mongo database wiki

I. Overview This blog is about how MONGO db imports and exports data, as well as backup data. The service side of MONGO DB needs to be opened in order to operate. Second, export. the export of MongoDB is very simple open cmd input below command mongoexport-d foobar-c persons-o D:/persons.json

Tags: also requires thread err read Shell Mon ref for SOCThe error message is as follows: [Email protected] bin]# MONGOMongoDB Shell version V3.4.6-22-ga109a23Connecting to:mongodb://127.0.0.1:270172017-10-16t10:57:28.624+0800 W NETWORK [Thread1] Failed to connect to 127.0.0.1:27017, in (checking socket for error after Poll), Reason:connection refused2017-10-16t10:57:28.625+0800 E QUERY [thread1] error:couldn ' t connect to server 127.0.0.1:27017, connection attempt faile B |[Email protected]/

()Score = Selector.xpath ('//[@id = "Interest_sectl"]/div/div[2]/strong/text () ') [0]Print (Name,author,style,time,publisher,score)info = {' Name ': Name,' Author ': Author,' Style ': style,' Time ': Time,' publisher ':p ublisher,' Score ': Score}Musictop.insert_one (Info) if __name__ = = ' __main__ ':URLs = [' https://music.douban.com/top250?start={} ', Format (str (i)) for I in Range (0,250,25)]For URL in URLs:Get_url_music (URL)Time.sleep (2)Issue: Various

2", Pymongo. Descending)]):Print(u)#another way to sort forUinchDb.users.find ({"name":"User9"}, sort=[['name', 1],['Sex', 1]], fields = ["name"," Age",'Sex']): Print(u)#Combination notationSmall examples of scenarios used in FOF projects:ImportPymongoImportdatetime fromPymongoImportmongoclientconnection= Mongoclient ('localhost') DB=Connection.fofstock_cache=Db.stock_cache#post = {"20160301": "Mike", "text": "My First blog post!", "tags": ["MongoDB", "Python", "Pymongo"], "date": Datetime.d

Mongodb:https://www.mongodb.com/download-center#communityThe native installation directory is as follows:The configuration steps are as follows:1. Create a new folder data (a folder called DB in the folder), new folder log (new Mongodb.log file)2. Create a new mongod.conf file with the following file configurationDBPath = D:\install_pack\mongodb\data\dblogpath = D:\install_pack\mongodb\log\mongodb.loglogappend = Trueport = 270173. Open DOS window in bin directory execute command: mongod-fd:\inst

Db. Gprs_product_his_fee.find ({"Condition field": "412171211145135"},{_id:0})Db. Gprs_product_his_fee.find ({"Condition field": "412171211145135"},{_id:0, "query Field 1": 1, "query Field 1": 1, "query Field 3": 1, "query field 4": 1, " Query Field 5 ": 1," query field 6 ": 1})OrDb. Gprs_product_his_fee.find ({"Condition field": "412171211145135"},{"query Field 1": 1, "query Field 2": 1, "query Field 3": 1, "query field 4": 1, "query field 5": 1, "query field 6 ": 1},{_id:0})

Help #mongodb支持的命令Show DBS #查看所有数据库Use testDB #查看当前连接在哪个数据库Show Collections #查看所有的collectionDb.help () #当前数据库支持哪些方法Db.user.help () #当前数据库下的表或者表collection支持的方法Db.foo.find () #查找所有Db.foo.findOne () #查找一条记录Db.foo.find ({' msg ': ' Hello 1 '}). Limit #根据条件检索10条记录Db.mail_addr.drop () #删除collectionDb.dropdatabase () #删除当前的数据库Db.foo.remove ({' yy ': 5}) #删除yy =5 recordsDb.foo.remove () #删除所有的记录#存储嵌套的对象Db.foo.save ({' name ': ' Ysz ', ' address ': {' city ': ' Beijing ', ' Post ': 100096}, ' phone ': [1