Python学习---抽屉框架分析[数据库设计分析]180313

基本的：

models.py

####################################以下都是抽屉的代码####################################
from django.db import models
# 记录用户注册的次数
class SendMsg(models.Model):
    nid = models.AutoField(primary_key=True)  # 自定义id名为nid,默认id名是id【固定格式】
    email = models.CharField(max_length=32, unique=True)
    code = models.CharField(max_length=6)
    ctime = models.DateTimeField()
    times = models.IntegerField(default=0)

# 新闻类型
class NewsType(models.Model):
    caption = models.CharField(max_length=16)

# 抽屉的用户表设计
class UserInfo(models.Model):
    nid = models.AutoField(primary_key=True)
    username = models.CharField(max_length=32, unique=True)
    password = models.CharField(max_length=32)
    email = models.CharField(max_length=32, unique=True)
    ctime = models.DateTimeField()

# 新闻表
class News(models.Model):
    # 可以自己创建id，AutoField且primary_key = True【默认id=id】
    title = models.CharField(max_length=64)   # 标题
    summary = models.CharField(max_length=128, null=True)  # [内容，可为空简介]
    url = models.URLField(null=True)
    ctime = models.DateTimeField(auto_now_add=True)
    # 下面2个user效果同，只是写法不同
    # user = models.ForeignKey('UserInfo', on_delete=True, to_field='nid')  # 跟UserInfo的nid进行关联
    user = models.ForeignKey(to="UserInfo", to_field='nid', related_name='n', on_delete=True)       # 跟UserInfo表关联
    nt = models.ForeignKey(to='NewsType', to_field='id', related_name='tn', on_delete=True)    # 关联NewsType表，关联默认的id
    # 引用下面一行代码，就不需要下面的Favor表了，2个一个效果【这里采用点赞表实现,所以注释了】
    # favor = models.ManyToManyField(to='UserInfo')  # 默认关联的就是主键
    favor_count = models.IntegerField(default=0)   # 每点赞一次就增加1，同时给顶踩表添加一条数据
    comment_count = models.IntegerField(default=0) # 每评论一次就增加1，同时给评论表添加一条数据

# 点赞表
class Favor(models.Model):
     user = models.ForeignKey(to='UserInfo', to_field='nid', on_delete=True)
     news = models.ForeignKey(to='News', to_field='id', on_delete=True)

# 评论表
class Comment(models.Model):
    news = models.ForeignKey(to='News', to_field='id', on_delete=True)
    user = models.ForeignKey(to='UserInfo', to_field='nid', on_delete=True)
    content = models.CharField(max_length=150)
    ctime = models.DateTimeField(auto_now_add=True)
    device = models.CharField(max_length=16, null=True)

# 顶踩表：记录你顶过那个用户的哪条新闻，踩过哪个用户的哪条新闻

高级的：

这里使用many2many实现news和Useinfo的多对多的关系

我们在News里面是用来favor_count和comment_count来实现页面显示的点赞个数和评论个数的统计，后续页面有数据过来的时候，我们给favor_count和comment_count加1，且插入数据在comment和favor表中。[虽然消耗了硬盘，但是提高了速度]

models.py

####################################以下都是抽屉的代码####################################
from django.db import models
# 记录用户注册的次数
class SendMsg(models.Model):
    nid = models.AutoField(primary_key=True)  # 自定义id名为nid,默认id名是id【固定格式】
    email = models.CharField(max_length=32, unique=True)
    code = models.CharField(max_length=6)
    ctime = models.DateTimeField()
    times = models.IntegerField(default=0)

# 新闻类型
class NewsType(models.Model):
    caption = models.CharField(max_length=16)

# 抽屉的用户表设计
class UserInfo(models.Model):
    nid = models.AutoField(primary_key=True)
    username = models.CharField(max_length=32, unique=True)
    password = models.CharField(max_length=32)
    email = models.CharField(max_length=32, unique=True)
    ctime = models.DateTimeField()

# 新闻表
class News(models.Model):
    # 可以自己创建id，AutoField且primary_key = True【默认id=id】
    title = models.CharField(max_length=64)   # 标题
    summary = models.CharField(max_length=128, null=True)  # [内容，可为空简介]
    url = models.URLField(null=True)
    ctime = models.DateTimeField(auto_now_add=True)
    # 下面2个user效果同，只是写法不同
    # user = models.ForeignKey('UserInfo', on_delete=True, to_field='nid')  # 跟UserInfo的nid进行关联
    user = models.ForeignKey(to="UserInfo", to_field='nid', related_name='n', on_delete=True)       # 跟UserInfo表关联
    nt = models.ForeignKey(to='NewsType', to_field='id', related_name='tn', on_delete=True)    # 关联NewsType表，关联默认的id
    # 引用下面一行代码，就不需要下面的Favor表了，2个一个效果【不采用点赞表Favor】
    favor = models.ManyToManyField(to='UserInfo')  # 默认关联的就是主键
    favor_count = models.IntegerField(default=0)   # 每点赞一次就增加1，同时给顶踩表添加一条数据
    comment_count = models.IntegerField(default=0) # 每评论一次就增加1，同时给评论表添加一条数据


