实体的id自增策略

 主键自增一：
        @Id
        @SequenceGenerator(name="seq",sequenceName="oracle_seq")
        @GeneratedValue(strategy=GenerationType.SEQUENCE, generator="seq")
        private long id;

 普通：
        @Id
        @Column(length = 20, name = "id")
        private String id;

 UUID:
        @Id
        @GenericGenerator(name = "uuid", strategy = "uuid")
        @GeneratedValue(generator = "uuid")
        @Column(length = 32, name = "s_id")
        private String id;


UUID替换掉-：
UUID.randomUUID().toString().replace("-","");