class Book(models.Model):
  nid = models.AutoField(primary_key=True) # 自增id(可以不寫(xiě)，默認(rèn)會(huì)有自增id)
  title = models.CharField(max_length=32)
  publishDdata = models.DateField() # 出版日期
  price = models.DecimalField(max_digits=5, decimal_places=2) # 一共5位，保留兩位小數(shù)

  #一個(gè)出版社有多本書(shū)，關(guān)聯(lián)字段要寫(xiě)在多的一方
  # 不用命名為publish_id，因?yàn)閐jango為我們自動(dòng)就加上了_id
  publish = models.ForeignKey("Publish") #foreignkey（表名）建立的一對(duì)多關(guān)系
  # publish是實(shí)例對(duì)象關(guān)聯(lián)的出版社對(duì)象
  authorlist = models.ManyToManyField("Author") #建立的多對(duì)多的關(guān)系
  def __str__(self): #__str__方法使用來(lái)吧對(duì)象轉(zhuǎn)換成字符串的，你返回啥內(nèi)容就打印啥
    return self.title
class Publish(models.Model):
  #不寫(xiě)id的時(shí)候數(shù)據(jù)庫(kù)會(huì)自動(dòng)給你增加自增id
  name =models.CharField(max_length=32)
  addr = models.CharField(max_length=32)

  def __str__(self):
    return self.name
class Author(models.Model):
  name = models.CharField(max_length=32)
  age = models.IntegerField()

class AuthorDeital(models.Model):
  tel = models.IntegerField()
  addr = models.CharField(max_length=32)
  author = models.OneToOneField("Author") #建立的一對(duì)一的關(guān)系

wordNum = models.IntegerField（default=0）  

LOGGING = {
  'version': 1,
  'disable_existing_loggers': False,
  'handlers': {
    'console':{
      'level':'DEBUG',
      'class':'logging.StreamHandler',
    },
  },
  'loggers': {
    'django.db.backends': {
      'handlers': ['console'],
      'propagate': True,
      'level':'DEBUG',
    },
  }
}　　

YEAR_IN_SCHOOL_CHOICES = (
  ('FR', 'Freshman'),
  ('SO', 'Sophomore'),
  ('JR', 'Junior'),
  ('SR', 'Senior'),
  ('GR', 'Graduate'),
)

from django.db import models

class Person(models.Model):
  SHIRT_SIZES = (
    ('S', 'Small'),
    ('M', 'Medium'),
    ('L', 'Large'),
  )
  name = models.CharField(max_length=60)
  shirt_size = models.CharField(max_length=1, choices=SHIRT_SIZES)


>>> p = Person(name="Fred Flintstone", shirt_size="L")
>>> p.save()
>>> p.shirt_size
'L'
>>> p.get_shirt_size_display()
'Large

 # 一對(duì)多的添加
  # 方式一:如果是這樣直接指定publish_id字段去添加值，前提是你的主表里面必須有數(shù)據(jù)
  # 主表：沒(méi)有被關(guān)聯(lián)的（因?yàn)閎ook表是要依賴于publish這個(gè)表的）也就是publish表
  # 子表：關(guān)聯(lián)的表
  models.Book.objects.create(title="追風(fēng)箏的人",publishDdata="2015-5-8",price="111",publish_id=1)
  # 方式二:推薦
  pub_obj = models.Publish.objects.filter(name="人民出版社")[0]
  print(pub_obj)
  models.Book.objects.create(title = "簡(jiǎn)愛(ài)",publishDdata="2000-6-6",price="222",publish=pub_obj)

  # 方式三：save
  pubObj= models.Publish.objects.get(name="人民出版社") #只有一個(gè)的時(shí)候用get,拿到的直接就是一個(gè)對(duì)象
  bookObj = models.Book(title = "真正的勇士",publishDdata="2015-9-9",price="50",publish=pubObj)
  bookObj.save()

# 多對(duì)多的添加的兩種方式
  # 方式一：
  # 先創(chuàng)建一本書(shū)：
  pub_obj=models.Publish.objects.filter(name="萬(wàn)能出版社").first()
  book_obj = models.Book.objects.create(title="醉玲瓏",publishDdata="2015-4-10",price="222",publish=pub_obj)
  # #通過(guò)作者的名字django默認(rèn)找到id
  haiyan_obj = models.Author.objects.filter(name="haiyan")[0]
  egon_obj = models.Author.objects.filter(name="egon")[0]
  xiaoxiao_obj = models.Author.objects.filter(name="xiaoxiao")[0]
  # 綁定多對(duì)多的關(guān)系、
  book_obj.authorlist.add(haiyan_obj, egon_obj, xiaoxiao_obj)

