八、Python Django数据库添加查询

发布时间：2020-07-21 16:38:23 作者：sdgjsdgjdfgj
阅读：611

亿速云数据库,弹性扩容,低至0.3元/天! 查看>>

Python Django数据库添加查询

对数据进行操作

一、创建记录

# pwd

/root/csvt03

# ipython manage.py shell

In [1]: from blog.models import Employee

#(第一种方法)

In [2]: Employee

Out[2]: blog.models.Employee

In [3]: emp = Employee()

In [4]: emp.name = 'Alen'

In [5]: emp.save()

#(第二种方法)

In [6]: emp = Employee(name='Tom')

In [7]: emp.save()

#(第三种方法)

调用管理器create

In [8]: Employee.objects.create(name='Max')

查询数据库已经创建了记录

二、查询记录

# ipython manage.py shell

In [13]: emps = Employee.objects.all()

In [14]: emps

Out[14]: [<Employee: Employee object>, <Employee: Employee object>, <Employee: Employee object>, <Employee: Employee object>]

In [16]: emps[0].id

Out[16]: 1L

In [17]: emps[0].name

Out[17]: u'Alen'

In [18]: emps[1].name

Out[18]: u'Tom'

In [19]: emps[2].name

Out[19]: u'Max'

# cat blog/models.py

from django.db import models

class Employee(models.Model):

name = models.CharField(max_length=20)

def __unicode__(self): # 通过__unicode__使查询出来的数据以字符串的方式显示

return self.name

# ipython manage.py shell

In [1]: from blog.models import Employee

In [2]: emp = Employee.objects.all()

In [3]: emp

Out[3]: [<Employee: Alen>, <Employee: Tom>, <Employee: Max>, <Employee: Sumer>]

三、传递到web页面显示查询结果

# 添加URL，以及添加index.html模板文件

# egrep -v "#|^$" urls.py

from django.conf.urls.defaults import patterns, include, url

urlpatterns = patterns('',

url(r'^index/$','blog.views.index'),

)

# egrep -v "#|^$" blog/models.py

from django.db import models

class Employee(models.Model):

name = models.CharField(max_length=20)

def __unicode__(self):

return self.name

# egrep -v "#|^$" blog/templates/index.html

<head>

<title>Loyu Django test</title>

</head>

<body>

{% for emp in emps %}

<div>`forloop`.`counter`:`emp`</div>

{% endfor %}

</body>

</html>

四、启动项目

# nohup python manage.py runserver & (使用nohup支持后台启动)

亿速云「云数据库 MySQL」免部署即开即用，比自行安装部署数据库高出1倍以上的性能，双节点冗余防止单节点故障，数据自动定期备份随时恢复。点击查看>>

八、Python Django数据库添加查询

相关阅读