callback_hell.js

var sqlite3 = require('sqlite3').verbose();


var get_rows = function(query, callback){
	var db = new sqlite3.Database('test.db');
	db.serialize(function(){
		db.all(query, function(err, rows){
			callback(rows);
		});
	});
}

 var get_all = function(callback){
 	var results = [];
 	var queries = ["SELECT * FROM users;", "SELECT * FROM staff;"];
 	
	get_rows(queries[0], function(rs){
		results.push(rs);
		get_rows(queries[1], function(rs){
			results.push(rs);
			callback(results);
		});
	});
	
 }


get_all(function(data){
 	console.log(data);
});