Question

我创建了一个由休眠完美创建的“用户”表，对此没有任何问题。问题出在我的第二个模型（称为“角色”的实体）上，该模型是具有@ManyToOne关系的模型，我不知道为什么，但是休眠无法创建第二个表。

我的服务器是具有AWS RDS的Mysql实例。第一个表是由休眠创建的，而不是第二个。

@实体公共类字符{

@Id
@GeneratedValue(strategy=GenerationType.AUTO)
private Integer id;
@ManyToOne
private User joueur;
private String pseudo;
private Integer points;


public Character() {
    super();
}

public Character(User joueur) {
    // appel a l'autre constructeur
    this(joueur, null, null);
}

public Character(User joueur, String pseudo,Integer points) {
    super();
    this.joueur = joueur;
    this.pseudo = pseudo;
    this.points = points;
}

public Integer getId() {
    return id;
}

public String getPseudo() {
    return pseudo;
}

public void setPseudo(String pseudo) {
    this.pseudo = pseudo;
}

public Integer getPoints() {
    return points;
}

public void setPoints(Integer points) {
    this.points = points;
}

public User getJoueur() {
    return joueur;
}

}

@Entity // //告诉Hibernate用该类制作一个表公共类用户{

@Id
@GeneratedValue(strategy=GenerationType.AUTO)
private Integer id;
private String username;
private String password;
@OneToMany(mappedBy = "joueur")
@OrderBy("id ASC")
private List<Character> personnages;
private String league;
private Integer points; 


public Integer getId() {
    return id;
}

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

public String getUsername() {
    return username;
}

public void setUsername(String username) {
    this.username = username;
}

public String getPassword() {
    return password;
}

public void setPassword(String password) {
    this.password = password;
}

public List<Character> getPersonnages() {
    return personnages;
}

public void setPersonnages(List<Character> personnages) {
    this.personnages = personnages;
}

public String getLeague() {
    return league;
}

public void setLeague(String league) {
    this.league = league;
}

public Integer getPoints() {
    return points;
}

public void setPoints(Integer points) {
    this.points = points;
}

}

@Controller
@RequestMapping（path =“ / init”）公共类MainController {

@Autowired // This means to get the bean called userRepository
           // Which is auto-generated by Spring, we will use it to handle the data
private UserRepository userRepository;

@Autowired 
private CharacterRepository characterRepository;

@GetMapping(path="/add") // Map ONLY GET Requests
public String addNewUser () {

    User joueur = new User();
    joueur.setUsername("testUser");
    joueur.setPassword("password");
    joueur.setLeague("Bronze");
    joueur.setPoints(10000);
    userRepository.save(joueur);

    Character perso = new Character(joueur,"testPerso1",1000);
    characterRepository.save(perso);

    return "";
}

@GetMapping(path="/all")
public @ResponseBody Iterable<User> getAllUsers() {
    // This returns a JSON or XML with the users
    return userRepository.findAll();
}

}

我有此错误： “ com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException：您的SQL语法有误；请查看与您的MySQL服务器版本相对应的手册，以获取在'字符添加约束FKdf2yvyvitaqt2u7de3ywfjcv外键（joueur_id）引用附近使用正确的语法'在第1行”

Answer 1

好吧，我找到了解决方法... JPA批注放弃了表'Character'的名称，只需更改表的名称即可，它将完美地工作，愚蠢的JPA ...

Hibernate无法创建具有@ManyToOne关系的表

1 个答案: