class?Author(models.Model):'''作者表'''name?=?models.CharField(max_length=32)book?=?models.ManyToManyField(to="Book")#?def?__str__(self):#?????return?self.nameclass?Book(models.Model):'''書表'''title?=?models.CharField(max_length=32)price?=?models.CharField(max_length=32)publish?=?models.ForeignKey(to="Publish")#?def?__str__(self):#?????return?self.title#egon出版過的書的出版社信息class?Publish(models.Model):'''出版社'''address?=?models.CharField(max_length=32)#?def?__str__(self):#?????return?self.address#?author?=?models.Author.objects.all()???#查詢到所有的作者對象queryset???author多對多book #?book?=?models.Book.objects.all()??#?查詢到所有的書籍對象queryset???????book多對一publish #?publish?=?models.Publish.objects.all()???#查詢到所有的出版社對象queryset #?#================================================字段查詢============================================================ #?for?te?in?author: #?????print("======author",te.name)??????#查詢自己表內的信息 #?????print("======author_book",te.book.first().title)??????#通過自己查找多對多的字段 #?????print("======author_book_publish",te.book.first().publish.address)??????#通過自己查找多對多的字段,然后查找多對一字段 #?for?te?in?book: #?????print("========tetetet",te) #?????print("======book",te.title,te.price)??????#查詢自己表內的信息 #?????print("========book_publish",te.publish.address)?????#通過自己查詢多對一的出版社表 #?????print("==========book_author",te.author_set.first())?????#通過自己反向查找作者姓名 #?for?te?in?publish: #?????print("=====publish",te.address)??????#查詢自己表內的信息 #?????print("=====publish_book",te.book_set.first().title) #?????print("=======publish_book_author",te.book_set.first().author_set.first()) # # #?author_book_publish?=?author.first().book.all().first().title #?print("==================================",author_book_publish) #?#============================================雙下劃線正向查詢===========================================================#?author?=?models.Author.objects.all()??#?查詢到所有的作者對象queryset???author多對多book #?book?=?models.Book.objects.all()??#?查詢到所有的書籍對象queryset???????book多對一publish #?publish?=?models.Publish.objects.all()??#?查詢到所有的出版社對象queryset#?book_title?=?author.filter(name="egon").values("book__title")??????#在author表中查book標的title #?book_price?=?author.filter(name="egon").values("book__price")??????#在author表中查book表的price #?book_publish_address?=?author.filter(name="egon").values("book__publish__address")???#在author表中二次關聯查找出版社 #?print("============book_title|book_price",book_title,book_price) #?print("============book_publish_addredd",book_publish_address)#?#============================================雙下劃線反向查詢=========================================================== #?book_title?=?publish.filter(address="北京").values("book__title") #?book_price?=?publish.filter(address="北京").values("book__price") #?publish_book?=?publish.filter(address="北京").values("book__author") #?publish_author_book?=?publish.filter(address="北京").values("book__author__name") #?print("============book_title|book_price",book_title,book_price) #?print("============publish_book",publish_book) #?print("============publish_author_book",publish_author_book)########################################################################################################################

轉載于:https://blog.51cto.com/52770825/1980887

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