如果想查看当前连接在哪个数据库下面,可以直接输入dbCODE:dbAdmin想切换到test数据库下面CODE:usetestswitchedtodbtestdbTest想查看test下有哪些表或者叫collection,可以输入CODE:showcollectionssystem.indexesuser想知道mong
如果想查看当前连接在哪个数据库下面,可以直接输入db
CODE:
> db
Admin想切换到test数据库下面
CODE:
> use test
switched to db test
> db
Test想查看test下有哪些表或者叫collection,可以输入
CODE:
> show collections
system.indexes
user想知道
mongodb支持哪些命令,可以直接输入help
CODE:
> help
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
set curent database to
db.help()
help on DB methods
db.foo.help()
help on collection
methods
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如果想知道当前数据库支持哪些方法:
CODE:
> db.help();
DB methods:
db.addUser(username, password)
添加数据库授权用户
db.auth(username, password)
访问认证
db.cloneDatabase(fromhost) 克隆数据库
db.commandHelp(name) returns the
help for the command
db.copyDatabase(fromdb, todb,
fromhost) 复制数据库
db.createCollection(name, { size :
..., capped : ..., max : ... } ) 创建表
db.currentOp() displays the current
operation in the db
db.dropDatabase()
删除当前数据库
db.eval_r(func, args) run code
server-side
db.getCollection(cname) same as
db['cname'] or db.cname
db.getCollectionNames()
获取当前数据库的表名
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()
db.getReplicationInfo()
db.getSisterDB(name) get the db at
the same server as this onew
db.killOp() kills the current
operation in the db
db.printCollectionStats()
打印各表的状态信息
db.printReplicationInfo()
打印主数据库的复制状态信息
db.printSlaveReplicationInfo()
打印从数据库的复制状态信息
db.printShardingStatus()
打印分片状态信息
db.removeUser(username) 删除数据库用户
db.repairDatabase() 修复数据库
db.resetError()
db.runCommand(cmdObj) run a database
command. if cmdObj is a string, turns it into { cmdObj :
1 }
db.setProfilingLevel(level) 0=off
1=slow 2=all
db.shutdownServer()
db.version() current version of the
server如果想知道当前数据库下的表或者表collection支持哪些方法,可以使用一下命令如:
CODE:
> db.user.help(); user为表名
DBCollection help
db.foo.count()
统计表的行数
db.foo.dataSize()
统计表数据的大小
db.foo.distinct( key ) - eg.
db.foo.distinct( 'x' )
按照给定的条件除重
db.foo.drop() drop the collection
删除表
db.foo.dropIndex(name) 删除指定索引
db.foo.dropIndexes() 删除所有索引
db.foo.ensureIndex(keypattern,options) - options
should be an object with these possible fields: name, unique,
dropDups 增加索引
db.foo.find( [query] , [fields]) -
first parameter is an optional query filter. second parameter is
optional set of fields to return. 根据条件查找数据
e.g. db.foo.find( { x
: 77 } , { name : 1 , x : 1 } )
db.foo.find(...).count()
db.foo.find(...).limit(n)
根据条件查找数据并返回指定记录数
db.foo.find(...).skip(n)
db.foo.find(...).sort(...) 查找排序
db.foo.findOne([query])
根据条件查询只查询一条数据
db.foo.getDB() get DB object
associated with collection 返回表所属的库
db.foo.getIndexes() 显示表的所有索引
db.foo.group( { key : ..., initial:
..., reduce : ...[, cond: ...] } ) 根据条件分组
db.foo.mapReduce( mapFunction ,
reduceFunction , )
db.foo.remove(query) 根据条件删除数据
db.foo.renameCollection( newName )
renames the collection 重命名表
db.foo.save(obj) 保存数据
db.foo.stats() 查看表的状态
db.foo.storageSize() - includes free
space allocated to this collection 查询分配到表空间大小
db.foo.totalIndexSize() - size in
bytes of all the indexes 查询所有索引的大小
db.foo.totalSize() - storage
allocated for all data and indexes 查询表的总大小
db.foo.update(query, object[,
upsert_bool]) 根据条件更新数据
db.foo.validate() - SLOW
验证表的详细信息
db.foo.getShardVersion() - only for
use with shardingMongodb的备份工具mongodump 如果想备份数据库test 如:
CODE:
[falcon@www.fwphp.cn ~/mongodb/bin]$ ./mongodump
--help
options:
--help
produce help message
-h [ --host ] arg mongo
host to connect to
-d [ --db ] arg
database to use
-c [ --collection ] arg collection to use (some
commands)
-u [ --username ] arg username
-p [ --password ] arg password
--dbpath arg
directly access mongod data files in this path,
instead of connecting
to a mongod instance
-v [ --verbose ] be
more verbose (include multiple times for more
verbosity e.g.
-vvvvv)
-o [ --out ] arg (=dump) output directory
[falcon@www.fwphp.cn ~/mongodb/bin]$
[color=Blue]./mongodump -d test -o test/[/color]
connected to: 127.0.0.1
DATABASE: test to
test/test
test.user to test/test/user.bson
100000 objects
test.system.indexes to
test/test/system.indexes.bson
1 objects
[falcon@www.fwphp.cn ~/mongodb/bin]$ ls
2 mongo mongodump
mongofiles mongorestore mongosniff
dump mongod mongoexport mongoimport mongos
testMongoDB的数据恢复工具mongorestore 查看test库中的表
CODE:
> show collections
system.indexes
User删除user表
CODE:
> db.user.drop();
True > show collections
System.indexes现在利用mongorestore表恢复刚才利用mongodump备份的数据
CODE:
[falcon@www.fwphp.cn ~/mongodb/bin]$ ./mongorestore
--help
usage: ./mongorestore [options] [directory or filename to restore
from]
options:
--help
produce help message
-h [ --host ] arg mongo host to
connect to
-d [ --db ] arg
database to use
-c [ --collection ] arg collection to use (some commands)
-u [ --username ] arg username
-p [ --password ] arg password
--dbpath arg
directly access mongod data files in this path,
instead of connecting
to a mongod instance
-v [ --verbose ] be more
verbose (include multiple times for more
verbosity e.g. -vvvvv)
[falcon@www.fwphp.cn ~/mongodb/bin]$ ./mongorestore -d
test -c user test/test/user.bson
connected to: 127.0.0.1
test/test/user.bson
going into namespace [test.user]
100000 objectsUser表中的10w条记录已经恢复
CODE:
> show collections
system.indexes
user
> db.user.find();
{ "_id" : ObjectId("4b9c8db08ead0e3347000000"), "uid" : 1,
"username" : "Falcon.C-1" }
{ "_id" : ObjectId("4b9c8db08ead0e3347010000"), "uid" : 2,
"username" : "Falcon.C-2" }
{ "_id" : ObjectId("4b9c8db08ead0e3347020000"), "uid" : 3,
"username" : "Falcon.C-3" }
{ "_id" : ObjectId("4b9c8db08ead0e3347030000"), "uid" : 4,
"username" : "Falcon.C-4" }
{ "_id" : ObjectId("4b9c8db08ead0e3347040000"), "uid" : 5,
"username" : "Falcon.C-5" } has
moremongodb还提供了HTTP查看运行状态及restfull的接口
默认的访问端口是28017
mdb_001.jpg
mongodb www.fwphp.cn-27017_1268719188106.png
rest的访问接口
mdb_002.jpg