Sorry for asking the nth permutation of this question, but i'm stymied.
I'm running GAE for python2.5 on OS X, and i'm losing all data between reboots. From what I understand from related SO posts, the default location for local datastore file is wiped with each reboot. I have tried changing the location to a central /datastores directory with:
dev_appserver.py --datastore_path=/Users/Me/gae_apps/datastores /Users/Me/gae_apps/app_1
which doesn't generate an error, but when i fire up dev_appserver.py after rebooting, I see this output, and the data is again wiped:
WARNING 2011-07-14 17:50:56,297 urlfetch_stub.py:108] No ssl package found. urlfetch will not be able to validate SSL certificates.
INFO 2011-07-14 17:50:57,653 appengine_rpc.py:159] Server: appengine.google.com
INFO 2011-07-14 17:50:57,722 appcfg.py:453] Checking for updates to the SDK.
INFO 2011-07-14 17:50:58,448 appcfg.py:470] The SDK is up to date.
WARNING 2011-07-14 17:50:58,448 datastore_file_stub.py:511] Could not read datastore data from /var/folders/ps/psEgjl3fF+C5hecCKN2AW++++TI/-Tmp-/dev_appserver.datastore
INFO 2011-07-14 17:50:58,486 rdbms_sqlite.py:58] Connecting to SQLite database '' with file '/var/folders/ps/psEgjl3fF+C5hecCKN2AW++++TI/-Tmp-/dev_appserver.rdbms'
WARNING 2011-07-14 17:50:58,521 dev_appserver.py:4700] Could not initialize images API; you are likely missing the Python "PIL" module. ImportError: No module named _imaging
INFO 2011-07-14 17:50:58,689 dev_appserver_multiprocess.py:637] Running application portfolio on port 8080: http://localhost:8080
I should mention that i have several apps, all of which sit in separate directories under /Users/Me/gae_apps/
Not sure if this is related to the failure to read dev_appserver.datastore and subsequent switch to SQLite or not.
Any help would be greatly appreciated. thanks!
Doing this "*--blobstore_path=/Users/me/Documents/workspace/app-name/ --datastore_path=/Users/me/Documents/workspace/app-name/datastore.rbm*", is working for me, on OS X.
I had this problem in Linux for one of the versions of GAE. What I did then was run dev_appserver.py without specifying datastore_path. I then locate dev_appserver.datastore and/or dev_appserver.rdbms (I forget which now) which was in /tmp in Linux. I then copied both these files to my ~/gae/datastore/.
After that when I ran dev_appserver.py with --datastore_path it worked without any issues.
Not sure if it will work on OS X but its worth a shot.
Possibly a sledgehammer to crack a nut here but if the patches are no help you can script the AppEngine and force it to use a different path on startup.
Have you tried inserting any data in the datastore after starting up the server with the new datastore location? When I don't insert any new data, I get the error you mention: Could not read datastore data from ....
However, when I start up my app, register, and then restart the app, I get no errors, and the new datastore location is used.
Maybe I'm misreading your question and you are inserting data after the restart. In that case, I can't reproduce your issue.
I have been struggling with this issue for a very long time. This finally worked, thanks to the answer by said-omar.
Simply add this as your flag: --datastore_path=/Users/me/Documents/workspace/app-name/datastore.rbm
..obviously changing everything before "/datastore.rbm" to point to the directory where you want the database stored.
来源：https://stackoverflow.com/questions/6697990/google-app-engine-local-datastore-path-configuration