MyBatis（10）使用association进行分步查询

public Emp getEmpByStep(Integer id);

public Dept getDeptById(Integer id);

 1 　　<!-- 使用association进行分步查询 -->
 2   <resultMap type="com.eu.bean.Emp" id="MyStep">
 3       <id column="id" property="id"/>
 4       <result column="last_name" property="lastName"/>
 5       <result column="gender" property="geder"/>
 6       <result column="email" property="email"/>
 7       <association property="dept" 
 8       select="com.eu.dao.DeptDao.getDeptById"
 9       column="d_id">
10       </association>
11   </resultMap>
12 　<select id="getEmpByStep" resultMap="MyStep">
13       select * from emp where id = #{id}
14   </select>