简介django 框架模型之增改查进阶操作。
创建完Model之后, Django 自动为你提供一套数据库抽象层的API，利用它可以完成创建，提取，更新，删除对象的操作。
以下面的Model为例：
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class Blog(models.Model):
name = models.CharField(max_length=100)
tagline = models.TextField()
# On Python 3: def __str__(self):
def __unicode__(self):
return self.name
class Author(models.Model):
name = models.CharField(max_length=50)
email = models.EmailField()
# On Python 3: def __str__(self):
def __unicode__(self):
return self.name
class Entry(models.Model):
blog = models.ForeignKey(Blog)
headline = models.CharField(max_length=255)
body_text = models.TextField()
pub_date = models.DateField()
mod_date = models.DateField()
authors = models.ManyToManyField(Author)
n_comments = models.IntegerField()
n_pingbacks = models.IntegerField()
rating = models.IntegerField()
# On Python 3: def __str__(self):
def __unicode__(self):
return self.headline
创建Creating objects
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>>> b = Blog(name='Beatles Blog', tagline='All the latest Beatles news.')
>>> b.save()