Mysql基本操作
        show databases;
        
        use test;
        
        show tables;
        
        show global variables like 'port';
        
        create databse guest character set utf8;
        
python操作mysql
    主要方法步骤
        connect():建立数据库连接
        cursor():获取数据库操作游标
        execute():执行sql语句.
        commit():提交数据库执行
        close():关闭数据库连接
        
在setting中配置
    python数据库配置    
                DATABASES = {
            'default':{
                'ENGINE':'django.db.backends.mysql',
                'HOST':'localhost',
                'PORT':'3306',
                'NAME':'guest',
                'USER':'root',
                'PASSWORD':'123456',
                'OPTIONS':{
                    'init_command':"SET sql_mode='STRICT_TRANS_TABLES'",
                },
            }
        }
        
        然后进行数据迁移
            python manage.py migrate
            
    报如下的错误
        settings.DATABASES is improperly configured.
        Please supply the ENGINE value. 
        Check settings documentation for more details.
    可能是拼写错,...不好意思眼神不好
    
    再次报错:    
        raise ImproperlyConfigured
        ('mysqlclient 1.3.13 or newer is required;
        you have %s.' % Database.__version__)
        django.core.exceptions.ImproperlyConfigured:
        mysqlclient 1.3.13 or newer is required; 
        you have 0.9.3.
    参考解决:
        https://blog.csdn.net/qq_35304570/article/details/79674449
        
        
        
    然后数据库也报错了,因为使用mysql8.0,版本问题
        参看文档如下:
    https://blog.csdn.net/p_xiaobai/article/details/85334875
    
    然后又报错
        File "C:\Users\mi\AppData\Local\Programs\Python\Python37\lib\site-packages\django\db\backends\mysql\operations.py", line 146, in last_executed_query
        query = query.decode(errors='replace')
        AttributeError: 'str' object has no attribute 'decode'
        
        网上搜索了一下,没有有用的办法,大概是类型转换问题
        
        我直接在对应文档,改了一下就可以了
              query = 'replace' #query.decode(errors='replace')
    
    好吧完成了,这些东西都是坑啊...