db.js

import firebase from 'firebase';

const config = {
  apiKey: 'AIzaSyB0ztjio3hW5x6UKMUH2fBtAwGdPgkVFC8',
  authDomain: 'test-d3d42.firebaseapp.com',
  databaseURL: 'https://test-d3d42.firebaseio.com',
  projectId: 'test-d3d42',
  storageBucket: 'test-d3d42.appspot.com',
  messagingSenderId: '856945851988',
};
// initialinzing
export const app = firebase.initializeApp(config);

// insert
export const insert = (ref, data) => {
  firebase
    .database()
    .ref(ref)
    .set(data)
    .then(() => {
      console.log('Inserted');
    })
    .catch(error => {
      console.log(error);
    });
};
// Push
export const push = (ref, data) => {
  firebase
    .database()
    .ref(ref)
    .push(data)
    .then(() => {
      console.log('Pushed');
    })
    .catch(error => {
      console.log(error);
    });
};
// select
export const select = ref => {
  firebase
    .database()
    .ref(ref)
    .on('value', data => data.toJSON())
    .then(data => {
      console.log(data);
    });
};
// update
export const update = (ref, data) => {
  firebase
    .database()
    .ref(ref)
    .update(data)
    .then(() => {
      console.log('Updated');
    })
    .catch(error => {
      console.log(error);
    });
};
// delete
export const remove = ref => {
  firebase
    .database()
    .ref(ref)
    .remove()
    .then(() => {
      console.log('Deleted');
    })
    .catch(error => {
      console.log(error);
    });
};