Django2.2

Django2.2

报错处理

• 与mysql不兼容

  ImproperlyConfigured: mysqlclient 1.3.13 or newer is required
  

  1. 添加新版组件:

     pip install mysqlclient
     

  2. 移除旧版组件:

     pip uninstall pymysql
     

  3. 删除app目录下pymysql调用

     import pymysql
     
     pymysql.install_as_MySQLdb()
     

• FoginKey报错:

  TypeError: CASCADE() missing 4 required positional arguments: 'collector', 'field', 'sub_objs'
  

  author_detail = models.OneToOneField("AuthorDetails", on_delete=models.CASCADE())
  

  models.CASCADE不能加()

  author_detail = models.OneToOneField("AuthorDetails", on_delete=models.CASCADE)
  

• ORM报错:

  解决ORM错误:django.db.utils.IntegrityError: (1452, 'Cannot add or update a child row: a foreign key constraint fails
  

  settings.py：取消外键检查

  # settings.py
  # 取消外键检查
  'OPTIONS':{
          "init_command":"SET foreign_key_checks = 0;",
  # 完整:
  DATABASES = {
      'default': {
          'ENGINE': 'django.db.backends.mysql',
          'NAME': 'test',
          'HOST':'127.0.0.1',
          'PORT':3306,
          'USER':'root',
          'PASSWORD':'123',
          'OPTIONS': {
              "init_command": "SET foreign_key_checks = 0;",
          }
      }
  }