# 点赞表【这里采用manyTomany实现userInfo和News单独关系，所以注释了】
# class Favor(models.Model):
#     user = models.ForeignKey(to='UserInfo', to_field='nid', on_delete=True)
#     news = models.ForeignKey(to='News', to_field='id', on_delete=True)

# 评论表
class Comment(models.Model):
    news = models.ForeignKey(to='News', to_field='id', on_delete=True)
    user = models.ForeignKey(to='UserInfo', to_field='nid', on_delete=True)
    content = models.CharField(max_length=150)
    ctime = models.DateTimeField(auto_now_add=True)
    device = models.CharField(max_length=16, null=True)

# 顶踩表：记录你顶过那个用户的哪条新闻，踩过哪个用户的哪条新闻

终极版：提升速度，增加功能

models.py

####################################以下都是抽屉的代码####################################
from django.db import models
# 记录用户注册的次数
class SendMsg(models.Model):
    nid = models.AutoField(primary_key=True)  # 自定义id名为nid,默认id名是id【固定格式】
    email = models.CharField(max_length=32, unique=True)
    code = models.CharField(max_length=6)
    ctime = models.DateTimeField()
    times = models.IntegerField(default=0)

# 新闻类型
class NewsType(models.Model):
    caption = models.CharField(max_length=16)

# 抽屉的用户表设计
class UserInfo(models.Model):
    nid = models.AutoField(primary_key=True)
    username = models.CharField(max_length=32, unique=True)
    password = models.CharField(max_length=32)
    email = models.CharField(max_length=32, unique=True)
    ctime = models.DateTimeField()

# 新闻表
class News(models.Model):
    # 可以自己创建id，AutoField且primary_key = True【默认id=id】
    title = models.CharField(max_length=64)   # 标题
    summary = models.CharField(max_length=128, null=True)  # [内容，可为空简介]
    url = models.URLField(null=True)
    ctime = models.DateTimeField(auto_now_add=True)
    # 下面2个user效果同，只是写法不同
    # user = models.ForeignKey('UserInfo', on_delete=True, to_field='nid')  # 跟UserInfo的nid进行关联
    user = models.ForeignKey(to="UserInfo", to_field='nid', related_name='n', on_delete=True)  # 跟UserInfo表关联
    # nt = models.ForeignKey(to='NewsType', to_field='id', related_name='tn', on_delete=True)    # 关联NewsType表，关联默认的id
    # 因为内容固定，所以这里直接采用列表的形式了
    news_type_choices = [
        (1, '42区'),
        (2, '段子'),
        (3, '图片'),
        (4, '挨踢1024'),
        (5, '你问我答'),
    ]
    # DjangoAdmin里面会渲染为一个下拉框，这里需要我们自己去写下拉框了
    nt = models.IntegerField(choices=news_type_choices)
    # 引用下面一行代码，就不需要下面的Favor表了，2个一个效果
    favor = models.ManyToManyField(to='UserInfo')  # 默认关联的就是主键
    favor_count = models.IntegerField(default=0)   # 每点赞一次就增加1，同时给顶踩表添加一条数据
    comment_count = models.IntegerField(default=0) # 每评论一次就增加1，同时给评论表添加一条数据

# 点赞表  【这里我们采用many2many实现多对多的关系，此表暂时不用】
# class Favor(models.Model):
#     user = models.ForeignKey(to='UserInfo', to_field='nid', on_delete=True)
#     news = models.ForeignKey(to='News', to_field='id', on_delete=True)

# 评论表
class Comment(models.Model):
    news = models.ForeignKey(to='News', to_field='id', on_delete=True)
    user = models.ForeignKey(to='UserInfo', to_field='nid', on_delete=True)
    content = models.CharField(max_length=150)
    ctime = models.DateTimeField(auto_now_add=True)
    device = models.CharField(max_length=16, null=True)
    # 这里要求父评论只能是数字且是Comment里面的自增ID
    # 要求也能实现反向查找【此时可认为是2个Comment表，但需要添加releat_name，否则就易混乱】
    parent_comment = models.ForeignKey(to="Comment", null=True, on_delete=True, related_name='pc')

# 顶踩表：记录你顶过那个用户的哪条新闻，踩过哪个用户的哪条新闻