高效分页方法代码

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 '$%'

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)*唯一官网,@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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