DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.mysql',
        'NAME': 'sphinx',
        'USER': 'root',
        'HOST': '192.168.3.37',
        'PORT': '3305',
    },
    'sph':{
          'ENGINE': 'django.db.backends.mysql',
        'NAME': 'tc-db-main',
        'USER': 'root',
        'HOST': '192.168.3.37',
        'PORT': '3305',
    }
}

def my_custom_sql(self):
    cursor = connections['sph'].cursor()
   
    cursor.execute("SELECT name FROM tc-db-main.sm", [self.sph])
    row = cursor.fetchone()

    return row