# arjunbaladarshan/2026_bewt_nest_crud-mysqldemo architecture

> Architecture diagram of the GitHub repository arjunbaladarshan/2026_bewt_nest_crud-mysqldemo, generated by GitDiagram from its file tree, README and a sample of source files (last updated 2026-09-28). It is an AI-made overview: check details against the source.

- Interactive diagram: https://gitdiagram.com/arjunbaladarshan/2026_bewt_nest_crud-mysqldemo
- Repository: https://github.com/arjunbaladarshan/2026_bewt_nest_crud-mysqldemo

## Overview

This is a NestJS student CRUD API backed by MySQL, with a small root greeting endpoint. The main workflow is an HTTP client calling the student controller, which delegates CRUD operations to a service that uses a TypeORM repository for student records. The root module configures MySQL from environment settings and registers the student feature. The README is the generic Nest starter README; architecture details here come from the sampled source, so no additional product capabilities are inferred.

Main entry points: [`src/student/student.controller.ts`](https://github.com/arjunbaladarshan/2026_bewt_nest_crud-mysqldemo/blob/master/src/student/student.controller.ts) (Student controller), [`src/app.module.ts`](https://github.com/arjunbaladarshan/2026_bewt_nest_crud-mysqldemo/blob/master/src/app.module.ts) (Root module), [`src/student/student.service.ts`](https://github.com/arjunbaladarshan/2026_bewt_nest_crud-mysqldemo/blob/master/src/student/student.service.ts) (Student service), [`src/app.controller.ts`](https://github.com/arjunbaladarshan/2026_bewt_nest_crud-mysqldemo/blob/master/src/app.controller.ts) (Root controller)

## Diagram (Mermaid)

```mermaid
flowchart TD

subgraph group_runtime["Application runtime"]
  node_bootstrap["Bootstrap<br/>[main.ts]"]
  node_root_module["Root module<br/>[app.module.ts]"]
  node_root_controller["Root controller<br/>[app.controller.ts]"]
  node_root_service["Greeting service<br/>[app.service.ts]"]
end

subgraph group_students["Student API"]
  node_student_module["Student module<br/>[student.module.ts]"]
  node_student_controller["Student controller"]
  node_student_service["Student service<br/>[student.service.ts]"]
  node_create_dto["Create DTO"]
  node_update_dto["Update DTO"]
end

subgraph group_persistence["Persistence and configuration"]
  node_student_entity["Student entity<br/>[student.entity.ts]"]
  node_mysql[("MySQL database")]
  node_environment["Environment settings"]
end

node_client(("HTTP client"))

node_client -->|"HTTP request"| node_root_controller
node_client -->|"CRUD request"| node_student_controller
node_bootstrap -->|"creates app"| node_root_module
node_root_controller -->|"calls greeting"| node_root_service
node_root_module -->|"registers"| node_student_module
node_student_controller -->|"delegates CRUD"| node_student_service
node_student_controller -->|"accepts create data"| node_create_dto
node_student_controller -->|"accepts update data"| node_update_dto
node_update_dto -->|"partially extends"| node_create_dto
node_student_service -->|"CRUD via repository"| node_mysql
node_student_service -->|"uses entity"| node_student_entity
node_root_module -->|"configures TypeORM"| node_mysql
node_environment -->|"provides DB settings"| node_root_module

click node_bootstrap "https://github.com/arjunbaladarshan/2026_bewt_nest_crud-mysqldemo/blob/master/src/main.ts"
click node_root_module "https://github.com/arjunbaladarshan/2026_bewt_nest_crud-mysqldemo/blob/master/src/app.module.ts"
click node_root_controller "https://github.com/arjunbaladarshan/2026_bewt_nest_crud-mysqldemo/blob/master/src/app.controller.ts"
click node_root_service "https://github.com/arjunbaladarshan/2026_bewt_nest_crud-mysqldemo/blob/master/src/app.service.ts"
click node_student_module "https://github.com/arjunbaladarshan/2026_bewt_nest_crud-mysqldemo/blob/master/src/student/student.module.ts"
click node_student_controller "https://github.com/arjunbaladarshan/2026_bewt_nest_crud-mysqldemo/blob/master/src/student/student.controller.ts"
click node_student_service "https://github.com/arjunbaladarshan/2026_bewt_nest_crud-mysqldemo/blob/master/src/student/student.service.ts"
click node_create_dto "https://github.com/arjunbaladarshan/2026_bewt_nest_crud-mysqldemo/blob/master/src/student/dto/create-student.dto.ts"
click node_update_dto "https://github.com/arjunbaladarshan/2026_bewt_nest_crud-mysqldemo/blob/master/src/student/dto/update-student.dto.ts"
click node_student_entity "https://github.com/arjunbaladarshan/2026_bewt_nest_crud-mysqldemo/blob/master/src/student/entities/student.entity.ts"

classDef toneNeutral fill:#f8fafc,stroke:#334155,stroke-width:1.5px,color:#0f172a
classDef toneBlue fill:#dbeafe,stroke:#2563eb,stroke-width:1.5px,color:#172554
classDef toneAmber fill:#fef3c7,stroke:#d97706,stroke-width:1.5px,color:#78350f
classDef toneMint fill:#dcfce7,stroke:#16a34a,stroke-width:1.5px,color:#14532d
classDef toneRose fill:#ffe4e6,stroke:#e11d48,stroke-width:1.5px,color:#881337
classDef toneIndigo fill:#e0e7ff,stroke:#4f46e5,stroke-width:1.5px,color:#312e81
classDef toneTeal fill:#ccfbf1,stroke:#0f766e,stroke-width:1.5px,color:#134e4a
class node_bootstrap,node_root_module,node_root_controller,node_root_service,node_client toneBlue
class node_student_module,node_student_controller,node_student_service,node_create_dto,node_update_dto toneAmber
class node_student_entity,node_mysql,node_environment toneMint
```

