Will Richardson

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How to: Pull an app database from android app

November 22, 2014Will Richardson

Writing an app on android that uses a database is a bit of a pain - I spent a fair amount of time creating a wrapper around the default interface that makes it behave a bit more like Arel and so I don’t have to worry about too much SQL. Maybe I’ll post it sometime..

I thought debugging the database would be impossible without writing a part of the app that dumps the data onto the screen, but it turns out..

This answer on StackOverflow basically tells you how to pull the database using the adb command into a SQLite .db file that can be read with an app like this (Or some better alternative, please?)

Basically to set it up you should run this (Assuming you have brew installed and adb correctly in your path)

# The bundled version doesn't have zlib
brew reinstall openssl
# So we can use the openssl commands anywhere
echo "export PATH=/usr/local/opt/openssl/bin:\$PATH" >> ~/.bash_profile

Save this as db_pull in your $PATH or working directory.

adb backup -f ./data.ab -noapk $app
dd if=data.ab bs=1 skip=24 | openssl zlib -d | tar -xvf -

This can be used like so: db_pull com.example.app. You can find the .db file in the folder that gets created and open that with SQLite Browser.

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