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?
Related
Do you know why I can not manually add the value "Sasan" to mySQL server?
MarioDB is installed in PHPStorm and schema is correctly selcted.
const express = require("express");
const app = express();
const bodyParser = require("body-parser");
const mysql = require("mysql");
const cors = require("cors");
const db = mysql.createPool({
host: "localhost",
user: "root",
password: "Test123456",
database: "shoppingList-DB"
});
app.use(cors());
app.use(express.json());
app.use(bodyParser.urlencoded({extended: true}));
app.get("/test", (req, res) => {
const sqlInsert = "INSERT INTO shoppingList (itemList) VALUES ('Sasan')";
db.query(sqlInsert, (error, result) => {
console.log("error", error);
console.log("result", result)
res.send("Hello Express");
})
})
app.listen(5001, () =>{
console.log("Server is up - Port 5001");
})
The error is pretty clear Access denied for user 'root'#'localhost'. Check your credentials and user access in mysql.user table.
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'm trying to query a single line from a 28k record database as a test but it isn't going through but when I load up 'localhost:3001/api/get' it stays loading, even though my connection says success? Is it actually even connecting to the db?
my data bases schema is:
id | state_name | city
const bodyParser = require('body-parser');
const express = require('express');
const app = express();
const mysql = require('mysql');
const cors = require('cors');
const db = mysql.createPool({
host: "localhost",
user: "root",
password: "password",
database: "states_city"
});
app.use(cors());
app.use(express.json());
app.use(bodyParser.urlencoded({extended:true}));
app.get('/api/get', (req, res)=>{
const sqlGet = "SELECT city FROM state_city city = 'Chicago'";
db.query(sqlGet, (err, res)=>{
console.log("success");
});
});
app.listen(3001, ()=>{
console.log("running on port 3001");
});
First you must make server running. Remove that API route you had set before running server.
app.listen(3001, ()=>{
console.log("running on port 3001");
});
Now you must create database connection. Create new file dbconn.js
var mysql = require('mysql');
const db = mysql.createPool({
host: "localhost",
user: "root",
password: "password",
database: "states_city"
});
Now create new connection:
var new_connection = mysql.createPool(
db
);
new_connection.on('connection', function (connection) {
console.log('DB Connection established');
connection.on('error', function (err) {
console.error(new Date(), 'MySQL error', err.code);
});
connection.on('close', function (err) {
console.error(new Date(), 'MySQL close', err);
});
});
// export connection
module.exports = new_connection;
Include that connection in other file:
var db_connection = require('../dbconn');
db_connection.query(query, params, function (error, results, fields) {
//Do your query
});
Read about project structure to make your code easy to edit.
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
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.