B.2 Init Realtime DB

Initialize Firebase Realtime Database

You can initialize the realtime database by calling DB.init(); As soon as you initialized the firebaseDatabase.ane in your project, you will be ready to read and write data to your Firebase database.

NOTE: Make sure you have already initialized the Firebase core before trying any other Firebase child ANEs.

Write to your database

initialize an instance of your database and reference the location you want to write to.

import com.myflashlab.air.extensions.firebase.db.*;

// Write a message to the database
DB.init();
var myRef:DBReference = DB.getReference("message");
myRef.setValue("Hello, World!");

You can save a range of data types to the database this way, including ActionScript Arrays or Objects. When you save an object the responses from any getters will be saved as children of this location.

Read from your database

To make your app data update in realtime, you should add a DBEvents.VALUE_CHANGED listener to the reference you just created.

This event is triggered once when the listener is attached and again every time the data changes, including the children.

// Read from the database
myRef.addEventListener(DBEvents.VALUE_CHANGED, onDataChange);
myRef.addEventListener(DBEvents.VALUE_CHANGE_FAILED, onCancelled);

function onDataChange(e:DBEvents):void
{
	// This method is called once with the initial value and again
	// whenever data at this location is updated.
	if (e.dataSnapshot.exists)
	{
		if (e.dataSnapshot.value is String) 		trace("onValueChanged String value = " + e.dataSnapshot.value);
		else if (e.dataSnapshot.value is Number) 	trace("onValueChanged Number value = " + e.dataSnapshot.value);
		else if (e.dataSnapshot.value is Boolean) 	trace("onValueChanged Boolean value = " + e.dataSnapshot.value);
		else if (e.dataSnapshot.value is Array) 	trace("onValueChanged Array value = " + JSON.stringify(e.dataSnapshot.value));
		else 										trace("onValueChanged Object value = " + JSON.stringify(e.dataSnapshot.value));
	}
}

function onCancelled(e:DBEvents):void
{
	trace("Failed to read value: " + e.msg);
}