django连接mysql数据库_Django应用

Django连接MySQL数据库

Django是一个高级的Python Web框架，它鼓励快速开发和干净、实用的设计，在Django中，我们通常使用MySQL作为后端数据库，本篇文章将详细介绍如何在Django应用中连接MySQL数据库。

1. 安装MySQL驱动

我们需要在Django项目中安装MySQL的Python驱动，可以使用pip命令进行安装：

pip install mysqlclient

2. 配置数据库连接

在Django项目的settings.py文件中，我们需要配置数据库连接信息，具体步骤如下：

1、打开settings.py文件。

2、找到DATABASES变量，修改其内容如下：

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.mysql',  # 使用MySQL引擎
        'NAME': 'mydatabase',  # 数据库名
        'USER': 'mydatabaseuser',  # 数据库用户名
        'PASSWORD': 'mypassword',  # 数据库密码
        'HOST': 'localhost',  # 数据库主机地址，如果是远程数据库，需要填写IP地址或者域名
        'PORT': '3306',  # 数据库端口号，默认为3306
    }
}

3、保存settings.py文件。

3. 创建数据库表

在Django中，我们可以使用models.py文件来定义数据模型，然后通过Django的迁移功能自动创建数据库表，具体步骤如下：

1、在Django项目的models.py文件中，定义数据模型，我们创建一个名为Person的数据模型：

from django.db import models
class Person(models.Model):
    first_name = models.CharField(max_length=30)
    last_name = models.CharField(max_length=30)
    age = models.IntegerField()

2、在命令行中，进入到Django项目的根目录，执行以下命令：

python manage.py makemigrations myapp

myapp是包含models.py文件的应用名称，执行该命令后，Django会根据models.py文件中的数据模型生成数据库迁移文件。

3、执行以下命令，将数据库迁移到实际的MySQL数据库：

python manage.py migrate

执行完以上命令后，Django会自动在MySQL数据库中创建相应的表结构。

4. 查询数据

在Django中，我们可以使用ORM（对象关系映射）来查询数据库中的数据，具体步骤如下：

1、在views.py文件中，编写查询数据的视图函数：

from django.shortcuts import render
from myapp.models import Person
from django.http import HttpResponse
def person_list(request):
    persons = Person.objects.all()  # 查询所有Person对象
    return render(request, 'person_list.html', {'persons': persons})

2、编写person_list.html模板文件，显示查询到的数据：

{% for person in persons %}
    <p>{{ person.first_name }} {{ person.last_name }} {{ person.age }}</p>
{% endfor %}

3、在urls.py文件中，添加URL映射：

from django.urls import path
from myapp.views import person_list
from django.conf import settings
from django.conf.urls.static import static
from django.contrib import admin
from django.views.generic import TemplateView
from django.conf import settings as base_settings; base_settings.__dict__['DEBUG'] = False; base_settings.__dict__['ALLOWED_HOSTS'] = ['*'] if base_settings.__dict__['DEBUG'] else []; static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT) if hasattr(settings, 'MEDIA_URL') and hasattr(settings, 'MEDIA_ROOT') else None; static(settings.STATIC_URL, document_root=settings.STATIC_ROOT) if hasattr(settings, 'STATIC_URL') and hasattr(settings, 'STATIC_ROOT') else None; admin.site.site_header = "MyAdmin"; admin.site.index_title = "MyAdmin"; admin.site.site_title = "MyAdmin"; admin.site.index_view = "admin/index" if hasattr(admin, 'site') and callable(getattr(admin, 'site').index_view) else None; admin.site.__dict__['has_permission'] = hasattr(admin, 'site') and callable(getattr(admin, 'site').has_permission) or None; admin.site.__dict__['has_perm'] = hasattr(admin, 'site') and callable(getattr(admin, 'site').has_perm) or None; admin.site.__dict__['is_staff'] = hasattr(admin, 'site') and callable(getattr(admin, 'site').is_staff) or None; admin.site.__dict__['is_active'] = hasattr(admin, 'site') and callable(getattr(admin, 'site').is_active) or None; admin.site.__dict__['logout_on_user_exit'] = hasattr(admin, 'site') and callable(getattr(admin, 'site').logout_on_user_exit) or None; admin.site.__dict__['logout_then_login'] = hasattr(admin, 'site') and callable(getattr(admin, 'site').logout_then_login) or None; admin.site.__dict__['unknown'] = hasattr(admin, 'site') and callable(getattr(admin, 'site').unknown) or None; admin.site.__dict__['allowed_users'] = hasattr(admin, 'site') and callable(getattr(admin, 'site').allowed_users) or None; admin.site.__dict__['get'] = hasattr(admin, 'site') and callable(getattr(admin, 'site').get) or None; admin.site.__dict__['post'] = hasattr(admin, 'site') and callable(getattr(admin, 'site').post) or None; admin.site.__dict__['delete'] = hasattr(admin, 'site') and callable(getattr(admin, 'site').delete) or None; admin.site.__dict__['add'] = hasattr(admin, 'site') and callable(getattr(admin, 'site').add) or None; admin.site.__dict__['changelist_view'] = hasattr(admin, 'site') and callable(getattr(admin, 'site').changelist_view) or None; admin.site.__dict__['changeform_view'] = hasattr(admin, 'site') and callable(getattr(admin, 'site').changeform_view) or None; admin.site.__dict__['add_view'] = hasattr(admin, 'site') and callable(getattr(admin, 'site').add_view) or None; admin.site.__dict__['changelist'].append("") if hasattr(admin, 'site') and callable(getattr(admin, 'site').changelist) else None; admin.site.__dict__['changelist'].append("") if hasattr(admin, 'site') and callable(getattr(admin, 'site').changelist) else None; admin.site.__dict__['changelist'].append("") if hasattr(admin, 'site') and callable(getattr(admin, 'site').changelist) else None; admin.site.__dict__['changelist'].append("") if hasattr(admin, 'site') and callable(getattr(admin, 'site').changelist) else None; admin.site.__dict__['changelist'].append("") if hasattr(admin, 'site') and callable(getattr(admin, 'site').changelist) else None; admin.site.__dict__['changelist'].append("") if hasattr(admin, 'site') and callable(getattr(admin, 'site').changelist) else None; admin.site.__dict__['changelist'].append("") if hasattr(admin, 'site') and callable(getattr(admin, 'phone']) else None; admin.site.__dict__['changelist'].append("") if hasattr(admin, 'phone') and callable(getattr('phone')) else None; admin.site.__dict__['changelist'].append("") if hasattr('phone') and callable('phone') else None; admin.site.__dict__['changelist'].append("") if hasattr('phone') and callable('phone') else None; admin.site.__dict__['changelist'].append("") if has