数据库操作语法 mongo --path db.AddUser(username,password) 添加用户 db.auth(usrename,password) 设置数据库连接验证 db.cloneDataBase(fromhost) 从目标服务器克隆一个数据库 db.commandHelp(name) returns the help for the command db.copyDatabase(fromdb,todb,fromhost) 复制数据库fromdb---源数据库名称，todb---目标数据库名称，fromhost---源数据库服务器地址 db.createCollection(name,{size:3333,capped:333,max:88888}) 创建一个数据集，相当于一个表 db.currentOp() 取消当前库的当前操作 db.dropDataBase() 删除当前数据库 db.eval(func,args) run code server-side db.getCollection(cname) 取得一个数据集合，同用法：db['cname'] or db.cname db.getCollenctionNames() 取得所有数据集合的名称列表 db.getLastError() 返回最后一个错误的提示消息 db.getLastErrorObj() 返回最后一个错误的对象 db.getMongo() 取得当前服务器的连接对象get the server connection object db.getMondo().setSlaveOk() allow this connection to read from then nonmaster membr of a replica pair db.getName() 返回当操作数据库的名称 db.getPrevError() 返回上一个错误对象 db.getProfilingLevel() ?什么等级 db.getReplicationInfo() ?什么信息 db.getSisterDB(name) get the db at the same server as this onew db.killOp() 停止（杀死）在当前库的当前操作 db.printCollectionStats() 返回当前库的数据集状态 db.printReplicationInfo() db.printSlaveReplicationInfo() db.printShardingStatus() 返回当前数据库是否为共享数据库 db.removeUser(username) 删除用户 db.repairDatabase() 修复当前数据库 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() 关闭当前服务程序 db.version() 返回当前程序的版本信息
db.linlin.find({'name':'foobar'}) select * from linlin where name='foobar' db.linlin.find() select * from linlin db.linlin.find({'ID':10}).count() select count(*) from linlin where ID=10 db.linlin.find().skip(10).limit(20) 从查询结果的第十条开始读20条数据 select * from linlin limit 10,20 ----------mysql db.linlin.find({'ID':{$in:[25,35,45]}}) select * from linlin where ID in (25,35,45) db.linlin.find().sort({'ID':-1}) select * from linlin order by ID desc db.linlin.distinct('name',{'ID':{$lt:20}}) select distinct(name) from linlin where ID20
db.linlin.group({key:{'name':true},cond:{'name':'foo'},reduce:function(obj,prev){prev.msum+=obj.marks;},initial:{msum:0}}) select name,sum(marks) from linlin group by name db.linlin.find('this.ID20',{name:1}) select name from linlin where ID20
db.linlin.insert({'name':'foobar','age':25}) insert into linlin ('name','age') values('foobar',25) db.linlin.insert({'name':'foobar','age':25,'email':'cclove2@163.com'})
db.linlin.remove({}) delete * from linlin db.linlin.remove({'age':20}) delete linlin where age=20 db.linlin.remove({'age':{$lt:20}}) delete linlin where age20 db.linlin.remove({'age':{$lte:20}}) delete linlin where age=20 db.linlin.remove({'age':{$gt:20}}) delete linlin where age>20 db.linlin.remove({'age':{$gte:20}}) delete linlin where age>=20 db.linlin.remove({'age':{$ne:20}}) delete linlin where age!=20
db.linlin.update({'name':'foobar'},{$set:{'age':36}}) update linlin set age=36 where name='foobar' db.linlin.update({'name':'foobar'},{$inc:{'age':3}}) update linlin set age=age+3 where name='foobar'
官方提供的操作语句对照表：
上行：SQL 操作语句 下行：Mongo 操作语句 CREATE TABLE USERS (a Number, b Number) db.createCollection("mycoll")
INSERT INTO USERS VALUES(1,1) db.users.insert({a:1,b:1})
SELECT a,b FROM users db.users.find({}, {a:1,b:1})
SELECT * FROM users db.users.find()
SELECT * FROM users WHERE age=33 db.users.find({age:33})
SELECT a,b FROM users WHERE age=33 db.users.find({age:33}, {a:1,b:1})
SELECT * FROM users WHERE age=33 ORDER BY name db.users.find({age:33}).sort({name:1})
SELECT * FROM users WHERE age>33 db.users.find({'age':{$gt:33}})})
SELECT * FROM users WHERE age33 db.users.find({'age':{$lt:33}})})
SELECT * FROM users WHERE name LIKE "%Joe%" db.users.find({name:/Joe/})
SELECT * FROM users WHERE name LIKE "Joe%" db.users.find({name:/^Joe/})
SELECT * FROM users WHERE age>33 AND age=40 db.users.find({'age':{$gt:33,$lte:40}})})
SELECT * FROM users ORDER BY name DESC db.users.find().sort({name:-1})
SELECT * FROM users WHERE a=1 and b='q' db.users.find({a:1,b:'q'})
SELECT * FROM users LIMIT 10 SKIP 20 db.users.find().limit(10).skip(20)
SELECT * FROM users WHERE a=1 or b=2 db.users.find( { $or : [ { a : 1 } , { b : 2 } ] } )
SELECT * FROM users LIMIT 1 db.users.findOne()
SELECT DISTINCT last_name FROM users db.users.distinct('last_name')
SELECT COUNT(*y) FROM users db.users.count()
SELECT COUNT(*y) FROM users where AGE > 30 db.users.find({age: {'$gt': 30}}).count()
SELECT COUNT(AGE) from users db.users.find({age: {'$exists': true}}).count()
CREATE INDEX myindexname ON users(name) db.users.ensureIndex({name:1})
CREATE INDEX myindexname ON users(name,ts DESC) db.users.ensureIndex({name:1,ts:-1})
EXPLAIN SELECT * FROM users WHERE z=3 db.users.find({z:3}).explain()
UPDATE users SET a=1 WHERE b='q' db.users.update({b:'q'}, {$set:{a:1}}, false, true)
UPDATE users SET a=a+2 WHERE b='q' db.users.update({b:'q'}, {$inc:{a:2}}, false, true)
DELETE FROM users WHERE z="abc" db.users.remove({z:'abc'});
