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Oracle Fusion Middleware Java API Reference for Oracle TopLink 11g Release 1 (11.1.1) E28847-01 |
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SUMMARY: REQUIRED | OPTIONAL | DETAIL: ELEMENT |
@Target(value={METHOD,FIELD})
@Retention(value=RUNTIME)
public @interface Transformation
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).
ReadTransformer
, WriteTransformer
, Transformation can be specified within an Entity, MappedSuperclass and Embeddable class.
Optional Element Summary | |
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javax.persistence.FetchType |
fetch (Optional) Defines whether the value of the field or property should be lazily loaded or must be eagerly fetched. |
boolean |
optional (Optional) The optional element is a hint as to whether the value of the field or property may be null. |
public abstract javax.persistence.FetchType fetch
public abstract boolean optional
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SUMMARY: REQUIRED | OPTIONAL | DETAIL: ELEMENT |