Hi Lasse,
Lambrecht, Lasse (Allianz Deutschland AG) wrote:
Hello everybody,
I'm trying to get some of the information stored in the repository
files (of my o/r mapping). So far I tried something like this to get
the "translation" from the Java name of an attribute to the DB2
column name - which works fine:
DescriptorRepository lRepository =
ojbBrokerRef.getDescriptorRepository(); try { ClassDescriptor lClass
= lRepository.getDescriptorFor(persistenteKlasse); FieldDescriptor
lField = lClass.getFieldDescriptorByName(feldname); lResult =
lField.getColumnName(); } catch (ClassNotPersistenceCapableException
e) { .... }
Now two questions: a) is there a way to do the opposite? I have a DB2
table/column name and want to get the Java name. Sure, I can iterate
through all ClassDescriptors, but that seems not the perfect solution
(my repository-XML is close to 1 MB).
Sorry, OJB doesn't provide such specific "reverse"-methods! If this
happens more then a few times and performance is significant, I
recommend to map table-name/ClassDescriptor once on startup of the
application (if different repository profiles are used you have to take
care of this too -
http://db.apache.org/ojb/docu/guides/metadata.html#Object+metadata+profiles).
b) how can I find a field, if I
don't know, in which ClassDescriptor the field is located? I only
have a field name in some rare situations. The fieldname is unique.
The only way I see is to, again, iterate through all
ClassDescriptors.
yep! Or again map this by your own on startup of the application.
I would recommend to write a simple test to check the time period for
CLD-iteration and then decide which way to go.
regards,
Armin
Regards Lasse Lambrecht
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