Currently almost all type mapping on entity fields is done in
com.google.appengine.datanucleus.StoreFieldManager#storeFieldInEntity and
com.google.appengine.datanucleus.TypeConversionUtils#pojoValueToDatastoreValue.
This is quite unflexible, since this hinders writing custom mapping classes.
If one tries to keep ones entities free of appengine specific SCOs (like Text
for Strings greater than 500byte for example), the only option right now is to
use byte[] with the "serialized" property set in the metadata. In the "Text"
example, this leads to clutter the entity with non-trivial getter/setter code,
that does the actual conversion from String to byte[] and vice versa.
It would be great, if the current way of converting values for the targetted
datastore (GAE in this case), was would be more tailored to the type conversion
subsystem, as intended by DN. This would allow for greater flexibility when it
comes to writing entities or converting existing entities to GAE.
For reference, my current setup:
* DataNucleus 3.1.1 (using JDO-API)
* Targetting two platforms:
** GAE 1.7.4 (using DataNucleus-Appengine 2.1.1)
** Standard servlet container (using Datanucleus-RDBMS)
Original issue reported on code.google.com by krupi...@synyx.de on 5 Feb 2013 at 12:56
Original issue reported on code.google.com by
krupi...@synyx.deon 5 Feb 2013 at 12:56