mybatis映射内部类的使用及注意事项说明

@Data
public class DeptVo {
    /**部门id*/
    private Long deptId;
    /**部门名称*/
    private String deptName;
    /**部门员工(一对多)*/
    private List<EmployeeVo> employeeVoList;
}

@Data
public class EmployeeVo {
    private String employeeId;
    private String employeeName;
    private String employeeIntro;
    private Integer employeeAge;
}

<resultMap id="deptMap" type="com.cxk.demo1.pojo.DeptVo">
        <result column="deptId" property="deptId" />
        <result column="deptName" property="deptName" />
        <collection property="employeeVoList" ofType="com.cxk.demo1.pojo.EmployeeVo">
            <result column="employeeId" property="employeeId" />
            <result column="employeeName" property="employeeName" />
            <result column="employeeIntro" property="employeeIntro" />
            <result column="employeeAge" property="employeeAge" />
        </collection>
    </resultMap>

    <select id="listDeptWithEmployee" resultMap="deptMap">
        select
            d.id        deptId,
            d.name      deptName,
            e.id        employeeId,
            e.name      employeeName,
            e.intro     employeeIntro,
            e.age       employeeAge
        from t_dept d
        LEFT JOIN t_employee e on d.id = e.dept_id
        order BY d.name
    </select>

	@Override
    public List<DeptVo> getDept() {
        return deptMapper.listDeptWithEmployee();
    }

@Data
public class DeptVo {

    /**部门id*/
    private Long deptId;
    /**部门名称*/
    private String deptName;
    /**部门员工(一对多)*/
    private List<EmployeeVo> employeeVoList;

    @Data
    static class EmployeeVo{
        private String employeeId;
        private String employeeName;
        private String employeeIntro;
        private Integer employeeAge;
    }
}