Mariadb-Developer-Examples/Flights/src/db.js

var mariadb = require('mariadb');
require('dotenv').config();

const pool = mariadb.createPool({
  host: process.env.DB_HOST, 
  user: process.env.DB_USER, 
  password: process.env.DB_PASS,
  port: process.env.DB_PORT,
  database: process.env.DB_NAME,
  multipleStatements: true,
  connectionLimit: 5
});

module.exports={
    getConnection: function(){
      return new Promise(function(resolve,reject){
        pool.getConnection().then(function(connection){
          resolve(connection);
        }).catch(function(error){
          reject(error);
        });
      });
    }
  }