关于ENTITY BEAN的ID属性

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;
       
    @Column(name = "NICK_NAME")
    private String nickName;

 

不使用自动生成的ID列，将nickname设置为ID：

 

    @Id   
    private String nickname;

 

或用构造器：

 

    public ForumUser(String nickname, String realName, Date joinDate) {
        this.nickname = nickname;
        this.realName = realName;
        this.joinDate = joinDate;
    }