Python - Django - ORM 操作数据

app01/models.py 中定义的类，也就是创建的表

from django.db import models


# 类必须继承 models.Model
class Admin(models.Model):
    # 创建一个主键自增的字段
    id = models.AutoField(primary_key=True)  # AutoField 为自增的字段
    # 创建一个 varchar 类型的不能为空的字段
    # varchar 类型需要指定最大长度
    username = models.CharField(null=False, max_length=20)
    password = models.CharField(null=False, max_length=20)

admin 表中的数据

Python - Django - ORM 操作数据

在 app01/views.py 中写上获取数据的函数

from django.shortcuts import render
from app01 import models


def admin_list(request):
    admins = models.Admin.objects.all()  # 获取所有数据
    print(admins[0].id, admins[0].username, admins[0].password)
    return render(request, "admin_list.html", {"admin_list": admins})

然后在 mysite/urls.py 中写上对应关系

# -*- coding:utf-8 -*-
__author__ = "MuT6 Sch01aR"

from django.conf.urls import url
from django.shortcuts import HttpResponse, render, redirect
from app01 import views  # 从 app01 中导入函数


# 保存路径和函数的对应关系
urlpatterns = [
    url(r'^admin_list/', views.admin_list)
]

admin_list.html：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>管理员列表</title>
</head>
<body>

<table border="1">
    <thead>
    <tr>
        <th>id</th>
        <th>用户名</th>
        <th>密码</th>
    </tr>
    </thead>
    <tbody>

    {% for user in admin_list %}
        <tr>
        <td>{{ user.id }}</td>
        <td>{{ user.username }}</td>
        <td>{{ user.password }}</td>
        </tr>
    {% endfor %}

    </tbody>
</table>
</body>
</html>

这里用到了 for 循环来读取数据

{% for user in admin_list %}
    <tr>
    <td>{{ user.id }}</td>
    <td>{{ user.username }}</td>
    <td>{{ user.password }}</td>
    </tr>
{% endfor %}

运行结果

Python - Django - ORM 操作数据

添加数据(添加管理员)：

在 admin_list.html 中增加一个添加管理员的选项

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>管理员列表</title>
</head>
<body>

<table border="1">
    <thead>
    <tr>
        <th>id</th>
        <th>用户名</th>
        <th>密码</th>
    </tr>
    </thead>
    <tbody>

    {% for user in admin_list %}
        <tr>
        <td>{{ user.id }}</td>
        <td>{{ user.username }}</td>
        <td>{{ user.password }}</td>
        </tr>
    {% endfor %}

    </tbody>
</table>

<a href="/add_admin/">添加管理员</a>

</body>
</html>

点击后会跳转到 /add_admin/ 进行相关的操作

add_admin.html：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>添加管理员</title>
</head>
<body>

<form action="/add_admin/" method="post">
    <p>用户名:
        <input type="text" name="username">
    </p>
    
    <p>密码:
        <input type="text" name="password">
    </p>
    
    <p>
        <input type="submit" value="提交">
    </p>
</form>

</body>
</html>

app01/views.py 下的代码

from django.shortcuts import render, redirect
from app01 import models


def admin_list(request):
    admins = models.Admin.objects.all()  # 获取所有数据
    print(admins[0].id, admins[0].username, admins[0].password)
    return render(request, "admin_list.html", {"admin_list": admins})


def add_admin(request):
    if request.method == "POST":
        user = request.POST.get("username", None)
        pwd = request.POST.get("password", None)
        # 去数据库中新增一条数据
        models.Admin.objects.create(username=user, password=pwd)
        # 添加成功后跳转
        return redirect("/admin_list/")

    return render(request, "add_admin.html")

在 mysite/urls.py 中添加对应关系

# -*- coding:utf-8 -*-
__author__ = "MuT6 Sch01aR"

from django.conf.urls import url
from django.contrib import admin
from django.shortcuts import HttpResponse, render, redirect
from app01 import views


# 保存路径和函数的对应关系
urlpatterns = [
    url(r'^admin_list/', views.admin_list),
    url(r'^add_admin/', views.add_admin)
]

运行结果：

Python - Django - ORM 操作数据