Databases and doctrine
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Doctrine ORM allows mapping objects to a relational database like MySQL or PostgreSQL. It provides methods for generating entities from classes, persisting and fetching objects, and querying relationships. Key features include generating database schema from entities, custom repositories for queries, and support for common associations like one-to-one, many-to-many, and lazy loading of related objects.
Databases and doctrine
- 2. Doctrine ORM ● aims to let you map objects to a relational database (such as MySQL, PostgreSQL or Microsoft SQL)
- 3. A Simple Example: A Product ● $ php app/console generate:bundle --namespace=Acme/StoreBundle
- 4. Configuring the Database ● configure your database connection information in an app/config/parameters.yml file
- 5. parameters defined in that file are referenced by the main configuration file:
- 6. Now that Doctrine knows about your database, you can have it create the database for you: ● $ php app/console doctrine:database:create Or destroy the DB: ● $ php app/console doctrine:database:drop force
- 7. Creating your first table...
- 8. Creating an Entity Class ● Create this class inside the Entity directory of your AcmeStoreBundle:
- 9. Add Mapping Information ● Doctrine allows you to persist entire objects to the database and fetch entire objects out of the database.
- 11. Doctrine Field Types Reference ● Strings ● string (used for shorter strings) ● text (used for larger strings) ● Numbers ● integer ● smallint ● bigint ● decimal ● float ● Dates and Times (use a DateTime object for these fields in PHP) ● date ● time ● datetime ● Other Types ● boolean ● object (serialized and stored in a CLOB field) ● array (serialized and stored in a CLOB field) http://docs.doctrine-project.org/projects/doctrine-orm/en/latest/reference/basic- mapping.html#doctrine-mapping-types
- 12. Generating Getters and Setters ● $ php app/console doctrine:generate:entities Acme/StoreBundle/Entity/Product
- 13. ● You can also generate all known entities (i.e. any PHP class with Doctrine mapping information) of a bundle or an entire namespace: ● $ php app/console doctrine:generate:entities AcmeStoreBundle ● $ php app/console doctrine:generate:entities Acme
- 14. Creating the Database Tables/Schema ● $ php app/console doctrine:schema:update force
- 15. Persisting Objects to the Database
- 16. Fetching Objects from the Database
- 17. helpful methods:
- 18. findBy and findOneBy methods to easily fetch objects based on multiple conditions
- 22. Querying for Objects with DQL ● The getResult() method returns an array of results.
- 23. querying for just one object
- 25. Using Doctrine's Query Builder
- 26. Mapping Custom Repository Classes ● a custom repository class for your entity and add methods with your query logic there.
- 27. Creating Custom Repository Classes
- 28. Using Custom Repository Classes ● When using a custom repository class, you still have access to the default finder methods such as find() and findAll().
- 31. since each Product class can relate to exactly one Category object ● Then, generate the setter(s) and getter(s) ● ● tell Doctrine to add the new category table, and product.category_id column, and new foreign key:
- 35. Lazy Loading
- 36. Joining to Related Records
- 37. Field Options
- 38. More on Association Mapping
- 42. One-To-Many, Unidirectional with Join Table
- 49. Mapping Defaults ● defaults for a join column in a one-to-one/many-to-one association is as follows: ● name: "<fieldname>_id" ● referencedColumnName: "id"