django中怎么操作model

今天就跟大家聊聊有关django中怎么操作model，可能很多人都不太了解，为了让大家更加了解，小编给大家总结了以下内容，希望大家根据这篇文章可以有所收获。

单表操作

增加数据

auther_obj = {"auther_name":"崔皓然","auther_age":1} models.auther.objects.create(  **auther_obj )

models.auther.objects.create(  auther_name="周雍博",  auther_age=4 )

obj = models.auther(  auther_name="崔洪艳",  auther_age=29 ) obj.save()

obj = models.auther(  auther_name = "王仙枝",  auther_age = "50" ) obj.save()

删除数据

models.auther.objects.filter(auther_name="崔洪艳")[0].delete()

一对多操作

增加数据

a_obj = models.auther.objects.get(id=1)     models.book.objects.create(  book_name = "python课程1",  book_price = 12,  book_auther = a_obj )

a_obj = models.auther.objects.get(id=5)   models.book.objects.create(  book_name = "java课程1",  book_price = 13,  book_auther_id = a_obj.id )

a_obj = models.auther.objects.get(id=2)   book_dict = {  "book_name":"python课程2",  "book_price":14,  "book_auther_id":a_obj.id }   obj = models.book.objects.create(  **book_dict )

a_obj = models.auther.objects.get(id=4)   book_dict = {  "book_name":"java课程2",  "book_price":15,  "book_auther":a_obj }   models.book.objects.create(  **book_dict )

一对多正向查询

# 查询id为2的书的所有作者的信息 obj = models.book.objects.get(id=2)   print(obj.book_auther.auther_name) print(obj.book_auther.auther_age)   obj = models.book.objects.filter(id=2).values("book_name","book_price","book_auther__id","book_auther__auther_name","book_auther__auther_age")   print(obj)

# 查询id为2的作者的出版的书   obj = models.book.objects.filter(book_auther_id=2).values("book_name","book_price","book_auther__id","book_auther__auther_name","book_auther__auther_age") print(obj)     obj = models.book.objects.get(book_auther_id=2) print(obj.book_auther.auther_age) print(obj.book_auther.auther_name) print(obj.book_name)

一对多反向查询

# 查看出版社出版的书   obj = models.auther.objects.filter(id=2).values("auther_name","auther_age","book__book_name") print(obj)   obj = models.auther.objects.get(id=2).book_set.values("book_name","book_price","book_auther__id","book_auther__auther_name","book_auther__auther_age") print(obj)

多对多操作

增加数据

b1 = models.book.objects.get(id=1) b2 = models.book.objects.get(id=2) b4 = models.book.objects.get(id=4) b5 = models.book.objects.get(id=5) models.publish.objects.get(id=1).publish_book.add(  b1,b2 )

book_list = [b1,b2]   models.publish.objects.get(id=2).publish_book.add(  *book_list )

更新数据

book_list = [b1,b2,b4,b5] models.publish.objects.get(id=1).publish_book.set(book_list)

移除数据

models.publish.objects.get(id=1).publish_book.remove(b1)   book_list = [b2, ]   models.publish.objects.get(id=1).publish_book.remove(*book_list)　　

正向查询

obj = models.publish.objects.get(id=1).publish_book.values("book_name","publish__publish_name") print(obj)   obj = models.publish.objects.filter(id=1).values("publish_name","publish_book__book_name") print(obj)

反向添加数据

p1 = models.publish.objects.get(id=1) p2 = models.publish.objects.get(id=2) p3 = models.publish.objects.get(id=3) b1.publish_set.add(p1,p2,p3)

反向删除数据

b1.publish_set.remove(p1)

反向更新数据，把remove替换为set就可以了

反向查询

obj = models.book.objects.get(id=1).publish_set.values("publish_name","publish_book__book_name")

model中多表关系和参数 

多对多

一对一

model操作

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