mongoDB操作命令，摘自官方helper

help                         show helpshow dbs                     show database namesshow collections             show collections in current databaseshow users                   show users in current databaseshow profile                 show most recent system.profile entries with time >= 1msuse <db name>                set curent database to <db name>db.addUser (username, password)db.removeUser(username)db.cloneDatabase(fromhost)db.copyDatabase(fromdb, todb, fromhost)db.createCollection(name, { size : ..., capped : ..., max : ... } )db.getName()db.dropDatabase()// runs the collstats] command on each collection in the databasedb.printCollectionStats()db.currentOp() displays the current operation in the dbdb.killOp() kills the current operation in the dbdb.getProfilingLevel()db.setProfilingLevel(level) 0=off 1=slow 2=alldb.getReplicationInfo()db.printReplicationInfo()db.printSlaveReplicationInfo()db.repairDatabase()db.version() current version of the serverdb.shutdownServer()

db.foo.drop() drop the collection
db.foo.dropIndex(name)
db.foo.dropIndexes()
db.foo.getIndexes()
db.foo.ensureIndex(keypattern,options) - options object has these possible
fields: name, unique, dropDups

db.foo.find( [query] , [fields]) - first parameter is an optional
query filter. second parameter
is optional
set of fields to return.
e.g. db.foo.find(
{ x : 77 } ,
{ name : 1 , x : 1 } )
db.foo.find(...).count()
db.foo.find(...).limit(n)
db.foo.find(...).skip(n)
db.foo.find(...).sort(...)
db.foo.findOne([query])

db.foo.getDB() get DB object associated with collection

db.foo.count()
db.foo.group( { key : ..., initial: ..., reduce : ...[, cond: ...] } )

db.foo.renameCollection( newName ) renames the collection

db.foo.stats()
db.foo.dataSize()
db.foo.storageSize() - includes free space allocated to this collection
db.foo.totalIndexSize() - size in bytes of all the indexes
db.foo.totalSize() - storage allocated for all data and indexes
db.foo.validate() (slow)

db.foo.insert(obj)
db.foo.update(query, object[, upsert_bool])
db.foo.save(obj)
db.foo.remove(query) - remove objects matching query
remove({}) will remove all