Input multiple data into Realtime Database of Firebase

Explanation of adding unique key and how to add multiple data without updatingexisting data.

if database reference child is fixed string, new value will not add. just it will update the previous value. for example :

DatabaseReference myRef = FirebaseDatabase.getInstance().getReference();
String mText = // get data from editText or set your own custom data

now if I insert data like this:

myRef.child("abc").child("cba").setValue(mText);

every time I insert data it will update my previous data. It will not add new data. Because my reference is fixed here(myRef.child("abc").child("cba") // this one, which is always fixed).

Now change the the value of child "cba" to a random or dynamic value which will not fix. For example:

Random rand = new Random();
// Obtain a number between [0 - 49].
int n = rand.nextInt(50);
myRef.child("abc").child(String.valueOf(n)).setValue(mText);


In this case it will add a new value instead of updating. because this time reference is not fixed here. it is dynamic. push() method exactly do the same thing. it generates random key to maintain unique reference.



A reference link for CRUD operation in Realtime Database : Firebase CRUD

An Android project with CRUD operation example : Project Link