You can run queries on keys:
http://code.google.com/appengine/docs/java/datastore/queriesandindexes.html#Queries_on_Keys
The first part of child key (ContactInfo.class) contains parent
(Employee) key.
Employee e;
....
query = pm.newQuery(ContactInfo.class);
query.setFilter("key == keyParam");
query.declareParameters("com.google.appengine.api.datastore.Key
keyParam");
Key key = KeyFactory.createKey(Employee.class.getSimpleName(),e.getId
());
list = (List<ContactInfo>) query.execute(key);
But it returns empty list because the second part of child key
contains child key itself, so it is never equal.
Maybe something like that will work (assuming that your goal is to
find all child belonging to single parent).
query = pm.newQuery(ContactInfo.class);
query.setFilter("key > keyParam and key < keyParam1");
query.declareParameters("com.google.appengine.api.datastore.Key
keyParam");
query.declareParameters("com.google.appengine.api.datastore.Key
keyParam1");
Key key = KeyFactory.createKey(Employee.class.getSimpleName(),e.getId
());
Key key1 = KeyFactory.createKey(Employee.class.getSimpleName(),e.getId
() + 1);
list = (List<ContactInfo>) query.execute(key,key1);
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