Caching — Doctrine 1.2.4 documentation. Introduction Doctrine provides means for caching the results of the DQL parsing process, as well as the end results of DQL queries (the data). These two caching mechanisms can greatly increase performance. Consider the standard workflow of DQL query execution: Init new DQL queryParse DQL queryBuild database specific SQL queryExecute the SQL queryBuild the result setReturn the result set Now these phases can be very time consuming, especially phase 4 which sends the query to your database server.
When Doctrine query cache is being used only the following phases occur: Init new DQL queryExecute the SQL query (grabbed from the cache)Build the result setReturn the result set If a DQL query has a valid cache entry the cached SQL query is used, otherwise the phases 2-3 are executed normally and the result of these steps is then stored in the cache. Note You should always use query cache in a production environment. When using a result cache things get even better. Query Cache Using the Query Cache. Databases and Doctrine. One of the most common and challenging tasks for any application involves persisting and reading information to and from a database. Although the Symfony full-stack framework doesn't integrate any ORM by default, the Symfony Standard Edition, which is the most widely used distribution, comes integrated with Doctrine, a library whose sole goal is to give you powerful tools to make this easy.
In this chapter, you'll learn the basic philosophy behind Doctrine and see how easy working with a database can be. A Simple Example: A Product The easiest way to understand how Doctrine works is to see it in action. Configuring the Database Before you really begin, you'll need to configure your database connection information. Note Defining the configuration via parameters.yml is just a convention.
By separating the database information into a separate file, you can easily keep different versions of the file on each server. Creating an Entity Class Tip Add Mapping Information AnnotationsYAMLXML Caution. 5. Association Mapping — Doctrine 2 ORM 2.2 documentation. This chapter explains mapping associations between objects. Instead of working with foreign keys in your code, you will always work with references to objects instead and Doctrine will convert those references to foreign keys internally.
A reference to a single object is represented by a foreign key.A collection of objects is represented by many foreign keys pointing to the object holding the collection This chapter is split into three different sections. A list of all the possible association mapping use-cases is given.Mapping Defaults are explained that simplify the use-case examples.Collections are introduced that contain entities in associations. To gain a full understanding of associations you should also read about owning and inverse sides of associations 6.1. A many-to-one association is the most common association between objects.
PHP<? Note The above @JoinColumn is optional as it would default to address_id and id anyways. Generated MySQL Schema: 6.2. PHP<? 6.3. PHP<? 6.4. <? 6.5. PHP<? 21. Annotations Reference — Doctrine 2 ORM 2.2 documentation. You’ve probably used docblock annotations in some form already, most likely to provide documentation metadata for a tool like PHPDocumentor (@author, @link, ...). Docblock annotations are a tool to embed metadata inside the documentation section which can then be processed by some tool. Doctrine 2 generalizes the concept of docblock annotations so that they can be used for any kind of metadata and so that it is easy to define new docblock annotations. In order to allow more involved annotation values and to reduce the chances of clashes with other docblock annotations, the Doctrine 2 docblock annotations feature an alternative syntax that is heavily inspired by the Annotation syntax introduced in Java 5.
The implementation of these enhanced docblock annotations is located in the Doctrine\Common\Annotations namespace and therefore part of the Common package. Doctrine 2 docblock annotations support namespaces and nested annotations among other things. 22.2.1. Required attributes: Examples: 11. Association Updates: Owning Side and Inverse Side — Doctrine 2 ORM 2.2 documentation. When mapping bidirectional associations it is important to understand the concept of the owning and inverse sides. The following general rules apply: Relationships may be bidirectional or unidirectional.A bidirectional relationship has both an owning side and an inverse sideA unidirectional relationship only has an owning side.Doctrine will only check the owning side of an association for changes. 12.1.
Bidirectional Associations The following rules apply to bidirectional associations: The inverse side has to use the mappedBy attribute of the OneToOne, OneToMany, or ManyToMany mapping declaration. The mappedBy attribute contains the name of the association-field on the owning side.The owning side has to use the inversedBy attribute of the OneToOne, ManyToOne, or ManyToMany mapping declaration. 12.2. Doctrine will only check the owning side of an association for changes. To fully understand this, remember how bidirectional associations are maintained in the object world.
Note. How To Add A Custom Id Generation Strategy To Doctrine 2.1 « Ransford Okpoti's Blog. Object-Relational Mapping (ORM) has caught up with PHP. In case you have been living under a rock, here’s the list of the popular ORM solutions in PHP: With the advent of Doctrine 2.0.0 (which at the time of writing this article is at Beta 2), which requires a minimum of PHP version 5.3, our domain objects (models) are now free from subclassing a mandatory superclass as imposed by its predecessors (previous versions before 2.0.0).
Below is a code snippet of a User model as would be implemented in earlier versions of Doctrine before version 2.0.0. The 2.0 version is totally different in that it now resembles the popular ORM solution in Java, Hibernate. Now your entity classes can be a plain old PHP object (POPO) with annotations providing persistence information on how to update the persistent store with the field values of an instance of the entity class. 1. Below is the AbstractIdGenerator abstract class provided by Doctrine to be extended by all id generation strategies. 2. 3.