public Emp getEmpandDept();

 　<resultMap type="com.eu.bean.Emp" id="emp2">

       <id column="id" property="id"/>

       <result column="last_name" property="lastName"/>

       <result column="gender" property="geder"/>

       <result column="email" property="email"/>

       <result column="id" property="dept.id"/>

       <result column="dept_name" property="dept.deptName"/>

   </resultMap>

 　<select id="getEmpandDept" resultMap="emp2">

       SELECT *

       FROM emp e

     JOIN dept d

     ON e.d_id=d.id

   </select>