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MSSQL分页:一个高效的二分法TOP MAX/TOP MIN分页存贮过程

作者:佚名 出处:互联网 2010年07月06日 阅读:

MSSQL分页:一个高效的二分法TOP MAX/TOP MIN分页存贮过程

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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

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