I'm making a http GET request and will like to load results of API to Mysql db. code is below. My Db connection is working and i'm not getting any errors. I'm just not getting any results loaded into the db. what am I missing?
var request = require('request');
var mysql = require ('mysql');
var express = require ('express')
let config = require ('./config.js')
let connection = mysql.createConnection(config);
var app = express ();
var bodyParser = require('body-parser')
require('dotenv').config()
// start api operation from db
var options = {
'method': 'GET',
'url': 'https://......,
'headers': {
'Cookie': ''
};
request(options, function(error, response) {
if (error) throw new Error(error);
console.log('getting the goods');
});
// end api operation
//start body-parser configuration
app.use(bodyParser.json() ); // to support JSON-encoded bodies
app.use(bodyParser.urlencoded({ // to support URL-encoded bodies
extended: true
}));
//end body-parser configuration
//create app server
var server = app.listen(3000, "127.0.0.1", function () {
var host = server.address().address
var port = server.address().port
console.log("i'm getting your data at http://%s:%s", host, port)
});
// get data from customer api...
var sql = `INSERT INTO dbname
(id, email, created_at, updated_at, first_name, last_name)
VALUES ( '"+rec.body.id+"', '"+email+"', '"+created_at+"', '"+updated_at+"', '"+last_name+"', '"+first_name+"')`;
var dbname = ['"id+"', '"+email+"', '"+created_at+"', '"+updated_at+"', '"+last_name+"', '"+first_name+"']
console.log ("working")
connection.query(sql, [dbname], (err, results, fields) => {
if (err) {
return console.error(err.message);
}
// get insrerted rows
console.log('Row inserted:' + results.affectedRows);
});
// close the database connection
connection.end();
console.log("disconnected")
Related
I am currently working on the API of a React.js project. I have no trouble running SQL requests with databases on MySql servers using Express as long as the SQL request only implies a single database.
My problem: I now have to run an SQL request which implies using data from several databases and I do not know how to do it.
What I currently do in my server.js file to run SQL on a single database:
...
const express = require('express');
const cors = require('cors');
const bodyParser = require('body-parser');
const mysql = require('mysql');
...
let sql = "";
...
// *************************
// CLIENT & DB CONFIGURATION
// *************************
const app = express();
app.use(bodyParser.json()); // to support JSON-encoded bodies
app.use(bodyParser.urlencoded({ // to support URL-encoded bodies
extended: true
}));
var server = app.listen(3001, "127.0.0.1", function () {
var host = server.address().address
var port = server.address().port
console.log("Example app listening at http://%s:%s", host, port)
});
app.use(cors());
const connection = mysql.createConnection({
host : 'myhost.fr',
user : 'someone',
password : 'aZefdt%',
database : 'SuiviTruc',
multipleStatements : true
});
connection.connect(function(err) {
if (err) throw err
console.log('You are now connected with SuiviTruc database...')
});
// **************
// Request sample
// **************
app.get('/SelectAffaire_',(req, res) => {
let sql=`SELECT * FROM t_Affaire_;`
connection.query(sql, (error, result)=> {
if (error) throw error;
res.send(result);
})
})
Thanks for your help!
I'm trying to extract JSON data from /r/askreddit and put it in a mysql database table called "post". The columns in the table are information such as the title of the post, url of the post, and the username of the poster.
I'm at a complete loss at this point on how to bring the data from the raw JSON into my table from the raw JSON, as I thought it should now be working.
Here is my .js server file, any help is appreciated. Thanks.
/*jshint esversion: 6 */
let mysql = require('mysql2');
let dbInfo = require('./dbInfo.js');
let express = require('express');
let bodyParser = require("body-parser");
let app = express();
// Add static route for non-Node.js pages
app.use(express.static('public'));
// Configure body parser for handling post operations
app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json());
app.post('/reddit-import', function (req, res) {
console.log("Route for the /r/askreddit POST");
let sql = for (let i=0; i < x.data.children.length; i++) {
"insert into post (post_title, post_date, post_url, user_name) values (?,?,?,?)"
