Data Persistence In Android: There’s Room For Improvement
summary
Room generates DAO implementations, enforces compile-time query checks, and runs inserts/updates synchronously so calling them on the main thread throws an exception; observable queries return LiveData on the main thread by default. Migrations are plain Migration classes added to the Room builder, otherwise Room wipes user data, and schemas get validated against a room_master_table identity hash. Tests use in-memory databases plus InstantTaskExecutorRule for LiveData and MigrationTestHelper with JSON schema dumps to validate migrations and preserved data.
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