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Basic Custom Class

/**
 * The types are explicity for learning purpose
 */

import { PoolOptions } from 'mysql2/promise';
import { MySQL } from './db.js';

interface User extends RowDataPacket {
  id: number;
  name: string;
}

const access: PoolOptions = {
  host: '',
  user: '',
  password: '',
  database: '',
};

(async () => {
  const mysql = new MySQL(access);

  /** Deleting the `users` table, if it exists */
  await mysql.queryResult('DROP TABLE IF EXISTS `users`;');

  /** Creating a minimal user table */
  await mysql.queryResult(
    'CREATE TABLE `users` (`id` INT(11) AUTO_INCREMENT, `name` VARCHAR(50), PRIMARY KEY (`id`));'
  );

  /** Inserting some users */
  const [inserted] = await mysql.executeResult(
    'INSERT INTO `users`(`name`) VALUES(?), (?), (?), (?);',
    ['Josh', 'John', 'Marie', 'Gween']
  );

  console.log('Inserted:', inserted.affectedRows);

  /** Getting users */
  const [users] = await mysql.queryRows(
    'SELECT * FROM `users` ORDER BY `name` ASC;'
  );

  users.forEach((user: User) => {
    console.log('-----------');
    console.log('id:  ', user.id);
    console.log('name:', user.name);
  });

  await mysql.connection.end();
})();

/** Output
 *
 * Inserted: 4
 * -----------
 * id:   4
 * name: Gween
 * -----------
 * id:   2
 * name: John
 * -----------
 * id:   1
 * name: Josh
 * -----------
 * id:   3
 * name: Marie
 */