mybatis分步查询与延迟加载

<resultMap id="rMap" type="com.yunqing.mybatis.bean.Department">
        <id column="id" property="id"/>
        <result column="department" property="departmentName"/>
    </resultMap>
    <select id="getDepByIdStep2" resultMap="rMap">
        SELECT id,department FROM t_dep WHERE id=#{id}
    </select>

<resultMap id="rMap" type="com.yunqing.mybatis.bean.User">
        <id column="id" property="id"/>
        <result column="name" property="name"/>
        <result column="age" property="age"/>
<!--depUser实体类中的Department dep;select中的内容是查询DepartmentMapper接口的getDepByStep2方法；dep_id是User数据库表字段名-->

        <association property="dep" select="com.yunqing.mybatis.dao.DepartmentMapper.getDepByIdStep2"
         column="dep_id">

        </association>
    </resultMap>
<select id="getUserByIdStep1" resultMap="rMap">
        SELECT * FROM t_user WHERE id=#{id}
    </select>

    <settings>
        <setting name="lazyLoadingEnabled" value="true"/>
        <setting name="aggressiveLazyLoading" value="false"/>
    </settings>