[英]How to use UUID Generator in Spring DATA JPA?
我想加入两个模型,两者都使用 org.hibernate.id.UUIDGenerator 作为主键。 但是在启动时,我收到以下错误:
org.hibernate.tool.schema.spi.CommandAcceptanceException:通过 Z82269B9B71AB4A7732F695C 语句执行 DDL“更改表 user_role 添加约束 FK5scdquo6f12cpstqai86x4biw 外键 (roles_role_id) 引用角色 (role_id)”时出错
你知道,我做错了什么吗?
我的代码:
用户 Model:
@Entity
@Table
public class User implements Serializable {
@Id
@GeneratedValue(generator = "uuid2")
@GenericGenerator(name = "uuid2", strategy = "org.hibernate.id.UUIDGenerator")
@Column(name = "user_id", columnDefinition = "VARCHAR(255)")
private String userId;
@Column(name = "name")
private String name;
@JoinTable(name = "user_role", joinColumns = @JoinColumn(name = "userId"), inverseJoinColumns = @JoinColumn(name = "roleId"))
@ManyToMany
private List<Role> roles;
public User(){
this.roles = new ArrayList<>();
}
// Getter & Setter
}
角色 Model:
@Entity
@Table
public class Role implements Serializable {
@Id
@GeneratedValue(generator = "uuid2")
@GenericGenerator(name = "uuid2", strategy = "org.hibernate.id.UUIDGenerator")
@Column(name = "role_id", columnDefinition = "VARCHAR(255)")
private String roleId;
@Column(name = "role_name")
private String name;
@Column(name = "description")
private String description;
@ManyToMany(mappedBy = "roles")
private List<User> users;
public Role(){
this.users = new ArrayList<>();
}
// Getter & Setter
}
用户 DAO:
public interface UserDAO extends JpaRepository<User, String > {
}
角色 DAO:
public interface RoleDAO extends JpaRepository<Role, String > {
}
您的连接列的名称应与列名称相似,而不是 model 变量名称。 在您的情况下,您应该使用
joinColumns = @JoinColumn(name = "user_id")
和
inverseJoinColumns = @JoinColumn(name = "role_id"))
不是
joinColumns = @JoinColumn(name = "userId")
和
inverseJoinColumns = @JoinColumn(name = "roleId"))
也对所有连接列执行此操作
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