[英]Having issues with Hibernate inheritance: @SecondaryTable Annotations
[英]Hibernate: @EmbeddedId, Inheritance and @SecondaryTable
我正在使用帶有注釋的Hibernate版本3.3.2.GA。
我有兩個類之間的繼承,前者:
@Entity
@Table(name = "SUPER_CLASS")
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn(
name="DISCR_TYPE",
discriminatorType= DiscriminatorType.STRING
)
@org.hibernate.annotations.Entity(mutable = false)
public class SuperClass { }
子類與輔助表映射:
@Entity
@DiscriminatorValue("VALUE")
@org.hibernate.annotations.Entity(mutable = false)
@SecondaryTable(name = "V_SECONDARY_TABLE",
pkJoinColumns = @PrimaryKeyJoinColumn(name = "ID", referencedColumnName = "ID"))
public class SubClass extends SuperClass {
@Embedded
public Field getField() {
return getField;
}
}
場地由兩個不同的領域組成
@Embeddable
public class Field {
@Column("FIELD_1") String field1
@Column("FIELD_2") String field2
}
現在,當我在SubClass上創建查詢時,在SuperClass上搜索FIELD_1和FIELD_2字段,即使它們是在子類中定義的。
我無法在字段中的@Column注釋中設置表,因為它在某處重用了Field類。 我需要在SubClass類中指定它。
如何指定應在輔助表中搜索字段?
您應該使用表屬性
@Column("FIELD_1", table="V_SECONDARY_TABLE")
UPDATE
當多個實體使用可嵌入列時,如果需要僅重新映射單個列,則應使用@AttributeOverride;如果需要多個列,則應使用@AttributeOverrides
@Entity
@SecondaryTable(name="OTHER_PERSON")
@AttributeOverride(name="address.street", column=@Column(name="STREET", table="OTHER_PERSON"))
public class Person {
private Address address;
@Id
@GeneratedValue
public Integer getId() { return id; }
public void setId(Integer id) { this.id = id; }
@Embedded
public Address getAddress() { return address; }
public void setAddress(Address address) { this.address = address; }
@Embeddable
public static class Address implements Serializable {
private String address;
public String getStreet() { return street; }
public void setStreet(String street) { this.street = street; }
}
}
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