Writing Data to Firebase Realtime Database

Writing Simple Data

To write data to Firebase Realtime Database, use the set method. Here’s an example of writing user data to the database:

function writeUserData(userId, name, email) {
  firebase.database().ref('users/' + userId).set({
    username: name,
    email: email
  });
}

// Example usage
writeUserData('1', 'John Doe', 'john.doe@example.com');

Explanation: The `writeUserData` function writes user data to the Firebase Realtime Database by creating or updating a user entry with the given `userId`, `name`, and `email` under the path `users/userId`. For example, calling `writeUserData(‘1’, ‘John Doe’, ‘john.doe@example.com’)` will store the username and email for the user with ID ‘1’.

Writing Data with Push

If we want Firebase to generate a unique key for each new child, use the push method. This is useful for lists of data, like messages or tasks.

function addMessage(userId, message) {
  const messageRef = firebase.database().ref('messages/').push();
  messageRef.set({
    userId: userId,
    message: message
  });
}

// Example usage
addMessage('1', 'Hello, World!');

Output Example

After running the above code, our database structure will look like this:

{
  "users": {
    "1": {
      "username": "John Doe",
      "email": "john.doe@example.com"
    }
  },
  "messages": {
    "-Mabcd1234": {
      "userId": "1",
      "message": "Hello, World!"
    }
  }
}

Explanation:The `addMessage` function adds a new message to the Firebase Realtime Database by generating a unique key for each message and storing the `userId` and `message` under the path `messages/`. For example, calling `addMessage(‘1’, ‘Hello, World!’)` will add a new message from user ‘1’ with the content ‘Hello, World!’.

Firebase Realtime Database, a cloud-hosted NoSQL database developed by Google, provides a robust solution for achieving seamless real-time data updates across connected clients.

In this article, We will learn about the Firebase Realtime Database, How to Setting Up the Firebase Realtime Database, write data or read data to Firebase Realtime Database with an example of a Real-Time Simple Chat Application.