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Difference between revisions of "EclipseLink/UserGuide/JPA/Basic JPA Development/Mapping/Basic Mappings/Default Conversions and Converters/Converter"
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Revision as of 12:35, 2 May 2011
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Key API
@Converter Annotation
You can use @Converter annotation to specify a custom converter for modification of the data value(s) during the reading and writing of a mapped attribute.
@Target({TYPE, METHOD, FIELD}) @Retention(RUNTIME) public @interface Converter { String name(); Class converterClass(); }
Attribute | Description | Default | Required? |
---|---|---|---|
name | Set this attribute to the String name for your converter. Ensure that this name is unique across the persistence unit | Yes | |
converterClass | Set this attribute to the Class of your converter. This class must implement the EclipseLink org.eclipse.persistence.mappings.converters.Converter interface. | Yes |
The following example shows how to use the @Converter annotation to specify Employee field gender.
Example: @Converter Annotation
@Entity public class Employee implements Serializable{ ... @Basic @Converter ( name="genderConverter", converterClass=org.myorg.converters.GenderConverter.class ) @Convert("genderConverter") public String getGender() { return gender; } ... }