Server side paging hughe tables.

Question

Hi,
If I want to do a findAll () on a serious big table (million records), I need a paging mechanism, to avoid an out of memory exception.
This table has a primary key consisting of one (String) field, so no complex stuff there. Is there any easy way to do this with ejbql? I'm using weblogic 6 as the application server.
Cheers.

Answer 1

forget about ejbql...
ejbql is not good solution for big table
use fast lane pattern, and directly access database.
This is oracle example.
oracle hint and inline view and good index is key point.
       String query= "select "+REQUEST_LIST_SELECT+" from "+TABLE_SERVICE_REQUEST +","+
                " (select /*+ INDEX_DESC("+TABLE_SERVICE_REQUEST+" "+INDEX_SERVICE_REQUEST+")*/ "+
                "  ROWNUM NUM,SERVICE_CODE from "+TABLE_SERVICE_REQUEST+
                " where ROWNUM<="+(offset+numberPerPage)+
                    getServiceRequestWhere(searchStart,searchEnd,keyward)+
                " ) indexer "+
                " where NUM>"+offset+" and indexer.SERVICE_CODE="+TABLE_SERVICE_REQUEST+".SERVICE_CODE "+
                " order by SERVICE_CODE desc";