Ok guys, even if the gql query is running I'm still not able to port
this logic into my java class.
Maybe someone could have a look at my code and correct/refer to my
mistake(s):
public GuestbookDetails( final PageParameters parameters ) throws
StringValueConversionException {
PersistenceManager pm = PMF.getPersistenceManager();
try {
Antwort a = pm.getObjectById( Antwort.class,
parameters.getAsLong( Constants.ID ) );
}
catch (NullPointerException e) {
System.out.println( "No entity found." );
}
try {
Antwort a = pm.getObjectById( Antwort.class,
parameters.getLong( Constants.ID ) );
}
catch (NullPointerException e) {
System.out.println( "No entity found." );
}
try {
Antwort a = pm.getObjectById( Antwort.class,
parameters.getString( Constants.ID ) );
}
catch (NullPointerException e) {
System.out.println( "No entity found." );
}
try {
Antwort a = pm.getObjectById( Antwort.class,
parameters.getKey( Constants.ID ) );
}
catch (NullPointerException e) {
System.out.println( "No entity found." );
}
Key k = KeyFactory.createKey( Antwort.class.getSimpleName(),
parameters.getLong( Constants.ID ) );
try {
Antwort a = pm.getObjectById( Antwort.class, k );
}
catch (NullPointerException e) {
System.out.println( "No entity found." );
}
}
As you can imagine all querys result in the NullPointerException.
Parameters.getLong always returns me the value of "ID/Name" (e.g.
1,2,3...).
Apart from that I tried to fetch get my entities using the datastore
object. Yet without success:
DatastoreService datastore =
DatastoreServiceFactory.getDatastoreService();
Entity entity = null;
try {
entity = datastore.get( k );
}
catch (EntityNotFoundException e) {
System.out.println( "No entity found." );
}
And last but not least with a simple query:
Query q = new Query( Constants.ANTWORT );
q.addFilter( Constants.ID, FilterOperator.EQUAL,
parameters.getLong( Constants.ID ) );
PreparedQuery pq = datastore.prepare(q);
Entity entity = pq.asIterator().next();
(....)
I think you already know the answer...
Maybe someone is able to help me out.
Thanks in advance,
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