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String hql = "from People people left join People.childs childs on childs.cid = people.cid"
<class>
....
<set name="children" inverse="true" >
<key column="parent_Id" />
<one-to-many class="Parent" />
<filter name="typefilter" />
</set>
</class>
<filter-def name="typefilter" condition="type=:type" >
<filter-param name="type" type="string" />
</filter-def>
session.enableFilter("typefilter").setParameter("type","xxxxxxxx");
List list=session.createQuery("select p from Parent p left join p.children c").list();