connect mysql nodejs code example
Example 1: how to manage a db connection in javascript
//put these lines in a seperate file
const mysql = require('mysql2');
const connection = mysql.createPool({
host: "localhost",
user: "",
password: "",
database: ""
// here you can set connection limits and so on
});
module.exports = connection;
//put these on destination page
const connection = require('../util/connection');
async function getAll() {
const sql = "SELECT * FROM tableName";
const [rows] = await connection.promise().query(sql);
return rows;
}
exports.getAll = getAll;
Example 2: use nodejs mysql
var mysql = require('mysql');var connection = mysql.createConnection({ host : 'localhost', user : 'me', password : 'secret', database : 'my_db'}); connection.connect(); connection.query('SELECT 1 + 1 AS solution', function (error, results, fields) { if (error) throw error; console.log('The solution is: ', results[0].solution);}); connection.end();
Example 3: js read mysql database
// Use https://github.com/JackChilds/jsmysqldb
// Then once it's setup you can just do this:
// Config that will be sent to server
const config = {
"table" : "customers",
"limit" : "50",
"offset" : "0"
};
// Use the _POST_REQUEST function to send data to the server and get a response
_POST_REQUEST("link-to-server/database.php", 'config=' + JSON.stringify(config), (response) => {
// Convert the response into an array of rows:
var data = JSON.parse(response);
// Now do what you want with data
// data[row index][column name]
});