[hibernate-issues] [Hibernate-JIRA] Created: (HHH-4443) Allow generic handling of any Hibernate type for post-insert generated identifiers
Allow generic handling of any Hibernate type for post-insert generated identifiers
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Key: HHH-4443
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-4443
Project: Hibernate Core
Issue Type: Improvement
Components: core
Reporter: Steve Ebersole
Assignee: Steve Ebersole
Fix For: 3.5
See HB-92 for the original request. Much of the discussion unfortunately occurred in a
private email thread with the original requester, but here is the proposed solution:
Steve Ebersole <steve(a)hibernate.org> wrote:
The "more correct" solution is along the lines a contract to allow the
type to handle this like you said. I'm thinking something like an
optional interface for the type to publish that fact:
public interface ResultSetIdentifierConsumer {
public Serializable consumeIdentifier(ResultSet resultSet);
}
then IdentifierGeneratorFactory (called IdentifierGeneratorHelper now
btw) can say:
public static Serializable get(ResultSet rs, Type type) ... {
if ( type instanceof ResultSetIdentifierConsumer ) {
return ( ( ResultSetIdentifierConsumer ) type ).consumeIdentifier(
rs );
}
Class clazz = type.getReturnedClass();
if ( clazz == Long.class ) {
return new Long( rs.getLong( 1 ) );
}
else if ( clazz == Integer.class ) {
return new Integer( rs.getInt( 1 ) );
}
else if ( clazz == Short.class ) {
return new Short( rs.getShort( 1 ) );
}
else if ( clazz == String.class ) {
return rs.getString( 1 );
}
else {
throw ...
}
}
and you can define a type :
public class MyCustomLongIdType ... implements ResultSetIdentifierConsumer
... {
public Serializable consumeIdentifier(ResultSet resultSet) {
return new MyCustomLongId( resultSet.getLong( 1 ) );
}
...
}
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