Create custom database provider without ORM

[finzaiko]

Hi Ariel,
Thanks for your great Udemy tutorial really easy to understand,
How can I create custom database provider without using TypeORM, pure raw sql command.
I try to follow this but not really understand to start create the provider
I can do something like this in my service:

pool = new Pool(dbConfig);
  getAll(): any {
    return this.pool.query(`SELECT * FROM todo`);
  }

but how to create a simple datatable module handle ?
or could you update your Udemy course
Thanks.