Develop Reference

Syntax Error when using multiple parameter substitutions in a MYSQL Query

I need to Update MYSQL data using JS after I receive an AJAX Post request
I made a variable for the MYSQL Update Query and I'm passing in the field to be updated, new value, row to be updated as an array. But for some reason those variables are read with single quotes(') which, I believe, is causing me a syntax error.
var express = require('express');
var app = express();
var bodyParser = require('body-parser');
var MYSQL = require('mysql');
var server = require('http').createServer(app);
//declaring var 'conn' for MYSQL.createPool
let columns = new Array();
// Piece of code Starting the Server
// Routing
app.use(bodyParser.json()); // for parsing application/json
app.use(bodyParser.urlencoded({ extended: true })); // for parsing application/x-www-form-urlencoded
app.use(express.static(path.join(__dirname, 'public')));
app.post('/', function (req, res) {
updateWorkbook(req.body);
res.send('Thanks for the data.');
});
//This is the function extracts the row, field value that need to be updated from the AJAX request
function updateWorkbook( data ){
getcolumns().then( function (columns) {
console.log("Columns got returned to Updateworkbook function")
for (let d = 0; d < data.length; d++) {
let rowToUpdate = data[d].id.replace('row_', '').split('_')[0];
let fieldToUpdate = data[d].id.replace('row_', '').split('_')[1];
let newValue = data[d].value;
console.log('row,field,value: ' + rowToUpdate + '|' + fieldToUpdate + '|' + newValue);
let key_to_replace;
for(let i = 0; i < columns.length; i++) {
let looper = columns[i].toLowerCase()
if (looper === fieldToUpdate) {
key_to_replace = columns[i]
}
}
let field_to_replace = key_to_replace.toString();
console.log(field_to_replace) //It prints out a normal string value here
updatemysql(field_to_replace, newValue, rowToUpdate);
}
});
};
//This is the function which updates MYSQL data
function updatemysql(field, newval, row) {
var sql = "UPDATE mydb.mytable SET ? = ? WHERE ROW_ID = ?;";
conn.getConnection( function (err, connection) {
if (err){
return cb(err);
connection.release();
}
console.log("Connection got established")
conn.query(sql, [field, newval, row], function (error, results){
if (error){
throw error;
connection.release();
}
console.log('Data Updated');
connection.release();
});
});
}
//Function to extract all columns from MYSQL and stores them in an array
function getcolumns() {
return new Promise(function(resolve, reject) {
console.log("getcolumns got initiated")
conn.getConnection( function (err, connection) {
if (err){
return cb(err);
connection.release();
return reject(err);
}
else {
var sql = "SELECT COLUMN_NAME FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA = 'mydb' AND TABLE_NAME = 'mytable';"
conn.query(sql, function (error, results){
for (let i = 0; i < results.length; i++) {
columns.push(results[i]['COLUMN_NAME'])
}
resolve(columns);
console.log("Extracted columns")
connection.release();
});
}
});
});
};
Here's the error I receive:
Error: ER_PARSE_ERROR: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ''Source_of_Phone_Number_' = 'Test' WHERE ROW_ID = '1'' at line 1`
Source_of_Phone_Number_ is the key_to_replace.
Test is the newValue.
1 is the Row_ID.

There is a problem in function updatemysql(), which uses the following SQL :
var sql = "UPDATE mydb.mytable SET ? = ? WHERE ROW_ID = ?;";
You cannot pass a column name as a parameter.
You would need to change this to :
var sql = "UPDATE mydb.mytable SET " + field + " = ? WHERE ROW_ID = ?;";
Accordingly, only two parameters should be passed to the query :
conn.query(sql, [newval, row], function (error, results){ ... });

