1. Single table
@Entity
@Table(name=”USERS”)
@Inheritance(strategy=InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn(name=”USER_TYPE”,
discriminatorType=DiscriminatorType.STRING, length=1)
public abstract class User implements Serializable { … }
@Entity
@DiscriminatorValue(value=”S”)
public class Seller extends User …
@Entity
@DiscriminatorValue(value=”B”)
public class Bidder extends User
2. Joined tables
@Entity
@Table(name=”USERS”)
@Inheritance(strategy=InheritanceType.JOINED)
@DiscriminatorColumn(name=”USER_TYPE”,
discriminatorType=STRING, length=1)
public abstract class User { … }
@Entity
@Table(name=”SELLERS”)
@DiscriminatorValue(value=”S”)
@PrimaryKeyJoinColumn(name=”USER_ID”)
public class Seller extends User { … }
@Entity
@Table(name=”BIDDERS”)
@DiscriminatorValue(value=”B”)
@PrimaryKeyJoinColumn(name=”USER_ID”)
public class Seller extends User { … }
3. Table per class
@Entity
@Table(name=”USERS”)
@Inheritance(strategy=InheritanceType.TABLE_PER_CLASS)
public class User {
…
@Entity
@Table(name=”SELLERS”)
public class Seller extends User {
…
@Entity
@Table(name=”BIDDERS”)
public class Bidder extends User {
