关于java：日期被覆盖（Spring / Hibernate）

Date gets overwritten (Spring/Hibernate)

现在我的主页上有一个"预订"表，显示不同预订的信息。其中一个字段是"预订日期"，显示创建预订的日期和时间。但当我编辑预订时，它会自动被新日期覆盖。我该如何防止这种情况发生？

我的预订课

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@Entity
@Table(name="booking")
public class Booking {

@Id
@Column(name="id")
@GeneratedValue(strategy= GenerationType.IDENTITY)
private Long id;

@ManyToOne
@JoinColumn(name="R_id")
private Restaurant restaurant;

@Column(name="date")
@Temporal(TemporalType.DATE)
private Date date;

@Column(name="start")
private String start;

@Column(name="duration")
private float duration;

@Column(name="amount_of_people")
private int amountOfPeople;

@Column(name="name")
private String name;

@Column(name="contact_preference")
private String contactPreference;

@Column(name="phone_number")
private String phoneNumber;

@Column(name="comments")
private String comments;

// Date that gets overwritten
@Column(name="current_datetime")
@Type(type="timestamp")
private Date currentDatetime;

@Column(name="new_date")
@Type(type="timestamp")
private Date newDate;

public Long getId() {
return id;
}

public void setId(Long id) {
this.id = id;
}

public Restaurant getRestaurant() {
return restaurant;
}

public void setRestaurant(Restaurant restaurant) {
this.restaurant = restaurant;
}

public Date getDate() {
return date;
}

public void setDate(Date date) {
this.date = date;
}

public String getStart() {
return start;
}

public void setStart(String start) { this.start = start; }

public float getDuration() {
return duration;
}

public void setDuration(float duration) {
this.duration = duration;
}

public int getAmountOfPeople() {
return amountOfPeople;
}

public void setAmountOfPeople(int amountOfPeople) {
this.amountOfPeople = amountOfPeople;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public String getContactPreference() {
return contactPreference;
}

public void setContactPreference(String contactPreference) {
this.contactPreference = contactPreference;
}

public String getPhoneNumber() { return phoneNumber; }

public void setPhoneNumber(String phoneNumber) { this.phoneNumber = phoneNumber; }

public String getComments() {
return comments;
}

public void setComments(String comments) {
this.comments = comments;
}

public Date getCurrentDatetime() {
return currentDatetime;
}

public void setCurrentDatetime(Date currentDatetime) { this.currentDatetime = currentDatetime; }

public Date getNewDate() { return newDate; }

public void setNewDate(Date newDate) { this.newDate = newDate; }

// Comparator
public static class BookingDateComparator implements Comparator<Booking> {
@Override
public int compare(Booking booking1, Booking booking2) {
if (booking1.getDate().compareTo(booking2.getDate()) == 0) {
return booking1.getStart().compareTo(booking2.getStart());
}
return booking1.getDate().compareTo(booking2.getDate());
}
}

}

我的主控制器类中的相关方法：

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@RequestMapping(value ="bookings", method = RequestMethod.GET)
public String bookings(Model model) {
List<Booking> bookingList = bookingService.getBookings();
model.addAttribute("bookings", bookingList);
initModelList(model);
return"bookings";
}
@RequestMapping(value ="booking/create", method = RequestMethod.GET)
public String createBooking(Model model) {
model.addAttribute("booking", new Booking());
initModelList(model);
return"newBooking";
}

@RequestMapping(value ="booking/create", method = RequestMethod.POST)
public String createBookingAction(@Valid @ModelAttribute ("booking") Booking booking, BindingResult result, Model model) {
BookingFormValidator bookingFormValidator = new BookingFormValidator();
bookingFormValidator.validate(booking, result);
if (result.hasErrors()) {
initModelList(model);
return"newBooking";
}
bookingService.addBooking(booking);
return"redirect:/bookings";
}

@RequestMapping(value ="booking/edit/{id}", method = RequestMethod.GET)
public String editBooking(@PathVariable Long id, Model model) {
initModelList(model);
Booking booking = bookingService.getBooking(id);
model.addAttribute("booking", booking);
return"editBooking";
}

@RequestMapping(value ="booking/edit/{id}", method = RequestMethod.POST)
public String editBookingAction(@Valid @ModelAttribute ("booking") Booking booking, BindingResult result, Model model) {
BookingFormValidator bookingFormValidator = new BookingFormValidator();
bookingFormValidator.validate(booking, result);
if (result.hasErrors()) {
initModelList(model);
return"editBooking";
}
bookingService.updateBooking(booking);
return"redirect:/bookings";
}

