How to implement mysql2 with promises aync or await - mysql

Question

Ive started learning nodejs/ express and in building a web app I decided to use mysql2. I've been following tutorials on how I get it all working and it all seemed to work fine until I discovered promises. To cut a long story short I've now started to understand the value of promises, however, when I tried to alter my code to accommodate them I did not get the same result.
my previous functions would look like this.
function checkIfLogedIn(req,res,next){
let membershipnumber = req.session.membershipno;
if(req.session.loggedin){
db.query('SELECT * FROM customers WHERE membershipnumber = ?', [membershipnumber], function(error, results, fields) {
if (error) {
response.send('Error connecting to the database '+error);
};
if (results.length > 0) {
req.user = {
name: '${results[0].first_name} ${results[0].last_name}',
membershipnumber: results[0].membershipnumber,
customer_id: results[0].id
}
}
next();
});
}
}
This worked fine. In the attempt to implement promises I first changed my database file
const mysql = require('mysql2');
//const mysql = require('mysql2/promise');
/////////////////////////////////////////////
//local SQL connection
/////////////////////////////////////////////
module.exports = mysql.createConnection({
host : 'localhost',
user : 'root',
password : 'letsgetkinky',//
database : 'nodelogin'
});
Then in my function, i have done this as a test
const db = require('../../database')
async function checkIfLogedIn(req,res,next){
let membershipnumber = req.session.membershipno;
if(req.session.loggedin){
const data = await db.query('SELECT * FROM customers WHERE membershipnumber = 4');
console.log(data);
}
}
This results in an error below
Error: You have tried to call .then(), .catch(), or invoked await on the result of query that is not a promise, which is a programming error. Try calling con.promise().query(), or require('mysql2/promise') instead of 'mysql2' for a promise-compatible version of the query interface.
Im not sure where im going wrong with this, I've tried following the documentation but it doesn't seem to work or be consistent. when i change mysql2/promise it then tells me that the function query does not exist. I would really like to understand where im going wrong on this and how i should be interpreting the documentation as it looks as though there are multiple ways of achieving this.

Answer 1

For posterity, i managed to resolve my own issue. My database file seemed to be causing the issue. Im yet to fully understand why but nevertheless I have managed to achieve using await in my functions. Instead of createConnection which apparently returns a promise I used createPool. With this, I could then do const [fields,rows] = await db.query('SELECT * FROM customers WHERE membershipnumber = 4');
database.js file
const pool = mysql.createPool({
host : 'localhost',
user : 'root',
password : 'letsgetkinky',
database : 'nodelogin'
});
module.exports = pool.promise();