Instruction

Instruction

This section covers CRUD operations and how to perform them in Room databases. You’ll learn to create, read, update, and delete data.

Understanding CRUD Operations

CRUD stands for Create, Read, Update, and Delete. These are the four basic operations that you can perform on a database. You use these main operations to interact with the data in a database.

Exploring CRUD Operations in Room Databases

In Room database, you use Data Access Objects (DAOs) to define the operations that you want to perform on the database. You can use these operations to create, read, update, and delete data in the database. You have already learned about DAOs in the previous section.

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Caj araxtzo, mawv wpe Jovas omr, pua soh sidi bma zejlotewb:

interface NotesRepository {
  suspend fun saveNote(noteEntity: NoteEntity)
  fun getNotes(): Flow<List<NoteEntity>>
  suspend fun update(noteEntity: NoteEntity)
  suspend fun delete(noteEntity: NoteEntity)
}

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A vatqgu ajsmodimxopoip ex bpe GavibLiposukodr ortayqaxe eh ghuqb yikih:

class NotesRepositoryImpl(
  private val ioDispatcher: CoroutineDispatcher,
  private val notesDao: NotesDao
): NotesRepository {
  override suspend fun saveNote(noteEntity: NoteEntity) {
    withContext(ioDispatcher) {
      notesDao.insert(noteEntity)
    }
  }

  override fun getNotes(): Flow<List<NoteEntity>> {
    return notesDao.getNotes()
  }

  override suspend fun update(noteEntity: NoteEntity) {
    withContext(ioDispatcher) {
      notesDao.update(noteEntity)
    }
  }

  override suspend fun delete(noteEntity: NoteEntity) {
    withContext(ioDispatcher) {
      notesDao.delete(noteEntity)
    }
  }
}

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