I am new with this. Please help me.
My inner join looks like this:
select p.idprodus, p.denumire, p.cantitate from Produs p inner join Furnizor f
on p.idfurn = f.idfurn
I want to make the inner join on the column idfurn, but I get these errors:
org.hibernate.QueryException: outer or full join must be followed by path expression select p.idprodus, p.denumire, p.cantitate from sakila.entity.Produs p inner join Furnizor f
on p.idfurn = f.idfurn
at org.hibernate.hql.classic.FromParser.token(FromParser.java:170)
at org.hibernate.hql.classic.ClauseParser.token(ClauseParser.java:86)
at org.hibernate.hql.classic.PreprocessingParser.token(PreprocessingParser.java:108)
at org.hibernate.hql.classic.ParserHelper.parse(ParserHelper.java:28)
at org.hibernate.hql.classic.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:216)
at org.hibernate.hql.classic.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:185)
at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:77)
at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:56)
at org.hibernate.engine.query.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:72)
at org.hibernate.impl.AbstractSessionImpl.getHQLQueryPlan(AbstractSessionImpl.java:133)
at org.hibernate.impl.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:112)
at org.hibernate.impl.SessionImpl.createQuery(SessionImpl.java:1623)
In HQL, you use entities, not tables. And entities are linked together by associations (OneToOne, OneToMany, etc.) Joins can anly be done between associated entities.
For example, if you have a ManyToOne association between Product and Provider, the HQL query is:
select p from Product p inner join p.provider provider where ...
The on clause is unnecessary, because Hibernate knows from the mapping of the ManyToOne association that a Product is associated with its provider using the product.id_provider foreign key to the provider.id_provider primary key.
All of this is very well explained, with lots of examples, in the Hibernate documentation.
If an association (e.g. OneToMany mapping) does not exist and you need an inner join then use the old cross join notation.
来源：https://stackoverflow.com/questions/10216426/i-cant-make-a-inner-join-between-two-tables-in-hibernate-hql-query