jakarta.persistence.AttributeOverride

May be applied to an entity that extends a mapped superclass or to an embedded field or property to override a basic mapping or id mapping defined by the mapped superclass or embeddable class (or embeddable class of one of its attributes).

May be applied to an element collection containing instances of an embeddable class or to a map collection whose key and/or value is an embeddable class. When AttributeOverride is applied to a map, "key." or "value." must be used to prefix the name of the attribute that is being overridden in order to specify it as part of the map key or map value.

To override mappings at multiple levels of embedding, a dot (.) notation form must be used in the name element to indicate an attribute within an embedded attribute. The value of each identifier used with the dot notation is the name of the respective embedded field or property.

If AttributeOverride is not specified, the column is mapped the same as in the original mapping.

Example 1:

 @MappedSuperclass
 public class Employee {
     @Id
     protected Integer id;
     @Version
     protected Integer version;
     protected String address;
     public Integer getId() { ... }
     public void setId(Integer id) { ... }
     public String getAddress() { ... }
     public void setAddress(String address) { ... }
 }

 @Entity
 @AttributeOverride(name = "address", column = @Column(name = "ADDR"))
 public class PartTimeEmployee extends Employee {
     // address field mapping overridden to ADDR
     protected Float wage();
     public Float getHourlyWage() { ... }
     public void setHourlyWage(Float wage) { ... }
 }

Example 2:

 @Embeddable
 public class Address {
     protected String street;
     protected String city;
     protected String state;
     @Embedded
     protected Zipcode zipcode;
 }

 @Embeddable
 public class Zipcode {
     protected String zip;
     protected String plusFour;
 }

 @Entity
 public class Customer {
     @Id
     protected Integer id;
     protected String name;
     @AttributeOverride(name = "state",
                        column = @Column(name = "ADDR_STATE"))
     @AttributeOverride(name = "zipcode.zip",
                        column = @Column(name = "ADDR_ZIP"))
     @Embedded
     protected Address address;
     ...
 }

Example 3:

 @Entity
 public class PropertyRecord {
     @EmbeddedId
     protected PropertyOwner owner;
     @AttributeOverride(name = "key.street",
                        column = @Column(name = "STREET_NAME"))
     @AttributeOverride(name = "value.size",
                        column = @Column(name = "SQUARE_FEET"))
     @AttributeOverride(name = "value.tax",
                        column = @Column(name = "ASSESSMENT"))
     @ElementCollection
     protected Map parcels;
 }

 @Embeddable
 public class Address {
     protected String street;
     protected String city;
     protected String state;
     @Embedded
     protected Zipcode zipcode;
 }

 @Embeddable
 public class PropertyInfo {
     Integer parcelNumber;
     Integer size;
     BigDecimal tax;
 }

See Also:

Embedded

Embeddable

MappedSuperclass

AssociationOverride

Since:

Jakarta Persistence (JPA) 1.0