1 class Publisher(models.Model):
 2     name = models.CharField(max_length=30, verbose_name="名称")
 3     address = models.CharField("地址", max_length=50)
 4     city = models.CharField('城市',max_length=60)
 5     state_province = models.CharField(max_length=30)
 6     country = models.CharField(max_length=50)
 7     website = models.URLField()
 8
 9     class Meta:
10         verbose_name = '出版商'
11         verbose_name_plural = verbose_name
12
13     def __str__(self):
14         return self.name
15
16 class Author(models.Model):
17     name = models.CharField(max_length=30)
18     def __str__(self):
19         return self.name
20
21 class AuthorDetail(models.Model):
22     sex = models.BooleanField(max_length=1, choices=((0, '男'),(1, '女'),))
23     email = models.EmailField()
24     address = models.CharField(max_length=50)
25     birthday = models.DateField()
26     author = models.OneToOneField(Author)
27
28 class Book(models.Model):
29     title = models.CharField(max_length=100)
30     authors = models.ManyToManyField(Author)
31     publisher = models.ForeignKey(Publisher)
32     publication_date = models.DateField()
33     price=models.DecimalField(max_digits=5,decimal_places=2,default=10)
34     def __str__(self):
35         return self.title

from app01.models import *一、单表增加数据#create方式一:   Author.objects.create(name='Alvin')#create方式二:   Author.objects.create(**{"name":"alex"})#save方式一:     author=Author(name="alvin")
                            author.save()#save方式二:     author=Author()author.name="alvin"author.save()二、1对多增加数据 #方式一：#Book.objects.create(title='vb',publisher_id=1, publication_date="2016-7-7",price=198)#方式二：#publisher_obj = Publisher.objects.get(id=3)#Book.objects.create(title='vb',publisher=publisher_obj, publication_date="2016-7-7",price=198)备注：将 publisher_id=2 改为  publisher=publisher_obj三、多对多增加数据1.#为id=1这本书增加2个作者。将数据增加到第三张表中# 正向增加author1=Author.objects.get(id=1)author2=Author.objects.filter(name='alvin')[0]book=Book.objects.filter(id=1)[0]book.authors.add(author1,author2)2.#反向增加#将多本书增加到一个作者book=models.Book.objects.filter(id__gt=1)authors=models.Author.objects.filter(id=1)[0]authors.book_set.add(*book)authors.book_set.remove(*book)3.如果第三张表是通过models.ManyToManyField()自动创建的,那么绑定关系只有上面一种方式#如果第三张表是自己创建的:class Book2Author(models.Model):author=models.ForeignKey("Author")Book=  models.ForeignKey("Book")#那么就还有一种方式:author_obj=models.Author.objects.filter(id=2)[0]book_obj  =models.Book.objects.filter(id=3)[0]s=models.Book2Author.objects.create(author_id=1,Book_id=2)s.save()s=models.Book2Author(author=author_obj,Book_id=1)s.save()

1.删除BOOK表id=1的数据Book.objects.filter(id=1).delete()

2.删除一个出版社. 注意与出版相关联的书也会被删除 　　Publisher.objects.filter(id=3).delete()3.删除id=6这本书和作者id=1的关联(删除第三张关系表数据)book = Book.objects.filter(id=6)[0]   # 找到这本书的对象author = Author.objects.filter(id=1)[0] # 找到这个作者的对象
author.book_set.remove(book)  # 反向删除book.authors.remove(author)    # 正向删除

1.对象更新(所有字段更新，性能低)ret = Publisher.objects.get(id=2)ret.name = "复旦大学"ret.save()2.级联方法更新Publisher.objects.filter(id=1).update(city="北京市")

1.了不起的双下划线(__)之单表条件查询
# models.Tb1.objects.filter(id__lt=10, id__gt=1)   # 获取id大于1 且 小于10的值
#
# models.Tb1.objects.filter(id__in=[11, 22, 33])   # 获取id等于11、22、33的数据
# models.Tb1.objects.exclude(id__in=[11, 22, 33])  # not in
#
# models.Tb1.objects.filter(name__contains="ven")
# models.Tb1.objects.filter(name__icontains="ven") # icontains大小写不敏感
#
# models.Tb1.objects.filter(id__range=[1, 2])   # 范围bettwen and
#
# startswith，istartswith, endswith, iendswith,2.了不起的双下划线(__)之多表条件关联查询
# 正向查找(条件)# ret3=models.Book.objects.filter(title='Python').values('id')
# print(ret3)#[{'id': 1}]
#正向查找(条件)之一对多      ret4=models.Book.objects.filter(title='Python').values('publisher__city')print(ret4)  #[{'publisher__city': '北京'}]#正向查找(条件)之多对多ret5=models.Book.objects.filter(title='Python').values('author__name')print(ret5)ret6=models.Book.objects.filter(author__name="alex").values('title')print(ret6)#注意#正向查找的publisher__city或者author__name中的publisher,author是book表中绑定的字段#一对多和多对多在这里用法没区别# 反向查找(条件)#反向查找之一对多:ret8=models.Publisher.objects.filter(book__title='Python').values('name')print(ret8)#[{'name': '人大出版社'}]  注意,book__title中的book就是Publisher的关联表名
ret9=models.Publisher.objects.filter(book__title='Python').values('book__authors')print(ret9)#[{'book__authors': 1}, {'book__authors': 2}]#反向查找之多对多:ret10=models.Author.objects.filter(book__title='Python').values('name')print(ret10)#[{'name': 'alex'}, {'name': 'alvin'}]#注意#正向查找的book__title中的book是表名Book#一对多和多对多在这里用法没区别