SQL海量分页存储过程

Create proc xp_Pager
@tableName varchar(20),
@pageSize int,
@pageIndex int,
@primaryKey varchar(20),
@strWhere varchar(500)
as
 declare @sqlStr varchar(2000)
 if(@strWhere!='')
 begin
 set @sqlStr='select top '+cast(@pageSize as varchar(10))
     +' * from '+@tableName
     +' where '+@primaryKey
     +' not in (select top '+cast((@pageSize*(@pageIndex-1)) as varchar(10))+' '+@primaryKey
     +' from '+@tableName
     +' where '+@strWhere+' order by '+@primaryKey

     +') and '+@strWhere+' order by '+@primaryKey
 end
 else
 begin
 set @sqlStr='select top '+cast(@pageSize as varchar(10))
     +' * from '+@tableName
     +' where '+@primaryKey
     +' not in (select top '+cast((@pageSize*(@pageIndex-1)) as varchar(10))+' '+@primaryKey
     +' from '+@tableName
     +' order by '+@primaryKey
     +')  order by '+@primaryKey
 end
 exec(@sqlStr)