1.mongodb入门命令

1.1 show databases; 或 show dbs; //查看当前的数据库

>show dbs;

admin0.000GB

config0.000GB

local0.000GB

1.2 use databaseName  选择库

show tables/collections 查看当前库下的collections

1.3 如何创建库

mongodb 的库是隐式创建，你可以use一个不存在的库

然后在该库下创建collection，即可创建库

1.4 db.createCollection('collectionName');  //创建collection

1.5 collection 允许隐式创建

db.collectionName.insert(document);

1.6 db.collectionName.drop();       /删除collection

> useshop

switchedtodb shop> db.createCollection('user');

{ "ok" :1}>show dbs;

admin0.000GB

config0.000GB

local0.000GB

shop0.000GB>show collections;user

1.7插入user表语句

(1)自动生成id值

db.user.insert({name:'lisi',age:22})

WriteResult({ "nInserted" :1})> db.user.find();

{ "_id" : ObjectId("5d73077c71b815674de4d152"), "name" : "lisi", "age" :22 }

(2) 指定生成id

> db.user.insert({_id:2,name:'wangwu',age:25})

WriteResult({ "nInserted" :1})> db.user.find();

{ "_id" : ObjectId("5d73077c71b815674de4d152"), "name" : "lisi", "age" :22}

{ "_id" :2, "name" : "wangwu", "age" : 25 }

(3) 插入多层

> db.user.insert({_id:3,name:'xiaobing',hobby:['basketball','football'],intro:{'title':'My intro','content':'from china'}});

WriteResult({ "nInserted" :1})> db.user.find();

{ "_id" : ObjectId("5d73077c71b815674de4d152"), "name" : "lisi", "age" :22}

{ "_id" :2, "name" : "wangwu", "age" : 25}

{ "_id" :3, "name" : "xiaobing", "hobby" : ["basketball", "football"], "intro" : { "title" : "My intro", "content" : "fromchina" } }>

1.8 其实mongodb不需要声明表,可直接写入表数据,即可创建成功!

>show tables;user

> db.goods.insert({_id:1,name:'oppoR11',price:'3000'});

WriteResult({ "nInserted" :1})>show tables;

goodsuser

>db.goods.find()

{ "_id" :1, "name" : "oppoR11", "price" : "3000" }

1.9 删除表 db.collectionName.drop();

>show collections

goodsuser

> db.goods.drop();

true>show collections;user

>

2.0 删除数据库

db.dropDatabase()

>show dbs;

admin0.000GB

config 0.000GB

local 0.000GB

shop 0.000GB> useshop;

switchedtodb shop>db.dropDatabase();

{ "dropped" : "shop", "ok" :1}>show dbs;

admin0.000GB

config 0.000GB

local 0.000GB>

2.1 查询帮助 db.help();

>db.help()

DB methods:

db.adminCommand(nameOrDocument)- switches to 'admin' db, and runs command [just calls db.runCommand(...)]db.aggregate([pipeline], {options}) - performs a collectionless aggregation on this database; returns a cursordb.auth(username, password)

db.cloneDatabase(fromhost)-deprecated

db.commandHelp(name)returns the help forthe command

db.copyDatabase(fromdb, todb, fromhost)-deprecated

db.createCollection(name, {size: ..., capped: ...,max: ...})

db.createView(name, viewOn,[{$operator: {...}}, ...], {viewOptions})

db.createUser(userDocument)

db.currentOp() displays currently executing operationsinthe db

db.dropDatabase()

db.eval()-deprecated

db.fsyncLock() flush datato disk and lock server forbackups

db.fsyncUnlock() unlocks server following a db.fsyncLock()

db.getCollection(cname) sameas db['cname'] ordb.cname

db.getCollectionInfos([filter]) - returns a list that contains the names and options of the db's collections

db.getCollectionNames()

db.getLastError() - just returns the err msg string

db.getLastErrorObj() - return full status object

db.getLogComponents()

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.getWriteConcern() - returns the write concern used for any operations on this db, inherited from server object if set

db.hostInfo() get details about the server's host

db.isMaster()check replica primarystatus

db.killOp(opid) kills thecurrent operation inthe db

db.listCommands() listsallthe db commands

db.loadServerScripts() loadsall the scripts indb.system.js

db.logout()

db.printCollectionStats()

db.printReplicationInfo()

db.printShardingStatus()

db.printSlaveReplicationInfo()

db.dropUser(username)

db.repairDatabase()

db.resetError()

db.runCommand(cmdObj) run adatabase command. if cmdObj is a string, turns it into {cmdObj: 1}

db.serverStatus()

db.setLogLevel(level,)

db.setProfilingLevel(level,slowms) 0=off 1=slow 2=alldb.setWriteConcern() - sets the write concern for writes tothe db

db.unsetWriteConcern() - unsets the write concern for writes tothe db

db.setVerboseShell(flag) display extra informationinshell output

db.shutdownServer()

db.stats()

db.version()current version of the server

未完,后续补充....