Doctrine ORM & Entity Mapping Session

Question 1 of 12

What is the primary purpose of Doctrine ORM in a Symfony project?

To handle HTTP requests and responses. To render HTML templates. To define the application's routing system. To manage database interactions and object persistence.

Question 2 of 12

Which annotation is commonly used to define an entity in Doctrine?

@Service

@Route

@Template

@Entity

Question 3 of 12

What does the

@ORM\Column

annotation specify?

A relationship between entities. A method to be executed before or after an entity is persisted. A validation rule for the entity. A property of the entity that should be mapped to a database column.

Question 4 of 12

What is the purpose of the

doctrine:schema:update

command?

To generate entity classes from the database schema. To update the database schema to match the current entity mappings. To create a new database. To delete all data from the database.

Question 5 of 12

Which of the following is a valid Doctrine relationship mapping annotation for a one-to-many relationship?

@ORM\OneToOne

@ORM\ManyToMany

@ORM\OneToMany

@ORM\ManyToOne

Question 6 of 12

What is the role of the

EntityManagerInterface

in Doctrine?

To define routes and controllers. To manage the lifecycle of entities and persist data to the database. To render templates. To handle user authentication.

Question 7 of 12

What does the

orphanRemoval=true

option in a

@ORM\OneToMany

mapping do?

It automatically deletes related entities when the owning entity is deleted. It automatically deletes related entities when they are no longer associated with the owning entity. It ignores orphaned entities during database queries. It prevents the owning entity from being deleted if it has related entities.

Question 8 of 12

How can you define a custom repository class for a Doctrine entity?

By adding a

repositoryClass

attribute to the

@Entity

annotation. By defining a custom route for the entity. By creating a service with the entity's class name. By extending the default

EntityRepository

class and configuring it in

services.yaml

.

Question 9 of 12

What is the purpose of using DQL (Doctrine Query Language)?

To query the database using an object-oriented syntax. To define routes and controllers. To interact with the database using SQL. To define the database schema.

Question 10 of 12

What is the difference between

persist()

and

flush()

methods in Doctrine?

persist()

saves the entity to the database immediately, while

flush()

only schedules it for saving.

persist()

deletes the entity from the database, while

flush()

updates it.

persist()

schedules the entity for saving, while

flush()

executes the scheduled changes to the database. They are interchangeable and do the same thing.

Symfony | Doctrine Orm & Entity Mapping