关系型数据库名词与MongoDB对比：

关系数据库MongoDBDatabaseDatabaseTableCollectionRowDocumentIndexIndexJoinLookupForeign KeyReferenceMulti-table transactionSingle document transaction


命令行使用MongoDB

插入你的第一数据

> show databases

local 0.000GB

> use test #切换到test数据库，如果没有则新建

switched to db test

> show databaseslocal 0.000GB

> db.demo.insert( { "key" : "value" } )WriteResult({ "nInserted" : 1 })

> show databaseslocal 0.000GBtest 0.000GB

> show collectionsdemo

> db.demo.findOne(){ "_id" : ObjectId("573af7085ee4be80385332a6"), "key" : "value" }


python中使用MongoDB

importpymongo##clientdefaultstolocalhostandport27017.egMongoClient('localhost',27017)client=pymongo.MongoClient()#连接到本地数据库blogDatabase=client["blog"]#切换到blog数据库usersCollection=blogDatabase["users"]#切换到usersCollectionusersCollection.insert_one({"username":"jdrumgoole","password":"topsecret","lang":"EN"})#插入一条数据user=usersCollection.find_one()#查找最新的一条数据print(user)articlesCollection=blogDatabase["articles"]author="jdrumgoole"article={"title":"Thisismyfirstpost","body":"Theisthelongerbodytextformyblogpost.Wecanaddlotsoftexthere.","author":author,"tags":["joe","general","Ireland","admin"]}##Letscheckifourauthorexists#ifusersCollection.find_one({"username":author}):articlesCollection.insert_one(article)else:raiseValueError("Author%sdoesnotexist"%author)