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高效分页方法代码(sql百万级数据量分页代码)

高效分页方法代码(sql百万级数据量分页代码)

@querystr nvarchar(300),--表名、视图名、查询语句@pagesize int=10,--每页的大小(行数)@pagecurrent int=1,--要显示的页@fdshow nvarchar (100)='',--要显示的字段列表,如果查询结果有标识字段,需要指

定此值,且不包含标识字段@fdorder nvarchar (100)='',--排序字段列表@wherestr nvarchar (200)='', --内容是' id=3 and model_no like '%24%'

and '@rscount int=0 output asset @fdshow=' '+@fdshow+' 'set @fdorder= ' '+@fdorder+' 'set @wherestr= ' '+@wherestr+' '

declare @fdname nvarchar(250)--表中的主键或表、临时表中的标识列名,@id1 varchar(20),@id2 varchar(20)--开始和结束的记录号,@obj_id int --对象id,@temp nvarchar(300) --临时语句,@strparam nvarchar(100) --临时参数

declare @strfd nvarchar(2000)--复合主键列表,@strjoin nvarchar(4000)--连接字段,@strwhere nvarchar(2000)--查询条件--检查输入参数set @querystr=ltrim(rtrim(@querystr))select @obj_id=object_id(@querystr),@fdshow=case isnull(@fdshow,'') when '' then ' *' else ' '+@fdshow end,@fdorder=case isnull(@fdorder,'') when '' then '' else ' order by

'+@fdorder end,@querystr=case when @obj_id is not null then ' '+@querystr else '

('+@querystr+') a' end--输出总记录数set @temp= 'select @rscount=count(*) from ' + @querystr+' '+@wherestrset @strparam = n'@rscount int out'execute sp_executesql @temp,@strparam,@rscount out--如果显示第一页,可以直接用top来完成if @pagecurrent=1beginselect @id1=cast(@pagesize as varchar(20))exec('select top '+@id1+@fdshow+' from '+@querystr+@wherestr+@fdorder)returnend--如果是表,则检查表中是否有标识更或主键if @obj_id is not null and objectproperty(@obj_id,'istable')=1beginselect @id1=cast(@pagesize as varchar(20)),@id2=cast((@pagecurrent-1)*@pagesize as varchar(20))select @fdname=name from syscolumns where id=@obj_id and status=0x80if @@rowcount=0--如果表中无标识列,则检查表中是否有主键beginif not exists(select 1 from sysobjects where parent_obj=@obj_id and

xtype='pk')goto lbusetemp--如果表中无主键,则用临时表处理select @fdname=name from syscolumns where id=@obj_id and colid in(select colid from sysindexkeys where @obj_id=id and indid in(select indid from sysindexes where @obj_id=id and name in(select name from sysobjects where xtype='pk' and parent_obj=@obj_id)))

if @@rowcount1--检查表中的主键是否为复合主键beginselect @strfd='',@strjoin='',@strwhere=''select @strfd=@strfd+',['+name+']',@strjoin=@strjoin+' and a.['+name+']=b.['+name+']',@strwhere=@strwhere+' and b.['+name+'] is null'from syscolumns where id=@obj_id and colid in(select colid from sysindexkeys where @obj_id=id and indid in(select indid from sysindexes where @obj_id=id and name in(select name from sysobjects where xtype='pk' and parent_obj=@obj_id)))select @strfd=substring(@strfd,2,2000),@strjoin=substring(@strjoin,5,4000),@strwhere=substring(@strwhere,5,4000)goto lbusepkendendendelsegoto lbusetemp/*--使用标识列或主键为单一字段的处理方法--*/lbuseidentity: if len(@wherestr)10beginexec('select top '+@id1+@fdshow+' from '+@querystr+@wherestr+' and '+@fdname+' not in(select top '+@id2+' '+@fdname+' from '+@querystr+@wherestr+@fdorder+')'+@fdorder)returnendelsebeginexec('select top '+@id1+@fdshow+' from '+@querystr+' where '+@fdname+' not in(select top '+@id2+' '+@fdname+' from '+@querystr+@fdorder+')'+@fdorder)returnend/*--表中有复合主键的处理方法--*/lbusepk:exec('select '+@fdshow+' from(select top '+@id1+' a.* from(select top 100 percent * from '+@querystr+@fdorder+') aleft join (select top '+@id2+' '+@strfd+' from '+@querystr+@fdorder+') b on '+@strjoin+'where '+@strwhere+') a')return/*--用临时表处理的方法--*/lbusetemp:select @fdname='[id_'+cast(newid() as varchar(40))+']',@id1=cast(@pagesize*(@pagecurrent-1) as varchar(20)),@id2=cast(@pagesize*@pagecurrent-1 as varchar(20))exec('select '+@fdname+'=identity(int,0,1),'+@fdshow+'into #tb from'+@querystr+@fdorder+'select '+@fdshow+' from #tb where '+@fdname+' between '+@id1+' and '+@id2)

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