问连接mysql数据库代码在什么文件里

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.mysql',
        'NAME': 'mydatabase',
        'USER': 'mydatabaseuser',
        'PASSWORD': 'mypassword',
        'HOST': '127.0.0.1',
        'PORT': '3306',
    }
}

module.exports = {
    database: {
        host: '127.0.0.1',
        user: 'mydatabaseuser',
        password: 'mypassword',
        database: 'mydatabase'
    }
};

spring.datasource.url=jdbc:mysql://127.0.0.1:3306/mydatabase
spring.datasource.username=mydatabaseuser
spring.datasource.password=mypassword

'mysql' => [
    'driver' => 'mysql',
    'host' => env('DB_HOST', '127.0.0.1'),
    'port' => env('DB_PORT', '3306'),
    'database' => env('DB_DATABASE', 'mydatabase'),
    'username' => env('DB_USERNAME', 'mydatabaseuser'),
    'password' => env('DB_PASSWORD', ''),
],