Page History

...

@Embeddable
@Getter
@ToString
public class ExampleKey implements Serializable {

    private static final long serialVersionUID = 1L;

    @Column(name = "name", length = 120)
    private String name;

    @Column(name = "version", length = 20)
    private String version;
}

@Entity
@Table(name = "Example")
@Data
@EqualsAndHashCode
public class JpaExample implements Serializable {

    private static final long serialVersionUID = 1L;

    @EmbeddedId
    @VerifyKey
    @NotNull
    private ExampleKey key;

    @Column
    private Boolean primed;

    @Column(name = "timeStamp", precision = 3)
    @Temporal(TemporalType.TIMESTAMP)
    @NotNull
    private Date timeStamp;
}

Eclipse-Link

...

MariaDB [controlloop]> describe Example;
+-----------+--------------+------+-----+---------+-------+
| Field     | Type         | Null | Key | Default | Extra |
+-----------+--------------+------+-----+---------+-------+
| PRIMED    | tinyint(1)   | YES  |     | 0       |       |
| timeStamp | datetime(3)  | YES  |     | NULL    |       |
| name      | varchar(120) | NO   | PRI | NULL    |       |
| version   | varchar(20)  | NO   | PRI | NULL    |       |
+-----------+--------------+------+-----+---------+-------+

Hibernate

MariaDB [controlloop]> describe Example;
+-----------+--------------+------+-----+---------+-------+
| Field     | Type         | Null | Key | Default | Extra |
+-----------+--------------+------+-----+---------+-------+
| name      | varchar(120) | NO   | PRI | NULL    |       |
| version   | varchar(20)  | NO   | PRI | NULL    |       |
| primed    | bit(1)       | YES  |     | NULL    |       |
| timeStamp | datetime(6)  | YES  |     | NULL    |       |
+-----------+--------------+------+-----+---------+-------+

...

Implications using Hibernate

to To be continued