MyBatis insert实体如何返回主键

<insert id="add" parameterType="com.test.model.Course">
  <foreach collection="list" item="item" index="index" separator=";"> 
insert into tb_course (course_name, teacher_name,
  course_week, course_time, place, 
  gmt_create, gmt_modify)
values (#{courseName,jdbcType=VARCHAR}, #{teacherName,jdbcType=VARCHAR},
  #{courseWeek,jdbcType=VARCHAR}, #{courseTime,jdbcType=VARCHAR}, #{place,jdbcType=VARCHAR}, 
  #{gmtCreate,jdbcType=TIMESTAMP}, #{gmtModify,jdbcType=TIMESTAMP})
 </foreach></insert>

<selectKey resultType="java.lang.Short" order="AFTER" keyProperty="id">
SELECT LAST_INSERT_ID() AS id
</selectKey>

public class Role implements Serializable {
    private String roleId;
    private String name;
    private Integer status;
 public String getRoleId() {
  return roleId;
 }
 public void setRoleId(String roleId) {
  this.roleId = roleId;
 }
 public String getName() {
  return name;
 }
 public void setName(String name) {
  this.name = name;
 }
 public Integer getStatus() {
  return status;
 }
 public void setStatus(Integer status) {
  this.status = status;
 }
}

public interface SysRoleDao {
 public int addRole(SysRole role);
}

<insert id="addRole" parameterType="SysRole" useGeneratedKeys="true" keyProperty="roleId" keyColumn="role_id">
 insert into t_sys_role(
  name,status
 )
 values(
         #{name,jdbcType=VARCHAR},
  #{status,jdbcType=VARCHAR},
 )
</insert>

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations= {"classpath:config/spring-core.xml","classpath:config/spring-web.xml"})
public class TestDao{
 @Autowired
 SysRoleDao roleDao;
 @Test
 public void test() {
  SysRole role=new SysRole();
  role.setName("admin10");
  role.setStatus(1);
  System.out.println("返回结果:"+roleDao.addRole(role));
  System.out.println("主键id:"+role.getRoleId());
 }
}