You can set the chunk size to 100 or use one of the non iterator query
methods. By default only 20 results are loaded at a time so for 100
results the iterator does 5 queries.
On 22 Feb 2010, at 02:23, Ftaylor wrote:
Is this the fastest way to load all of the Elements of a given type
from the DataStore?
@SuppressWarnings("unchecked")
public static final List<Page> loadAllPagesFromDataStore() {
List<Page> pages = new ArrayList<Page>();
PersistenceManager pm = PMF.get().getPersistenceManager();
Query query = null;
try {
query = pm.newQuery(Page.class);
List<Page> results = (List<Page>)query.execute();
if(results.iterator().hasNext()) {
Iterator<Page> it = results.iterator();
while(it.hasNext())
pages.add(pm.detachCopy(it.next()));
}
} finally {
query.closeAll();
pm.close();
}
return pages;
}
I ask because the datastore is meant to be very fast at reading huge
amounts of data, but slow at writing huge amounts of data, yet this
query is quite slow for only 100 elements.
Thanks,
Finbarr
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