Searching two tables in one function in DynamoDB

I am trying to link two tables in DynamoDB for an Amazon Alexa skill. I am using two tables one is named 'yesno' and the other 'fixtures'. The fixtures table has a list of 22 names in each record and these names are in the 'yesno' table along with the column 'goals'. Here you can see the tables in more detail. Name Table:
Fixtures Table:
As you can see there are names that link the two databases together. I use the team1 column to search the fixtures table and use the name column to search the name table. Here is my code for searching:
function readDynamoItem(params2, callback) {
var AWS = require('aws-sdk');
AWS.config.update({region: AWSregion});
var dynamodb = new AWS.DynamoDB();
const names = new Array();
console.log('reading item from DynamoDB table');
dynamodb.scan(params2, function (err, data){
if (err) console.log(err, err.stack); // an error occurred
else{
console.log(data); // successful response
//tried to put a automatic loop for the long bit of code after this but didnt work so anyone with insight on this too would be helpful
/*for(var i = 1; i <= 11; i++){
var str = "T1S";
var pos = i.toString();
pos = str.concat(pos);
names[i] = jsonToString(data.Items[0].pos);
}
for(var j = 1; j <= 11; j++){
str = "T2S";
pos = j.toString();
pos = str.concat(pos);
names[(j+11)] = jsonToString(data.Items[0].pos);
}
*/
names[1] = jsonToString(data.Items[0].T1S1);
names[2] = jsonToString(data.Items[0].T1S2);
names[3] = jsonToString(data.Items[0].T1S3);
names[4] = jsonToString(data.Items[0].T1S4);
names[5] = jsonToString(data.Items[0].T1S5);
names[6] = jsonToString(data.Items[0].T1S6);
names[7] = jsonToString(data.Items[0].T1S7);
names[8] = jsonToString(data.Items[0].T1S8);
names[9] = jsonToString(data.Items[0].T1S9);
names[10] = jsonToString(data.Items[0].T1S10);
names[11] = jsonToString(data.Items[0].T1S11);
names[12] = jsonToString(data.Items[0].T2S1);
names[13] = jsonToString(data.Items[0].T2S2);
names[14] = jsonToString(data.Items[0].T2S3);
names[15] = jsonToString(data.Items[0].T2S4);
names[16] = jsonToString(data.Items[0].T2S5);
names[17] = jsonToString(data.Items[0].T2S6);
names[18] = jsonToString(data.Items[0].T2S7);
names[19] = jsonToString(data.Items[0].T2S8);
names[20] = jsonToString(data.Items[0].T2S9);
names[21] = jsonToString(data.Items[0].T2S10);
names[22] = jsonToString(data.Items[0].T2S11);
}
});
var goals = new Array();
//for loop to be used later when expanding
//for(var i = 1; i <= 22; i++){
var params = {
TableName: 'yesno',
FilterExpression: 'name = :value',
ExpressionAttributeValues: {':value': {"S": names[2]}}
};
dynamodb.scan(params, function (err, data) {
if (err) console.log(err, err.stack); // an error occurred
else{
console.log(data); // successful response
var temp = jsonToString(data.Items[0].goals);
goals[1] = temp;
}
callback(goals[1]);
});
//}
}
function jsonToString(str){
str = JSON.stringify(str);
str = str.replace('{\"S\":\"', '');
str = str.replace('\"}', '');
return str;
}
I am trying to use the goals array to print each persons goals off but right now it won't even print one persons and instead will print an undefined object of some sort. I'm guessing it just can't search the names table using the names array. The main bit of code I am having a problem with is when searching the yesno table as you can see in this code:
var goals = new Array();
//for loop to be used later when expanding
//for(var i = 1; i <= 22; i++){
var params = {
TableName: 'yesno',
FilterExpression: 'name = :value',
ExpressionAttributeValues: {':value': {"S": names[2]}}
};
dynamodb.scan(params, function (err, data) {
if (err) console.log(err, err.stack); // an error occurred
else{
console.log(data); // successful response
var temp = jsonToString(data.Items[0].goals);
goals[1] = temp;
}
callback(goals[1]);
});
//}
I know for sure there is nothing wrong with the implementation but here it is just in case it is helpful:
const handlers = {
'LaunchRequest': function () {
this.response.speak('welcome to magic answers. ask me a yes or no question.').listen('try again');
this.emit(':responseReady');
},
'MyIntent': function () {
var MyQuestion = this.event.request.intent.slots.MyQuestion.value;
console.log('MyQuestion : ' + MyQuestion);
const params2 = {
TableName: 'Fixtures',
FilterExpression: 'team1 = :value',
ExpressionAttributeValues: {':value': {"S": MyQuestion.toLowerCase()}}
};
//const params3 = {
// TableName: 'Fixtures',
// FilterExpression: 'team2 = :value',
// ExpressionAttributeValues: {':value': {"S": MyQuestion.toLowerCase()}}
//};
readDynamoItem(params2, myResult=>{
var say = MyQuestion;
say = myResult;
say = 'The top scorer for ' + MyQuestion + ' is ' + myResult;
this.response.speak(say).listen('try again');
this.emit(':responseReady');
});
},
'AMAZON.HelpIntent': function () {
this.response.speak('ask me a yes or no question.').listen('try again');
this.emit(':responseReady');
},
'AMAZON.CancelIntent': function () {
this.response.speak('Goodbye!');
this.emit(':responseReady');
},
'AMAZON.StopIntent': function () {
this.response.speak('Goodbye!');
this.emit(':responseReady');
}
}
;

