I am not able to connect to MYSQL with nodejs even though I can access MySQL with Workbench. I am getting the PROTOCOL_ENQUEUE_AFTER_FATAL_ERROR error and I am not able to determine anything wrong with the code here. How should I go about it? Many thanks in advance.
const express = require('express')
const cors = require('cors')
const mysql = require('mysql')
const app = express()
const SELECT_ALL_PRODUCT_QUERY = 'SELECT * FROM products';
const connection = mysql.createConnection({
host:'localhost',
user:'root',
password:'password',
database:'reactdb'
})
app.use(cors())
app.get('/', (req, res) => {
res.send('hello world from the product server')
})
app.get('/productlist', (req, res) => {
connection.query(SELECT_ALL_PRODUCT_QUERY, (err, results) => {
if(err){
return res.send(err)
}
else {
return res.json({
data: results
})
}
})
})
app.listen(4000, () => {
console.log('Product server is listening to port 4000')
})
I managed to solve the connection error by creating a new MySQL user instead of using the root user. Thanks
Related
I’m new to node.js and just tried to follow some tutorial. But I get nothing after I sent this GET request.
I used following code.
const express = require('express');
const app = express();
const mysql = require('mysql');
const db = mysql.createConnection({
user: "root",
host:"localhost",
password:"",
database:"userdb",
});
app.use(express.json());
app.get("/users", (req, res) => {
db.query("SELECT * FROM users", (err, result) => {
res.json(result);
});
});
app.listen(3001, () => console.log('Listening on port 3001...'));
Could anyone please help me with this?
I have created my first app using expo and react native.
My backend is written in node.js (with express and axios) and connected to mysql database. I will be using get, post and put.
What I don't understand is how I move from a development environment to a production environment. In order to connect my API to an external server how do I go about setting up a baseURL which would replace my IP address and port in the below example?
Axios.post("http://53.183.245.150/:19056/location", body).then((response) => {
console.log(response);
}).catch(err => console.log(err))
I have searched online and all examples which they create an API only include running off the local server rather than creating a production app and setting up a remote server.
I would like to link the mobile app to my existing production DB (using mysql) and running off AWS. This DB is connected to my website which is up and running. My backend for my website is written in PHP.
Thank you for any guidance!
I have attached an example of my server as well.
const express = require('express');
const app = express();
const mysql = require('mysql');
const cors = require('cors');
app.use(cors());
app.use(express.json());
const db = mysql.createConnection({
user:'root',
host:'my ip address here',
password:'',
database: 'myDB',
});
app.post('/login', (req, res) => {
const user = req.body.user;
const password = req.body.password;
db.query('SELECT * FROM users WHERE uidUsers = ? AND pwdUsers = ?', [user, password], (error, rows, fields) => {
if (error) console.log(error);
if (rows.length > 0) {
res.send(rows);
} else {
res.send(rows);
}
});
})
app.get('/trips', (req, res) => {
const driver = req.query.driver;
const companyId = req.query.companyId;
const status1 = req.query.status1;
db.query('SELECT * FROM trips WHERE driver = ? AND company_id = ? AND status_1 = ?', [driver, companyId, status1], (error, rows, fields) => {
if(error) console.log(error);
else{
console.log(driver)
res.send(rows);
}
})
});
const PORT = process.env.PORT || 19056;
app.listen(PORT, () => {
console.log(`Listening on port ${PORT}`);
})
strong textI'm trying to create my first CRUD with Mysql, Node js and Express.js following a tutorial.
The problem is, in the video this code works, but in my visual give the error aboyt getConnection is not a function.
If anyones can help, I'll apreciate.
Server.js
const express = require("express");
const mysql = require("mysql");
const myconn = require("express-myconnection");
const routes = require("./routes");
const app = express();
const serverPort = process.env.PORT || 9000;
const dbOptions = {
host: "localhost",
user: "3306",
password: "123456",
database: "catalog",
};
//server running
app.listen(serverPort, () => {
console.log(`App listening at ${serverPort}`);
});
//routes
app.get("/", (req, res) => {
res.send("welcome to my API");
});
app.use("/phones", routes);
Routes.js
const express = require("express");
const routes = express.Router();
const myconn = require("express-myconnection");
routes.get("/", (req, res) => {
req.getConnection((err, conn) => {
if (err) return res.send(err);
conn.query("SELECT * FROM phones", (err, rows) => {
if (err) return res.send(err);
res.json(rows);
});
});
});
module.exports = routes;
UPDATE : solved.
IT WAS A POINT after catalog and I didn't write the port correctly!!!!!
I am creating a simple server application using the following code
const express = require('express');
const mysql = require('mysql');
const PORT = process.env.PORT || 3000;
const app = express();
const connection = mysql.createConnection({
host: 'localhost',
user: 'user',
password: 'password',
database: 'mydata',
});
connection.connect(function (err) {
err ? console.log(err) : console.log(connection);
});
require('./routes/html-routes')(app);
app.listen(PORT, () => {
console.log('app running on port %s', PORT);
});
module.exports = app;
in file server.js
and then a route in file html-routes.js
const mysql = require('mysql');
module.exports = function (app) {
app.get('/', function (req, res) {
connection.query('select * from mydata;', function (err, data) {
err ? res.send(err) : res.json({ mydata: data });
});
});
};
to get data from database
I get the error
ReferenceError: connection is not defined
at /Users/arjunbhandari/Desktop/GL-IT/backend/routes/html-routes.js:5:5
I have struggled for the past 6 hours and cannot understand the problem.
Thanks
As the error states, there is no connection defined (or inherited) within ./routes/html-routes.js.
You still can pass the connection property as a second argument to your exported function:
const mysql = require('mysql');
module.exports = function (app, connection) {
app.get('/', function (req, res) {
connection.query('select * from mydata;', function (err, data) {
err ? res.send(err) : res.json({ mydata: data });
});
});
};
then update the route mounting call within your main server file:
require('./routes/html-routes')(app, connection);
You should review your route implementation logic as this should not be the best design approach to use data-store connections.
I have a React app + Express server deployed on netlify here. I have a simple api endpoint that queries my MySql DB on AWS.
When I make the api request I am given a "Failed to load resource: the server responded with a status of 502".
If I just return a simple
res.send("simple response")
then everything works fine and I get the response on the client. Could someone point me in the right direction on what I should be looking for?
I've tried to disable the skip_name_resolve parameter on my db to see if the hostname mattered, opening up access to all ports / ip's on the aws security group, look up common examples of express + mysql server implementations, lookup the netlify function docs, and using async await in the server.
// client.jsx
useEffect( () => {
fetch("/.netlify/functions/server/api/getSalesData")
.then(res => res.json())
.then(res => console.log(res));
// server.js
const express = require("express");
const bodyParser = require("body-parser");
const serverless = require('serverless-http');
const mysql = require("mysql");
const db = mysql.createConnection({ ... });
db.connect(function(err) {
if (err) throw err;
console.log('You are now connected...')
});
const app = express();
const router = express.Router();
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));
router.get("/api/getSalesData", (req, res) => {
// res.send({ express: "Hello from express" });
db.query("SELECT * FROM Sales LIMIT 5", (err, rows) => {
if (err) throw err;
res.send(rows);
});
});
app.use('/.netlify/functions/server', router);
module.exports = app;
module.exports.handler = serverless(app);