android sqlite在线更新，更新应用程序并影响用户输入的数据

Question

I using SQLite as my database.

Using the app, the user can save some item on the database.

But I would like also to update the database from time to time.

The problem is how can I update the database without affecting the user inserted data and in a manner that it will download the new database online and not by updating the app itself.

Answer 1

Since my comment is large, I'll post it as an answer.

You won't find any tutorial showing exactly what you're trying to accomplish, because what you need is somewhat complex (but not difficult)

First approach:

1. You need your app to query some webservice to find out if there's a newer version of the database, and if there is, download it

2. The database must be saved in some temporary location, then you transfer all the users saved data to the new database, and finally replace the apps database with the new database (already updated with user's data)

Another approach would be:

1. Make your app query some webservice to find if the database needs to be updated.

2. If yes, download the SQL commands to modify the database structure.