};
let data = [req.body.post_title, req.body.post_date, req.body.post_url, req.body.user_name];
connection.query(sql,
data,
function (errQuery, result) {
if (errQuery) {
console.log(errQuery);
res.json({status: "Error", err: errQuery});
} else {
console.log("Insert ID: ", result.insertId);
res.json({status: result.insertId, err: ""});
}
}
);
});
// Create database connection
console.log('Creating connection...\n');
let connection = mysql.createConnection({
host: dbInfo.dbHost,
port: dbInfo.dbPort,
user: dbInfo.dbUser,
password: dbInfo.dbPassword,
database: dbInfo.dbDatabase
});
// Connect to database
connection.connect(function(err) {
console.log('Connecting to database...\n');
// Handle any errors
if (err) {
console.log(err);
console.log('Exiting application...\n');
} else {
console.log('Connected to database...\n');
// Listen for connections
// Note: Will terminate with an error if database connection
// is closed
const ip = 'localhost';
const port = 8080;
app.listen(port, ip, function () {
try {
console.log('Alumni server app listening on port ' + port);
} catch (err) {
console.log(err);
}
});
}
});
trying to display data queried from mongo db via nodejs to html index.html.
What the script does? it open the server connection , connect to mongodb and from the webform with datapicker it display the result query, via console i can see the result and it is working perfectly, now i need to display the data to web.
So far no result. Any suggestion?
var express = require("express");
var app = express();
var router = express.Router();
var path = __dirname + '/views/';
var fs = require("fs");
const util = require('util')
//lets require/import the mongodb native drivers.
var mongodb = require('mongodb');
//We need to work with "MongoClient" interface in order to connect to a mongodb server.
var MongoClient = mongodb.MongoClient;
// Connection URL. This is where your mongodb server is running.
var url = 'mongodb://localhost/klevin';
router.use(function (req,res,next) {
console.log("/" + req.method);
next();
});
router.get("/",function(req,res){
res.sendFile(path + "index.html");
var data_e_fillimit = req.param('start_time');
//console.log(params.startDate)
console.log('Data e fillimit '+data_e_fillimit)
var data_e_mbarimit= req.param('endtime_time');
//console.log(params.startDate)
console.log('Data e mbarimit '+data_e_mbarimit)
// Use connect method to connect to the Server
MongoClient.connect(url, function (err, db) {
if (err) {
console.log('Unable to connect to the mongoDB server. Error:', err);
} else {
//HURRAY!! We are connected. :)
console.log('Connection established to', url);
// Get the documents collection
var collection = db.collection('frames');
//We have a cursor now with our find criteria
var cursor = collection.find({
tv: 'tematv',
date_created: {"$gte": new Date(data_e_fillimit) , "$lte": new Date(data_e_mbarimit) }});
//We need to sort by age descending
cursor.sort({_id: -1});
//Limit to max 10 records
cursor.limit(50);
//Skip specified records. 0 for skipping 0 records.
