Hi Charlie,
Your easiest option here is probably to upload an alternate major version of
your app with the old schema, and use that to retrieve and fix the faulty
entit(y|ies). Alternate approaches include using the low level datastore
API, or uploading a Python version that uses the low level API or
db.Expando.
-Nick Johnson
On Wed, Jun 17, 2009 at 9:15 AM, Charlie Zhu <zh.char...@gmail.com> wrote:
>
> Hi,
>
> I have tried all ways I known to delete some schema changing caused
> error Entities and failed.
>
> 1. Delete on Data Viewer on the console.
> Data Viewer shows "No Data Yet."
>
> 2. Delete by code
> Below is part of the codes:
> Query q = pm.newQuery(CDKFingerprint.class);
> List<CDKFingerprint> results2;
> results2 = (List<CDKFingerprint>) q.execute();
> pm.deletePersistentAll(results2);
> But that cause server error:
> java.lang.NullPointerException: Datastore entity with kind
> CDKFingerprint and key CDKMol(c=cc=cc=c)/CDKFingerprint(1) has a null
> property named bits_count. This property is mapped to
> cdkhelper.CDKFingerprint.bits_count, which cannot accept null values.
> ...
> at org.datanucleus.jdo.JDOPersistenceManager.deletePersistentAll
> (JDOPersistenceManager.java:795)
> ...
>
> 3. Assign values to the NULL field then delete
> The code
> for(CDKFingerprint r: results2) {
> r.bits_count = 0;
> pm.makePersistent(r);
> }
> And server error again
> java.lang.NullPointerException: Datastore entity with kind
> CDKFingerprint and key CDKMol(c=cc=cc=c)/CDKFingerprint(1) has a null
> property named bits_count. This property is mapped to
> cdkhelper.CDKFingerprint.bits_count, which cannot accept null values.
> ...
> at org.datanucleus.store.appengine.query.StreamingQueryResult
> $AbstractListIterator.hasNext(StreamingQueryResult.java:205)
> ...
>
> Having no idea and hoping help.
>
> Regards,
> Charlie
>
> >
>
--
Nick Johnson, App Engine Developer Programs Engineer
Google Ireland Ltd. :: Registered in Dublin, Ireland, Registration Number:
368047
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