package Ġcom . kat ana . mv vm . data . local Ċ Ċ import Ġandroidx . lifecycle . LiveData Ċ import Ġcom . kat ana . mv vm . model . Student Ċ import Ġio . reactivex . Observable Ċ Ċ /** Ċ Ġ* ĠCreated Ġby ĠK az Ġon Ġ 1 1 : 3 2 Ġ 2 0 1 8 - 1 2 - 1 8 Ċ Ġ*/ Ċ interface ĠDb Helper Ġ{ ĊĊĠĠĠ Ġfun ĠgetAll Student (): ĠLive Data < List < Student >> ĊĊĠĠĠ Ġfun Ġinsert Student ( student : ĠStudent ): ĠObservable < Long > ĊĊĠĠĠ Ġfun Ġdelete Student ( student : ĠStudent ): ĠObservable < Boolean > Ċ }