/Java/Update a key in the firebase realtime database java

Update a key in the firebase realtime database java

myRef.orderByChild("name").equalTo("abc").runTransaction(new Transaction.Handler() {
    @Override
    public Transaction.Result doTransaction(MutableData mutableData) {
        Student s = mutableData.getValue(Student.class);
        if (s == null) {
            return Transaction.success(mutableData);
        }

        s.setAge(20);
        // Set value and report transaction success
        mutableData.setValue(s);
        return Transaction.success(mutableData);
    }

    @Override
    public void onComplete(DatabaseError databaseError, boolean b,
                           DataSnapshot dataSnapshot) {
        // Transaction completed
        Log.d(TAG, "postTransaction:onComplete:" + databaseError);
    }
});

Source: stackoverflow.com

Similar codes

1 vote304 views1 answer
Sort array<entry> float android studio
Java
0 vote300 views1 answer
Android studio listview arrayadapter
Java
5 votes272 views1 answer
Insert string in string java
Java
0 vote276 views1 answer
[ERROR] Error executing Maven. java.io.FileNotFoundException: The specified user settings file does not exist: /usr/lib/jvm/java-1.8.0-openjdk-amd64
Java
0 vote324 views1 answer
Leap year java method
Java
0 vote384 views1 answer
Spring boot MVC config
Java Spring
0 vote315 views1 answer
Java show error dialog
Java
1 vote307 views1 answer
Textview set drawable right programmatically
Java
0 vote322 views1 answer
Android maven dependency
Java
0 vote289 views1 answer
Java string vers int
Java