In this article you will learn how to quickly get started with JPA. I will be using NetBeans and MySQL database to store data using JPA. If you have MySQL running, all you have to do is follow the steps below.
Anyone that has worked on an enterprise level Drupal application knows that having the transactional consumer data separate from your content will save you time and headaches during a release. With Drupal this is very much possible and it's fairly easy to setup. This can be setup with the DB on a separate server or on the same server where you currently have your Drupal DB residing.
The first thing that you will need to do is edit your "settings.php" file for you drupal installation and add the following array block to configure your second schema:
While using or coding Drupal, if you come across an error to the effect "mysql server has gone away", right in the middle of a request, you may need to do the following.
Find the my.ini file under MySQL server installation directory (mine is under "data" subdirectory), and in the "[mysqld]" section add the following line (or replace the value if it already exists):
max_allowed_packet=16M
Now restart MySQL server and try again. It should work. If it doesn't, try a value higher than 16M.