MongoDb 命令查詢所有數據庫列表 CODE: > show dbs 如果想查看當前連接在哪個數據庫下面,可以直接輸入db CODE: > db Admin 想切換到test數據庫下面 CODE: > use test switched to db test > db Test 想查看test下有哪些表或者叫collection,可以輸入 CODE: > show collections system.indexes user 想知道mongodb支持哪些命令,可以直接輸入help CODE: > help Dos代碼 收藏代碼 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 如果想知道當前數據庫支持哪些方法: CODE: > db.help(); Java代碼 收藏代碼 DB methods: db.addUser(username, password) 添加數據庫授權用戶 db.auth(username, password) 訪問認證 db.cloneDatabase(fromhost) 克隆數據庫 db.commandHelp(name) returns the help for the command db.copyDatabase(fromdb, todb, fromhost) 復制數據庫 db.createCollection(name, { size : ..., capped : ..., max : ... } ) 創建表 db.currentOp() displays the current operation in the db db.dropDatabase() 刪除當前數據庫 db.eval_r(func, args) run code server-side db.getCollection(cname) same as db['cname'] or db.cname db.getCollectionNames() 獲取當前數據庫的表名 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() 打印各表的狀態信息 db.printReplicationInfo() 打印主數據庫的復制狀態信息 db.printSlaveReplicationInfo() 打印從數據庫的復制狀態信息 db.printShardingStatus() 打印分片狀態信息 db.removeUser(username) 刪除數據庫用戶 db.repairDatabase() 修復數據庫 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 如果想知道當前數據庫下的表或者表collection支持哪些方法,可以使用一下命令如: CODE: > db.user.help(); user為表名 Java代碼 收藏代碼 DBCollection help db.foo.count() 統計表的行數 db.foo.dataSize() 統計表數據的大小 db.foo.distinct( key ) - eg. db.foo.distinct( 'x' ) 按照給定的條件除重 db.foo.drop() drop the collection 刪除表 db.foo.dropIndex(name) 刪除指定索引 db.foo.dropIndexes() 刪除所有索引 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. 根據條件查找數據 ----------------------- 通過條件查詢: db.foo.find( { x : 77 } , { name : 1 , x : 1 } ) ----------------------------- 如果想知道當前數據庫下的表或者表collection支持哪些方法,可以使用一下命令如: CODE: > db.user.help(); user為表名 Java代碼 收藏代碼 DBCollection help db.foo.count() 統計表的行數 db.foo.dataSize() 統計表數據的大小 db.foo.distinct( key ) - eg. db.foo.distinct( 'x' ) 按照給定的條件除重 db.foo.drop() drop the collection 刪除表 db.foo.dropIndex(name) 刪除指定索引 db.foo.dropIndexes() 刪除所有索引 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. 根據條件查找數據 ----------------------- 通過條件查詢: db.foo.find( { x : 77 } , { name : 1 , x : 1 } ) ----------------------------- 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的數據恢復工具mongorestore 查看test庫中的表 CODE: > show collections system.indexes User 刪除user表 CODE: > db.user.drop(); True > show collections System.indexes 現在利用mongorestore表恢復剛才利用mongodump備份的數據 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條記錄已經恢復 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. 超級用戶相關: #增加或修改用戶密碼 db.addUser('admin','pwd') #查看用戶列表 db.system.users.find() #用戶認證 db.auth('admin','pwd') #刪除用戶 db.removeUser('mongodb') #查看所有用戶 show users #查看所有數據庫 show dbs #查看所有的collection show collections #查看各collection的狀態 db.printCollectionStats() #查看主從復制狀態 db.printReplicationInfo() #修復數據庫 db.repairDatabase() #設置記錄profiling,0=off 1=slow 2=all db.setProfilingLevel(1) #查看profiling show profile #拷貝數據庫 db.copyDatabase('mail_addr','mail_addr_tmp') #刪除collection db.mail_addr.drop() #刪除當前的數據庫 db.dropDatabase() 2. 客戶端連接 /usr/local/mongodb/bin/mongo user_addr -u user -p 'pwd' 3. 增刪改 #存儲嵌套的對象 db.foo.save({'name':'ysz','address':{'city':'beijing','post':100096},'phone':[138,139]}) #存儲數組對象 db.user_addr.save({'Uid':'yushunzhi@sohu.com','Al':['test-1@sohu.com','test-2@sohu.com']}) #根據query條件修改,如果不存在則插入,允許修改多條記錄 db.foo.update({'yy':5},{'$set':{'xx':2}},upsert=true,multi=true) #刪除yy=5的記錄 db.foo.remove({'yy':5}) #刪除所有的記錄 db.foo.remove() 4. 索引 增加索引:1(ascending),-1(descending) db.things.ensureIndex({firstname: 1, lastname: 1}, {unique: true}); #索引子對象 db.user_addr.ensureIndex({'Al.Em': 1}) #查看索引信息 db.deliver_status.getIndexes() db.deliver_status.getIndexKeys() #根據索引名刪除索引 db.user_addr.dropIndex('Al.Em_1') 5. 查詢 查找所有 db.foo.find() #查找一條記錄 db.foo.findOne() #根據條件檢索10條記錄 db.foo.find({'msg':'Hello 1'}).limit(10) #sort排序 db.deliver_status.find({'From':'yushunzhi@sohu.com'}).sort({'Dt',-1}) db.deliver_status.find().sort({'Ct':-1}).limit(1) #count操作 db.user_addr.count() #distinct操作 db.foo.distinct('msg') #>操作 db.foo.find({"timestamp": {"$gte" : 2}}) #子對象的查找 db.foo.find({'address.city':'beijing'}) 6. 管理 查看collection數據的大小 db.deliver_status.dataSize() #查看colleciont狀態 db.deliver_status.stats() #查詢所有索引的大小 db.deliver_status.totalIndexSize()