# 图书 Book:title publicate_date
class Book(models.Model): title = models.CharField(max_length=32, verbose_name='书名') publicate_date = models.DateField(auto_now=True, verbose_name='出版日期') # 增加对出版社的引用 publisher = models.ForeignKey('Publisher', null=True) def __str__(self): return self.title class Meta: verbose_name_plural = '图书' ordering = ['-publicate_date', 'title'] 

# 查询图书
def book(request): book = Book.objects.get(id=1) publisher = book.publisher.name # books=Book.objects.all() return render(request, 'book.html', { # 'books':books 'book': book, 'publisher': publisher }) 

# 查询图书
def book(request): book = Book.objects.get(id=1) publisher = book.publisher.name #查询id为3的出版社的所有书籍 publisher1=Publisher.objects.get(id=1) books=publisher1.book_set.all() print(books) # books=Book.objects.all() return render(request, 'book.html', { # 'books':books 'book': book, 'books': books, 'publisher': publisher, 'publisher1': publisher1.name }) 

class PulisherAdmin(admin.ModelAdmin): # fields = ('name', 'city') fieldsets = ( ('分组1', {'fields': ('name', 'city'), 'classes': ('collapse',)}), ('分组2', {'fields': ('country', 'website')})) list_display = ['name', 'city', 'country', 'website'] 

# 多对多查询
def mtm(request): author = Author.objects.get(id=3) books = author.book.all() return render(request, 'mtm.html', { 'books': books, }) 

# 多对多查询
def mtm(request): author = Author.objects.get(id=3) books = author.book.all() # 反向查询 book = Book.objects.get(id=3) authors = book.author_set.all() return render(request, 'mtm.html', { 'books': books, 'author':author, 'authors': authors, }) 

# 出版社与作者多对多查询
def publisher2author(request): publisher = Publisher.objects.filter(name__exact='北京大学出版社').first() authors = publisher.author.all() return render(request, 'publisher2author.html', { 'authors': authors, }) 

# 声明自定义objects - models.Manager
class AuthorManager(models.Manager): # 添加自定义函数-查询Author表中共有多少条数据 def auCount(self): return self.all().count('*') # count方法统计多少个 # 作者 Author:name age email class Author(models.Model): # 使用AuthorManager覆盖当前的objects objects = AuthorManager() name = models.CharField(max_length=32, verbose_name='姓名') age = models.PositiveSmallIntegerField(verbose_name='年龄') email = models.EmailField(null=True, verbose_name='邮箱') # 增加一个状态列,来表示用户是启用的还是禁用的 isActive = models.BooleanField(default=True) wife = models.OneToOneField('Wife', null=True, verbose_name='妻子') # 创建与书籍的多对多关联 book = models.ManyToManyField('Book') def __str__(self): return self.name class Meta: verbose_name_plural = '作者' # 排序 年龄降序 id升序 ordering = ['-age', 'id'] # 在view控制器中调用 # 出版社与作者多对多查询 def publisher2author(request): publisher = Publisher.objects.filter(name__exact='北京大学出版社').first() authors = publisher.author.all() print('数据总数:', Author.objects.auCount()) return render(request, 'publisher2author.html', { 'authors': authors, }) 

# 声明自定义的objects - Book表
class BookManager(models.Manager): def like(self, s): return self.filter(title__contains=s) 

# 图书 Book:title publicate_date
class Book(models.Model): objects = BookManager() title = models.CharField(max_length=32, verbose_name='书名') publicate_date = models.DateField(auto_now=True, verbose_name='出版日期') # 增加对出版社的引用 publisher = models.ForeignKey('Publisher', null=True, verbose_name='出版社') def __str__(self): return self.title class Meta: verbose_name_plural = '图书' ordering = ['-publicate_date', 'title'] 

# 出版社与作者多对多查询
def publisher2author(request): publisher = Publisher.objects.filter(name__exact='北京大学出版社').first() authors = publisher.author.all() # AuthorManager测试 print('数据总数:', Author.objects.auCount()) # BookManager测试 print('查询包含字段的书籍:', Book.objects.like('三')) return render(request, 'publisher2author.html', { 'authors': authors, }) 

# 声明自定义objects - models.Manager
class AuthorManager(models.Manager): # 添加自定义函数-查询Author表中共有多少条数据 def auCount(self): return self.all().count() # count方法统计多少个 # 查询年纪小于指定年纪的作者信息 def ltAge(self, i): return self.filter(age__lt=i) 

# 作者 Author:name age email
class Author(models.Model): # 使用AuthorManager覆盖当前的objects objects = AuthorManager() name = models.CharField(max_length=32, verbose_name='姓名') age = models.PositiveSmallIntegerField(verbose_name='年龄') email = models.EmailField(null=True, verbose_name='邮箱') # 增加一个状态列,来表示用户是启用的还是禁用的 isActive = models.BooleanField(default=True) wife = models.OneToOneField('Wife', null=True, verbose_name='妻子') # 创建与书籍的多对多关联 book = models.ManyToManyField('Book') def __str__(self): return self.name class Meta: verbose_name_plural = '作者' # 排序 年龄降序 id升序 ordering = ['-age', 'id'] 

# 出版社与作者多对多查询
def publisher2author(request): publisher = Publisher.objects.filter(name__exact='北京大学出版社').first() authors = publisher.author.all() # AuthorManager测试 print('数据总数:', Author.objects.auCount()) print('查询年纪小于指定信息的作者:', Author.objects.ltAge(100)) # BookManager测试 print('查询包含字段的书籍:', Book.objects.like('三')) return render(request, 'publisher2author.html', { 'authors': authors, })