@GeneratedValue

From CauchoWiki

The @GeneratedValue annotation specifies auto-generation parameters and methods for primary keys. The @GeneratedValue is used with the @Id annotation. For example, MySQL provides a auto_increment attribute and Postgres and Oracle provide sequences.

 @Entity
 public class TestBean {
    @Id
    @GeneratedValue
    public int getId()
     ...
 }

[edit] Annotation Definition

 public @interface GeneratedValue {
       GenerationType strategy() default AUTO;

       String generator() default "";
 }

Main article: GenerationType

 public enum GenerationType {
     TABLE,
     SEQUENCE,
     IDENTITY,
     AUTO
 }

attribute	description	default
strategy	the auto-generation strategy Amber should use	AUTO
generator	sequence or table name	""

strategy	description
AUTO	Choose type depending on database, e.g. IDENTITY for MySQL
IDENTITY	An auto-increment type of key generation, e.g. MySQL
SEQUENCE	Use a sequence for key generation, e.g. Postgres or Oracle
TABLE	Use a separate Amber-controlled table for key generation

[edit] Related annotations

• @Id annotation for a primary key