Take the pain out of dealing with relational databases in an object-oriented programming world. With this short book, you can save time and money by simply coding less while accomplishing more with the Doctrine persistence framework, a leading persistence solution for PHP programmers and web developers. PHP Persistence teaches you about PHP persistence and how to use it effectively for your database-driven applications. Bestselling author Michael Romer leverages his own vast experience to show you what you need to know about Doctrine 2 and how to use it in your own projects. Along the way, you'll learn about powerful persistence techniques, such as object-relational mapping (ORM) in PHP. What you'll learn includes defining entities and references between entities, managing entities, mastering the Doctrine Query Language, using appropriate command-line tools for PHP persistence, and programming for caching.