在Hibernate中配置多对多连接表

接前文在Hibernate中配置一对多连接表

其中表roomusers更改如下：

create table ROOMUSERS(
       USERID NUMBER(4),
       ROOMID NUMBER(4) not null
);

映射文件配置如下：
Room.hbm.xml

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- 
    Mapping file autogenerated by MyEclipse Persistence Tools
-->
<hibernate-mapping package="com.cosmow.hibernatedemo2.entity">
    <class name="Room" table="ROOM" schema="STORE">
        <id name="id" type="java.lang.Long">
            <column name="ID" precision="4" scale="0" />
            <!-- Oracle数据库增长方式序列 -->
            <generator class="sequence">
                <param name="sequence">ROOM_SEQ</param>
            </generator>
        </id>
        <!-- 映射roomnumber属性 -->
        <property name="roomnumber" type="java.lang.String">
            <column name="ROOMNUMBER" length="11" not-null="true" />
        </property>
        <!-- 映射name属性 -->
        <property name="name" type="java.lang.String">
            <column name="NAME" length="32" not-null="true" />
        </property>
        <!-- 通过连接表的多端，因此需要table属性为roomusers -->
        <set name="users" cascade="all" table="roomusers">
            <!-- 该key的字段为连接表中的字段，作为外键 -->
            <key column="roomid" />
            <!-- 配置多对多 -->
            <many-to-many class="Userinfo" column="userid" />
        </set>
    </class>
</hibernate-mapping>

Userinfo.hbm.xml

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- 
    Mapping file autogenerated by MyEclipse Persistence Tools
-->
<hibernate-mapping package="com.cosmow.hibernatedemo2.entity">
    <class name="Userinfo" table="USERINFO" schema="STORE">
        <id name="id" type="java.lang.Long">
            <column name="ID" precision="4" scale="0" />
            <!-- Oracle数据库增长方式序列 -->
            <generator class="sequence">
                <param name="sequence">USERINFO_SEQ</param>
            </generator>
        </id>
        <property name="name" type="java.lang.String">
            <column name="NAME" length="32" not-null="true" />
        </property>
        <property name="sex" type="java.lang.String">
            <column name="SEX" length="2" />
        </property>
        <set name="rooms" cascade="all" table="roomusers">
            <key column="userid" />
            <many-to-many class="Room" column="roomid" />
        </set>
    </class>
</hibernate-mapping>

测试代码如下：