Mohit Sharma Developer Advocate,MongoDB @codeWithMohit NoSQL database for Mobile Apps WELCOME 

Why NoSQL DB ? DB + NoSQL @codeWithMohit 

How many brave souls here ? Ref: https://www.couchbase.com/blog/wp-content/uploads/2021/05/data-model-sql-to-json.png 

How many lucky? @codeWithMohit 

Response Json is update! @codeWithMohit 

App developers @codeWithMohit 

Repo ? Repo Cache Database Network 

Evolution Repo Cache Database Network API 1 API 2 @codeWithMohit 

Evolution Evilution Repo Cache Database Network API 3.1 API 3.2 API 2.1 API 2.2 API 1.1 API 1.2 API xx API xx API xx API xx API xx API xx API xx API xx 

Occupational Hazard @codeWithMohit 

Do more! @codeWithMohit 

Possible future? @codeWithMohit 

Introspect @codeWithMohit 

Realm MongoDB @codeWithMohit 

Realm Reactive Notifications Built-in Encryption Offline-First, Background Sync Object Schema & Relationships Simple to Learn & Master Idiomatic Query Language 

Realm History ● Free and Open Source Database ● Founded 2011. First release in 2014 ● C++ with Language SDK’s on top ● Part of MongoDB since 2019 By MongoDB 

Realm By MongoDB 

Realm Object Classes are the Schema class Dog : RealmObject { var name: String = "" var age: Int = 0 } class Person : RealmObject { var name: String = "" var dog: Dog? = null var puppies: RealmList = RealmList() } @codeWithMohit 

Relationships class Person : RealmObject { var name: String = "" var dog: Dog? = null var puppies: RealmList = RealmList() var tags: RealmMap = RealmMap() var activities: RealmSet = RealmSet() } @codeWithMohit 

Realm // Minimal configuration val config = RealmConfiguration.with(schema = setOf(Person::class, Dog::class)) // Extended Configuration val config2 = RealmConfiguration.Builder(schema = setOf(Person::class, Dog::class)) .name("my-realm.realm") .deleteRealmIfMigrationNeeded() .build() // Opening a Realm val realm = Realm.open(config) // Closing a Realm (not strictly needed) realm.close() @codeWithMohit 

Realm // Minimal configuration val config = RealmConfiguration.with(schema = setOf(Person::class, Dog::class)) // Extended Configuration val config2 = RealmConfiguration.Builder(schema = setOf(Person::class, Dog::class)) .name("my-realm.realm") .deleteRealmIfMigrationNeeded() .build() // Opening a Realm val realm = Realm.open(config) // Closing a Realm (not strictly needed) realm.close() @codeWithMohit 

Encryption & Schema Migration ● Automatic Migration for basic use-case like Addition or deletion. ● Single call API for encrypting complete database. @codeWithMohit 

Realm // Minimal configuration val config = RealmConfiguration.with(schema = setOf(Person::class, Dog::class)) // Extended Configuration val config2 = RealmConfiguration.Builder(schema = setOf(Person::class, Dog::class)) .name("my-realm.realm") .deleteRealmIfMigrationNeeded() .build() // Opening a Realm val realm = Realm.open(config) // Closing a Realm (not strictly needed) realm.close() @codeWithMohit 

Dependency Injection val koinModule = module { single { RealmConfiguration.with(schema = setOf(Person::class)) } single { Realm.open(get()) } } class MyRepository : KoinComponent { val realm: Realm by inject() } @codeWithMohit 

Queries val id = "my-id" val realm: Realm by inject() val results: RealmResults = realm.query("id = ${id}") @codeWithMohit 

Realm Query Language ● alwaysFalse ● alwaysTrue ● and ● beginGroup ● beginsWith ● between ● contains ● distinct ● endsWith ● endGroup ● equalTo ● greaterThan ● greaterThanOrEqual ● in ● isEmpty ● isNotEmpty ● isNotNull ● isNull ● lessThan ● lessThanOrEqual ● like ● limit ● maximumDate ● minimumDate ● not ● notEqualTo ● or ● sort ● average ● count ● sum ● max ● min @codeWithMohit 

Realm Query langua ge Realm Query language @codeWithMohit 

Listen for & React to changes in data val myPuppy = realm.query("age”, “1").first().find() // Observe Realm Notifications myDog.asFlow().map{ when(it){ is InitialResults -> TODO() is UpdatedResults -> TODO() } } // Update the puppy’s age to see the effect realm.write { myPuppy.age = 3 } @codeWithMohit 

Realm Studio @codeWithMohit 

Half win! 

Half win! 

Atlas Device Sync Out of the box device-cloud synchronization Atlas Database Atlas Device Sync Mobile App @codeWithMohit 

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Sync Conflict Resolution Offline client deletes User1 Driver adds User3 and updates User2’s number t0 t1 Sync Changes t2 Sync Changes t2 Send Merged Changes t4 Send Merged Changes t4 Apply Conflict Resolution Rules t3 Delete Always Wins MongoDB Device Sync Last Update Wins Inserts in lists are ordered by time MongoDB Atlas Realm Sync Client Final State User List |- user0 : 000 |- user2 : 999 |- user3 : 003 Initial State User List |- user0 : 000 |- user1 : 001 |- user2 : 002 

Thatʼs not all ! Out-of-the-box device-cloud synchronization Mobile-optimized database Ultra-lightweight and fast Object-oriented No ORM or DAO required Advanced security and permissions Built-in conflict resolution The leading developer data platform on the cloud Functions Triggers GraphQL DataAPI Data Access Control Atlas Realm Kotlin SDK Atlas Device Sync Search Charts Time Series @codewithMohit 

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Thank you for your time. codeWithMohit