The table data gateway pattern in action

- Table data gateway is common to implement…in any of the major frameworks,…so they make it incredibly easy.…We can spend our time deleting code…instead of writing new.…In this example, I've used composer…to install the zen.dv library.…It's already in the vendor directory,…so you don't have to do anything.…Let's start an index.php.…As you can see, it hasn't changed much.…Instead of using load all and load by id,…we go to a more generic select method for both method calls.…Here and here, but for the second,…we add an additional parameter to get the id that we need.…

Now let's look at our user gateway.…You'll see that beyond the constructor,…which makes the database connection,…it's empty, we don't have any other methods.…How did we get away with that?…Well, Zen's table data gateway…wires all the other logic for us.…Now, if we didn't want to change our code…in the original index.php,…we could wire the class as I have in user2.php.…This allows us to keep the original interfaces,…and preserve backwards compatibility…