Create primary key in Oracle and use in Spring data JPA

In Oracle:

　　Create a sequence　　

create sequence seq_newsId
increment by 1
start with 1
maxvalue 999999999;

　　SQL statement to get the sequence

select seq_newsid.nextval from sys.dual;

　　SQL to delete a sequence

DROP SEQUENCE seq_newsId；

In this way, the sequence in Oracle is created.

In Jpa:

　　Entity class configuration

 1 @Id
 2 
 3  @GeneratedValue(strategy=GenerationType.SEQUENCE,generator="mseq")
 4 
 5  @SequenceGenerator(name="mseq",sequenceName="seq_newsId",allocationSize=1)
 6 
 7  @Column(name = "ENTID", unique = true, nullable = false, precision = 22, scale = 0)
 8 
 9  public long getEntid() {
10 
11   return this.entid;
12 
13  }

sequenceName is the sequence created by itself in oracle. allocationSize must be specified as 1, otherwise it will grow by the default 50 numbers.