djang增删改查

Posted 2021-01-23 tcpblog

创建表:
from django.db import models
class Publisher(models.Model):
    pid = models.AutoField(primary_key = True)
    name = models.CharField(max_leng=32, uniqure=True)

    def __str__(self):
        return self.name

模板字符串循环:
{% for i in (循环对象) %}
{{forloop.counter}}   # 循环计数数值
xxxxx{{i.属性1}}xxxx{{i.属性2}}
{% endfor %}

{{变量}}

数据的增删改查:
    查询:   models.Publisher.object.all()  # 查询 数据库所有的值
            models.Publisher.object.get()   #查询不到报错
            models.Publisher.object.filter()  # 匹配符合条件的值

            获取到对象>>>>obj.属性

    删除: 先查询到对象obj>>> obj.delete()

    修改: 先查询到对象obj>>> obj.update(字段=new的值)
                             obj.save()
    增加: models.Publisher.object.create(字段=值(field=???))