#FB_QUERYEXCEL

Fast, optimal package to query data from firebase into a csv format for download using node.

var fbqueryexcel = require('fb_queryexcel');
var firebase = require('firebase');
const express = require('express');
const app = new express();

var config = {
    "databaseURL": "https://yourdatabaseurl.firebaseio.com/",
  };

firebase.initializeApp(config);
var ref = firebase.database().ref("urlstring");

app.get('/', function (req, res) {
    fbqueryexcel.convert(ref,attrib,seaparam,res);
  
})

Installation

This is a Node.js module available through the npm registry.

Before installing, download and install Node.js. Node.js 0.10 or higher is required.

Installation is done using the npm install command:

$ npm install fb_queryexcel

Features

• Query data from Firebase Database
• Data sent as a download attachment in CSV format(excel)
• Validates search,query parameters

Function Parameters

convert(ref, attrib, seaparam, response)

1. ref => Firebase Database Reference

2. attrib =>

   • '*' => all attributes
   • ['-',att1,att2,...] => all attributes except att1,att2 and so on
   • [att1,att2,...] => attributes att1,att2 and so on are selected

3. seaparam =>

   • [[attrib,operator,limit1,limit2]]
   • attrib is the name of the attribute for which condition is specified
   • operator can be >,<,>=,<=,==,!=
   • limit1 is the object to be compared with
   • if operator is <>, then limit1> obj >limit2

4. response =>

   • response object generated by express framework

##Examples

//example to get complete data as a csv(excel) file
app.get('/', function (req, res) {
    attrib = '*'
    seaparam = []
    fbqueryexcel.convert(ref,attrib,seaparam,res);
})

//example to query data with few attributes removed and a constraint on one parameter(let's say num)
app.get('/', function(req, res)
{
  attrib = ['-','phonenum','email']//we dont want phonenum and email attributes
  seaparam = [['rank','<>',2,10]]
  fbqueryexcel.convert(ref,attrib,seaparam,res);
//returns objects with rank between 2 and 10 with phonenum and email attributes removed
})

//example to query few attributes and constraints on 3 parameters
app.get('/', function(req, res)
{
  attrib = ['name','rollno','rank','college']
  seaparam = [['rank','>=',5], ['college','==','ABC'], ['name','!=','xyz']]
  fbqueryexcel.convert(ref,attrib,seaparam,res);
})