在java中更新play framework 2.5中的记录

Question

我是Play框架的新手。我一直在使用play framework 2.5编写java中的基本创建，查找，删除和更新Employee记录。我在更新记录时遇到问题。这是我在Controller文件中的代码，我想明智地替换员工ID的部门。我知道如何提取记录但不知道如何更新记录。

  public class EmployeeController extends Controller {
        public Result addEmployee() {
            Employee newEmployee = new Employee(100001L, "Test", "User", "HR");
            newEmployee.save();
            return ok("Employee Created!");
        }

        public Result addEmployee1() {
            Employee newEmployee = new Employee(100002L, "Test", "User2", "DEPT001");
            newEmployee.save();
            return ok(Json.toJson(newEmployee));
        }

        public Result UpdateEmployee() {
            Employee oldrecord = Employee.find.byId(100002L);
        }
}