How can I apply loop to retrieve the required data from Firebase?

I am trying to get data from the following collection "Buses" if say Bus_Driver=="xyz".

My Firebase test looks like this:

I am getting database reference with this code:

busInfoReference= FirebaseDatabase.getInstance().getReference("Buses");


The following loop I've applied does not work correctly:

for(DataSnapshot ds : dataSnapshot.getChildren())
busInfo = ds.getValue(BusInforamtion.class);
if(ds.exists())
if(busInfo.getBus_Driver().equalsIgnoreCase(driverName))

saveData()

break;
//




How can I apply loop to get the required data? Thanks in advance.

1 Answer
1

To solve this, you need query your database like this:

DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
Query query = rootRef.child("Buses").orderByChild("Bus_Driver").equalsTo("xyz");
ValueEventListener valueEventListener = new ValueEventListener()
@Override
public void onDataChange(DataSnapshot dataSnapshot)
for(DataSnapshot ds : dataSnapshot.getChildren())
String Bus_Driver = ds.child("Bus_Driver").getValue(String.class);
Log.d(TAG, Bus_Driver);



@Override
public void onCancelled(@NonNull DatabaseError databaseError)
Log.d(TAG, databaseError.getMessage());

;
query.addListenerForSingleValueEvent(valueEventListener);


The output in your logcat will contain all bus driver names.

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