标签：got mode 完全 翻译 lis god pre pytho tor
最近在写Django项目，使用的是mongodb，虽然Django不支持NoSQL，但是mongoengine可以帮助我们像ORM一样在Django项目中去操作mongodb
推荐一个可视化工具 Robo 3T
这里贴几个我觉得比较有帮助的帖子，特别是在一对一，一对多的引用
先放mongoengine的官方文档
http://docs.mongoengine.org/tutorial.html
这是翻译的中文文档，版本比较老，对应官方文档看
https://www.cnblogs.com/fillim/p/4864523.html
https://blog.csdn.net/qq_38890497/article/details/80392846
https://www.linuxzen.com/mongoengineshi-yong-bi-ji.html
1. 首先修改settings.py, 原来DATABASES完全不用去管它了, 全部设为空串就好, 然后在文件里加上下面的内容
如有必要可在INSTALLED_APPS中注册一下
#settings.py from mongoengine import connect connect(‘DB_NAME‘)
#####ReferenceField 引用字段
class Org(Document): owner = ReferenceField(‘User‘) class User(Document): org = ReferenceField(‘Org‘, reverse_delete_rule=CASCADE) User.register_delete_rule(Org, ‘owner‘, DENY)
2.创建集合
# model.py
from mongoengine import *
from datetime import datetime,timedeltaclass User(Document):
name = StringField(max_length=32)
age = IntField()
password = StringField(max_length=32引用查询
from mongoengine import * from datetime import datetime,timedelta from ReferencenField import * import json from bson import json_util connect(‘mongotest‘) # 一对一引用查询 author = User.objects.filter(name="John Smith")[0] author2 = Page.objects.filter(content="test3 Page").first().author content = Page.objects.filter(author=a) content_ = Page.objects(author__in=[a]) print(author.name) print(author2.name) print(content_) for i in content: print(i.author.name,‘:‘,i.content) # 一对多引用查询 John_Smith = User.objects.filter(name="John Smith")[0] llz = User.objects.filter(name=‘lilinze‘)[0] # print(llz.name) print(‘查询作者是llz的Page‘) pages = Page.objects.filter(author=llz) for i in pages : print(i.content) print(‘查询作者是John_Smith的Page‘) pages = Page.objects.filter(author=John_Smith) for i in pages: print(i.content)
嵌入
from mongoengine import * from datetime import datetime,timedelta from bson.objectid import ObjectId connect(‘mongotest‘) class User(Document): name = StringField() pages= StringField() time = DateTimeField() class Tags(EmbeddedDocument): name = StringField() date = DateTimeField(default=datetime.now()) class Page(Document): content = StringField() quadrant =StringField() #两种嵌入写法 # tags = ListField(EmbeddedDocumentField(‘Tags‘)) tags = EmbeddedDocumentListField(‘Tags‘) author = ReferenceField(User,reverse_delete_rule = CASCADE) user = User.objects.get(name=‘llz‘) tag = Tags(name=‘123‘) tag1 = Tags(name=‘456‘) page = Page(content=‘嵌入1‘,quadrant=‘北面‘,tags=[tag,tag1],author=user) page.save()
Objectid转为字符串
John = User.objects.filter(name="John Smith")[0].id print(John) dict = {‘John‘:John} print(‘dict:‘,dict) # j_son = json.dumps(dict) print(‘--------ObjectId转为Json----------‘) data = json_util.dumps(John) print(‘data:‘,data) print(‘type:‘,type(data)) print(‘--------Json--to--dict----------‘) print(‘********************************‘) dd = json.loads(data) print(dd) print(type(dd)) print(dd[‘$oid‘]) print(type(dd[‘$oid‘])) dd_ = {‘$oid‘:dd[‘$oid‘]} jdd_ = json.dumps(dd_) objecdd_ = json_util.loads(jdd_) print(objecdd_) print(type(objecdd_)) print(‘********************************‘) print(‘--------Json--to--ObjectId----------‘) ObjectId = json_util.loads(data) print(ObjectId) print(type(ObjectId))
字符串转objectID
from bson.objectid import ObjectId a = ‘5bfe034c07aae823b440fdcf‘ # 判断是否符合object格式 if ObjectId.is_valid(a): A = ObjectId(a) print(A) # <class ‘bson.objectid.ObjectId‘>,id是bson print(isinstance(A,ObjectId)) # True
create() ，存入一个新对象，并返回
llzid = User.objects.create(name=‘zzz‘) print(llzid.name) >>>zzz
标签：got mode 完全 翻译 lis god pre pytho tor
原文地址：https://www.cnblogs.com/yangyangming/p/11516121.html
