坚持以一对一的关系实体在休眠 - 实体分离

Question

我有一个关系一个两代表一：

用户：

create table users (

    id int not null primary key, 
    username varchar2(40) not null unique, 
    password varchar2(60) not null, 
    firstName varchar2(40) not null, 
    lastName varchar2(40) not null, 
    personalId varchar2(11) unique, 
    city varchar2(40), 
    address varchar2(40), 
    email varchar2(40) not null unique, 
    phone varchar2(9) unique 
); 

UsersAccounts

create table usersAccounts (
    id int primary key, 
    accountNr varchar2(26) not null unique, 
    balance float not null, 
    createDate date not null, 
    expiredDate date, 
    lastCharge date, 
    userId int constraint userAccount_fk_user references users(id), 
); 

我的实体：

用户

@Entity 
@Table(name = "users") 
public class User implements Serializable { 

    private static final long serialVersionUID = 1L; 
    @Id 
    @GeneratedValue 
    @Column(name = "id") 
    private Integer id; 
    @NotBlank 
    @NotNull 
    @Size(min = 3, max = 40) 
    @Column(name = "username") 
    private String username; 
    @NotBlank 
    @NotNull 
    @Size(min = 3, max = 60) 
    @Column(name = "password") 
    private String password; 
    @NotBlank 
    @NotNull 
    @Size(min = 3, max = 40) 
    @Column(name = "firstName") 
    private String firstName; 
    @NotBlank 
    @NotNull 
    @Size(min = 3, max = 40) 
    @Column(name = "lastName") 
    private String lastName; 
    @Size(min = 11, max = 11) 
    @Column(name = "personalId") 
    private String personalId; 
    @Size(max = 40) 
    @Column(name = "city") 
    private String city; 
    @Size(max = 40) 
    @Column(name = "address") 
    private String address; 
    @NotBlank 
    @NotNull 
    @Email 
    @Size(max = 40) 
    @Column(name = "email") 
    private String email; 
    @Size(min = 9, max = 9) 
    @Column(name = "phone") 
    private String phone; 
    @OneToMany(mappedBy = "user", cascade = CascadeType.ALL, fetch = FetchType.EAGER) 
    private Set<UserRole> userRoleSet; 
    @OneToOne(mappedBy = "user") 
    private UserAccount userAccount; 

UserAccount

@Entity 
@Table(name = "usersAccounts") 
public class UserAccount implements Serializable { 

    private static final long serialVersionUID = 1L; 
    @Id 
    @GeneratedValue 
    @Column(name = "id") 
    private Integer id; 
    @NotNull 
    @Column(name = "accountNr") 
    private String accountNr; 
    @NotNull 
    @Column(name = "balance") 
    private float balance; 
    @NotNull 
    @Column(name = "createDate") 
    private Date createDate; 
    @Column(name = "expiredDate") 
    private Date expiredDate; 
    @Column(name = "lastCharge") 
    private Date lastCharge; 
    @OneToOne(cascade = CascadeType.ALL) 
    @JoinColumn(name = "userId") 
    private User user; 

我试着坚持这一点，但我有错误：

@RequestMapping(value = "/admin/addAdmin", method = RequestMethod.POST) 
public String addAdmin(@ModelAttribute("user") UserDto userDto, 
     BindingResult result) { 
    AddUserValidator addUserValidator = new AddUserValidator(); 
    addUserValidator.validate(userDto, result); 
    if (result.hasErrors()) { 
     return "admin/addadmin"; 
    } else { 
     ErrorMessage errorMessage; 
     User user = prepareModelUser(userDto); 
     if ((errorMessage = userService.createUser(user)) != null) { 
      result.rejectValue(errorMessage.getPath(), 
        errorMessage.getDescription()); 
      return "admin/addadmin"; 
     } else { 
      user = userService.findByUsername(user.getUsername()); 
      UserRole userRole = new UserRole("ROLE_ADMIN"); 
      userRole.setUser(user); 
      userRoleService.createUserRole(userRole); 
      UserAccount ua = new UserAccount(); 
      ua.setAccountNr("12345678901"); 
      ua.setBalance(100); 
      DateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy"); 
      Date date = new Date(); 
      String dateStr = dateFormat.format(date); 
      try { 
       ua.setCreateDate(dateFormat.parse(dateStr)); 
      } catch (ParseException e) { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 
      } 
      user = userService.findUser(user.getId()); 
      ua.setUser(user); 
      userAccountService.createUserAccount(ua); 
      return "redirect:/admin/adminlist"; 
     } 
    } 
} 

当我尝试坚持我得到这个错误：

SEVERE: Servlet.service() for servlet [appServlet] in context with path [/ibank] threw exception [Request processing failed; nested exception is javax.persistence.PersistenceException: org.hibernate.PersistentObjectException: detached entity passed to persist: pl.piotr.ibank.model.User] with root cause org.hibernate.PersistentObjectException: detached entity passed to persist: pl.piotr.ibank.model.User

userRole.setUser(user); userRoleService.createUserRole(userRole);节约不错，但当我尝试ua.setUser(user); userAccountService.createUserAccount(ua);我得到分离实体

Answer 1

将主键同时设为外键是非常糟糕的做法。特别是当你有@GeneratedValue就可以了。

仔细一看，您的实体映射正常，但usersAccounts表需要调整。从id列中删除该外键约束，并添加新列userId，这将是外键users#id。之后的一切都应该有效。