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