擅长:python、mysql、java
<p>如果在创建对象时使用现有主键,则可以更新对象</p>
<pre><code>student = Student(name=var.name,
mark=var.mark,
year=newyear)
student.save() # this means create new object
student = Student(pk=existed_pk,name=var.name,
mark=var.mark,
year=newyear)
student.save() # this means update student record which has existed_pk pk
</code></pre>