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Have you ever used Room

how to implement room db?

Room is an ORM, Object Relational Mapping library. In other words, Room will map our database objects to Java objects. Room provides an abstraction layer over SQLite to allow fluent database access while harnessing the full power of SQLite.

  • Database : This component represents data holder. The annotated class should be an abstract class that extends RoomDatabase. At runtime, you can acquire an instance of it by calling Room.databaseBuilder() or Room.inMemoryDatabaseBuilder().
  • DAO : DAOs are the main component of Room and are responsible for defining the methods that access the database. All queries are written in DAO only.
  • IEntity : This component represents a database row of table. Each field of the entity is persisted in the database unless you annotate it with @Ignore .

Difference between room and sqlite

  • In case of SQLite, There is no compile time verification of raw SQLite queries. But in Room there is SQL validation at compile time.
  • As your schema changes, you need to update the affected SQL queries manually. Room solves this problem.
  • You need to use lots of boilerplate code to convert between SQL queries and Java data objects. But, Room maps our database objects to Java Object without boilerplate code.
  • Room is built to work with LiveData and RxJava for data observation, while SQLite does not:

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