FilmDatabase.kt

@Database(entities = arrayOf(Film::class), version = 1)
abstract class FilmDatabase : RoomDatabase() {

    abstract fun filmDao(): FilmDao

    companion object {
        private var INSTANCE: FilmDatabase? = null

        fun getFilmDatabase(context: Context): FilmDatabase {
            if (INSTANCE == null) {
                INSTANCE = Room.databaseBuilder(context.applicationContext, FilmDatabase::class.java, "film.db")
                        .build()
            }
            return INSTANCE!!
        }
    }

}