在Django 框架之外单独连接mysql 数据库

from django.db import connection
from django.conf import settings

settings.configure(
    DATABASES={'default': {
        # 'ENGINE': 'django.db.backends.mysql',
        # 'NAME': 'xxxxxx',
        # 'USER': 'xxxxx',
        # 'PASSWORD': 'xxxxxx.',
        # 'HOST': 'xxxxxx',
        # # 'HOST': 'xxxxxx',
        # 'PORT': '3306',
        # 'OPTIONS': {'charset': 'utf8mb4'},
        'ENGINE': 'django.db.backends.mysql',
        'NAME': 'xxxxx',
        'USER': 'xxxxx',
        'PASSWORD': 'xxxxx',
        'HOST': 'xxxxxxx',
        'PORT': '3306',
        'OPTIONS': {'charset': 'utf8mb4'},
    }, },
)


class cursor(object):
    def __init__(self):
        self.cr = connection.cursor()

    def query(self, sql):
        self.cr.execute(sql)
        res = self.cr.fetchall()
        self.cr.close()
        return res

    def un_query(self, sql):
        return self.cr.execute(sql)

# 测试代码

table = "adapter"

select_columns = ['`id`', '`code`', '`name`', '`show`', '`sort`',  '`enable`']

columns = ['`show`']

sql = "select %(columns)s from %(table)s where `show`!=0 order by sort " % {
    "table": table, "columns": ", ".join(select_columns)}

sql3= "update adapter set `sort` =6, `enable` = 1  where code= 'ATLAS' "

sql4="insert into message_task (sms_phone,sms_template,content) values(18701202840,1324369,999999)"


# 执行

cr =cursor()
res = cr.query(sql4)