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목록Data Science/MongoDB (57)
Scientific Computing & Data Science
Written by cinema4dUpdate items using "$set" modifier : "$set" modifier adds item(s) if the relevant key exists or creates the key when absent. Type the following for data preparation: // drop the current database db.dropDatabase() // define webpage1 var user1 = {"username" : "gchoi", "age" : 37, "sex" : "male"} // insert items into DB db.users.insert(user1) db.users.find() Result: > db.users.fi..
Written by cinema4dSometimes you may want to modify only a certain portion of document. Using update modifiers you can do that by atomic level such as altering, adding or removing keys and even manipulating arrays and embedded documents. Assume that you have three webpages to manage and you are going to update pageviews - automatically increase by 1 when visiting. Type the following for data pre..
Written by cinema4d우선 다음과 같이 데이터를 준비하도록 하자:// user DB "foobar" use foobar // define user1 var user1 = {"username" : "gchoi"} user1.age = 37 user1.relationships = {"friends" : 100, "enemies" : 1} // define user2 var user2 = {"username" : "tjkwak"} user3.age = 31 user2.relationships = {"friends" : 50, "enemies" : 5} // define user3 var user3 = {"username" : "jmpark"} user3.age = 25 user3.relations..
Written by cinema4d다음 코드는 MongoDB에 대한 라이프 사이클의 한 예를 보여주고 있다: // user DB "foobar" use foobar // define user1 var user1 = {"username" : "gchoi"} user1.relationships = {"friends" : 100, "enemies" : 1} // define user2 var user2 = {"username" : "tjkwak"} user2.relationships = {"friends" : 50, "enemies" : 5} // define user3 var user3 = {"username" : "jmpark"} user3.relationships = {"friends" : 10, "en..
Written by cinema4dCreate"title", "content", "date" 키를 갖는 "post" 변수 생성 :> post = {"title" : "My first blog post", ... "content" : "Getting started with MongDB", ... "date" : new Date()} { "title" : "My fist blog post", "content" : "Getting started with MongDB", "date" : ISODate("2014-01-13T14:40:39.232Z") }insert 메써드를 이용하여 "post" 변수를 "blog" 콜렉션에 저장 :> db.blog.insert(post)find 메써드를 입력하면 "blog" 콜렉..
Written by cinema4dMongoDB 서버가 실행된 상태에서 (./mongod) Terminal을 하나 더 실행한 후 MongoDB의 path로 이동하여 다음과 같이 입력한다../mongo MongoDB shell version: 2.4.8 connecting to: test Welcome to the MongoDB shell. For interactive help, type "help". For more comprehensive documentation, see http://docs.mongodb.org/ Questions? Try the support group http://groups.google.com/group/mongodb-user Server has startup warnings:..
Written by cinema4dMac에서 Terminal을 실행하여 MongoDB가 설치된 곳으로 path 이동한다.cd [root_path]/mongodb-osx-x86_64-2.4.8/bin다음과 같이 입력해 본다. (Windows에서는 "mongod.exe"를 실행한다)./mongod ./mongod --help for help and startup options Mon Jan 13 22:52:41.258 [initandlisten] MongoDB starting : pid=674 port=27017 dbpath=/data/db/ 64-bit host=Geol-ui-MacBook-Pro.local Mon Jan 13 22:52:41.259 [initandlisten] Mon Jan 13 22:5..