新建Django项目步骤

1.使用PyCharm

1.2 创建完成后就是这样

2.查看settings.py 文件

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'app01.apps.App01Config',  # 因为使用的是pycharm创建的app01,所以这里不用添加，如果是使用命令创建则需要添加
]

2.1中间件配置

MIDDLEWARE = [
    'django.middleware.security.SecurityMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
]

2.3 配置数据库

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.mysql',
        'NAME': 'orm_home',
        'HOST': '127.0.0.1',
        'PORT': 3306,
        'USER': 'root',
        'PASSWORD': '',

    }
}

注意：使用mysql的时候需要另外配置

3.创建数据库

mysql -uroot -p'xxx'
create database orm_home;

3.1 Django连接数据库

3.2 创建表

models.py文件中

from django.db import models


# Create your models here.
# 书
class Book(models.Model):
    title = models.CharField(max_length=32)
    publish_date = models.DateField(auto_now_add=True)
    price = models.DecimalField(max_digits=5, decimal_places=2)
    memo = models.TextField(null=True)
    # 创建外键，关联publish
    publisher = models.ForeignKey(to="Publisher")
    # 创建多对多关联author
    author = models.ManyToManyField(to="Author")

    def __str__(self):
        return "<Book object: {} {}>".format(self.id, self.title)


# 出版社
class Publisher(models.Model):
    name = models.CharField(max_length=32)
    city = models.CharField(max_length=32)

    def __str__(self):
        return "<Publisher object: {} {}>".format(self.id, self.name)


# 作者
class Author(models.Model):
    name = models.CharField(max_length=32)
    age = models.IntegerField()
    phone = models.CharField(max_length=11)

    def __str__(self):
        return "<Author object: {} {}>".format(self.id, self.name)