Shortcode in my childtheme is not working

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Reading your question, I think you are calling [get_employee] directly from a PHP template file in your child theme. This is not the way shortcodes work. You have three options:

  1. Put [get_employee] in the content of a post
  2. Run do_shortcode("[get_employee]") wherever you want in a template file
  3. Call directly the function callback wherever you want in your template file

Detail info in the Shortcode API.

Also note that your are using the class $DB and its method RunSelectQueryWithPagination() but there is not initialization before you use it. Also, there no definition for $busCount and $obj, so in the case your shortcode runs correctly I think you won’t get the desire output.