What are room database migrations?

What are room database migrations?

Room database migrations are a way to manage changes to your database schema in Android applications. They allow you to update the database structure without losing existing data.

How do I create a migration in Room?

To create a migration in Room, you need to define a Migration object that specifies the old and new database versions, and implement the necessary SQL statements to transform the data.

Can you give me an example of a migration?

Sure! For instance, if you want to add a new column to a table, you would create a Migration object that includes the SQL command: 'ALTER TABLE tableName ADD COLUMN newColumnName INTEGER DEFAULT 0;'

What happens if I don't handle migrations?

If you don't handle migrations, your app may crash or behave unexpectedly when the database schema changes, leading to data loss or corruption.