many-to-many生成中间表

<!-- 岗位列表 --><set name="station" inverse="true" cascade="all,delete-orphan" table="T_USER_STATION" fetch="join"><key column="I_USER_ID" /><many-to-many /></many-to-many></set>

<!-- 用户列表 --><set name="user" inverse="true" cascade="all,delete-orphan" table="T_USER_STATION" fetch="join"><key column="I_STATION_ID" /><many-to-many /></many-to-many></set>