app.js

const mysql = require('mysql2/promise');
const config = require('./config.json');

exports.handler = async (event, context) => {

    try {
        let data = await processEvent(event, tables);
        context.succeed(data);
    } catch (e) {
        console.log(e);
        context.done(e);
    }
};

let processEvent = async (event, tables) => {

   // This will create a connection to your database:
   let pool = mysql.createPool({
      host: config.rds_host,
      user: config.name,
      password: config.password,
      waitForConnections: true,
      connectionLimit:10,
      queueLimit:0,
      timezone: '+00:00'
   });

   const result = await getResult(sql, pool);

   return {'Query result': `${result}`}
}
;