WordPress oop wpdb in class

I am new in OOP PHP and I am trying to use $wpdb (WORDPRESS) object in some of my custom classes but have no idea how to do it. Every time I try to implement basic operations with $wpdb results in fail.
I need some basic stuff like get_results(),….
So how to do something like this:

global $wpdb;

$my_custom_table = $wpdb->prefix . "table_name";

$table_content = $wpdb->get_results("SELECT * FROM ".$my_custom_table);

and put it into my class like this:

Class MyClass{

     public function table_results(){
            //put in here
            return $this->table_content;

I need that class in separate file so I could easily call to it.

Source: wpdb

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