Get Started with Cloud Firestore using Kotlin

The basics of cloud firestore using Kotlin Android and how to save, retrieve from the database

Transcript

1. GET STARTED WITH CLOUD FIRESTORE FOR ANDRIOD USING KOTLIN By Nwokocha Wisdom Maduabuchi Android Engineer @Multiskills Ng
2. TABLE OF CONTENT • 1: What Is kotlin • 2: What is Cloud Firestore • 3: How to setup Firestore database using android studio • 4: Understanding Firestore Documents and Collections • 5: How to save and retrieve data to Firestore • 6: Firestore Queries • 7: Hands on coding
3. WHAT IS KOTLIN • Kotlin is a cross-platform, statically typed, general-purpose programming language with type inference. Kotlin is designed to interoperate fully with Java, and the JVM version of its standard library depends on the Java Class Library. • A QUICK CODE SECTION ON KOTLIN USING IntelliJ
4. WHAT IS CLOUD FIRESTORE • Cloud Firestore is a flexible, scalable database for mobile, web, and server development from Firebase and Google Cloud Platform. • Like Firebase Realtime Database, it keeps your data in sync across client apps through Realtime listeners and offers offline support for mobile and web so you can build responsive apps that work regardless of network latency or Internet connectivity. • Cloud Firestore is a cloud-hosted, NoSQL database that your iOS, Android, and web apps can access directly via native SDKs • Firestore is a document/collection database, Documents hold whatever JSON data you'd like, but they must live within a collection. A document can have any number of sub-collections with their own documents.
5. HOW TO SETUP FIRESTORE DATABASE USING ANDROID STUDIO • Step 1: Click on Tools then Firebase • Step 2: Select Firestore • Step 3: Click on “ connect your app to firebase “ • Step 4: Click on “ add cloud firestore to your app “
6. UNDERSTANDING FIRESTORE DOCUMENTS AND COLLECTIONS • Following Cloud Firestore's NoSQL data model, you store data in documents that contain fields mapping to values. These documents are stored in collections, which are containers for your documents that you can use to organize your data and build queries. Documents support many different data types • DATA TYPES SUPPORTED BY FIRESTORE • Text string, Boolean,Numbers,Null, Reference, Integer, Geographical point, Date and time,Map,array,
7. HOW TO SAVE AND RETRIEVE DATA USING FIRESTORE • Add data to Cloud Firestore • There are several ways to write data to Cloud Firestore: Set the data of a document within a collection, explicitly specifying a document identifier. Add a new document to a collection. In this case, Cloud Firestore automatically generates the document identifier. • Get data with Cloud Firestore • There are two ways to retrieve data stored in Cloud Firestore. Either of these methods can be used with documents, collections of documents, or the results of queries: Call a method to get the data. Set a listener to receive data-change events.
8. FIRESTORE QUERIES • Cloud Firestore provides powerful query functionality for specifying which documents you want to retrieve from a collection or collection group. These queries can also be used with either get() or addSnapshotListener() • Simple Queries: WhereEqualto(“Field”,”Value”), whereLessThan(“Field", “Value”), whereGreaterThanOrEqualTo(" Field ", " Value "), OrderBy(“Field”,” Value”) • Compound Queries: WhereEqualto(“Field”,”Value”). WhereEqualto(“Field”,”Value”)
9. HANDS ON CODING Thanks