MongoDB帮助信息：db方法，collection方法

 

mongos> db.help()
DB methods:
        db.addUser(username, password[, readOnly=false])
        db.adminCommand(nameOrDocument) - switches to 'admin' db, and runs command [ just calls db.runCommand(...) ]
        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 currently executing operations in the db
        db.dropDatabase()
        db.eval(func, args) run code server-side
        db.fsyncLock() flush data to disk and lock server for backups
        db.fsyncUnlock() unlocks server following a db.fsyncLock()
        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 queries on a replication slave server
        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.hostInfo() get details about the server's host
        db.isMaster() check replica primary status
        db.killOp(opid) kills the current operation in the db
        db.listCommands() lists all the db commands
        db.loadServerScripts() loads all the scripts in db.system.js
        db.logout()
        db.printCollectionStats()
        db.printReplicationInfo()
        db.printShardingStatus()
        db.printSlaveReplicationInfo()
        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.setVerboseShell(flag) display extra information in shell output
        db.shutdownServer()
        db.stats()
        db.version() current version of the server
mongos>

 

mongos> db.myCollection.help()
DBCollection help
        db.myCollection.find().help() - show DBCursor help
        db.myCollection.count()
        db.myCollection.copyTo(newColl) - duplicates collection by copying all documents to newColl; no indexes are copied.
        db.myCollection.convertToCapped(maxBytes) - calls {convertToCapped:'myCollection', size:maxBytes}} command
        db.myCollection.dataSize()
        db.myCollection.distinct( key ) - e.g. db.myCollection.distinct( 'x' )
        db.myCollection.drop() drop the collection
        db.myCollection.dropIndex(index) - e.g. db.myCollection.dropIndex( "indexName" ) or db.myCollection.dropIndex( { "indexKey" : 1 } )
        db.myCollection.dropIndexes()
        db.myCollection.ensureIndex(keypattern[,options]) - options is an object with these possible fields: name, unique, dropDups
        db.myCollection.reIndex()
        db.myCollection.find([query],[fields]) - query is an optional query filter. fields is optional set of fields to return. e.g. db.myCollection.find( {x:77} , {name:1, x:1} )
        db.myCollection.find(...).count()
        db.myCollection.find(...).limit(n)
        db.myCollection.find(...).skip(n)
        db.myCollection.find(...).sort(...)
        db.myCollection.findOne([query])
        db.myCollection.findAndModify( { update : ... , remove : bool [, query:{}, sort: {}, 'new': false] } )
        db.myCollection.getDB() get DB object associated with collection
        db.myCollection.getIndexes()
        db.myCollection.group( { key : ..., initial: ..., reduce : ...[, cond: ...] } )
        db.myCollection.insert(obj)
        db.myCollection.mapReduce( mapFunction , reduceFunction , <optional params> )
        db.myCollection.remove(query)
        db.myCollection.renameCollection( newName , <dropTarget> ) renames the collection.
        db.myCollection.runCommand( name , <options> ) runs a db command with the given name where the first param is the collection name
        db.myCollection.save(obj)
        db.myCollection.stats()
        db.myCollection.storageSize() - includes free space allocated to this collection
        db.myCollection.totalIndexSize() - size in bytes of all the indexes
        db.myCollection.totalSize() - storage allocated for all data and indexes
        db.myCollection.update(query, object[, upsert_bool, multi_bool]) - instead of two flags, you can pass an object with fields: upsert, multi
        db.myCollection.validate( <full> ) - SLOW
        db.myCollection.getShardVersion() - only for use with sharding
        db.myCollection.getShardDistribution() - prints statistics about data distribution in the cluster
        db.myCollection.getSplitKeysForChunks( <maxChunkSize> ) - calculates split points over all chunks and returns splitter function