how to add data to the existing database in a firebase realtime database?

how to add data to the existing database in a firebase realtime database?

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how to add data to the existing database in a firebase realtime database?
Tag : android , By : rixtertech
Date : November 28 2020, 04:01 AM

this one helps. This line String key = databaseReference.push().getKey(); creates a new unique reference, that you then write to. If you want to write to an existing reference, you'll need to know the key of that reference, typically by reading it from the UI item that the user clicked on.
Note that calling setValue() replaces all data at the location. If you want to update a subset of the data, or add new properties, you will either have to call setValue() on a lower level, or call updateChildren().
Map<String,Object> values = new HashMap<String,Object>();
values.put("kisiId", kisiId);
values.put("kisiAd", kisiAd);

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Upgrade existing realtime firebase database into Cloud Firestore

Tag : firebase , By : Ben Kohn
Date : March 29 2020, 07:55 AM
Any of those help You can certainly write code to copy your data from one place to another. There is no automated process, since the two databases are designed very differently from each other. You will need to make decisions about how to structure your collections and documents in Firestore, because Realtime Database has no such concepts.

Firebase Realtime Database read all existing data

Tag : android , By : James Dio
Date : March 29 2020, 07:55 AM
This might help you To get all the item that exist in a node at a moment, even if were added before you have restarted your app or after that, you need to attach a listener on that node. Everything in Firebase is about listeners. This means that you are listening for every change that is made in your database at that particular location. So in every moment you can have dataSnapshot of a particular node from your database. So assume we have a database that looks like this:
    --- users
          --- userId1
          |     |
          |     --- //details
          --- userId2
                --- //details
DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
DatabaseReference usersRef = rootRef.child("users");
ValueEventListener eventListener = new ValueEventListener() {
    public void onDataChange(DataSnapshot dataSnapshot) {
        List<String> list = new ArrayList<>();
        for(DataSnapshot ds : dataSnapshot.getChildren()) {
            String userId = ds.getKey();
            Log.d("TAG", userId);
        Log.d("TAG", list);

    public void onCancelled(DatabaseError databaseError) {}

Firebase Realtime Database, can't check the db for existing data and push if not existent

Tag : android , By : liquidx
Date : March 29 2020, 07:55 AM
I wish this help you So i tried implemented it to my existing project and i manage to listen to value existence. Here is my code for reference
public void getMessageThreads() {
    threadRef = database.getReference("Thread")
            .child("Anna Baclayon");
    threadRef.orderByChild("time").equalTo("Mar 02, 2018 09:32:56").addValueEventListener(threadListener);

ValueEventListener threadListener = new ValueEventListener() {
    public void onDataChange(DataSnapshot dataSnapshot) {
        for (DataSnapshot messageThread : dataSnapshot.getChildren()) {
            String time = (String) messageThread.child("time").getValue();

            if(time.contains("Mar 02, 2018 09:32:56")){
                Toast.makeText(getContext(), "Exists", Toast.LENGTH_SHORT).show();
                Toast.makeText(getContext(), "Doesnt Exists", Toast.LENGTH_SHORT).show();

Firebase Realtime Database: Can't send or retrieve data from Firebase Database

Tag : javascript , By : protagonist
Date : November 27 2020, 05:23 PM
I wish this help you You're using a partial import of the Firebase SDK, you need to import the real time database as well as stated in the documentation , and call the function properly (with parenthesis).


    <script src="https://www.gstatic.com/firebasejs/6.3.3/firebase-app.js"></script>
    <!-- import the real time database SDK -->
    <script src="https://www.gstatic.com/firebasejs/6.3.3/firebase-database.js"></script>

        var firebaseConfig = {
            apiKey: "AIzaSyAQqSYXa-TRHGQwx_Cz9mpg2dreT38tq6k",
            authDomain: "miparada-e0e6c.firebaseapp.com",
            databaseURL: "https://miparada-e0e6c.firebaseio.com",
            projectId: "miparada-e0e6c",
            storageBucket: "miparada-e0e6c.appspot.com",
            messagingSenderId: "331834990091",
            appId: "1:331834990091:web:a1a7925f63be5faf"

        function writeData() {
                name: document.getElementById("nameField").value,
                age: document.getElementById("ageField").value


    <h1>User Database</h1>
    <input type="text" placeholder="name" id="nameField">
    <input type="text" placeholder="age" id="ageField">
    <!-- call the function with parenthesis -->
    <button onclick="writeData()">SUBMIT</button>


How to add new attributes to existing data in Firebase Realtime Database?

Tag : java , By : Jesse
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , You'll need to know the key/ID of the trip that you want to add data to. Once you do that, updating the node with the new properties is a matter of:
HashMap<String, Object> values = new HashMap<>();
values.put("phonenumber", "+1-800-555-6789");
values.put("name", "Name of the trip");
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