CODEWITHSUNDEEP
node.jstypescriptexpressmysql2
dave withmore
dave withmore

Reputation: 1

mysql2 async/await undefined rows and fields node.js

why this query below returns undefined in rows and field even the user table has data? how can i use the promise version properly in typescript. any help would gladly appreciate. Thank you...

code

import mysql from 'mysql2';
import 'dotenv/config';
import bluebird from 'bluebird';

//? this all configuration for database connection
const connection: any = mysql.createConnection({
  host: process.env.DB_HOSTNAME,
  user: process.env.DB_USER,
  database: process.env.DATABASE,
  Promise: bluebird,
});

//! test connection - required
const testConnection = async () => {
  try {
    //? output to the console the query value
    let [rows, fields]: [any, any] = await connection.execute(
      'SELECT * FROM user',
    );
    console.log(rows, fields);
    console.log('successfully connected to database');
  } catch (error) {
    console.log(error);
  }
};


testConnection();

Console Output
undefined undefined
successfully connected to database

Upvotes: 0

Views: 7532

Answers (1)

Edwin Clement
Edwin Clement

Reputation: 565

Looking at the mysql docs, I have two suggestions:

  • I see that you need to change what you are importing.
  • Also you need to await on the createConnection call as well.
// get the client
const mysql = require('mysql2/promise');
 
// get the promise implementation, we will use bluebird
const bluebird = require('bluebird');
  
const testConnection = async () => {
  try {
    // create the connection, specify bluebird as Promise
    const connection = await mysql.createConnection({host:'localhost', user: 'root', database: 'test', Promise: bluebird});
    // query database
    const [rows, fields] = await connection.execute('SELECT * FROM `table` WHERE `name` = ? AND `age` > ?', ['Morty', 14]);

    console.log(rows, fields);
    console.log('successfully connected to database');
  } catch (error) {
    console.log(error);
  }
};

Upvotes: 3

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