Realm Database
Realm Database
Realm is a fast, object-oriented mobile database designed specifically for mobile applications, offering an alternative to SQLite with a simpler, object-based API.
Installing Realm
bash
npm install realm @realm/react
Defining a Schema
javascript
class Task extends Realm.Object {}
Task.schema = {
name: 'Task',
properties: {
_id: 'int',
title: 'string',
isComplete: { type: 'bool', default: false },
},
primaryKey: '_id',
};
Setting Up the Realm Provider
javascript
import { RealmProvider } from '@realm/react';
function App() {
return (
);
}
Writing Data
javascript
realm.write(() => {
realm.create('Task', { _id: 1, title: 'Learn Realm' });
});
Querying Data
javascript
import { useQuery } from '@realm/react';
function TaskList() {
const tasks = useQuery(Task);
return {item.title} } />;
}
Live Updating Queries
Realm queries automatically update the UI whenever underlying data changes, without requiring manual refetching, thanks to its live object system.
Realm vs SQLite
Realm offers a more intuitive, object-oriented API and automatic reactivity compared to SQLite’s traditional SQL-based approach, though SQLite remains valuable for teams already familiar with SQL syntax.
Conclusion
Realm provides a modern, reactive database solution for React Native applications requiring robust local data storage with an intuitive, object-oriented API and automatic UI updates.
