how to implement auto increment in jpa

Question

I am about learning JPA, and I want to know how can we tel the entity manager that the primary key field is generated using the database auto increment to the table? I am using Mysql 5.5 and Oracle Enterprise For Eclipse(OEFE) thanks for help

Answer 1

If you have an identifier called id which needs to be auto incremented then:

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;