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POHow to unpack sqlite3 database written by Google AppEngine bulk downloader
 

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    <p>I need to download all instances of fairly large (multi-GB) entity in my app's datastore. I have enough disk space to store the entity's data, but not enough to store both the original data that the bulk downloader retrieves as an SQLite database <em>and</em> the processed version of the data that the downloader writes after applying the transforms specified in my bulkloader.yaml file. Given this, I'm fairly certain that the bulk download operation would successfully retrieve the SQLite database, and then fail when trying to apply the transforms.</p> <p>This might be okay since there's another system available to which I <em>could</em> move the SQLite database and where I could unpack it. (The other system that's available to me has Python installed but not a version that supports the AppEngine tools -- and I don't have permission to upgrade Python on that machine -- so I cannot do the bulk download directly there.) I could retrieve the data I need <em>if</em> I could write some Python code to load the SQLite database and read its result table, but I cannot figure out what to make of the SQLite data -- when I use the SQLite module to connect to the database and unpack rows of the table, they appear to contain metadata in addition to the data that I'm interested in (the data that my AppEngine app actually placed in the datastore).</p> <p>I know that the appcfg.py bulk download process can read this data, since it can transform the data in the ways I specify in bulkloader.yaml, but I haven't located the AppEngine toolkit code that does this unpacking. Any help or pointers would be appreciated.</p>
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