Hibernate 4.2.21 GenerationType.SEQUENCE

Question

我正在使用Hibernate 4.2.21 Final，生成我使用的ID：策略= GenerationType.SEQUENCE

@Id 
@SequenceGenerator(name = "ApplicationSequence", sequenceName =
"application_seq", allocationSize=1)
@GeneratedValue(strategy=GenerationType.SEQUENCE, generator="ApplicationSequence")      
@Column(name = "application_id", unique = true, nullable = false) private Long id;

我的问题是关于为什么Hibernate以随机的方式生成我的ID ...

如1,2,3,67,89,96等...

当我的allocationSize = 1时？应该是这样的：1,2,3,4,5,6。

修改： ORACLE 12中的证据

CREATE SEQUENCE  "OSYDBA"."APPLICATION_SEQ"  
MINVALUE 1 MAXVALUE 9999999999999999999999999999 
INCREMENT BY 1 START WITH 1
CACHE 20 NOORDER  NOCYCLE  NOPARTITION ;

Answer 1

不要让Oracle预先缓存任何序列值：

CREATE SEQUENCE APPLICATION_SEQ
      INCREMENT BY 1
      START WITH 1
      NOMAXVALUE
      NOCYCLE
      NOCACHE;