java - 具有多个关联的 Hibernate 提取

Question

我这样做是为了延迟加载实体对象上的集合:

@Transactional(readOnly = true)
public T getWithAssociation(final long id, String association) {
    Session session = sessionFactory.getCurrentSession();
    final Criteria crit = session.createCriteria(genericType);
    crit.setFetchMode(association, FetchMode.JOIN);
    crit.add(Property.forName("id").eq(id));
    return (T) crit.uniqueResult();
}

我想返回一个具有多个延迟加载集合的实体对象加载，我可以这样做吗(传入一个列表并为单个条件设置多个关联？):

   @Transactional(readOnly = true)
    public T getWithAssociations(final long id, List<String> associations) {
        Session session = sessionFactory.getCurrentSession();
        final Criteria crit = session.createCriteria(genericType);
        for(String association:associations) {
            crit.setFetchMode(association, FetchMode.JOIN);
        }
        crit.add(Property.forName("id").eq(id));
        return (T) crit.uniqueResult();
    }

Answer 1

是吗？

docs包含以下内容:

List cats = sess.createCriteria(Cat.class)
    .add( Restrictions.like("name", "Fritz%") )
    .setFetchMode("mate", FetchMode.EAGER)
    .setFetchMode("kittens", FetchMode.EAGER)
    .list();

This query will fetch both mate and kittens by outer join. See Section 20.1, “Fetching strategies” for more information.