号

我主页的.jsp

<body>
<jsp:include page="../fragments/menu.jsp"/>

<section class="content-wrapper main-content clear-fix">

List of bookings

<p>

Add restaurant
Create New Booking

</p>
<table class="">
<tr>
<th>
Booking information
</th>
<th></th>
</tr>

<c:forEach items="${restaurants}" var="restaurants">
<tr>
<td>${restaurants}</td>
<td valign="bottom">Edit restaurant</td>

<tr>
<table>
<col align="left" width="100">
<col align="left" width="60">
<col align="left" width="60">
<col align="left" width="60">
<col align="left" width="60">
<col align="left" width="90">
<col align="left" width="90">
<col align="left" width="90">
<col align="left" width="100">
<col align="left" width="100">
<tr>
<td align="left">Date</td>
<td align="left">Start</td>
<td align="left">Duration</td>
<td align="left"># Of People</td>
<td align="left">Name</td>
<td align="left">Contact Pref.</td>
<td align="left">Phone #</td>
<td align="left">Comments</td>
<td align="left">Booking date</td>
</tr>
<c:forEach items="${sortedBooking}" var="sortedBooking">
<c:choose>
<c:when test="${restaurants == sortedBooking.restaurant.restaurantName}">
<tr>
<td>${sortedBooking.date}</td>
<td>${sortedBooking.start}</td>
<td>${sortedBooking.duration}</td>
<td>${sortedBooking.amountOfPeople}</td>
<td>${sortedBooking.name}</td>
<td>${sortedBooking.contactPreference}</td>
<c:choose>
<c:when test="${sortedBooking.phoneNumber.equals('')}">
<td>NO PHONE</td>
</c:when>
<c:otherwise>
<td>${sortedBooking.phoneNumber}</td>
</c:otherwise>
</c:choose>
<c:choose>
<c:when test="${sortedBooking.comments.equals('')}">
<td>NO COMMENTS</td>
</c:when>
<c:otherwise>
<td>${sortedBooking.comments}</td>
</c:otherwise>
</c:choose>
<td>${sortedBooking.currentDatetime}</td>
<td>Edit booking</td>
</tr>
</c:when>
</c:choose>
</c:forEach>
</table>
</tr>
</tr>
</c:forEach>
</table>

</section>

<jsp:include page="../fragments/footer.jsp"/>

</body>

我的editbooking.jsp：

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<body>
<jsp:include page="../fragments/menu.jsp"/>

<section class="content-wrapper main-content clear-fix">

Edit

<form:form modelAttribute="booking">
<table>
<tr>
<td>Restaurant*:</td>
<td><form:select path="restaurant.id">
<form:option value="" label="--- Select ---" />
<form:options items="${restaurants}" itemValue="id" itemLabel="restaurantName" />
<td><form:errors path="restaurant.id" cssClass="error"/></td>
</form:select>
</tr>
<tr>
<td>Date*:</td>
<td><form:input path="date" type="date"/></td>
<td><form:errors path="date" cssClass="error"/></td>
</tr>
<tr>
<td>Starting time*:</td>
<td><form:input path="start" type="time"/></td>
<td><form:errors path="start" cssClass="error"/></td>
</tr>
<tr>
<td>Duration*:</td>
<td><form:input path="duration"/></td>
<td><form:errors path="duration" cssClass="error"/></td>
</tr>
<tr>
<td>Amount of people*:</td>
<td><form:input path="amountOfPeople"/></td>
<td><form:errors path="amountOfPeople" cssClass="error"/></td>
</tr>
<tr>
<td>Name*:</td>
<td><form:input path="name"/></td>
<td><form:errors path="name" cssClass="error"/></td>
</tr>
<tr>
<td>Contact preference*:</td>
<td><form:select path="contactPreference">
<form:option value="" label="--- Select ---" />
<form:option value="e-mail" label="E-mail" />
<form:option value="phone" label="Phone" />
<form:option value="other" label="Other" />
<td><form:errors path="contactPreference" cssClass="error"/></td>
</form:select>
</tr>
<tr>
<td>Phone number:</td>
<td><form:input path="phoneNumber"/></td>
<td><form:errors path="phoneNumber" cssClass="error"/></td>
</tr>
<tr>
<td>Comments:</td>
<td><form:textarea path="comments" rows="5" cols="30"/></td>
<td><form:errors path="comments" cssClass="error"/></td>
</tr>
<tr>
<td colspan="3"><input type="submit" /></td>
</tr>
</table>
</form:form>

Back to List

</section>

<jsp:include page="../fragments/footer.jsp"/>

</body>

。

感谢您的帮助！对不起，这封长信。

编辑：我试图更改我的代码以禁用更新，但它仍然不起作用。

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@Column(name="current_datetime", updatable=false, nullable=false)
@Type(type="timestamp")
private Date currentDatetime = new Date();