js how to engage in this

javascript how to connect oracle database and CRUD, with detailed code on the code
recently to be a small thing , there are some small data dictionary field I used this way
------ Solution ------------------ --------------------------
if you want to use to connect to the js on the page , it should not, but if a local developer should be able to use nodejs
------ Solution ---------------------------------------- ----
via ajax to the background ? Then how to get all over you
------ Solution --------------------------------- -----------
js? ? Directly connected to the database ? Want more of it . node.js possible, did not go in-depth study .
------ For reference only -------------------------------------- -
Why do it . Reception can not see js / ? Is encrypted can be cracked.