Hi Mark:
The KeyFactory.keyToString and KeyFactory.stringToKey should be
what you want. KeyFactory.keyToString converts a Key instance to a
plain String which can be passed to browser and then be sent back to
server later by another user request. The server can convert it to a
Key by calling KeyFactory.stringToKey and use the key in a query.
Thomas
On 4月5日, 下午10時22分, Mark <[email protected]> wrote:
> Hi,
>
> I set up a persistent class like this:
>
> @PersistenceCapable
> public class Farm
> {
> @PrimaryKey
> @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
> private Key mKey;
> }
>
> I might send a representation of this object down to a client browser.
> I imagine it could be in JSON format. How can I include the mKey id so
> that the client can interact with the Farm instance later on? I see
> Key has a method getId() which returns a long. Is this what we can
> send down to the client? I basically want to expose a service like
> this:
>
> mysite.com/plowfarm?id=abc
>
> so I need a way to get this particular Farm instance out of the data
> store again from some random client, which will only know about
> strings it reads from a JSON object:
>
> String qs = "SELECT FROM org.myproject.farms.server.data.Farm WHERE
> mKey == " + id;
>
> Is that long id the answer to this?
>
> Thanks
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