Sorry, did not have enough explanation.
I corrected it a little.
I think that the method of confirming the parent existence is simple.
It uses Entity#getParent()
How about the following examples?
String parentKindName = "parentKind"; //Parent Kindname
String kindName = "kindName"; // Child Kindname
DatastoreService service = DatastoreServiceFactory.getDatastoreService
();
Query query = new Query(kindName);
PreparedQuery pq = service.prepare(query);
List<Entity> list = pq.asList(FetchOptions.Builder.withOffset(0));
for (Entity e : list) {
e.getProperty("xx"); //get childproperty
....
//Parent check
PreparedQuery parentPq = service.prepare(new Query
(parentKindName,e.getParent()));
int parentCount = parentPq.countEntities();
if (parentCount == 0){
//abandoned children
}
}
Please try.
Thanks,
seleronm
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