## Components

### Application runtime

- [Bootstrap](https://github.com/arjunbaladarshan/2026_bewt_nest_crud-mysqldemo/blob/master/src/main.ts): `src/main.ts`
- [Root module](https://github.com/arjunbaladarshan/2026_bewt_nest_crud-mysqldemo/blob/master/src/app.module.ts): `src/app.module.ts`
- [Root controller](https://github.com/arjunbaladarshan/2026_bewt_nest_crud-mysqldemo/blob/master/src/app.controller.ts): `src/app.controller.ts`
- [Greeting service](https://github.com/arjunbaladarshan/2026_bewt_nest_crud-mysqldemo/blob/master/src/app.service.ts): `src/app.service.ts`

### Student API

- [Student module](https://github.com/arjunbaladarshan/2026_bewt_nest_crud-mysqldemo/blob/master/src/student/student.module.ts): `src/student/student.module.ts`
- [Student controller](https://github.com/arjunbaladarshan/2026_bewt_nest_crud-mysqldemo/blob/master/src/student/student.controller.ts): `src/student/student.controller.ts`
- [Student service](https://github.com/arjunbaladarshan/2026_bewt_nest_crud-mysqldemo/blob/master/src/student/student.service.ts): `src/student/student.service.ts`
- [Create DTO](https://github.com/arjunbaladarshan/2026_bewt_nest_crud-mysqldemo/blob/master/src/student/dto/create-student.dto.ts): `src/student/dto/create-student.dto.ts`
- [Update DTO](https://github.com/arjunbaladarshan/2026_bewt_nest_crud-mysqldemo/blob/master/src/student/dto/update-student.dto.ts): `src/student/dto/update-student.dto.ts`

### Persistence and configuration

- [Student entity](https://github.com/arjunbaladarshan/2026_bewt_nest_crud-mysqldemo/blob/master/src/student/entities/student.entity.ts): `src/student/entities/student.entity.ts`
- **MySQL database**
- **Environment settings**

### Other components

- **HTTP client**

## Connections

- HTTP client → Root controller: HTTP request
- HTTP client → Student controller: CRUD request
- Bootstrap → Root module: creates app
- Root controller → Greeting service: calls greeting
- Root module → Student module: registers
- Student controller → Student service: delegates CRUD
- Student controller → Create DTO: accepts create data
- Student controller → Update DTO: accepts update data
- Update DTO → Create DTO: partially extends
- Student service → MySQL database: CRUD via repository
- Student service → Student entity: uses entity
- Root module → MySQL database: configures TypeORM
- Environment settings → Root module: provides DB settings