82 lines
3.5 KiB
Plaintext
82 lines
3.5 KiB
Plaintext
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# ResultCache implementation rewritten
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The result cache is completely rewritten and now works on the database result level, not inside the ORM AbstractQuery
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anymore. This means that for result cached queries the hydration will now always be performed again, regardless of
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the hydration mode. Affected areas are:
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1. Fixes the problem that entities coming from the result cache were not registered in the UnitOfWork
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leading to problems during EntityManager#flush. Calls to EntityManager#merge are not necessary anymore.
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2. Affects the array hydrator which now includes the overhead of hydration compared to caching the final result.
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The API is backwards compatible however most of the getter methods on the `AbstractQuery` object are now
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deprecated in favor of calling AbstractQuery#getQueryCacheProfile(). This method returns a `Doctrine\DBAL\Cache\QueryCacheProfile`
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instance with access to result cache driver, lifetime and cache key.
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# EntityManager#getPartialReference() creates read-only entity
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Entities returned from EntityManager#getPartialReference() are now marked as read-only if they
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haven't been in the identity map before. This means objects of this kind never lead to changes
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in the UnitOfWork.
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# Fields omitted in a partial DQL query or a native query are never updated
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Fields of an entity that are not returned from a partial DQL Query or native SQL query
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will never be updated through an UPDATE statement.
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# Removed support for onUpdate in @JoinColumn
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The onUpdate foreign key handling makes absolutely no sense in an ORM. Additionally Oracle doesn't even support it. Support for it is removed.
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# Changes in Annotation Handling
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There have been some changes to the annotation handling in Common 2.2 again, that affect how people with old configurations
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from 2.0 have to configure the annotation driver if they don't use `Configuration::newDefaultAnnotationDriver()`:
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// Register the ORM Annotations in the AnnotationRegistry
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AnnotationRegistry::registerFile('path/to/Doctrine/ORM/Mapping/Driver/DoctrineAnnotations.php');
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$reader = new \Doctrine\Common\Annotations\SimpleAnnotationReader();
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$reader->addNamespace('Doctrine\ORM\Mapping');
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$reader = new \Doctrine\Common\Annotations\CachedReader($reader, new ArrayCache());
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$driver = new AnnotationDriver($reader, (array)$paths);
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$config->setMetadataDriverImpl($driver);
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# Scalar mappings can now be ommitted from DQL result
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You are now allowed to mark scalar SELECT expressions as HIDDEN an they are not hydrated anymore.
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Example:
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SELECT u, SUM(a.id) AS HIDDEN numArticles FROM User u LEFT JOIN u.Articles a ORDER BY numArticles DESC HAVING numArticles > 10
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Your result will be a collection of Users, and not an array with key 0 as User object instance and "numArticles" as the number of articles per user
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# Map entities as scalars in DQL result
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When hydrating to array or even a mixed result in object hydrator, previously you had the 0 index holding you entity instance.
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You are now allowed to alias this, providing more flexibility for you code.
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Example:
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SELECT u AS user FROM User u
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Will now return a collection of arrays with index "user" pointing to the User object instance.
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# Performance optimizations
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Thousands of lines were completely reviewed and optimized for best performance.
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Removed redundancy and improved code readability made now internal Doctrine code easier to understand.
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Also, Doctrine 2.2 now is around 10-15% faster than 2.1.
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# EntityManager#find(null)
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Previously EntityManager#find(null) returned null. It now throws an exception.
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