Database schema updates

Question

I\'m working on an AIR application that uses a local SQLite database and was wondering how I could manage database schema updates when I distribute new versions of the applicati

Answer 1

In the case of SQLite, you can make use of the user_version pragma to track the version of the database. To get the version:

PRAGMA user_version

To set the version:

PRAGMA user_version = 5

I then keep each group of updates in an SQL file (that's embedded in the app) and run the updates needed to get up to the most recent version:

Select Case currentUserVersion
Case 1
  // Upgrade to version 2
Case 2
  // Upgrade to version 3
Case etc...
End Select

This allows the app to update itself to the most recent version regardless of the current version of the DB.