org.eclipse.persistence.annotations

public @Interface Transformation

Annotations

@Target:METHOD, FIELD
@Retention:RUNTIME

Imports

java.lang.annotation.Retention, .Target, jakarta.persistence.FetchType

Transformation is an optional annotation for org.eclipse.persistence.mappings.TransformationMapping. TransformationMapping allows to map an attribute to one or more database columns. Transformation annotation is an optional part of TransformationMapping definition. Unless the TransformationMapping is write-only, it should have a ReadTransformer, it defines transformation of database column(s) value(s)into attribute value. Also unless it's a read-only mapping, either WriteTransformer annotation or WriteTransformers annotation should be specified. Each WriteTransformer defines transformation of the attribute value to a single database column value (column is specified in the WriteTransformer).

Author: Andrei Ilitchev
Since: EclipseLink 1.0
See Also: org.eclipse.persistence.annotations.ReadTransformer, org.eclipse.persistence.annotations.WriteTransformer, Transformation can be specified within an Entity, MappedSuperclass and Embeddable class.

Method Summary

Modifier and Type	Method and Description
public FetchType	fetch() (Optional) Defines whether the value of the field or property should be lazily loaded or must be eagerly fetched.
public boolean	optional() (Optional) The optional element is a hint as to whether the value of the field or property may be null.

Inherited from java.lang.annotation.Annotation:: annotationType equals hashCode toString

Method Detail

fetch	back to summary
public FetchType fetch() (Optional) Defines whether the value of the field or property should be lazily loaded or must be eagerly fetched. The EAGER strategy is a requirement on the persistence provider runtime that the value must be eagerly fetched. The LAZY strategy is a hint to the persistence provider runtime. If not specified, defaults to EAGER.

optional	back to summary
public boolean optional() (Optional) The optional element is a hint as to whether the value of the field or property may be null. It is disregarded for primitive types, which are considered non-optional.