I want to do a simple Key-Only query using a key (so to test the existence of it in the datastore).
Whats the simplest way in java of doing this?
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I want to do a simple Key-Only query using a key (so to test the existence of it in the datastore).
Whats the simplest way in java of doing this?
For checking the existence of one entity by key, the simplest and cheapest would be to simply use
get():Get (1 read operation) is cheaper the query (1 read + 1 small): http://code.google.com/appengine/docs/billing.html