我使用的是jpa实体listner类where和spring数据仓库。在@PreMethod更新中，如果我使用@Transactional(propagation = Propagation.REQUIRES_NEW)，我将直接从数据库获取数据。如果我在私有方法（getOldEmployee）上使用相同的transactional annotation，即called inside @PreMethod，我不会从数据库获取数据，而是使用相同的最新会话数据，不知道为什么会发生这种行为

实体类

@Entity
@Table(name = "Employee")
@EntityListeners({EmployeeListener.class)
public class Employee extends AuditEntity implements Serializable {

}

高级课程

@Component
 public class EmployeeListner{
 
 @Autowired
 EmployeeRepository employeeRepository;

  @PreUpdate
  @Transactional(propagation = Propagation.REQUIRES_NEW)   //if use here I get the employee database value before updating the database
  public void preUpdateEvent(Employee employee) {
    Employee employee=getOldEmployee(employee);
  }

  private Employee getOldEmployee(Employee employee) {     //if inspite of using  @Transactional(propagation = Propagation.REQUIRES_NEW) in @PreMethod if use here I am not getting the database value rather getting latest value
    Optional<Employee> getOldEmployeeOptional =employeeRepository.findById(employee.getId());
    getOldEmployeeOptional  
  }
}