[jboss-user] [Persistence, JBoss/CMP, Hibernate, Database] - Are object references shared?
If I use JBoss, EJB3.0, JPA, Hibernate to do a query:
Query q = em.createQuery("SELECT c FROM City c WHERE
c.country.id=?").setParameter(1,myCountry.id);
| List cities = q.getList();
|
will the following be true? cities.get(i).country == myCountry
...ie, are object references shared, or will each city have it's own instance of
Country such that (only) cities.get(i).country.equals(myCountry)
The second part of my question is along the same lines. If different users load objects
using similar queries, perhaps:
"SELECT c FROM City c WHERE c.country.id IN(?,?,?)" are new instances created
for entities which have recently been loaded by another user? Would the following return
true?
for each ( aCity in userA.cities ) {
| for each ( bCity in userB.cities ) {
| if( aCity == bCity ) {
| // share same object, not just copies of same records
| return true;
| }
| }
| }
| return false;
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