Drupal 7.x

HI i'm a D7 I read hundreds of post about the topic of personalize my node--[content type].tpl.php, among them: suggestions, just put the file in your theme, but that's not enough for me, i love to hard code stuffs, in order to deliver to clients just a module folder, nothing else (among other things because i can't know which theme they will use), ..... here comes my question how could I make a replacement in my_module.module file for the node.tpl.php?
I try this already:
my_module_node_view($node, $view_mode){
if ($view_mode == 'full')

I created a node with Php code on it. I am passing parameters for an php program sitting on the server (same one as my drupal instalation).
The results of that php which runs a database query is being displayed as an html outside of my Drupal theme site (same address, but does not inside of the theme I chose).
How do i make it show up in my drupal site?
Thank you,
Alice

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