• 高效的二分法TOP MAX/TOP MIN分页存贮过程


    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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  • 原文地址:https://www.cnblogs.com/Leo_wl/p/1774220.html
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