Hibernate Join Query无效

Question

我必须表即员工和部门 在部门表

CREATE TABLE `department` (
`department_id` BIGINT(20) NOT NULL AUTO_INCREMENT,
`dept_name` VARCHAR(50) NOT NULL DEFAULT '0',
PRIMARY KEY (`department_id`));

在Emplyee表中

CREATE TABLE `employee` (
`employee_id` BIGINT(10) NOT NULL AUTO_INCREMENT,
`firstname` VARCHAR(50) NULL DEFAULT NULL,
`lastname` VARCHAR(50) NULL DEFAULT NULL,
`birth_date` DATE NULL DEFAULT NULL,
`department_id` BIGINT(20) NULL DEFAULT NULL,
PRIMARY KEY (`employee_id`),
INDEX `FK_DEPT` (`department_id`),
CONSTRAINT `FK_DEPT` FOREIGN KEY (`department_id`) REFERENCES `department` (`department_id`));

我想显示员工的名字，姓氏和部门名称 那么如何在hibernate中编写查询请帮助