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                # 15.4\. 關聯 你可以使用`createCriteria()`非常容易的在互相關聯的實體間建立 約束。 ``` List cats = sess.createCriteria(Cat.class) .add( Restrictions.like("name", "F%") ) .createCriteria("kittens") .add( Restrictions.like("name", "F%") ) .list(); ``` 注意第二個 `createCriteria()`返回一個新的 `Criteria`實例,該實例引用`kittens` 集合中的元素。 接下來,替換形態在某些情況下也是很有用的。 ``` List cats = sess.createCriteria(Cat.class) .createAlias("kittens", "kt") .createAlias("mate", "mt") .add( Restrictions.eqProperty("kt.name", "mt.name") ) .list(); ``` (`createAlias()`并不創建一個新的 `Criteria`實例。) `Cat`實例所保存的之前兩次查詢所返回的kittens集合是 _沒有_被條件預過濾的。如果你希望只獲得符合條件的kittens, 你必須使用`ResultTransformer`。 ``` List cats = sess.createCriteria(Cat.class) .createCriteria("kittens", "kt") .add( Restrictions.eq("name", "F%") ) .setResultTransformer(Criteria.ALIAS_TO_ENTITY_MAP) .list(); Iterator iter = cats.iterator(); while ( iter.hasNext() ) { Map map = (Map) iter.next(); Cat cat = (Cat) map.get(Criteria.ROOT_ALIAS); Cat kitten = (Cat) map.get("kt"); } ```
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