CODEWITHSUNDEEP
androidfirebasefirebase-realtime-database
D.Almeida
D.Almeida

Reputation: 75

Insert data on firebase

I'm starting with programming, and I have questions. First, I can insert data on firebase, but, when I try to insert new data, this data inserted before is changed/updated to new data. How can I insert new data and continue with before data? Second, how can I insert data on firebase together "primary key"? (example in image). "Primary key" highlighted in image Hugs.

Upvotes: 0

Views: 3118

Answers (2)

Alex Mamo
Alex Mamo

Reputation: 138804

A Firebase database is structured as pairs, of key and values. This means that every node in the database is a Map. When you add data to Firebase, think that you are adding data to a Map. As we know, a Map does not allow duplicate keys. This means that if we use the same key, in the case of Map, it replaces the old value with the new one. This means that every time we want to add data, we need a different key. The practice in Firebase is to use the push() method, which provides a unique key every time the method is called.

To add data to your Firebase database, i recomand you using the following code:

DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
DatabaseReference tasksRef = rootRef.child("tasks").push();
tasksRef.setValue(taskObject);

You can also add CompletionListener to actually see if the data was successfully added into the database.

Upvotes: 1

Nick Zisis
Nick Zisis

Reputation: 288

 DatabaseReference mDatabase = FirebaseDatabase.getInstance().getReference();
 mDatabase.child("tasks").push().setValue(firebaseData, new DatabaseReference.CompletionListener() {
        @Override
        public void onComplete(DatabaseError databaseError, DatabaseReference databaseReference) {
            //Problem with saving the data
            if (databaseError != null) {

            } else {
                //Data uploaded successfully on the server

               }

            }
    });

Upvotes: 1

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