一、引入模型的包
1 from myApp.models import Grades,Students
二、查询所有数据
#objecs是类的隐藏属性；类名.objects.all()可以查询所有数据 Grades.objects.all()
三、添加数据（本质：创建一个模型类的对象实例）
1 from myApp.models import Grades,Students 2 3 grade1 = Grades() 4 grade1.gname = "python04" 5 grade1.gdate = datetime(year=2017, month=7, day=17) 6 grade1.ggirlnum = 3 7 grade1.gboynum = 70 8 grade1.save() # 模型和数据库交互，存储数据