cursor.skip(0);
//Lets iterate on the result
cursor.each(function (err, doc) {
if (err) {
console.log(err);
//res.json(err);
} else {
console.log('Fetched:', doc);
// res.json({ user: 'tobi' })
}
});
}
});
});
/*router.get("/about",function(req,res){
res.sendFile(path + "about.html");
});
router.get("/contact",function(req,res){
res.sendFile(path + "contact.html");
});*/
app.use("/",router);
/*app.use("*",function(req,res){
res.sendFile(path + "404.html");
});*/
app.listen(3000,function(){
console.log("Live at Port 3000");
});
use ejs (npm install ejs --save) package try like this:
app.engine('html', require('ejs').renderFile);
app.set('view engine', 'ejs');
app.get('/', function (req, res){
res.render('index.html',{
foo:bar
});
});
now use can use this object that passed to the index.html
I just started to learn nodejs with express framework.In my app there are two pages app.js and db.js..I need to post data from form and insert to register table
In db.js
var mysql = require('./node_modules/mysql');
var connection = mysql.createConnection({
host: '127.0.0.1',
user: 'root',
password: '',
database: 'nodeapp'
});
connection.connect(function (err) {
if (err)
throw err;
});
module.exports = connection;
// In my app.js page
var express = require('./lib/express');
var app = express();
var bodyParser = require('body-parser')
var db = require('/db');
app.get('/', function (req, res) {
res.sendFile('/NodeProj/views/' + 'index.html');
});
/** bodyParser.urlencoded(options)
* Parses the text as URL encoded data (which is how browsers tend to send form data from regular forms set to POST)
* and exposes the resulting object (containing the keys and values) on req.body
*/
app.use(bodyParser.urlencoded({
extended: true
}));
/**bodyParser.json(options)
* Parses the text as JSON and exposes the resulting object on req.body.
*/
app.use(bodyParser.json());
app.post('/process_form', function (req, res) {
var response = {
"firstname": req.body.fst_name,
"email": req.body.fst_email,
"password": req.body.fst_password
};
var query = connection.query('INSERT INTO register SET?',response,function(err,result){
if(err) throw err;
if(result) console.log(result);
});
res.end(JSON.stringify(response));
});
app.listen(8081);
But when I run the code I got the following error
Refference error: connection is not defined
Please help me .Thanks in advance.
As mentioned in the comments, you've called connection db.
So if you replace var db = require('/db'); with var connection = require('./db'); then your connection will be defined.
In the following code, I am trying to retrieve data from MySQL database and show them to a user by using response write. The error that I got is Error: write after end:
var http = require("http");
var mysql = require('mysql');
var express = require('express');
var app = express();
var bodyParser = require('body-parser');
var urlencodedParser = bodyParser.urlencoded({ extended: false })
app.use(express.static('public'));
app.get('/Search.html', function (req, res) {
res.sendFile( __dirname + "/" + "Search.html" );
})
var connection = mysql.createConnection(
{
host : 'localhost',
user : 'root',
password : 'somepass',
database : 'SocialQuery',
}
);
connection.connect();
app.post('/process_post', urlencodedParser, function (req, res) {
// Prepare output in JSON format
response = {
SearchType:req.body.SearchTypes,
Term:req.body.term
};
//var vas = JSON.stringify(response);
var search = req.body.SearchTypes;
var term = req.body.term;
var query = connection.query('Select * from ?? where Lable = ?', [search, term], function(err, rows) {
res.write(rows);
});
console.log(query.sql);
res.end();
})
//}).listen(8081);
http.createServer(app).listen(8081);
console.log('Server running at http://127.0.0.1:8081/');
I changed res.write(rows); to res.end(rows); but didn't work. Can someone help me solving this problem.
The problem is that MySQL queries are asynchronous in node.js. so, the result won't be in the variable query, but retrieved in the callback, to the variable rows. So what happens is that res.end() is called, and then the callback returns and res.write() is called, so it's called after end().
You are doing an Asynchronous call when fetching data from database. res.write() is inside callback function so before fetching data it would call res.end() and res.write() will be called after the data has been fetched. That's why you are getting Error: write after end . You can use res.end() in the same callback function.
var query = connection.query('Select * from ?? where Lable = ?', [search, term], function(err, rows) {
res.write(rows, function(err){
res.end();
});
});
Now the res.end() function will be called after the write process has been done.
It worked after I made two changes:
var query = connection.query('Select * from ?? where Lable = ?', [search, term], function(err, rows) {
console.log(rows);
res.write(JSON.stringify(rows));
res.end();
});
First, I moved res.end(); inside the connection.query part.
Second, instead of writing rows only, I changed to res.write(JSON.stringify(rows));