MongoDB数据库基本操作

查看当前数据库

MongoDB shell version：1.8.1

connecting to：test

> db

test

查看全部数据库列表

>show dbs

ChatRoom    0.03125GB

admin       (empty)

local       (empty)

 

切换数据库

>use ChatRoom

switched to db ChatRoom

>db

ChatRoom

删除数据库

>db

ChatRoom

>show dbs

ChatRoom    0.03125GB

admin       (empty)

local       (empty)

>db.dropDatabase()

{"dropped":"ChatRoom","ok":1}

>show dbs

admin       (empty)

local       (empty)

 MongoDB帮助主题help

> help

        db.help()                    help on db methods

        db.mycoll.help()             help on collection methods

        rs.help()                    help on replica set methods

        help connect                 connecting to a db help

        help admin                   administrative help

        help misc                    misc things to know

        help mr                      mapreduce help



        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

        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 furtheriterate

        DBQuery.shellBatchSize = x   set default number of items to display on shell

        exit                         quit the mongo shell

> db.help()

DB methods:

        db.addUser(username, password[, readOnly=false])

        db.auth(username, password)

        db.cloneDatabase(fromhost)

        db.commandHelp(name) returns the help for the command

        db.copyDatabase(fromdb, todb, fromhost)

        db.createCollection(name, { size : ..., capped : ..., max : ... } )

        db.currentOp() displays the current operation in the db

        db.dropDatabase()

        db.eval(func, args) run code server-side

        db.getCollection(cname) same as db['cname'] or db.cname

        db.getCollectionNames()

        db.getLastError() - just returns the err msg string

        db.getLastErrorObj() - return full status object

        db.getMongo() get the server connection object

        db.getMongo().setSlaveOk() allow this connection to read from the nonmaster member of a replica pair

        db.getName()

        db.getPrevError()

        db.getProfilingLevel() - deprecated

        db.getProfilingStatus() - returns if profiling is on and slow threshold

        db.getReplicationInfo()

        db.getSiblingDB(name) get the db at the same server as this one

        db.isMaster() check replica primary status

        db.killOp(opid) kills the current operation in the db

        db.listCommands() lists all the db commands

        db.printCollectionStats()

        db.printReplicationInfo()

        db.printSlaveReplicationInfo()

        db.printShardingStatus()

        db.removeUser(username)

        db.repairDatabase()

        db.resetError()

        db.runCommand(cmdObj) run a database command.  if cmdObj is a string, turns it into { cmdObj : 1 }

        db.serverStatus()

        db.setProfilingLevel(level,<slowms>) 0=off 1=slow 2=all

        db.shutdownServer()

        db.stats()

        db.version() current version of the server

        db.getMongo().setSlaveOk() allow queries on a replication slave server