Hibernate关联表查询

Question

重贴代码:
public class Item{
....private int id;
....private Set categories;
}public class Category{
....private int id;
}<hibernate-mapping default-lazy="false">
....<class name="Item" table="Item">
........<id name="id" column="id">
............<generator class="native" />
........</id>
........<set name="categories" table="ItemCategory">
............<key column="itemId" />
............<many-to-many class="Category" column="categoryId" />
........</set>
....</class>
....<class name="Category" table="Category">
........<id name="id" column="id">
............<generator class="native" />
........</id>
....</class>
</hibernate-mapping>