是否可以在Django中基于公共密钥(外键)连接两个模型(表)?如果是这样,请举例说明。为此,我浏览了Django文档。但我着手如何在django中执行原始SQL查询。
谢谢
以下是Django Documentation的一个例子:
from django.db import models
class Reporter(models.Model):
first_name = models.CharField(max_length=30)
last_name = models.CharField(max_length=30)
email = models.EmailField()
def __str__(self):
return "%s %s" % (self.first_name, self.last_name)
class Article(models.Model):
headline = models.CharField(max_length=100)
pub_date = models.DateField()
reporter = models.ForeignKey(Reporter, on_delete=models.CASCADE)
def __str__(self):
return self.headline
class Meta:
ordering = ('headline',)
通过这个例子,您可以通过以下方式轻松访问文章的记者:
print(article.reporter.firstname, article.reporter.last_name)
但是如果你包括运行原始SQL查询,这里有一个例子(关于Django documentation的更多细节):
from django.db import connection
def my_custom_sql(self):
with connection.cursor() as cursor:
cursor.execute("UPDATE bar SET foo = 1 WHERE baz = %s", [self.baz])
cursor.execute("SELECT foo FROM bar WHERE baz = %s", [self.baz])
row = cursor.fetchone()
return row