如何在 Spring MVC 中使用 Hibernate 和 Spring JPA 更新数据

Question

首先我只是一个喜欢学习Spring框架的初学者。我正在使用Spring MVC 与Hibernate 和Spring JPA 创建简单的在线国内航班预订系统。当我要更新注册用户的姓名、电子邮件和联系电话时，就会出现这个问题。

my-profile.jsp（update-user.jsp 的链接）

<a href='<spring:url value="/account/my-profile/${user.id}.html"/>'>
    <button type="button">My Profile</button>
</a>

更新用户.jsp

<form:form modelAttribute="userUpdate" method="POST" cssClass="userValidation" >


  <div>
    <label for="name">Name</label>
    <div>
      <form:input path="name" name="name"/>
      <form:errors path="name"/>
    </div>
  </div>

  <div>
    <label for="email">Email</label>
    <div class="col-sm-10">
      <form:input path="email" name="email"/>
      <form:errors path="email"/>
    </div>
  </div>

  <div>
    <label for="contactNum">Contact No</label>
    <div>
      <form:input path="contactNum" name="contactNum"/>
      <form:errors path="contactNum"/>
    </div>
  </div>

</form:form>

UserController.java

@RequestMapping(value="/account/my-profile/{id}", method={RequestMethod.POST})
public String showProfile(@PathVariable int id, ModelMap model, 
                          @Valid @ModelAttribute("userUpdate") User user,
                          @ModelAttribute("user") User user2, 
                          BindingResult result,Authentication authentication){

    if(result.hasErrors()){
        return "my-profile";
    }

    String name = authentication.getName();
    User user3 = userService.findOne(name);
    userService.save(user3);

    return "redirect://flightInfos/booknow/payments.html?success=true";
}

用户服务.java

public void save(User user) {
    user.setEnabled(true);
    BCryptPasswordEncoder encoder = new BCryptPasswordEncoder();
    user.setPassword(encoder.encode(user.getPassword()));

    List<Role> roles = new ArrayList<Role>();
    roles.add(roleRepository.findByName("ROLE_USER"));
    user.setRoles(roles);
    userRepository.save(user);      
}

public User findOne(String name) {
    return userRepository.findByName(name);
}

UserRepository.java

public interface UserRepository extends JpaRepository<User, Integer> {
    User findByName(String name);
}

当我运行此程序时，没有错误，并且以下sql 语句显示在控制台中。

Hibernate: select user0_.id as id1_4_, user0_.contactNum as contactN2_4_, user0_.email as email3_4_, user0_.enabled as enabled4_4_, user0_.name as name5_4_, user0_.password as password6_4_, user0_.userId as userId7_4_ from myUser user0_ where user0_.name is null
Hibernate: select user0_.id as id1_4_, user0_.contactNum as contactN2_4_, user0_.email as email3_4_, user0_.enabled as enabled4_4_, user0_.name as name5_4_, user0_.password as password6_4_, user0_.userId as userId7_4_ from myUser user0_ where user0_.email is null
Hibernate: select user0_.id as id1_4_, user0_.contactNum as contactN2_4_, user0_.email as email3_4_, user0_.enabled as enabled4_4_, user0_.name as name5_4_, user0_.password as password6_4_, user0_.userId as userId7_4_ from myUser user0_ where user0_.name=?
Hibernate: select user0_.id as id1_4_, user0_.contactNum as contactN2_4_, user0_.email as email3_4_, user0_.enabled as enabled4_4_, user0_.name as name5_4_, user0_.password as password6_4_, user0_.userId as userId7_4_ from myUser user0_ where user0_.email=?
Hibernate: select user0_.id as id1_4_, user0_.contactNum as contactN2_4_, user0_.email as email3_4_, user0_.enabled as enabled4_4_, user0_.name as name5_4_, user0_.password as password6_4_, user0_.userId as userId7_4_ from myUser user0_ where user0_.name=?
Hibernate: select role0_.id as id1_3_, role0_.name as name2_3_ from Role role0_ where role0_.name=?
Hibernate: update myUser set contactNum=?, email=?, enabled=?, name=?, password=?, userId=? where id=?
Hibernate: delete from myUser_Role where users_id=?
Hibernate: insert into myUser_Role (users_id, roles_id) values (?, ?)

当我运行这个程序时，数据库中没有发生任何变化。而且我无法使用新凭据或以前的凭据登录。

感谢您帮助查明此案。我需要更新现有用户。他的姓名、电子邮件和联系电话。我能做些什么来解决这个问题？

Role实体

@Entity
public class Role {

    @Id
    @GeneratedValue
    private Integer id;
    private String name;

    @ManyToMany(mappedBy="roles")
    private List<User> users;

    getters and setters

User实体

@Entity
@Table(name = "myUser")
public class User {

@Id
@GeneratedValue
private Integer id;
private String userId;

@Size(min=4, message="Name must be at least 4 characters.")
@UniqueUsername(message="Username exists")
@Column(unique=true)
private String name;

@Size(min=5, message="Password must be at least 5 characters.")
private String password;

@Size(min=1, message="Invalid email")
@Email(message="Invalid email")
@UniqueEmail(message="Email exists")
private String email;
private String contactNum;  
private Boolean enabled;

@ManyToMany
@JoinTable
private List<Role> roles;

getters & setters

Answer 1

你在哪里更新？在您的控制器中，您只是从数据库中获取用户并在之后立即保存它。

User user3 = userService.findOne(name); userService.save(user3);

您应该使用新数据更新 user3。 我会这样做。

User user3 = userService.findOne(name); updateUser(user3, user); userService.save(user3);

updateUser 方法：

private void updateUser(oldUser, newUser){ oldUser.setName(newUser.getName()); oldUser.setEmail(newUser.getEmail()); oldUser.setContactNum(newUser.getContactNum()) }