我正在尝试使用休眠条件向 Join 子句添加附加条件。事实上,有一些方法可以做到这一点:
createCriteria(String associationPath, String alias, int joinType, Criterion withClause)
和
createAlias(String associationPath, String alias, int joinType, Criterion withClause)
它们在一对一和一对多的关系中正常工作。但是,当我尝试将它们与具有多对多关系的实体一起使用时,出现以下错误:
Caused by: org.postgresql.util.PSQLException: No value specified for parameter 1.
有谁能够帮我?粗鲁的例子如下:
@Entity
public class Person {
@Id
@GeneratedValue
private Long id;
@ManyToMany
private Set<PersonName> names;
}
public class PersonName {
@Id
@GeneratedValue
private Long id;
@Column
private String name;
}
public class PersonDao extends HibernateDaoSupport {
public List<Person> findByName() {
Criteria criteria = getSession().createCriteria(Person.class, "p");
criteria.createCriteria("p.names", "names", JoinType.INNER_JOIN, Restrictions.eq("name", "John"));
return criteria.list();
}
}
正在生成的查询是
select this_.id as y0_ from person this_
inner join debtor_info this_1_ on this_.id=this_1_.id
left outer join person_person_name personname3_ on this_.id=personname3_.person_id and ( name1_.name=? )
left outer join person_name name1_ on personname3_.person_name_id=name1_.id and ( name1_.name=? )
如您所见,加入条件被添加了两次,显然是不正确的
提前致谢。
顺便说一句,我正在使用 postgresql 9,Hibernate 3.6.3