MSSQL分页：一个高效的二分法TOP MAX/TOP MIN分页存贮过程

--/*-----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 -------*/
--/*-----存储过程 分页处理 孙伟 2005-04-21修改 添加Distinct查询功能-------*/
--/*-----存储过程 分页处理 孙伟 2005-05-18修改 多字段排序规则问题-------*/
--/*-----存储过程 分页处理 孙伟 2005-06-15修改 多字段排序修改-------*/
--/*-----存储过程 分页处理 孙伟 2005-12-13修改 修改数据分页方式为top max模式 性能有极大提高-------*/
--/*-----缺点：相对之前的not in版本主键只能是整型字段,如主键为GUID类型请使用not in 模式的版本-------*/

CREATE PROCEDURE [dbo].[getPagerTopMAX] (
    @tblName     nvarchar(2000),           ----要显示的表或多个表的连接,如："myTable"
    @ID        nvarchar(150),            ----主表的主键，如："id"
    @page        int = 1,                ----要显示那一页的记录
    @pageSize    int = 10,                ----每页显示的记录个数
    @fldName     nvarchar(500) = '*',        ----要显示的字段列表,如："id, cdsinger, cdsingertype, area, cdsingerreadme"
    @fldSort    nvarchar(200) = @ID,       ----排序字段列表或条件
    @Sort        bit = 1,                ----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,如："and a=1 and b=2"
    @Dist                 bit = 0,          ----是否添加查询字段的 DISTINCT 默认0不添加/1添加
    @Counts    int = 1 output,              ----查询到的记录数
    @pageCount    int = 1 output            ----查询结果分页后的总页数
) AS begin
    SET NOCOUNT ON
    Declare @sqlTmp nvarchar(3000)           ----存放动态生成的SQL语句
    Declare @strTmp nvarchar(3000)            ----存放取得查询结果总数的查询语句
    Declare @strID     nvarchar(3000)       ----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


    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(20))+' '+ @fldName+' from '+@tblName                        
                            +' order by '+ @fldSort +' '+ @strFSortType
                    else
                    begin                    
                        set @strTmp=@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(20))+' '+ @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    
                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(20))+' '+ @fldName+' from '+@tblName
                            +' order by '+ @fldSort +' '+ @strSortType+') AS TempTB'+' order by '+ @fldSort +' '+ @strFSortType 
                    else
                        set @strTmp=@SqlSelect+' * from ('+@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(20))+' '+ @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
        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(20))+' '+ @fldName+' from '+@tblName                        
                            +' where 1=1 ' + @strCondition + ' order by '+ @fldSort +' '+ @strFSortType
                    else
                    begin                    
                        set @strTmp=@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(20))+' '+ @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            
            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(20))+' '+ @fldName+' from '+@tblName
                            +' where (1=1) '+ @strCondition +' order by '+ @fldSort +' '+ @strSortType+') AS TempTB'+' order by '+ @fldSort +' '+ @strFSortType                     
                else
                        set @strTmp=@SqlSelect+' * from ('+@SqlSelect+' top '+ CAST(@pageSize as VARCHAR(20))+' '+ @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                
            end    
        end

    ------返回查询结果-----
    --print @strTmp
    exec (@strTmp)


    SET NOCOUNT OFF

end