display Json in html+node.js

I need to display in a html page the results of a GET request to a mysql database which are given in JSON format. I am using express js with bootstrap and I am basically asking how to display the results of a GET request done in node.js in a html page.
This is the code that performs the GET request, tell me if I have to be more clear please
app.route('/zigbee/:action').get(function (req, res) {
var connectionZ = mysql.createConnection({
host : 'localhost',
user : '',
password : '',
database : 'ZigBeeNetwork'
});
connectionZ.connect();
if (req.param('action') == 'zi') {
//route utilizzata per inserire dati, la data è inserita automaticamente tramite la funzione Date()
name = req.param('name');
temp = req.param('temp');
hum = req.param('hum');
date = Date();
if(!name){name = null;}
if(!temp){temp = null;}
if(!hum){hum = null;}
var queryString = 'INSERT INTO ZigBeeTH (id, Arduino, Temp, Hum, Data) VALUES (NULL, "'+name+'", '+temp+', '+hum+', "'+date+'")';
connectionZ.query(queryString, function(err, rows, fields) {
if (err) throw err;
else{
console.log('Query performed');
res.send('Query performed');
}
});
}
if (req.param('action') == 'zs') {
//route per cercare dei dati basandosi su nome e temperatura
name = req.param('name');
temp = req.param('temp');
hum = req.param('hum');
date = Date();
var app='';
if (name) {
app += 'Arduino="'+name+'"';
}
if(temp) {
if(app) {
app+=' AND ';
}
app += 'Temp="'+temp+'"';
}
if(hum){
if(app) {
app+=' AND ';
}
app += 'Hum="'+hum+'"';
}
var queryString = 'SELECT * FROM ZigBeeTH WHERE '+app;
console.log('Test '+queryString );
connectionZ.query(queryString, function(err, rows, fields) {
if (err) throw err;
var JSONObject = JSON.stringify(rows);
res.send(JSONObject);
});
}
});

How to pass parameter between two javascript files in express.js

I am using express js and i want to pass parameter from one javascript file to other. How can I achieve this??
The two files are 1. process.js
var WebPageTest = require('webpagetest');
var wpt = new WebPageTest('server address');
var data_url;
exports.process = function (req, res){
//Running the test
wpt.runTest(script,{runs: 1},function(err, data) {
console.log("<----STARTING TEST---->");
if(err){ console.log(err);}
data_url = data.data.summaryCSV;
console.log('-----------');
console.log(data_url);
console.log('-----------');
});
res.render('index.jade',{par: 'welcome to webpagetest performance, the tests are running in background.'})
};
storedata.js is here
var request = require('request');
var CSV = require('csv-string');
var moment = require('moment');
var process = require('./process.js');
exports.storedata = function(req,res){
var URL;
var loadTime;
var TTFB;
var TTFB1;
var date;
var date1;
var date2;
var db;
console.log(process.process.data_url);
request({uri:process.process.data_url,method:'GET'}, function (error,response,body) {
//console.log('----######----');
//console.log(response.headers);
console.log('----######----');
//console.log(response);
if (error) {
console.log('got an error' + error);
}
//console.log(response);
//console.log(body);
var data = body;
console.log('here is the body');
console.log('----######----');
console.log(body);
CSV.forEach(data, ',', function (row, index) {
if (index == 1 || index == 2) {
URL = row[0];
loadTime = row[1];
TTFB = row[2];
TTFB1 = parseInt(TTFB);
date = new Date(row[59] * 1000);
month = date.getUTCMonth() + 1;
month = month.toString();
var day = date.getUTCDate();
day = day.toString();
var year = date.getUTCFullYear();
year = year.toString();
date = year + "-" + month + "-" + day;
date1 = new Date(date);
date2 = moment(date1).format('YYYY-MM-DD');
//console.log(loadTime);
var app_re = new RegExp(/^https\:\/\/some-url/);
var staging_re = new RegExp(/^https\:\/\/some-url2/);
var webuinqa_re = new RegExp(/^https\:\/\/some-url3/);
// Writting into the databse for some-url
if(app_re.test(URL)){
var db = req.db;
var collection = db.get('app');
collection.insert({
"Date": date2,
"TTFB": TTFB1,
"loadTime": loadTime,
"Url": URL
}, function (err, doc) {
if (err) {
res.send("There was a problem adding the information to the database.");
}
});}
//Writting into the database for some-url2
if(staging_re.test(URL)){
var db = req.db;
var collection = db.get('staging');
collection.insert({
"Date": date2,
"TTFB": TTFB1,
"loadTime": loadTime,
"Url": URL
}, function (err, doc) {
if (err) {
res.send("There was a problem adding the information to the database.");
}
});}
//Writting into the database for some-url3
if(webuinqa_re.test(URL)){
var db = req.db;
var collection = db.get('webuinqa');
collection.insert({
"Date": date2,
"TTFB": TTFB1,
"loadTime": loadTime,
"Url": URL
}, function (err, doc) {
if (err) {
res.send("There was a problem adding the information to the database.");
}
});}
res.render('index', {title: "All the test Results have been added to the databases, Go to localhost/getData to get the graph"});
//res.redirect('/getData');
}
});
});
};
I want to pass parameter data_url in process.js file to storedata.js file so. I will use the value of data_url in method request in storedata.js.

