Androidda Room yordamida ma'lumotlar bazasiga qanday kirish mumkin?

Androidda Room yordamida ma'lumotlar bazasiga kirish uchun bir nechta bosqichni bajarish kerak:

1. Entitlarni (Entity) aniqlash — ma'lumotlar bazasining jadvallarini tasvirlovchi sinflar.
2. DAO (Data Access Object) yaratish — ma'lumotlarga kirish uchun metodlar bilan interfeys (qo'shish, yangilash, so'rovlar).
3. Ma'lumotlar bazasini (Database) yaratish — RoomDatabase'dan meros olgan abstrakt sinf, u entitlar va DAO'ni bog'laydi.

Misol:

@Entity
data class User(
    @PrimaryKey val id: Int,
    val name: String
)

@Dao
interface UserDao {
    @Query("SELECT * FROM User WHERE id = :userId")
    fun getUserById(userId: Int): User

    @Insert
    fun insertUser(user: User)
}

@Database(entities = [User::class], version = 1)
abstract class AppDatabase : RoomDatabase() {
    abstract fun userDao(): UserDao
}

// Foydalanish
val db = Room.databaseBuilder(
    context,
    AppDatabase::class.java, "database-name"
).build()

val userDao = db.userDao()
val user = userDao.getUserById(1)

Shu tarzda, DAO orqali, siz ma'lumotlar bazasiga so'rovlar yuborishingiz mumkin, va Room zarur bo'lgan kodni avtomatik ravishda generatsiya qiladi.