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November 6, 2019 17:04
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Android Room 2.2.1 hierarchy implementation in Kotlin
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| package com.frogmi.feature.information.domain.models | |
| import android.content.Context | |
| import androidx.room.* | |
| /** | |
| * Entities | |
| */ | |
| @Entity(tableName = "infos") | |
| data class Info( | |
| @PrimaryKey val id: String | |
| ) | |
| // Parent data | |
| @Entity(tableName = "datas", | |
| foreignKeys = [ | |
| ForeignKey(entity = Info::class, parentColumns = ["id"], childColumns = ["infoId"]) | |
| ]) | |
| class Data( | |
| @PrimaryKey val id: Int, | |
| var name: String, | |
| @Embedded(prefix = "data1_") val data1: Data1? = null, | |
| @Embedded(prefix = "data2_") val data2: Data2? = null, | |
| var infoId: String = "" | |
| ) | |
| // Parent Data builder | |
| class DataBuilder(id: Int, name: String, d: IData) { | |
| internal val data = when (d) { | |
| is Data1 -> Data(id = id, name = name, data1 = d) | |
| is Data2 -> Data(id = id, name = name, data2 = d) | |
| else -> throw Exception("") | |
| } | |
| var infoId: String = "" | |
| set(_infoId){ | |
| field = _infoId | |
| data.infoId = _infoId | |
| } | |
| } | |
| interface IData | |
| data class Data1( | |
| val field1: String | |
| ): IData | |
| data class Data2( | |
| val field1: String, | |
| val field2: String | |
| ): IData | |
| /** | |
| * Relation class | |
| */ | |
| data class InfoWithData( | |
| @Embedded val info: Info, | |
| @Relation(parentColumn = "id", entityColumn = "infoId", entity = Data::class) | |
| val data: List<Data> | |
| ) | |
| @Dao | |
| abstract class InfoDAO { | |
| @Query("SELECT * FROM infos WHERE id = :id") | |
| abstract fun loadInfo(id: String): InfoWithData | |
| fun insertInfo(info: Info, data: List<DataBuilder>){ | |
| data.forEach { it.infoId = info.id } | |
| _insertInfo(info) | |
| _insertData(data.map { it.data }) | |
| } | |
| @Insert(onConflict = OnConflictStrategy.REPLACE) | |
| abstract fun _insertInfo(info: Info) | |
| @Insert(onConflict = OnConflictStrategy.REPLACE) | |
| abstract fun _insertData(data: List<Data>) | |
| } | |
| // Usage | |
| private lateinit var dao: InfoDAO | |
| private lateinit var db: DummyDataBase | |
| fun use(){ | |
| val context = InstrumentationRegistry.getInstrumentation().context | |
| db = Room.inMemoryDatabaseBuilder( | |
| context, | |
| DummyDataBase::class.java | |
| ).allowMainThreadQueries().build() | |
| dao = db.dao() | |
| val info = Info("information_01") | |
| val dataSubtype1 = Data1("field value 1") | |
| val dataSubtype2 = Data2("field value 1", "field value 2") | |
| val data1 = DataBuilder(0, "Data nombre 1", dataSubtype1) | |
| val data2 = DataBuilder(1, "Data nombre 2", dataSubtype2) | |
| dao.insertInfo(info, listOf(data1, data2)) | |
| } |
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