Fill JPA仅用特定的子数组填充子数组(一对多)

@Entity
public class Department {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    private String name;

    @OneToMany(cascade = CascadeType.ALL, orphanRemoval = true)
    @JoinColumn(name = "department_id")
    private List<Employee> employees = new ArrayList<>();

    // getters and setters
}

@Entity
public class Employee {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    private String name;

    // getters and setters
}

// 在服务层或DAO层
public void updateDepartmentEmployees(Long departmentId, List<Employee> newEmployees) {
    Department department = entityManager.find(Department.class, departmentId);
    if (department != null) {
        // 清除现有的员工列表
        department.getEmployees().clear();
        // 添加新的员工列表
        department.getEmployees().addAll(newEmployees);
        // 持久化更改
        entityManager.merge(department);
    }
}