trackjs / javascript-gameshow

Database - trackjs/javascript-gameshow

Firebase Realtime Database is a cloud-hosted NoSQL real-time database that allows data to be synchronized across clients in real-time. It is part of the Firebase platform, which provides various tools and infrastructure for developing mobile and web applications.

Here are some key features and options of Firebase Realtime Database:

  • Data model: Firebase Realtime Database stores data as JSON trees, with nodes and properties that can be queried and updated in real-time. The data model is schemaless, meaning that you can add, modify, or delete properties and nodes without having to define a schema upfront.
  • SDKs: Firebase Realtime Database provides SDKs for various platforms, including JavaScript, Android, iOS, and C++. The JavaScript SDK can be used in web and Node.js applications.
  • Security rules: Firebase Realtime Database allows you to define security rules that control who can read and write data in the database. The rules can be based on the authenticated user’s ID, the data being accessed, or other conditions.
  • Offline support: Firebase Realtime Database provides offline support for mobile and web applications. The data is cached locally and synchronized with the server when the connection is restored.
  • Scalability: Firebase Realtime Database is designed to scale automatically and handle large amounts of data and traffic. It uses a multi-region data center architecture and provides a 99.99% uptime SLA.

Here are some examples of how to use Firebase Realtime Database in a Node.js application:

  • Setting up the database schema: Firebase Realtime Database does not require a fixed schema, but you can still structure your data in a logical and consistent way. For example, you can create a players node that contains player objects with a username and score property:
{
"players": {
"player1": {
"username": "John",
"score": 100
},
"player2": {
"username": "Jane",
"score": 200
}
}
}
  • Managing database rules and data: Firebase Realtime Database allows you to define security rules that control who can read and write data in the database. For example, you can restrict write access to authenticated users only:
{
"rules": {
".write": "auth != null"
}
}

You can also use database triggers to perform server-side logic when data is added, modified, or deleted. For example, you can update the leaderboard when a player’s score changes:

exports.updateLeaderboard = functions.database.ref('/players/{playerId}')
.onWrite((change, context) => {
const playerId = context.params.playerId;
const playerData = change.after.val();

// Update the leaderboard with the new score
return admin.database().ref('/leaderboard').transaction(leaderboard => {
if (leaderboard) {
leaderboard[playerId] = playerData.score;
leaderboard = orderByValue(leaderboard);
}
return leaderboard;
});
});

For more information, you can refer to the following resources: