django的model操作汇整详解
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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