@DiscriminatorColumn @DiscriminatorValue註解，jpa多個entity對應一張表

Table Columns: id, product_name, type, entity1,entity2

以type字段爲區別, @DiscriminatorValue(name="baseType") baseType對應BaseEntity, 保存或查詢時type="baseType".

Entity1和Entity2和保存或查詢時type="entity1Type"和type="entity2Type"

 

@Entity

@Table(name = "base_table_name")

@Inheritance(strategy=InheritanceType.SINGLE_TABLE)

@DiscriminatorColumn(name="type",discriminatorType=DiscriminatorType.STRING)

@DiscriminatorValue(name="baseType")

public class BaseEntity{

    @Id

    @Column(name = "id")

    private String id;

   @Column(name = "product_name")

    private String productName;

}

@Entity

@DiscriminatorValue(name="entity1Type")

public class Entity1 extends BaseEntity{

   @Column(name = "entity1")

    private String entity1;

}

@Entity

@DiscriminatorValue(name="entity2Type")

public class Entity2 extends BaseEntity{

   @Column(name = "entity2")

    private String entity2;

}