You could try something like this:
In your storedata.js
module.exports = function(data_url) {
// ...
}
In process.js:
var request = require('request');
var CSV = require('csv-string');
var moment = require('moment');
// The path like this assumes storedata.js and process.js
// are in the same folder.
var storeData = require('./storedata');
exports.process = function (req, res){
var URL;
var loadTime;
var TTFB;
var TTFB1;
var date;
var date1;
var date2;
var db;
var data_url;
// initiating the test
var WebPageTest = require('webpagetest');
var wpt = new WebPageTest('server-address');
//Running the test
wpt.runTest(script,function(err, data) {
//console.log("hello -->",err || data);
data_url = data.data.summaryCSV;
console.log('-----------');
console.log(data_url);
console.log('-----------');
// Once your data_url is ready
storeData(data_url);
UPDATE:
Based on your comments, here is a possible solution.
var WebPageTest = require('webpagetest');
var wpt = new WebPageTest('server address');
var data_url;
exports.process = function (req, res){
//Running the test
wpt.runTest(script,{runs: 1},function(err, data) {
console.log("<----STARTING TEST---->");
if(err){ console.log(err);}
data_url = data.data.summaryCSV;
console.log('-----------');
console.log(data_url);
console.log('-----------');
});
res.render('index.jade',{par: 'welcome to webpagetest performance, the tests are running in background.'})
};
// Create another method that is able to return the saved data.
exports.getSavedDataURL = function() { return data_url; }
Then in storedata.js
exports.storedata = function(req,res){
var URL;
var loadTime;
var TTFB;
var TTFB1;
var date;
var date1;
var date2;
var db;
//
var url = process.getSavedDataURL();
request({uri:url,method:'GET'}, function (error,response,body) {

Node.js loading Postgres SQL data into JS FIle

I'm attempting to load the Postgres data into node.js and I'm having a lot of difficulty with it. I know the constring works because I used it to send the data from the a textfile into the database.
var request = require('request');
var pg = require('pg');
var squel=require('squel');
var client = new pg.Client(conString);
var conString="postgres://postgres:Password#localhost:5433/postgres"
client.connect(function (err,data){
if(err) console.log("Error connecting to PG", err);
else{
var query = squel.select().from('"ASNTable"')
console.log(query.toString());
client.query(query, function(res){
var outputJSON = [];
for (row in res){
outputJSON.push(row);
}
return outputJSON
console.log(outputJSON)
});
}
});
I keep getting "SELECT * FROM "ASNTable" so its like the client.query part never does anything?

#aembke I figured it out.
The var conString should go before client.
var request = require('request');
var pg = require('pg');
var squel=require('squel');
var conString="postgres://postgres:Vcu3student#localhost:5433/postgres"
var client = new pg.Client(conString);
var outputJSON = [];
client.connect(function (err,data){
if(err) console.log("'Error connecting to PG'", err);
else{
var query = squel.select().field("asnumber").from('"asntable"');
client.query(query.toString(), function (err,res){
if (err) throw err;
var x = JSON.stringify(res);
var y = x.split(",")
// console.log(y[7])
console.log(y.length);
for (var i=0; i<y.length; i++){
// console.log(y[i]);
if (y[i].indexOf('"asnumber":') > 0)
{
console.log(y[i])
outputJSON.push(y[i]);
}
};
// console.log("result "+JSON.stringify(res))
});
}
});
console.log(outputJSON);