我有使用JPA Tools生成的用户实体和角色实体。用户和角色具有多对多的关系。我使用以下代码来插入admin,但是没有数据插入到user_role表中。另外我注意到角色类有@JoinTable但是用户类没有它。有差异吗?
private void addAdmin() {
User admin = new User();
admin.setDisplayName("admin");
Role role1 = new Role();
role1.setRole("ROLE_SUPER_ADMIN");
Role role2 = new Role();
role2.setRole("ROLE_END_USER");
List<Role> roles = new ArrayList<Role>();
roles.add(role1);
roles.add(role2);
admin.setRoles(roles);
userRepository.save(admin);
}
以下是我的用户类:
@Entity
@NamedQuery(name="User.findAll", query="SELECT u FROM User u")
public class User implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
private int id;
@Column(name="display_name")
private String displayName;
//bi-directional many-to-many association to Role
@ManyToMany(mappedBy="users")
private List<Role> roles;
}
以下是我的角色类:
@Entity
@NamedQuery(name="Role.findAll", query="SELECT r FROM Role r")
public class Role implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
private int id;
private String role;
//bi-directional many-to-many association to User
@ManyToMany
@JoinTable(
name="user_role"
, joinColumns={
@JoinColumn(name="role_id")
}
, inverseJoinColumns={
@JoinColumn(name="user_id")
}
)
private List<User> users;
}
答案 0 :(得分:0)
@Entity
public class User {
@ManyToMany
private List<Role> roles;
}
@Entity
public class Role {
@ManyToMany
private List<User> users;
}
public class Auth {
User newUser = new User("username","password");
userDao.save(newUser);
Role newRole_1 = new Role("ADMIN");
Role newRole_2 = new Role("USER");
roleDao.save(newRole_1);
roleDao.save(newRole_2);
List<Role> roles = roleDao.findAll();
User user = userDao.findOne(user_id); // e.g. Long user_id = 1L;
for (Role role : roles) {
user.getRoles().add(role);
}
userDao.save(user);
}
如果您创建了新对象:
User user = new User();
Role role = new Role();
List<Role> roles = new ArrayList<>();
这些对象是瞬态的,而Hibernate并不适用它们。 Hibernate适用于持久对象。因此,您必须使用方法save();找一个();找到所有();和其他。