mongo DB的通常操做

最近接觸了一些mongoDB 。將一些指令操做記錄下來，便於查詢和使用

 

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[root@logs ~]# mongo -u loguser -p log123456 --authenticationDatabase admin
MongoDB shell version: 2.4.10
connecting to: test
> show users
> post = {"title":"My Blog Post","Content":"Here is my blog Post.","Date":new Date()}
{
        "title" : "My Blog Post",
        "Content" : "Here is my blog Post.",
        "Date" : ISODate("2015-02-11T03:12:03.061Z")
}

插入
--插入文檔對象
> db.blog.insert(post)
> post = {"title":"Licz Blog Post","Content":"Here is my blog Post.","Date":new Date()}
{
        "title" : "Licz Blog Post",
        "Content" : "Here is my blog Post.",
        "Date" : ISODate("2015-02-11T03:17:07.219Z")
}
> db.blog.insert(post)

讀取
--讀取集合裏一個文檔
> db.blog.findOne()
{
        "_id" : ObjectId("54dac88dc956bbcbefa8151c"),
        "title" : "My Blog Post",
        "Content" : "Here is my blog Post.",
        "Date" : ISODate("2015-02-11T03:12:03.061Z")
}

--讀取限定文檔數
> db.blog.find().limit(100);
> db.blog.find().limit(100);
{ "_id" : ObjectId("54dac88dc956bbcbefa8151c"), "title" : "My Blog Post", "Content" : "Here is my blog Post.", "Date" : ISODate("2015-02-11T03:12:03.061Z") }
{ "_id" : ObjectId("54dac9b8c956bbcbefa8151d"), "title" : "Licz Blog Post", "Content" : "Here is my blog Post.", "Date" : ISODate("2015-02-11T03:17:07.219Z") }

--讀取全部文檔數
> db.blog.find()
{ "_id" : ObjectId("54dac88dc956bbcbefa8151c"), "title" : "My Blog Post", "Content" : "Here is my blog Post.", "Date" : ISODate("2015-02-11T03:12:03.061Z") }
> db.blog.find().limit(100);
{ "_id" : ObjectId("54dac88dc956bbcbefa8151c"), "title" : "My Blog Post", "Content" : "Here is my blog Post.", "Date" : ISODate("2015-02-11T03:12:03.061Z") }
{ "_id" : ObjectId("54dac9b8c956bbcbefa8151d"), "title" : "Licz Blog Post", "Content" : "Here is my blog Post.", "Date" : ISODate("2015-02-11T03:17:07.219Z") }

更新

--修改變量post,增長comments鍵
> post
{ "title" : "You Blog Post", "Date" : ISODate("2015-02-11T03:18:10.509Z") }
> post.comments=[]
[ ]
> db.blog.update({title:"You Blog Post"},post)
> db.blog.find()
{ "_id" : ObjectId("54dac88dc956bbcbefa8151c"), "title" : "My Blog Post", "Content" : "Here is my blog Post.", "Date" : ISODate("2015-02-11T03:12:03.061Z") }
{ "_id" : ObjectId("54dac9b8c956bbcbefa8151d"), "title" : "Licz Blog Post", "Content" : "Here is my blog Post.", "Date" : ISODate("2015-02-11T03:17:07.219Z") }
{ "_id" : ObjectId("54dac9f8c956bbcbefa8151e"), "title" : "You Blog Post", "Date" : ISODate("2015-02-11T03:18:10.509Z"), "comments" : [ ] }

刪除

--刪除title限定條件的文檔
> db.blog.remove({title:"You Blog Post"})
> db.blog.find()
{ "_id" : ObjectId("54dac88dc956bbcbefa8151c"), "title" : "My Blog Post", "Content" : "Here is my blog Post.", "Date" : ISODate("2015-02-11T03:12:03.061Z") }
{ "_id" : ObjectId("54dac9b8c956bbcbefa8151d"), "title" : "Licz Blog Post", "Content" : "Here is my blog Post.", "Date" : ISODate("2015-02-11T03:17:07.219Z") }
> 

MongoDB使用技巧

--help幫助命令
> help
        db.help()                    help on db methods
        db.mycoll.help()             help on collection methods
        sh.help()                    sharding helpers
        rs.help()                    replica set helpers
        help admin                   administrative help
        help connect                 connecting to a db help
        help keys                    key shortcuts
        help misc                    misc things to know
        help mr                      mapreduce


        show dbs                     show database names
        show collections             show collections in current database
        show users                   show users in current database
        show profile                 show most recent system.profile entries with time >= 1ms
        show logs                    show the accessible logger names
        show log [name]              prints out the last segment of log in memory, 'global' is default
        use <db_name>                set current database
        db.foo.find()                list objects in collection foo
        db.foo.find( { a : 1 } )     list objects in foo where a == 1
        it                           result of the last line evaluated; use to further iterate
        DBQuery.shellBatchSize = x   set default number of items to display on shell
        exit                         quit the mongo shell

--特殊集合名處理
若是集合名剛好是和數據庫類的一個屬性名相同，可使用db.getCollection進行訪問

> db.version
function (){
    return this.serverBuildInfo().version;
}
> db.getCollection("version")
test.version