MongoDb 命令查询所有数据库列表

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[sql] view plain copy           MongoDb 命令查询所有数据库列表            CODE:            > show dbs            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      Dos代码  收藏代码                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 curent database to <db name>                  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();      Java代码  收藏代码                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      Java代码  收藏代码                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      -----------------------      通过条件查询: 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 , <optional params> )            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 sharding      Mongodb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]$ ./mongodump -d test -o test/      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     test      MongoDB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 objects      User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 more                                       1. 超级用户相关:                     #增加或修改用户密码                     db.addUser('admin','pwd')                     #查看用户列表                     db.system.users.find()                     #用户认证                     db.auth('admin','pwd')                     #删除用户                     db.removeUser('mongodb')                     #查看所有用户                     show users                     #查看所有数据库                     show dbs                     #查看所有的collection                     show collections                     #查看各collection的状态                     db.printCollectionStats()                     #查看主从复制状态                     db.printReplicationInfo()                     #修复数据库                     db.repairDatabase()                     #设置记录profiling,0=off 1=slow 2=all                     db.setProfilingLevel(1)                     #查看profiling                     show profile                     #拷贝数据库                     db.copyDatabase('mail_addr','mail_addr_tmp')                     #删除collection                     db.mail_addr.drop()                     #删除当前的数据库                     db.dropDatabase()               2. 客户端连接                      /usr/local/mongodb/bin/mongo user_addr -u user -p 'pwd'               3. 增删改                       #存储嵌套的对象                      db.foo.save({'name':'ysz','address':{'city':'beijing','post':100096},'phone':[138,139]})                      #存储数组对象                      db.user_addr.save({'Uid':'yushunzhi@sohu.com','Al':['test-1@sohu.com','test-2@sohu.com']})                      #根据query条件修改,如果不存在则插入,允许修改多条记录                      db.foo.update({'yy':5},{'$set':{'xx':2}},upsert=true,multi=true)                      #删除yy=5的记录                      db.foo.remove({'yy':5})                      #删除所有的记录                     db.foo.remove()               4. 索引                      增加索引:1(ascending),-1(descending)                      db.things.ensureIndex({firstname: 1, lastname: 1}, {unique: true});                      #索引子对象                      db.user_addr.ensureIndex({'Al.Em': 1})                      #查看索引信息                      db.deliver_status.getIndexes()                      db.deliver_status.getIndexKeys()                      #根据索引名删除索引                      db.user_addr.dropIndex('Al.Em_1')               5. 查询                      查找所有                      db.foo.find()                      #查找一条记录                      db.foo.findOne()                      #根据条件检索10条记录                      db.foo.find({'msg':'Hello 1'}).limit(10)                      #sort排序                      db.deliver_status.find({'From':'yushunzhi@sohu.com'}).sort({'Dt',-1})                      db.deliver_status.find().sort({'Ct':-1}).limit(1)                     #count操作                     db.user_addr.count()                     #distinct操作                     db.foo.distinct('msg')                     #>操作                     db.foo.find({"timestamp": {"$gte" : 2}})                     #子对象的查找                     db.foo.find({'address.city':'beijing'})               6. 管理                      查看collection数据的大小                      db.deliver_status.dataSize()                      #查看colleciont状态                      db.deliver_status.stats()                      #查询所有索引的大小                      db.deliver_status.totalIndexSize()   


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