如何在Spring MVC中使用Hibernate和Spring JPA更新數據

Question

首先，我只是一個初學者，喜歡學習Spring框架。 我正在使用帶有Hibernate和Spring JPA Spring MVC創建簡單的在線國內航班預訂系統。 當我要更新注冊用戶的姓名，電子郵件和聯系方式時，會出現此問題。

my-profile.jsp（update-user.jsp的鏈接）

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

update-user.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";
}

UserService.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);
}

當我運行此命令時，沒有錯誤存在，並且控制台中顯示以下sql語句。

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 (?, ?)

當我運行該程序時，數據庫中沒有任何更改。 而且我也無法使用新憑據或以前的憑據進行日志記錄。

感謝您為查明此案提供的幫助。 我需要更新現有用戶。 他的姓名，電子郵件和聯系方式。 我該怎么辦才能解決這個問題？

Role實體

@Entity
public class Role {

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

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

    getters and setters

User實體

@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

您在哪里更新？ 在您的控制器中，您只是從db中獲取用戶，然后立即保存它。

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

您應該使用新數據更新user3。 我會這樣做。

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()) }