webmcq/database.js at master · SreejithNS/webmcq · GitHub

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//////////////// SQlite3 integration for Database Management ////////////////////////

const EventEmitter = require('events');

var sqlite3 = require('sqlite3');

///// DB connection /////

let db = new sqlite3.Database('db/quest.db');


 exports.qset= new EventEmitter();


exports.qset.on('req',function(req) {
	let sql = "SELECT * FROM '" + req + "' ";

	var result;

	db.all(sql, [], (err, row) => {
  	if (err) {
    return false,console.error(err.message);
  	}

  //console.log(row);

 	 exports.qset.emit('res',row);
	});

});

exports.qset.on('rep',function(rep){
	var roll = rep.roll, name = rep.nam, sys = rep.sys, mis = rep.mistake , totmis = rep.totmistake, total = rep.total;

	let sql = "INSERT INTO '12sqset1_report' ( roll , name , sys , mistakes , totalmistakes , total ) VALUES (" + roll + ",' "+ name +"',"+ sys +",'"+ mis+"',"+ totmis +","+ total  +")";


	db.run(sql, [], (err) => {
  	if (err) {
    return false,console.error(err.message);
  	}
  	exports.qset.emit('rep_suc');
});
});

exports.requestReports = function(name) {

	let sql = "SELECT * FROM '" + name + "_report'";

	db.all(sql, [], (err,res) => {
  	if (err) {
    return false,console.error(err.message);
  	}
  	let data = JSON.stringify(res);
  	exports.qset.emit('report_data',data);
});
};

exports.requestQuestions = function(name){

	let sql = "SELECT * FROM '" + name + "'";

	db.all(sql, [], (err,res) => {
  	if (err) {
    return false,console.error(err.message);
  	}

  	let data = JSON.stringify(res);
  	exports.qset.emit('questions_data',data);
});
};

exports.insertQuestion = function(rdata,table){
	var data = JSON.parse(rdata);

	let sql = "INSERT INTO '"+ table +"' (`quest`,`opt1`,`opt2`,`opt3`,`opt4`,`ans`) VALUES ('"+ data.quest +"', '"+ data.opt1 +"', '"+data.opt2 +"', '"+data.opt3 +"', '"+data.opt4 +"', "+ parseInt(data.ans) +")";

	db.run(sql,[],(err)=>{
		console.log(err);
		return
	});
	console.log("insert_questions inserted into"+table);

	exports.requestQuestions(table);
};
exports.editQuestion = function(rdata,table){
	var data = JSON.parse(rdata);

	//let sql = "INSERT INTO '"+ table +"' (`quest`,`opt1`,`opt2`,`opt3`,`opt4`,`ans`) VALUES ('"+ data.quest +"', '"+ data.opt1 +"', '"+data.opt2 +"', '"+data.opt3 +"', '"+data.opt4 +"', "+ parseInt(data.ans) +")";
	let sql = "UPDATE '"+table+"' SET quest='"+data.quest+"',opt1='"+data.opt1+"',opt2='"+data.opt2+"',opt3='"+data.opt3+"',opt4='"+data.opt4+"',ans='"+data.ans+"' WHERE qno='"+data.qno+"';"
	db.run(sql,[],(err)=>{
		console.log(err);
		return
	});
	console.log("edit_questions edit on "+data.qno+"@"+table);

	exports.requestQuestions(table);
};


exports.qcode = (name,author,subject,clas) =>{

	var sql = "CREATE TABLE IF NOT EXISTS '"+ name +"' ( qno INTEGER PRIMARY KEY AUTOINCREMENT, quest TEXT, opt1 TEXT, opt2 TEXT, opt3 TEXT, opt4 TEXT, ans integer )";
	db.run(sql,[],(err)=>{
		if(err) console.log(err);
		return
	});

	sql = "CREATE TABLE IF NOT EXISTS'"+ name +"_report' ( roll INTEGER PRIMARY KEY, name text, sys integer, mistakes text, totalmistakes integer, total integer )";
	db.run(sql,[],(err)=>{
		if(err) console.log(err);
		return
	});

	if(author|| subject || clas){
	sql = `INSERT INTO 'questions' ('qcode','author','subject','class') VALUES (${qcode},${author},${subject},${clas})`;

	db.run(sql,[],(err)=>{
		if(err) console.log(err);
		return
	});
	exports.listQpapers();
	}
};

//////////////////// QUESTIONS MANAGER ///////////////////

exports.listQpapers = ()=>{
	let sql = "SELECT * FROM 'questions'";

	db.all(sql, [], (err,res) => {
  	if (err) {
    return console.error(err.message);
  	}

  	let data = JSON.stringify(res);
  	exports.qset.emit('listQpapers',data);
});
}

//////////////////////// USER ACCOUNTS ////////////////////

exports.addUser = (uname,pass,fname,type)=>{
	let sql = `INSERT INTO 'users' ('username','password','fullname','type') VALUES (${uname},${pass},${fname},${parseInt(type)})`;

	db.run(sql,[],(err)=>{
		if(err) console.log(err);
		return
	});

	exports.listUsers();
};

exports.listUsers = ()=>{

	let sql = `SELECT * FROM 'users'`;

	db.all(sql, [], (err,res) => {
	  	if (err) {
	    	return console.error(err.message);
	  	}

	  	let data = JSON.stringify(res);
		exports.qset.emit('listUsers',data);
	});
}