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Chapter 23: Caching 326

Chapter 23: Caching 326 // ... $manager->setAttribute(Doctrine_Core::ATTR_RESULT_CACHE_LIFESPAN, 3600); Now as we have set a cache driver for use we can make a DQL query use it by calling the useResultCache() method: Fetch blog post titles and the number of comments: Listing 23-11 $q = Doctrine_Query::create() ->select('b.title, COUNT(c.id) count') ->from('BlogPost b') ->leftJoin('b.Comments c') ->limit(10) ->useResultCache(true); $blogPosts = $q->execute(); Fine Tuning In the previous chapter we used global caching attributes. These attributes can be overriden at the query level. You can override the cache driver by calling useCache() and pass it an instance of a valid Doctrine cache driver. Listing 23-12 $q = Doctrine_Query::create() ->useResultCache(new Doctrine_Cache_Apc()); Also you can override the lifespan attribute by calling setResultCacheLifeSpan(): Listing 23-13 $q = Doctrine_Query::create() ->setResultCacheLifeSpan(60 * 30); Conclusion Using the caching feature of Doctrine is highly recommended in both development and production environments. There are no adverse affects to using it and it will only help the performance of your application. The caching feature is the second to last feature we will discuss in this book before wrapping things up by discussing things like the technologies used (page 368) in Doctrine, coding standards (page 381) and unit testing (page 356). Lets move on to discuss the last feature of Doctrine, Migrations (page 327). ----------------- Brought to you by

Chapter 24: Migrations 327 Chapter 24 Migrations The Doctrine migration package allows you to easily update your production databases through a nice programmatic interface. The changes are done in a way so that your database is versioned and you can walk backwards and forwards through the database versions. Performing Migrations Before we learn how to create the migration classes lets take a look at how we can run migrations so that we can implement them in our Doctrine test environment in the next section. First lets create a new instance of Doctrine_Migration and pass it the path to our migration classes: $migration = new Doctrine_Migration('/path/to/migration_classes', $conn); Listing 24-1 Notice the second argument to the Doctrine_Migration constructor. You can pass an optional Doctrine_Connection instance. If you do not pass the connection for the migration class to use, it will simply grab the current connection. Now we can migrate to the latest version by calling the migrate() method: $migration->migrate(); Listing 24-2 If you want to migrate to a specific version you can pass an argument to migrate(). For example we can migrate to version 3 from 0: $migration->migrate(3); Listing 24-3 Now you can migrate back to version 0 from 3: $migration->migrate(0); Listing 24-4 If you want to get the current version of the database you can use the getCurrentVersion() method: echo $migration->getCurrentVersion(); Listing 24-5 ----------------- Brought to you by

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