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Data sources

LoopBack is a highly-extensible, open-source Node.js framework.

Feature :

Installing:

`npm install @loopback/cli -g`

The command-line interface the scaffolds a project or create an application, Skelton.

Create a new project:

`$ lb4 app`

Folder Structure :

File Purpose

index.ts

Allows importing contents of the src folder (for use elsewhere)

index.js

Top-level file connecting components of the application.

package.json

tsconfig.json

tslint.json

tslint.build.json

README.md

The Markdown-based README generated for your application.

LICENSE

A copy of the MIT license. If you do not wish to use this license, please delete this file.

src/application.ts

src/index.ts

src/sequence.ts

src/controllers/README.md

Provides information about the controller directory, how to generate new controllers, and where to find more information.

src/controllers/ping.controller.ts

A basic controller that responds to GET requests at /ping.

src/datasources/README.md

Provides information about the data sources directory, how to generate new data sources, and where to find more information.

src/models/README.md

Provides information about the model's directory, how to generate new models, and where to find more information.

src/repositories/README.md

Provides information about the repositories directory, how to generate new repositories, and where to find more information.

Please place your tests in this folder.

An example test to go with the ping controller in src/controllers.

.mocharc.json

Add User Model:

A model describes business domain objects and defines a list of properties with name, type, and other constraints.

Models are used for data exchange on the wire or between different systems.

Building your User model

A User list is all about employee details. For this to be a useful organization.

The user model has the following properties:

Id : a unique id

Name : an employee Name

Department: Name of Department.

EmpAddress: Address of Employee.

Data sources are LoopBack’s way of connecting to various sources of data, such as databases

The repository pattern is one of the more fundamental differences between LoopBack 3 and 4. In LoopBack 3, you would use the model class definitions themselves to perform CRUD operations. In LoopBack 4, the layer responsible for this has been separated from the definition of the model itself, into the repository layer.

In LoopBack 4, controllers handle the request-response lifecycle for your API. Each function on a controller can be addressed individually to handle an incoming request (like a POST request to /todos), to perform business logic, and to return a response.

Controller is a class that implements operations defined by the application’s API. It implements an application’s business logic and acts as a bridge between the HTTP/REST API and domain/database models.

Let’s try out our application! First, you’ll want to start the app.

`npm start`

Without write single lines code API is ready. We can able to see all the API for the related model.

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