Not able to migrate a query with not exist clause

Question

Hi all,
I'm using Toplink 10.1.3 and I am trying to rewrite the following query with Expression Framework:
select distinct r.e_ogg_oper_k_oggetto
FROM regola_accettazione_oper_banc r, oggetto_operazione_bancaria o
where not exists (
select 1
FROM limitaz_ogg_tipo_oper_banc l
where nvl(l.d_fine_validita,trunc(sysdate)+1)>trunc(sysdate)
and l.d_inizio_validita <= trunc(sysdate)
and l.e_tpodv_k_tipo_operazione=:appoggio.tipo_operaz
and l.e_ogg_oper_k_oggetto=r.e_ogg_oper_k_oggetto
and l.e_uni_oper_k_unita_oper_util= :appoggio.e_uni_oper_k_unita_oper_esegui )
and r.e_oper_ban_k_operaz_bancaria=:appoggio.form
and r.e_ogg_oper_k_oggetto=o.k_oggetto
and o.e_ogg_oper_k_oggetto is null
and o.k_oggetto != nvl(:appoggio.oggetto_autom,,'0')
and o.k_oggetto like substr(:appoggio.oggetto,1,2)||'%'
and r.d_inizio_validita <= :appoggio.d_contab
and to_date(nvl(to_char(r.d_fine_validita,DD/MM/YYYY'),31/12/3999'),'DD/MM/YYYY')> :appoggio.d_contab
and o.f_natura_oggetto in ('G','P') and r.f_oggetto_automatizzato!='S'
I'm not able to "attach" the not exist clause to the rest of query.
How can I do it?
Thank you very much.

Answer 1

Not exists can be used in an expression through using a ReportQuery sub-query.
i.e.
ExpressionBuilder outerBuilder = new ExpressionBuilder();
ReadAllQuery outerQuery = new ReadAllQuery(Employee.class, outerBuilder);
ExpressionBuilder subBuilder = new ExpressionBuilder();
ReportQuery subQuery = new ReportQuery(Address.class, subBuilder);
subQuery.addAttribute("id");
subQuery.setSelectionCriteria(
subBuilder.get("city").equal(outerBuilder.get("address").get("city")
.and(subBuilder.notEqual(outerBuilder.get("address")))));
outerQuery.setSelectionCriteria(
outerBuilder.notExists(subQuery));
List results = (List) session.executeQuery(outerQuery);
Refer to the documentation section on sub-queries for more information.
I would suggest simlpifying the where clause until you get the sub-query working to start.
You can also always use a custom SQL query in TopLink.