Difference between revisions of "EclipseLink/UserGuide/JPA/Basic JPA Development/Mapping/Basic Mappings/Default Conversions and Converters/Converter"

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* [http://www.eclipse.org/eclipselink/api/latest/org/eclipse/persistence/annotations/Converter.html Converter]}}
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* [http://www.eclipse.org/eclipselink/api/latest/org/eclipse/persistence/annotations/Converter.html @Converter]}}
  
=@Converter Annotation=
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=@Converter=
 
You can use <tt>@Converter</tt> annotation to specify a custom converter for modification of the data value(s) during the reading and writing of a mapped attribute.
 
You can use <tt>@Converter</tt> annotation to specify a custom converter for modification of the data value(s) during the reading and writing of a mapped attribute.
 
<source lang="java">  
 
<source lang="java">  
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{{EclipseLink_AttributeTable
 
{{EclipseLink_AttributeTable
|caption=<span id="Table 19-7">@Converter Attributes</span>
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|caption=<span id="@Converter Attributes">@Converter Annotation Attributes</span>
 
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  <td>'''<tt>name</tt>'''</td>
 
  <td>'''<tt>name</tt>'''</td>
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}}
 
}}
  
This example shows how to use the <tt>@Converter</tt> annotation to specify <tt>Employee</tt> field <tt>gender</tt>.
 
  
<span id="Example 19-7"></span>
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The following example shows how to use the <tt>@Converter</tt> annotation to specify <tt>Employee</tt> field <tt>gender</tt>.
''''' Usage of the @Converter Annotation'''''
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 +
<span id="Example: @Converter Annotation"></span>
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======''Example: @Converter Annotation''======
 
<source lang="java">
 
<source lang="java">
 
  @Entity
 
  @Entity

Latest revision as of 10:35, 4 May 2011

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[edit] @Converter

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(); 
 }
@Converter Annotation Attributes
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.

[edit] 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;
     }
     ...
 }


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