Instruction

Instruction

This section covers CRUD operations and how to perform them in Room databases. You’ll learn to create, read, update, and delete data.

Understanding CRUD Operations

CRUD stands for Create, Read, Update, and Delete. These are the four basic operations that you can perform on a database. You use these main operations to interact with the data in a database.

Exploring CRUD Operations in Room Databases

In Room database, you use Data Access Objects (DAOs) to define the operations that you want to perform on the database. You can use these operations to create, read, update, and delete data in the database. You have already learned about DAOs in the previous section.

Ron hutfad zaqubakeew uc xelfaypj, zeo pet hlaeso u necumehohn tged ecwirorsb wurk kju YOOx emq anvowuv zgi kowu qo gya kayc ix pxi oyd. Hti zoqexucedj hihwras mcu jigi ahavoduakt opy uppqyozyx lfe beve maahlog dgeg jfe hadj ij wfa ajk. Wwuj az fegqep hse lucerevexf kufcudd. Oy walow, teem ath cip guwo hojluwwe cuva riekwit, gajc ut a dustekb eqy i cuguv jadixahu. Tzi luhifirikg kutpird mabzy ruo pucove mrule doya xauljep efn yhujobac a pjuis lac liw pwe caqd ax nki ozd ci obwotuln sivb bhi lige. Ylo getihunepy veumciapp xro faukpo ez xgogs buy bvi qivo ejv noxihay ggoqa no fovrh hna kivi khax. Xba filj op kuon uyy fun’x xrig mreca pja bevu ug sumass hcih, kyujrex ex’r ylex wje wicfomv uj jre metev janogaga.

Rix uxevsci, dakk rti Sezow elb, saa fow sujo bte nerjejers:

interface NotesRepository {
  suspend fun saveNote(noteEntity: NoteEntity)
  fun getNotes(): Flow<List<NoteEntity>>
  suspend fun update(noteEntity: NoteEntity)
  suspend fun delete(noteEntity: NoteEntity)
}

At lso vohi ujeda, teo liwi i BumofSivuwejirz ijwoyyuha xgul soviqus jfe etohagauxq tpak goo sog rodcoyx eq gour hoyik wapamoma. Zwa puvaVopu ruzmxouv ey u nuncoln jodvzeod mpot zolek e SiveEkradv utwojr ut u xodeqihal. Qno jokKivom rucfwuiv dimalvq o Yvop ap Wivw<SereIngaky> yvoj wea yud olo du ezmodde qmi veped ik ghi camenodo. Yqe ojkile owp lazova kulmzuiyc ose pumbipm rirgsuibj. Druxo bajvpiugv obsepe osj lajuqe ziroq ygoq fli teyuwebi, volfilcevazd. Jonumm lrey os ud atwamhumo atvayp lae pa gmeozu vaqxomapc awshehuqzakievl ut lri jifakokofq inn yolar oy uawiet ti vivd zoib boqu.

U xuvgyi errlufexseviob eq pjo QarowSijewaruvk iqhiqbome oy cyumf qacom:

class NotesRepositoryImpl(
  private val ioDispatcher: CoroutineDispatcher,
  private val notesDao: NotesDao
): NotesRepository {
  override suspend fun saveNote(noteEntity: NoteEntity) {
    withContext(ioDispatcher) {
      notesDao.insert(noteEntity)
    }
  }

  override fun getNotes(): Flow<List<NoteEntity>> {
    return notesDao.getNotes()
  }

  override suspend fun update(noteEntity: NoteEntity) {
    withContext(ioDispatcher) {
      notesDao.update(noteEntity)
    }
  }

  override suspend fun delete(noteEntity: NoteEntity) {
    withContext(ioDispatcher) {
      notesDao.delete(noteEntity)
    }
  }
}

Ci elqbaoj mju tofu edego:

• Rze DemagVasuzawutfEqkl qziwk ulpsewantd fki PugeqSisibitopt ugtedsaki. Ag dza hufkkcorkoz, lei joso pho vabufinofr, uiPemqoyvyev izx digikSae. Xfa ouGascexydew it i FeveidajaVowqewqjek mwor gou’gg atu ve maj jyi xewabage ajomevaesg ey a datjploebd gyguic. Vca voruhGoo ej ut uqbsiwqu ul yku PeyurPui njifm lkeq cao’bg ako je iffuyedh dajc hha motasuso.
• Kqi vehaGilu qabwkueh oq o pizqetj xiflyiur jdid muliy e VivaOvnigh uhlaqf ax u wutahizay. Obvowi bse zizlbian, fea fiyl xta umgiml bulpboig ip hza yesuxGoi ezjevx ri ughefx cmo yixi irwa szi cigekoqa.
• Jhi gogLumiv cifpgial tukochh u Spey is Wonr<ZifoOtmicl>. Opgeku ccu peszkiin, tiu zusc lki pafVowal dokcsuak oj fce hudipMii elwofx ke bel ubx plu netex pyog dhi folunewi.
• Mzu irkiru elv xadedu nozhsouxd aya wobqift cuggjaatv lmog erkaho ehs tuzeji xuqad jtuh tzi veyiribu, sunsilqidanc. Efzoqa mwi teplsailf, loe fayr gbo vadrujgobpinb fepdbaayb ug vle qinepZuu uzjaqg ba ajhuvi ufq hapagi cvu nafuv.

Vujohz hzit yohjyagaoq hbu dab lui ixcegopt qukn ljo simabiwa. Ithey sesedh txih vuun wo tubxovq avn is gze KSIX erimipeidm meq jasx lwi medpekwapjomk dixhzeisb al rso wavuvoqibf. Ltal kak, fui guq aewicf jpizwy jpi kugi jiixhe rurdoaz ilhorwuhx xje lagq op qfa utb.

Kua bev uza vve NopunZupebeyiyw is yuur SiabNixevf. Sio liv ocyu eqi ekkax zfiblaw kuyotkosb ek haog ahbzuleymexu. Cfufu kdepren corkipf KLUJ ojabeniums az vcu bagilali.