我想注册一个使用 Spring MVC 3、Hibernate 和 PostgresQL 的用户。这是我要提交的表格:
<form:form name="registerForm" method="post"
action="registerNewUser.html" commandName="user">
<table>
<tr>
<td><spring:message code="label.userName" /></td>
<td><form:input path="userName" /></td>
<td><form:errors path="userName" cssClass="error" /></td>
</tr>
<tr>
<td><spring:message code="label.password" /></td>
<td><form:password path="password" /></td>
<td><form:errors path="password" cssClass="error" /></td>
</tr>
<tr>
<td><spring:message code="label.password" /></td>
<td><form:password path="retypePassword" /></td>
<td><form:errors path="retypePassword" cssClass="error" /></td>
</tr>
<tr>
<td colspan="2"><input type="submit"
value="<spring:message code="register.label" />" /></td>
</tr>
</table>
</form:form>
这是我要保存的 POJO:
@Entity
@Table(name = "user_table")
public class User {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "id")
private Long id;
@Column(name = "user_name", nullable = false, length = 50)
private String userName;
@Column(name = "password", nullable = false, length = 50)
private String password;
private String retypePassword;
// getters setters
这是控制器的相关部分:
@RequestMapping(value = "/registerNewUser", method = RequestMethod.POST)
public String saveNewUser(@ModelAttribute User user, BindingResult result, Model model, HttpSession session) {
UserValidator validator = new UserValidator();
validator.validateUser(user, result, userService.existingUser(user));
String ret = REGISTER_USER;
if (!result.hasErrors()) {
user.setPassword(PasswordEncripter.md5(user.getPassword()));
userService.save(user);
ret = goToPractice(user, model, session);
}
return ret;
}
因为我觉得将 retypePassword 的值存储在数据库中很浪费,所以我没有为此创建列。当我提交表单时,这导致了以下异常:
org.postgresql.util.PSQLException: ERROR: column user0_.retypepassword does not exist
我可以通过将“retypePassword”列添加到表中来轻松修复此异常,但我仍然觉得这会很浪费。有没有什么聪明的方法可以解决问题而不在数据库中添加重复数据?