqlTmp = @fldName + 'From ' + @tblName + ' where (1>0) ' + @strCondition
- set @strTmp = @SqlSelect+' @Counts='+@SqlCounts+' FROM '+@tblName + ' where (1>0) ' + @strCondition
- set @strID = ' From ' + @tblName + ' where (1>0) ' + @strCondition
- 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 = 0
- set @tmpCounts = 1
- else
- set @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>@pageCount
- set @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/@pageSize
- set @lastcount = @tmpCounts%@pageSize
- if @lastcount > 0
- set @pageIndex = @pageIndex + 1
- else
- set @lastcount = @pagesize
- --//***显示分页
- if @strCondition is null or @strCondition='' --没有设置显示条件
- begin
- if @pageIndex<2 or @page<=@pageIndex / 2 + @pageIndex % 2 --前半部分数据处理
- begin
- if @page=1
- set @strTmp=@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fldName+' from '+@tblName
- +' order by '+ @fldSort +' '+ @strFSortType
- else
- begin
- if @Sort=1
- begin
- set @strTmp=@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fldName+' from '+@tblName
- +' where '+@ID+' <(select min('+ @ID +') from ('+ @SqlSelect+' top '+ CAST(@pageSize*(@page-1) as Varchar(20)) +' '+ @ID +' from '+@tblName
- +' order by '+ @fldSort +' '+ @strFSortType+') AS TBMinID)'
- +' order by '+ @fldSort +' '+ @strFSortType
- end
- else
- begin
- set @strTmp=@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fldName+' from '+@tblName
- +' where '+@ID+' >(select max('+ @ID +') from ('+ @SqlSelect+' top '+ CAST(@pageSize*(@page-1) as Varchar(20)) +' '+ @ID +' from '+@tblName
- +' order by '+ @fldSort +' '+ @strFSortType+') AS TBMinID)'
- +' order by '+ @fldSort +' '+ @strFSortType
- end
- end
- end
- else
- begin
- 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))+' '+ @fldName+' from '+@tblName
- +' order by '+ @fldSort +' '+ @strSortType+') AS TempTB'+' order by '+ @fldSort +' '+ @strFSortType
- else
- if @Sort=1
- begin
- set @strTmp=@SqlSelect+' * from ('+@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fldName+' from '+@tblName
- +' where '+@ID+' >(select max('+ @ID +') from('+ @SqlSelect+' top '+ CAST(@pageSize*(@page-2)+@lastcount as Varchar(20)) +' '+ @ID +' from '+@tblName
- +' order by '+ @fldSort +' '+ @strSortType+') AS TBMaxID)'
- +' order by '+ @fldSort +' '+ @strSortType+') AS TempTB'+' order by '+ @fldSort +' '+ @strFSortType
- end
- else
- begin
- set @strTmp=@SqlSelect+' * from ('+@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fldName+' from '+@tblName
- +' where '+@ID+' <(select min('+ @ID +') from('+ @SqlSelect+' top '+ CAST(@pageSize*(@page-2)+@lastcount as Varchar(20)) +' '+ @ID +' from '+@tblName
- +' order by '+ @fldSort +' '+ @strSortType+') AS TBMaxID)'
- +' order by '+ @fldSort +' '+ @strSortType+') AS TempTB'+' order by '+ @fldSort +' '+ @strFSortType
- end
- end
- end
- else --有查询条件
- begin
- if @pageIndex<2 or @page<=@pageIndex / 2 + @pageIndex % 2 --前半部分数据处理
- begin
- if @page=1
- set @strTmp=@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fldName+' from '+@tblName
- +' where 1=1 ' + @strCondition + ' order by '+ @fldSort +' '+ @strFSortType
- else if(@Sort=1)
- begin
- set @strTmp=@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fldName+' from '+@tblName
- +' where '+@ID+' <(select min('+ @ID +') from ('+ @SqlSelect+' top '+ CAST(@pageSize*(@page-1) as Varchar(20)) +' '+ @ID +' from '+@tblName
- +' where (1=1) ' + @strCondition +' order by '+ @fldSort +' '+ @strFSortType+') AS TBMinID)'
- +' '+ @strCondition +' order by '+ @fldSort +' '+ @strFSortType
- end
- else
- begin
- set @strTmp=@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fldName+' from '+@tblName
- +' where '+@ID+' >(select max('+ @ID +') from ('+ @SqlSelect+' top '+ CAST(@pageSize*(@page-1) as Varchar(20)) +' '+ @ID +' from '+@tblName
- +' where (1=1) ' + @strCondition +' order by '+ @fldSort +' '+ @strFSortType+') AS TBMinID)'
- +' '+ @strCondition +' order by '+ @fldSort +' '+ @strFSortType
- end
- end
- else
- begin
- 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))+' '+ @fldName+' from '+@tblName
- +' where (1=1) '+ @strCondition +' order by '+ @fldSort +' '+ @strSortType+') AS TempTB'+' order by '+ @fldSort +' '+ @strFSortType
- else if(@Sort=1)
- set @strTmp=@SqlSelect+' * from ('+@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fldName+' from '+@tblName
- +' where '+@ID+' >(select max('+ @ID +') from('+ @SqlSelect+' top '+ CAST(@pageSize*(@page-2)+@lastcount as Varchar(20)) +' '+ @ID +' from '+@tblName
- +' where (1=1) '+ @strCondition +' order by '+ @fldSort +' '+ @strSortType+') AS TBMaxID)'
- +' '+ @strCondition+' order by '+ @fldSort +' '+ @strSortType+') AS TempTB'+' order by '+ @fldSort +' '+ @strFSortType
- else
- set @strTmp=@SqlSelect+' * from ('+@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(4))+' '+ @fldName+' from '+@tblName
- +' where '+@ID+' <(select min('+ @ID +') from('+ @SqlSelect+' top '+ CAST(@pageSize*(@page-2)+@lastcount as Varchar(20)) +' '+ @ID +' from '+@tblName
- +' where (1=1) '+ @strCondition +' order by '+ @fldSort +' '+ @strSortType+') AS TBMaxID)'
- +' '+ @strCondition+' order by '+ @fldSort +' '+ @strSortType+') AS TempTB'+' order by '+ @fldSort +' '+ @strFSortType
- end
- end
- ------返回查询结果-----
- exec sp_executesql @strTmp
- select datediff(ms,@timediff,getdate()) as 耗时
- --print @strTmp
- SET NOCOUNT OFF
- GO
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