Inheritance
- All entities must declare a primary key/identifier
- Primary keys should be of the following types: any Java primitive type, any primitive wrapper type; java.lang.String; java.util.Date; java.sql.Date
- Do not use floating-point types!
| Primary Key Example |
|
@Entity
public class EntityClass {
private Long id;
@Id
public Long getId() {
return id; // Application-manged key!
}
}
|
|
- A primary key may be generated by the persistence provider
| Auto-Generated Key Example |
|
- The persistence provider may use a table/sequence to generate keys
| Table-Generated Key Example |
|
Inheritance