【iBatis】使用resultMap配置返回结果时报错“列名无效”

使用iBatis联查DEPT、EMP两张表时

采用如下结构

<resultMap id="find_departmentMap" class="com.dto.DepartmentDTO">
　　<result property="deptNO" column='deptNO'/>
　　<result property="dName" column='dName'/>
　　<result property="loc" column='loc'/>
　　<result property="employeeList" column='{deptNO=depNO}' select="comSqlMap.findEmployee" />
</resultMap>

<select id="findDepartment" parameterClass="java.util.HashMap" resultClass="find_departmentMap">
SELECT DEPTNO, DNAME, LOC
FROM DEPT
WHERE DEPTNO = #deptNO#
AND DNAME = #dName#
</select>

<select id="findEmployee" parameterClass="java.lang.String" resultClass="com.dto.EmployeeDTO">
SELECT EMPNO, ENAME, JOB,
    MGR, HIREDATE, SAL,
    COMM, DEPTNO
FROM EMP
WHERE DEPTNO = #deptNO#
</select>

程序报错：“employeeList" 列名无效

处理方法：把“findEmployee”的select的parameterClass属性值改为java.util.HashMap，如下所示

<select id="findEmployee" parameterClass="java.util.HashMap" resultClass="com.dto.EmployeeDTO">
SELECT EMPNO, ENAME, JOB,
    MGR, HIREDATE, SAL,
    COMM, DEPTNO
FROM EMP
WHERE DEPTNO = #deptNO#
</select>