Add support for items as query parameters

[Nicklas Nordborg]

Eg. instead of

select s from SampleData s where s.id = :id

it would be possible to do

select s from SampleData s where s = :entity

and then in the code

query.setParameter("id", sample.getId());

can be replaced with

query.setParameter("entity", sample);

If we try the latter in the current version an exception is thrown:

java.lang.IllegalArgumentException: java.lang.ClassCastException@78ff22ed
	at sun.reflect.GeneratedMethodAccessor48.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.hibernate.property.BasicPropertyAccessor$BasicGetter.get(BasicPropertyAccessor.java:172)
	at org.hibernate.tuple.entity.AbstractEntityTuplizer.getIdentifier(AbstractEntityTuplizer.java:227)
	at org.hibernate.persister.entity.AbstractEntityPersister.getIdentifier(AbstractEntityPersister.java:3850)
	at org.hibernate.persister.entity.AbstractEntityPersister.isTransient(AbstractEntityPersister.java:3558)
	at org.hibernate.engine.ForeignKeys.isTransient(ForeignKeys.java:203)
	at org.hibernate.engine.ForeignKeys.getEntityIdentifierIfNotUnsaved(ForeignKeys.java:242)
	at org.hibernate.type.ManyToOneType.disassemble(ManyToOneType.java:203)
	at org.hibernate.cache.QueryKey.generateQueryKey(QueryKey.java:107)
	at org.hibernate.loader.Loader.listUsingQueryCache(Loader.java:2291)
	at org.hibernate.loader.Loader.list(Loader.java:2268)
	at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:452)
	at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:363)
	at org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:196)
	at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1268)
	at org.hibernate.impl.QueryImpl.list(QueryImpl.java:102)
	at net.sf.basedb.core.hibernate.QueryWrapper.list(QueryWrapper.java:109)
	at net.sf.basedb.core.HibernateUtil.loadData(HibernateUtil.java:1462)
	at net.sf.basedb.core.AbstractHqlQuery.count(AbstractHqlQuery.java:165)
	at net.sf.basedb.core.AbstractEntityQuery.count(AbstractEntityQuery.java:234)
	at net.sf.basedb.core.ItemQuery.count(ItemQuery.java:40)

[Nicklas Nordborg]

(In [5564]) Fixes #1578: Add support for items as query parameters