Publish updates of database with an Application upgrade/new version
We use the SQLite database for our app, we are faced with a question, whenever we release the new version of the application of DB (schema) changes you have uninstall the currently installed version and then re-install the latest version to get the latest changes to DB.
Is there a way where we can run script DB with the upgrade of the application. We intend to use the methods LifeCycleListener, we run the script at the start method.
Hello.
If you add just new columns nullable or nine tables, you can certainly run a DDL script in the appropriate LifeCycleListener method. In some cases, you will need to create a temporary database, copy all the data, then delete the current DB and put the temperature in his place.
To simplify things, I suggest you add a 'version' table in your database where you will store the version number of DB. Just do a quick query to obtain the number, then run the appropriate DDL statements.
However you app is distributed, there is the possibility that users might ignore some updatesif app they were offline for an extended period. Therefore, you should check that your code is able to apply all relevant DB updates sequentially. This means that, if a user updates to v1.0 v3.0 (jump v2, 0), the app starts the DB from 1.0 to 2.0, then from 2.0 to 3.0. In other words: never assume that all users update to current-1 to the current version.
Best regards
Frédéric Desbiens
Senior Product Manager
Mobility and Cloud oracle
Twitter: @BlueberryCoder
blog: http://blogs.oracle.com/blueberry
Tags: Oracle Mobile
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