Room: The official persistence library
summary
Room is Google's official SQLite-backed persistence library in Architecture Components that generates DAOs and schema code via an annotation processor validates SQL, enforces a non-main-thread policy for database I/O, and requires schema export for migrations. It maps entities to tables, supports type converters and @Embedded flattening, returns LiveData or Rx types for observable queries, and plugs into the Paging component for large result sets. Migrations are manual SQL migrations and the library is in beta.
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chapters (15)
- 0:00Introduction to Room
- 1:06State of Android persistence
- 4:39Room in Architecture Components
- 7:07Setting up Room dependencies
- 10:01Room’s three main components
- 17:51Defining entities in Room
- 19:16Data Access Objects explained
- 25:44Creating the Room database
- 27:12Threading and async queries
- 30:28Type converters for custom types
- 32:53Embedding objects in entities
- 33:58Migrating data in Room
- 37:52Handling large result sets
- 40:03Foreign key and relation support
- 42:09Summary and resources
