title: Checking if mysql user exists
body: <p>How can I check if a user exists?</p>
  
  <p>Im doing an installer for a mysql database, and I need to check if a user exits, if not create user, if yes delete user and create it again.</p>
  
  <p>this so i can execute the script without worries.</p>
  
  <p>thanks.</p>