django 数据库迁移

1.项目目录结构

　　

 2.修改settings.py文件

# 设置数据库连接
DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.mysql',  # mysql.connector.django
        'NAME': '数据库名',
        'USER': '用户名',
        'PASSWORD': '密码',
        'HOST': '127.0.0.1',# 我连接的是本地的mysql
        'PORT': '3306', # 默认端口，根据自己设置的端口进行设置
        'OPTIONS': {
            'init_command': "SET sql_mode='STRICT_TRANS_TABLES'",
        },
    }
}

 3.给__init__.py文件中添加一段代码（首先必须安装pymysql）

import pymysql
pymysql.install_as_MySQLdb()

 4.添加模型（modles.py）

# 图书分类（无限分类）
class BookCategory(models.Model):
    CATEGORY_TYPE = (
        (1, "一级类目"),
        (2, "二级类目"),
        (3, "三级类目"),
        (4, "四级类目"),
    )
    name = models.CharField(default="", max_length=30, verbose_name="类别名", help_text="类别名")
    code = models.CharField(default="", max_length=30, verbose_name="类别code", help_text="类别code")
    desc = models.TextField(default="", verbose_name="类别描述", help_text="类别描述")
    category_type = models.CharField(max_length=100, default="", choices=CATEGORY_TYPE, verbose_name="类目级别",help_text="类目级别")
    parent_category = models.ForeignKey("self", null=True, blank=True, verbose_name="父类目录", on_delete=models.CASCADE)
    is_tab = models.BooleanField(default=False, verbose_name="是否导航", help_text="是否导航")
    add_time = models.DateTimeField(default=datetime.now, verbose_name="添加时间")
    class Mate:
        managed = True
        db_table = 'bookscategory'
        verbose_name = "商品类别"
        verbose_name_plural = verbose_name

    def __str__(self):
        return self.name
# 图书详情
class Books(models.Model):
    category = models.ForeignKey(BookCategory, null=True, blank=True, verbose_name="商品类目", on_delete=models.CASCADE)
    goods_sn = models.CharField(max_length=50, default="", verbose_name="图书唯一货号")
    name = models.CharField(max_length=300, verbose_name="图书名称")
    click_num = models.IntegerField(default=0, verbose_name="点击数")
    sold_num = models.IntegerField(default=0, verbose_name="图书销售量")
    fav_num = models.IntegerField(default=0, verbose_name="收藏数")
    goods_num = models.IntegerField(default=0, verbose_name="库存数")
    market_price = models.FloatField(default=0, verbose_name="市场价格")
    shop_price = models.FloatField(default=0, verbose_name="本店价格")    goods_brief = models.TextField(max_length=500, verbose_name="图书简短描述")
    ship_free = models.BooleanField(default=True, verbose_name="是否承担运费")
    goods_front_image = models.ImageField(upload_to="upload/images", null=True, blank=True, verbose_name="封面图片")
    is_new = models.BooleanField(default=False, verbose_name="是否为新品")
    is_hot = models.BooleanField(default=False, verbose_name="是否为热销")
    add_time = models.DateTimeField(default=datetime.now, verbose_name="添加时间")
    class Mate:
        managed = True
        db_table = 'books'
        verbose_name = "商品详细"
        verbose_name_plural = verbose_name

    def __str__(self):
        return self.name

 5.执行命令（确保MySQL服务开启，注意执行顺序）

python manage.py makemigrations
python manage.py migrate