MongoDB Common operations

relational database nouns vs. MongoDB:

relational database	Mongodb
Database	Database
Table	Collection
Row	Document
Index	Index
Join	Lookup
Foreign Key	Reference
multi-table Transaction	Single Document transaction

The command line uses MongoDB

Insert your First Data

> Show Databases

Local 0.000GB

> Use test #切换到test数据库, if not, create a new

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"}

Using MongoDB in Python

Import pymongo## client defaults to localhost and port 27017. eg  mongoclient (' localhost ',  27017) Client = pymongo. Mongoclient () #连接到本地数据库blogDatabase  = client[  "blog"  ]     # Switch to the blog database userscollection = blogdatabase[  "users"  ]    # Switch to Userscollectionuserscollection.insert_one ( {  "username"  :  "jdrumgoole", "Password"   :  "Top secret", "Lang"  :  "EN"  }) #插入一条数据user  = userscollection.find_one () # Find the latest piece of data print ( user ) articlescollection = blogdatabase[  "articles"  ]author  =  "Jdrumgoole" article = {  "title"  :  "this is my first " Post "," Body " : " The is the longer body text for my blog  post. we can add lots of text here. "," author" : author," tags " : [ " Joe ", " General ", " Ireland ", " admin " ]}##  lets check if our author exists#if userscollection.find_one ( {  " Username " : AUTHOR })  :articlescollection.insert_one ( article ) else:raise  ValueError (  "Author %s does not exist"  % author )

This article is from the "Danielqu" blog, make sure to keep this source http://qujunorz.blog.51cto.com/6378776/1858528

MongoDB Common operations