Database MySQL knex

Hi.
Y need Knex with Oracle or Mysql
I execute “yarm install mysql -save” or “mpn install mysql -save” but yarn o npm not found.
I Install from Executable, not form sourde, the knex is ok, the log say "

errorAn error occurred while executing the action "UserDBUtilityMySQL [Error, Knex: run
$ npm install mysql --save
Cannot find module ‘mysql’

i need install the extension, and How to Install?.
Can yours help me?
Thanks
Joe.

@joseo Please have a look at the below tutorial

Hi.
Tanks for your repply.
I develp from tar.gz.
and the yarn not work,
Can you tell me how implement fron source?
The use of Knex is ok.
Just need support for mysql and oracle.
Tanks.
Joe