Room 의 다양한 테크닉들 - 1 (Simple Ex)

 

 

id 'kotlin-kapt'

// ROOM
def roomVersion = "2.5.0"

implementation("androidx.room:room-runtime:$roomVersion")
annotationProcessor("androidx.room:room-compiler:$roomVersion")

// To use Kotlin annotation processing tool (kapt)
kapt("androidx.room:room-compiler:$roomVersion")

// Coroutine
implementation("org.jetbrains.kotlinx:kotlinx-coroutines-android:1.6.4")

 

	class MainActivity : AppCompatActivity() {
	override fun onCreate(savedInstanceState: Bundle?) {
	super.onCreate(savedInstanceState)
	setContentView(R.layout.activity_main)
	val db = TextDatabase.getDatabase(this)
	val inputArea = findViewById<EditText>(R.id.textInputArea)
	val insertBtn = findViewById<Button>(R.id.insert)
	val getAllBtn = findViewById<Button>(R.id.getData)
	val deleteBtn = findViewById<Button>(R.id.delete)
	insertBtn.setOnClickListener {
	CoroutineScope(Dispatchers.IO).launch {
	db.textDao().insert(TextEntity(0, inputArea.text.toString()))
	inputArea.setText("")
	}
	}
	getAllBtn.setOnClickListener {
	CoroutineScope(Dispatchers.IO).launch {
	Log.d("MAIN", db.textDao().getAllData().toString())
	}
	}
	deleteBtn.setOnClickListener {
	CoroutineScope(Dispatchers.IO).launch {
	db.textDao().deleteAllData()
	}
	}
	}
	}

view raw MainActivity.kt hosted with ❤ by GitHub

	<?xml version="1.0" encoding="utf-8"?>
	<androidx.constraintlayout.widget.ConstraintLayout
	xmlns:android="http://schemas.android.com/apk/res/android"
	xmlns:app="http://schemas.android.com/apk/res-auto"
	xmlns:tools="http://schemas.android.com/tools"
	android:layout_width="match_parent"
	android:layout_height="match_parent"
	tools:context=".MainActivity">
	<LinearLayout
	android:layout_width="match_parent"
	android:layout_height="match_parent"
	android:orientation="vertical">
	<EditText
	android:id="@+id/textInputArea"
	android:layout_width="match_parent"
	android:layout_height="50dp"
	android:hint="text"
	android:layout_margin="10dp"
	android:background="@android:color/transparent"/>
	<Button
	android:id="@+id/insert"
	android:text="insert"
	android:layout_width="match_parent"
	android:layout_height="wrap_content"
	android:layout_margin="5dp"/>
	<Button
	android:id="@+id/getData"
	android:text="getData"
	android:layout_width="match_parent"
	android:layout_height="wrap_content"
	android:layout_margin="5dp"/>
	<Button
	android:id="@+id/delete"
	android:text="delete"
	android:layout_width="match_parent"
	android:layout_height="wrap_content"
	android:layout_margin="5dp"/>
	</LinearLayout>
	</androidx.constraintlayout.widget.ConstraintLayout>

view raw activity_main.xml hosted with ❤ by GitHub

	@Database(entities = [TextEntity::class], version = 1)
	abstract class TextDatabase : RoomDatabase() {
	abstract fun textDao() : TextDao
	companion object {
	@Volatile
	private var INSTANCE : TextDatabase? = null
	fun getDatabase(
	context : Context
	) : TextDatabase {
	return INSTANCE ?:synchronized(this){
	val instance = Room.databaseBuilder(
	context.applicationContext,
	TextDatabase::class.java,
	"text_database"
	)
	.fallbackToDestructiveMigration()
	.build()
	INSTANCE = instance
	instance
	}
	}
	}
	}

view raw TextDatabase.kt hosted with ❤ by GitHub

	@Entity(tableName = "text_table")
	data class TextEntity (
	@PrimaryKey(autoGenerate = true)
	@ColumnInfo(name = "id")
	var id : Int,
	@ColumnInfo(name = "text")
	var text : String
	)

view raw TextEntity.kt hosted with ❤ by GitHub

	@Dao
	interface TextDao {
	@Query("SELECT * FROM text_table")
	fun getAllData() : List<TextEntity>
	@Insert(onConflict = OnConflictStrategy.IGNORE)
	fun insert(text : TextEntity)
	@Query("DELETE FROM text_table")
	fun deleteAllData()
	}

view raw TextDao.kt hosted with ❤ by GitHub