I have a simple model which is just a chain of one-to-many relationships: Country -< City -< Street
The tables are mapped as entities and are returned as Map<String, Object>.
The following test method is producing odd results:
Code:
public static void main(String[] args) {
Session session = HibernateSessionFactory.getSession();
List<Map<String, Object>> results = null;
//Query using HQL and print results
System.out.println("FROM HQL =====================");
String hql = "from Street where City.Country.countryid = 1";
Query query = session.createQuery(hql);
results = query.list();
for(Map<String, Object> row : results) {
System.out.println(row);
}
//Query using Criteria and print results
System.out.println("FROM CRITERIA ================");
Criteria criteria = session.createCriteria("Street");
criteria.add(Restrictions.eq("City.Country.countryid", 1));
results = criteria.list();
for(Map<String, Object> row : results) {
System.out.println(row);
}
}
The top block which uses the HQL works as expected, but the bottom block falls over:
Output:
Code:
FROM HQL =====================
{streetname=Mayfair, City=org.hibernate.proxy.map.MapProxy@2b12e7f7, $type$=Street, streetid=1}
{streetname=Park Lane, City=org.hibernate.proxy.map.MapProxy@2b12e7f7, $type$=Street, streetid=2}
{streetname=Bond Street, City=org.hibernate.proxy.map.MapProxy@663b1f38, $type$=Street, streetid=3}
{streetname=Old Kent Road, City=org.hibernate.proxy.map.MapProxy@663b1f38, $type$=Street, streetid=4}
FROM CRITERIA ================
Exception in thread "main" org.hibernate.QueryException: could not resolve property: City.Country.countryid of: Street
at org.hibernate.persister.entity.AbstractPropertyMapping.propertyException(AbstractPropertyMapping.java:67)
at org.hibernate.persister.entity.AbstractPropertyMapping.toColumns(AbstractPropertyMapping.java:82)
at org.hibernate.persister.entity.BasicEntityPropertyMapping.toColumns(BasicEntityPropertyMapping.java:54)
at org.hibernate.persister.entity.AbstractEntityPersister.toColumns(AbstractEntityPersister.java:1367)
at org.hibernate.loader.criteria.CriteriaQueryTranslator.getColumns(CriteriaQueryTranslator.java:457)
at org.hibernate.loader.criteria.CriteriaQueryTranslator.getColumnsUsingProjection(CriteriaQueryTranslator.java:417)
at org.hibernate.criterion.SimpleExpression.toSqlString(SimpleExpression.java:68)
at org.hibernate.loader.criteria.CriteriaQueryTranslator.getWhereCondition(CriteriaQueryTranslator.java:357)
at org.hibernate.loader.criteria.CriteriaJoinWalker.<init>(CriteriaJoinWalker.java:113)
at org.hibernate.loader.criteria.CriteriaJoinWalker.<init>(CriteriaJoinWalker.java:82)
at org.hibernate.loader.criteria.CriteriaLoader.<init>(CriteriaLoader.java:91)
at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1578)
at org.hibernate.impl.CriteriaImpl.list(CriteriaImpl.java:306)
at com.bar.foo(Main.java:33)
I can't see why the HQL can resolve City.Country.countryid but Criteria (Restrictions) can't.
Am I missing something obvious?
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