Doctrine Php

Doctrine

When starting work on a brand new project that uses a database, two differentsituations comes naturally. In most cases, the database model is designedand built from scratch. Sometimes, however, you’ll start with an existing andprobably unchangeable database model. Fortunately, Doctrine comes with a bunchof tools to help generate model classes from your existing database.

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Doctrine

The Brezhnev Doctrine was a Soviet foreign policy that proclaimed any threat to socialist rule in any state of the Soviet bloc in Central and Eastern Europe was a threat to them all, and therefore justified the intervention of fellow socialist states. It was proclaimed in order to justify the Soviet-led occupation of Czechoslovakia earlier in. What is Doctrine? Doctrine ORM is an object-relational mapper (ORM) for PHP 7.1+ that provides transparent persistence for PHP objects. It uses the Data Mapper pattern at the heart, aiming for a complete separation of your domain/business logic from the persistence in a relational database management system.

Doctrine Php Annotations

As the Doctrine tools documentation says, reverse engineering is aone-time process to get started on a project. Doctrine is able to convertapproximately 70-80% of the necessary mapping information based on fields,indexes and foreign key constraints. Doctrine can’t discover inverseassociations, inheritance types, entities with foreign keys as primary keysor semantical operations on associations such as cascade or lifecycleevents. Some additional work on the generated entities will be necessaryafterwards to design each to fit your domain model specificities.

This tutorial assumes you’re using a simple blog application with the followingtwo tables: blog_post and blog_comment. A comment record is linkedto a post record thanks to a foreign key constraint.

Before diving into the recipe, be sure your database connection parameters arecorrectly setup in the .env file (or .env.local override file).

The first step towards building entity classes from an existing databaseis to ask Doctrine to introspect the database and generate the correspondingmetadata files. Metadata files describe the entity class to generate based ontable fields.

Doctrine Php Number

This command line tool asks Doctrine to introspect the database and generatenew PHP classes with annotation metadata into src/Entity. This generates twofiles: BlogPost.php and BlogComment.php.

Doctrine Php Orm

Doctrine Php

Tip

It’s also possible to generate the metadata files into XML or eventually into YAML:

Doctrine Phpunit

In this case, make sure to adapt your mapping configuration accordingly:

Generating the Getters & Setters or PHP Classes¶

The generated PHP classes now have properties and annotation metadata, but theydo not have any getter or setter methods. If you generated XML or YAML metadata,you don’t even have the PHP classes!

To generate the missing getter/setter methods (or to create the classes if necessary),run:

Doctrine

Note

If you want to have a OneToMany relationship, you will need to addit manually into the entity (e.g. add a comments property to BlogPost)or to the generated XML or YAML files. Add a section on the specific entitiesfor one-to-many defining the inversedBy and the mappedBy pieces.

The generated entities are now ready to be used. Have fun!