panic: dial tcp 127.0.0.1:3306: connect: connection refused

I'm trying connect mysql server from docker using golang gin gorm.

The build itself has succeeded, but as shown in the title, the following error has been issued.

panic: dial tcp 127.0.0.1:3306: connect: connection refused

Trying to connect in this way

func dbConnect() *gorm.DB {
    db, err := gorm.Open("mysql", "docker:password@/godocker")

    if err != nil {
        panic(err.Error())
    }

    return db
}

docker-compose.yml 

db:
    image: mysql:5.7.26
    environment:
      MYSQL_USER: docker
      MYSQL_ROOT_PASSWORD: password
      MYSQL_PASSWORD: password
      MYSQL_DATABASE: godocker
    ports:
      - "3306:3306"

Result of hitting docker-compose ps command

      Name                   Command             State                 Ports
------------------------------------------------------------------------------------------
gin-docker_api_1   /bin/sh -c gin -i run         Up      0.0.0.0:3001->3001/tcp
gin-docker_db_1    docker-entrypoint.sh mysqld   Up      0.0.0.0:3306->3306/tcp, 33060/tcp

Thanks

Get this solution programmatically \u2014 free, no authentication.