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Category: WordPress
Category: WordPress Plugins
Category: WordPressQ:

Delete a Firebase database item if it exists

I am uploading data to a firebase database in the following order:
databaseReference = FirebaseDatabase.getInstance().getReference();
databaseReference = databaseReference.child(“Colleges”);
Map databaseValues = new HashMap();
databaseValues.put(Code, mCode);
databaseValues.put(Name, mName);
databaseValues.put(Description, mDescription);
databaseValues.put(Value, mValue);

This works fine but when it is uploaded, if it already exists it adds a new row but I want to delete the row if it exists. I want to just use the same code I do for adding the data but just be able to delete the data if it exists.
My database is set up like this


If you look at your existing database, you’ll see that the root is a column called “colleges”, which contains a list of the user’s colleges.
This means that deleting the database entry can be done by getting the colleges column, removing the entry and calling setValue on the database reference.
// Get the colleges root node.
DatabaseReference colleges = FirebaseDatabase.getInstance().getReference().child(“colleges”);

// Remove the entry.
ValueEventListener valueEventListener = new ValueEventListener() {
public void onDataChange(DataSnapshot dataSnapshot) {
if (!dataSnapshot.child(Code).exists()) {
// Entry doesn’t exist
} else {
// Entry does exist, so remove it.

public void onCancelled(DatabaseError databaseError) {}
col http://1004kshop.net/wp-content/uploads/2022/06/Access_Developer_Extensions.pdf


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