映射文件没贴全所以有好多段字段不知道是那个实体看不懂
贴下我以前的吧
Role.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>
<class name="hibernate.Role" table="role" schema="dbo" catalog="pubs">
<id name="roleId" type="java.lang.Integer">
<column name="roleID" />
<generator class="assigned"></generator>
</id>
<property name="roleName" type="java.lang.String">
<column name="roleName" length="20" />
</property>
<set name="powers" inverse="true" table="rolepower">
<key>
<column name="roleID" />
</key>
<many-to-many class="hibernate.Power" column="powerID"/>
</set>
</class>
</hibernate-mapping>
Power.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>
<class name="hibernate.Power" table="power" schema="dbo" catalog="pubs">
<id name="powerId" type="java.lang.Integer">
<column name="powerID" />
<generator class="assigned"></generator>
</id>
<property name="powerName" type="java.lang.String">
<column name="powerName" length="20" />
</property>
<set name="roles" inverse="false" table="rolepower">
<key>
<column name="powerID" />
</key>
<many-to-many class="hibernate.Role" column="roleID"/>
</set>
</class>
</hibernate-mapping>
贴下我以前的吧
Role.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>
<class name="hibernate.Role" table="role" schema="dbo" catalog="pubs">
<id name="roleId" type="java.lang.Integer">
<column name="roleID" />
<generator class="assigned"></generator>
</id>
<property name="roleName" type="java.lang.String">
<column name="roleName" length="20" />
</property>
<set name="powers" inverse="true" table="rolepower">
<key>
<column name="roleID" />
</key>
<many-to-many class="hibernate.Power" column="powerID"/>
</set>
</class>
</hibernate-mapping>
Power.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>
<class name="hibernate.Power" table="power" schema="dbo" catalog="pubs">
<id name="powerId" type="java.lang.Integer">
<column name="powerID" />
<generator class="assigned"></generator>
</id>
<property name="powerName" type="java.lang.String">
<column name="powerName" length="20" />
</property>
<set name="roles" inverse="false" table="rolepower">
<key>
<column name="powerID" />
</key>
<many-to-many class="hibernate.Role" column="roleID"/>
</set>
</class>
</hibernate-mapping>
否则不做关系维护,相关代码你可以看1楼的,inverse的原理如下:inverse属性默认是false的,就是说关系的两端都来维护关系。这个意思就是说,如有一个Student, Teacher和TeacherStudent表,Student和Teacher是多对多对多关系,这个关系由TeacherStudent这个表来表现。那么什么时候插入或删除TeacherStudent表中的记录来维护关系呢?在用hibernate时,我们不会显示的对TeacherStudent表做操作。对TeacherStudent的操作是hibernate帮我们做的。hibernate就是看hbm文件中指定的是"谁"维护关系,那个在插入或删除"谁"时,就会处发对关系表的操作。前提是"谁"这个对象已经知道这个关系了,就是说关系另一头的对象已经set或是add到"谁"这个对象里来了。前面说过inverse默认是false,就是关系的两端都维护关系,对其中任一个操作都会处发对表系表的操作。当在关系的一头,如Student中的bag或set中用了inverse="true"时,那就代表关系是由另一关维护的(Teacher)。就是说当这插入Student时,不会操作TeacherStudent表,即使Student已经知道了关系。只有当Teacher插入或删除时才会处发对关系表的操作。所以,当关系的两头都用inverse="true"是不对的,就会导致任何操作都不处发对关系表的操作。当两端都是inverse="false"或是default值是,在代码对关系显示的维护也是不对的,会导致在关系表中插入两次关系。