What is Repository in Magento2 and Why use?

Question

What is Repository in Magento2? Why use this. I want to know more detail about Repository.

Answer 1

Repositories are part of the Service Contracts (they are implementations of interfaces in Api), this means they are meant as public interface to other modules.

In general, the purpose of a repository is to hide the storage related logic.A client of a repository should not care whether the returned entity is held in memory in an array, is retrieved from a MySQL database, fetched from a remote API or from a file.

Repositories generaly have methods like findById(), findByName(), put() or remove().but in Magento we call it as getbyId(), save() and delete() etc.

Repositories do not come with methods to create a new entity, so in that case you will need a factory. But use the factory for the interface, such as

Magento\Catalog\Api\Data\ProductInterfaceFactory 

it will create the right implementation based on DI configuration.

Then use the repository->save() method to save it.

You can use this link for more information.