Django中的自定义查询对象
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2020-02-09 17:34:01
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Django中的自定义查询对象
- 自定义查询对象 - objects
- ①声明一个类EntryManager,继承自models.Manager,并添加自定义函数
- ②使用创建的自定义类EntryManager 覆盖Models中的objects
class AuthorManager(models.Manager):
def name_count(self, keywords):
'''统计姓名中含有某些关键字的数量'''
return self.filter(name__contains=keywords).count()
def lt_age(self, age):
'''查询年龄小于指定年龄的信息'''
return self.filter(age__lt=age)
class Author(models.Model):
objects = AuthorManager()
name = models.CharField(max_length=30, verbose_name='姓名')
age = models.IntegerField(verbose_name='年龄')
email = models.EmailField(null=True, verbose_name='邮箱')
picture = models.ImageField(null=True, upload_to='static/upload/usring', verbose_name='用户头像')
publisher = models.ManyToManyField(Publisher, null=True, verbose_name='出版社')
def myself(request):
'''自定义查询函数'''
num = Author.objects.name_count(keywords='王')
authors = Author.objects.lt_age(age=36)
return render(request, 'name_count.html', locals())
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转载自blog.csdn.net/weixin_43883022/article/details/102522511