บันทึกข้อมูลในฐานข้อมูลของเครื่องโดยใช้ Room   เป็นส่วนหนึ่งของ Android Jetpack

dependencies {     val room_version = "2.7.2"      implementation("androidx.room:room-runtime:$room_version")      // If this project uses any Kotlin source, use Kotlin Symbol Processing (KSP)     // See Add the KSP plugin to your project     ksp("androidx.room:room-compiler:$room_version")      // If this project only uses Java source, use the Java annotationProcessor     // No additional plugins are necessary     annotationProcessor("androidx.room:room-compiler:$room_version")      // optional - Kotlin Extensions and Coroutines support for Room     implementation("androidx.room:room-ktx:$room_version")      // optional - RxJava2 support for Room     implementation("androidx.room:room-rxjava2:$room_version")      // optional - RxJava3 support for Room     implementation("androidx.room:room-rxjava3:$room_version")      // optional - Guava support for Room, including Optional and ListenableFuture     implementation("androidx.room:room-guava:$room_version")      // optional - Test helpers     testImplementation("androidx.room:room-testing:$room_version")      // optional - Paging 3 Integration     implementation("androidx.room:room-paging:$room_version") }

dependencies {     def room_version = "2.7.2"      implementation "androidx.room:room-runtime:$room_version"      // If this project uses any Kotlin source, use Kotlin Symbol Processing (KSP)     // See KSP Quickstart to add KSP to your build     ksp "androidx.room:room-compiler:$room_version"      // If this project only uses Java source, use the Java annotationProcessor     // No additional plugins are necessary     annotationProcessor "androidx.room:room-compiler:$room_version"      // optional - RxJava2 support for Room     implementation "androidx.room:room-rxjava2:$room_version"      // optional - RxJava3 support for Room     implementation "androidx.room:room-rxjava3:$room_version"      // optional - Guava support for Room, including Optional and ListenableFuture     implementation "androidx.room:room-guava:$room_version"      // optional - Test helpers     testImplementation "androidx.room:room-testing:$room_version"      // optional - Paging 3 Integration     implementation "androidx.room:room-paging:$room_version" }

@Entity data class User(     @PrimaryKey val uid: Int,     @ColumnInfo(name = "first_name") val firstName: String?,     @ColumnInfo(name = "last_name") val lastName: String? )

@Entity public class User {     @PrimaryKey     public int uid;      @ColumnInfo(name = "first_name")     public String firstName;      @ColumnInfo(name = "last_name")     public String lastName; }

@Dao interface UserDao {     @Query("SELECT * FROM user")     fun getAll(): List<User>      @Query("SELECT * FROM user WHERE uid IN (:userIds)")     fun loadAllByIds(userIds: IntArray): List<User>      @Query("SELECT * FROM user WHERE first_name LIKE :first AND " +            "last_name LIKE :last LIMIT 1")     fun findByName(first: String, last: String): User      @Insert     fun insertAll(vararg users: User)      @Delete     fun delete(user: User) }

@Dao public interface UserDao {     @Query("SELECT * FROM user")     List<User> getAll();      @Query("SELECT * FROM user WHERE uid IN (:userIds)")     List<User> loadAllByIds(int[] userIds);      @Query("SELECT * FROM user WHERE first_name LIKE :first AND " +            "last_name LIKE :last LIMIT 1")     User findByName(String first, String last);      @Insert     void insertAll(User... users);      @Delete     void delete(User user); }

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

@Database(entities = {User.class}, version = 1) public abstract class AppDatabase extends RoomDatabase {     public abstract UserDao userDao(); }

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

AppDatabase db = Room.databaseBuilder(getApplicationContext(),         AppDatabase.class, "database-name").build();

val userDao = db.userDao() val users: List<User> = userDao.getAll()

UserDao userDao = db.userDao(); List<User> users = userDao.getAll();