  # 方式二=========,查出所有的作者
  pub_obj = models.Publish.objects.filter(name="萬(wàn)能出版社").first()
  book_obj = models.Book.objects.create(title="醉玲瓏", publishDdata="2015-4-10", price="222", publish=pub_obj)
  authers = models.Author.objects.all()
  # #綁定多對(duì)多關(guān)系
  book_obj.authorlist.add(*authers)

# 解除多對(duì)多的關(guān)系（remove） book_obj=models.Book.objects.filter(title="醉玲瓏").last() #找到書(shū)對(duì)象 authers=models.Author.objects.filter(id__lt=3) #找到符合條件的作者對(duì)象 book_obj.authorlist.remove(*authers) #因?yàn)榍宄氖嵌鄺l，得加個(gè)*

  # 清除關(guān)系方法(clear)
  book_obj= models.Book.objects.filter(title="紅樓夢(mèng)")
  for book_obj_item in book_obj:#把所有紅樓夢(mèng)的都給清空了
    book_obj_item.authorlist.clear()

 # 一對(duì)一的查詢
  # 正向查詢：手機(jī)號(hào)為13245的作者的姓名
  deital_obj = models.AuthorDeital.objects.filter(tel="13245").first()
  print(deital_obj.author.name)
  # 反向查詢：查詢egon的手機(jī)號(hào)
  egon_obj = models.Author.objects.filter(name="egon").first()
  print(egon_obj.authordeital.tel)

 # 正向查詢：查詢真正的勇士這本書(shū)的出版社的地址
  book_obj = models.Book.objects.filter(title="真正的勇士")[0] # 找對(duì)象
  print("======", book_obj.publish) # 拿到的是關(guān)聯(lián)出版社的對(duì)象
  print(book_obj.publish.addr)
 # 反向查詢：查詢?nèi)嗣癯霭嫔绯霭孢^(guò)的所有的書(shū)的價(jià)格和名字
  pub_obj = models.Publish.objects.filter(name="人民出版社")[0]
  book_dic = pub_obj.book_set.all().values("price", "title")[0]
  print(book_dic)
  print(book_dic["price"])
  # 查詢 人民出版社出版過(guò)的所有書(shū)籍

  publish=models.Publish.objects.get(name="人民出版社")  #get得到的直接是一個(gè)對(duì)象，不過(guò)get只能查看有一條記錄的

  book_list=publish.book_set.all() # 與人民出版社關(guān)聯(lián)的所有書(shū)籍對(duì)象集合

   for book_obj in book_list:

   print(book_obj.title)

 # 多對(duì)多的查詢
  # 正向查詢：查詢追風(fēng)箏的人的這本書(shū)的所有的作者的姓名和年齡
  book_obj = models.Book.objects.filter(title="紅樓夢(mèng)")[0]
  print(book_obj.authorlist.all().values("name", "age")) # 這本書(shū)關(guān)聯(lián)的所有作者對(duì)象的集合
  # 反向查詢：查詢作者是haiyan的這個(gè)人出了哪幾本書(shū)的信息
  haiyan_obj = models.Author.objects.filter(name="haiyan")[0]
  print("bookinfo====", haiyan_obj.book_set.all().first().title) # 與該作者關(guān)聯(lián)的所有書(shū)對(duì)象的集合
  return HttpResponse("ok")

# 查詢 人民出版社出版過(guò)的所有書(shū)籍
  publish=Publish.objects.get(name="人民出版社") 
  book_list=publish.bookList.all() # 與人民出版社關(guān)聯(lián)的所有書(shū)籍對(duì)象集合

# 基于雙下劃線的方式查詢1================一對(duì)多
  # 第一種查法
  ret = models.Publish.objects.filter(name="人民出版社").values("book__price","book__title")
  print(ret)
  # 第二種查法
  ret2 = models.Book.objects.filter(publish__name="人民出版社").values("price","title")
  print(ret2)

  第一種查法
  ret = models.Book.objects.filter(title="linux").values("publish__addr")
  print(ret)
  第二種查法
  ret2 = models.Publish.objects.filter(book__title="linux").values("addr")
  print(ret2)

#方式一  
  ret = models.Author.objects.filter(name="egon").values("book__title")
  print(ret)
#方式二：兩種方式也就是邏輯不一樣
  ret2 = models.Book.objects.filter(authorlist__name="egon").values("title")
  print(ret2)

  # 方式一：
  author_obj = models.AuthorDeital.objects.filter(tel__startswith="151").first()
  print(author_obj.author.book_set.all().values("title","publish__name"))
  # 方式二：
  ret = models.Book.objects.filter(authorlist__author_deital__tel__startswith="151").values("title","publish__name")
  print(ret)