Memcached – How to fix SQLSTATE[HY000] [2002] Connection refused, when running : php artisan migrate in docker bash?

I’m trying to run "php artisan migrate" in docker app container bash, after successfully installing mysql, nginx, php and etc. containers.

But this error comes up :

SQLSTATE[HY000] [2002] Connection refused (SQL: select * from information_schema.tables where table_schema = code_clan and table_name = migrations and table_type = ‘B
ASE TABLE’)

This is my folder/files structure :

> docker-my-app(folder)
  > docker(folder)
    > nginx(folder)
      > default.conf
    > php-fpm(folder)
      > Dockerfile
  > src(folder)
    > www(folder)
      > Laravel Project Files...
      > **.env**

  **docker-compose.yml**

This is my composer file (docker-compose.yml):

version: '3.8'

services:

  nginx:
    ports:
      - "80:80"
    image: nginx
    tty : true
    restart: unless-stopped
    volumes:
      - ./src/www:/usr/share/nginx/html:delegated
      - ./docker/nginx/default.conf:/etc/nginx/conf.d/default.conf
    networks:
      - thenetwork
  
  app:
    build: ./docker/php-fpm
    container_name: myapp
    tty : true
    restart: unless-stopped
    environment:
      SERVICE_NAME: myapp
      SERVICE_TAGS: dev
    networks:
      - thenetwork
    working_dir: /usr/share/nginx/html
    volumes:
      - ./src/www:/usr/share/nginx/html
      - ./data/upload:/storage/uploads
  
  memcached:
    image: memcached

  mysql:
    ports:
      - "3306:3306"
    image: mysql:5.6
    restart: unless-stopped
    tty: true
    volumes:
      - mysqlvolume:/var/lib/mysql
      - ./data/mysql-import:/docker-entrypoint-initdb.d
    environment:
        - MYSQL_ROOT_PASSWORD=pwd
        - MYSQL_HOST=localhost
        - MYSQL_PORT=3306
    networks:
      - thenetwork

  redis:
    ports:
      - "6379:6379"
    image: redis



#Docker netwtorks
networks:
  thenetwork:
    driver: bridge
volumes:
  mysqlvolume:
    driver: local

This is my .env file (inside the root of laravel project):

APP_NAME=MyApp
APP_ENV=local
APP_KEY=base64:generatedKey
APP_DEBUG=true
APP_URL=http://localhost

LOG_CHANNEL=daily
LOG_DEPRECATIONS_CHANNEL=null
LOG_LEVEL=debug

DB_CONNECTION=mysql
DB_HOST=127.0.0.1
DB_PORT=3306
DB_DATABASE=lara_app
DB_USERNAME=root
DB_PASSWORD=pwd
...

Inside docker-my-app cmd, I run :

 docker exec -it myapp bash

And inside there, I run :

/usr/share/nginx/html$ php artisan migrate

all the containers, including mysql are running successfuly.
And the error mentioned at the beginning happens.

Can you figure out what happens here?