如何从通过MyBatis映射器方法调用的PostgreSQL函数获取服务器消息(提出通知)？

public interface MyMapper {
    void callPostgreSQLFunction();
}

<mapper namespace="com.example.MyMapper">
    <select id="callPostgreSQLFunction" statementType="CALLABLE">
        SELECT my_function() AS message;
    </select>
</mapper>

SqlSessionFactory sqlSessionFactory = ... ;// 创建SqlSessionFactory
SqlSession sqlSession = sqlSessionFactory.openSession();
try {
    MyMapper myMapper = sqlSession.getMapper(MyMapper.class);
    myMapper.callPostgreSQLFunction();
    // 执行其他操作...
    sqlSession.commit();
} finally {
    sqlSession.close();
}