 Customize JPA field name mapping using EclipseLink [message #1180319] |
Sun, 10 November 2013 23:08 |
 Jianbao Tao
Messages: 1
Registered: November 2013 |
Junior Member |
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I need to map camel-case names to underscore-separated names in my current project, which uses EclipseLink, due to historical reasons. I know we can customize name mapping individually in JPA, but we have a long list of camel-case names to change, so we want to avoid that kind of boilerplate codes if all possible.
What I want to achieve is as follows. Suppose we have an entity class as below:
@Entity
public class FooBar {
@Id @GeneratedValue
private Long id;
@Temporal( TemporalType.TIMESTAMP )
private Date dateCreated;
}
I want this class maps to a table with name "foo_bar" and columns "id" and "date_created". Note that all names in database are in lower case.
I googled around, and found a solution for changing table names. However, I can't figure out how to change field names in an entity class.
Below is my name-mapping customizer, where the method updateFieldNameMappings() is not giving what I want. So, how do I do this correctly?
public class JpaNameMappingCustomizer implements SessionCustomizer {
@Override
public void customize( Session session ) throws Exception {
Map<Class, ClassDescriptor> descs = session.getDescriptors();
Collection<ClassDescriptor> descriptors = descs.values();
// This code assumes single table per descriptor!
for (ClassDescriptor desc : descriptors) {
String fullClassName = desc.getJavaClassName();
String className= Helper.getShortClassName( fullClassName );
String tableName = camelCaseToUnderscore(className);
desc.setTableName( tableName );
updateFieldNameMappings(desc);
}
}
private void updateFieldNameMappings( ClassDescriptor desc ) {
for (DatabaseMapping mapping : desc.getMappings()) {
if (mapping.isDirectToFieldMapping()) {
DirectToFieldMapping directMapping = (DirectToFieldMapping) mapping;
// oldFieldName is something like "foo_bar.ID"
String oldFieldName = directMapping.getFieldName();
String newFieldName = camelCaseToUnderscore( oldFieldName ); // wrong
directMapping.setFieldName( newFieldName );
}
}
}
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