Hibernate关联表查询

[ideawu]

Hibernate 关联表查询

public class Item{
private int id;
private Set categories;
}

public class Category{
private int id;
}

这两个实体通过一个没有主键的关联表进行连接.

<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>

因为Category下会有很多Item, 所以不可能在Category中设置Item的集合. 如果想要查编号为1的目录下的所有Item, 请问如何查询?

谢谢!

[ideawu]

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>

[jingtao8177]

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