show dbs show database names

			
> show dbs
local	(empty)
logging	0.203125GB
test	0.203125GB
			
			

show collections show collections in current database

			

> show collections
bios
system.indexes
			
			

另一种用法是show tables

			
> show tables
bios
system.indexes
			
			

show users show users in current database

show profile show most recent system.profile entries with time >= 1ms

			
> show profile
db.system.profile is empty
Use db.setProfilingLevel(2) will enable profiling
Use db.system.profile.find() to show raw profile entries
			
			

存储嵌套的对象

			
db.foo.save({'name':'neo','address':{'city':'shenzhen','post':518000},'phone':[13113668890,13322993040]})
			
			

存储数组对象

			
db.foo.save({'Uid':'netkiller@msn.com','phone':['13322993040','13113668890']})
			
			

			
db.bios.insert(
   {
     _id: 1,
     name: { first: 'John', last: 'Backus' },
     birth: new Date('Dec 03, 1924'),
     death: new Date('Mar 17, 2007'),
     contribs: [ 'Fortran', 'ALGOL', 'Backus-Naur Form', 'FP' ],
     awards: [
               {
                 award: 'W.W. McDowell Award',
                 year: 1967,
                 by: 'IEEE Computer Society'
               },
               {
                 award: 'National Medal of Science',
                 year: 1975,
                 by: 'National Science Foundation'
               },
               {
                 award: 'Turing Award',
                 year: 1977,
                 by: 'ACM'
               },
               {
                 award: 'Draper Prize',
                 year: 1993,
                 by: 'National Academy of Engineering'
               }
             ]
   }
)
			
			

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uid=10的记录

			
db.foo.remove({'uid':10})
			
			

删除所有的记录

db.foo.remove()
			

db.foo.remove({ "_id" : ObjectId("56e10b66a22ef1b1408b4567")})
				

查找所有 所有记录

db.foo.find()                list objects in collection foo
db.foo.find( { a : 1 } )     list objects in foo where a == 1
			

查找一条记录

db.foo.findOne()
			

根据条件检索10条记录

db.foo.find({'name':'neo'}).limit(10)
			

sort排序

db.foo.find({'name':'neo'}).sort({'Dt',-1})
db.foo.find().sort({'Ct':-1}).limit(1)
			

count记录统计操作

db.foo.count()
			

distinct操作,去重复查询指定列，

db.foo.distinct('name')
			

”>=”操作

			
db.foo.find({"timestamp": {"$gte" : 2}})
			
			

子对象的查找

db.foo.find({'address.city':'shenzhen'})
			

			
> db.access.count()
51528
> db.access.count()
104401
			
			

group()类似SQL中的Group by

			
> db.test.group({key: {remote_addr: true}, initial: {count: 0}, reduce: function(obj, prev) {prev.count++}});
[
	{
		"remote_addr" : "192.168.2.76",
		"count" : 3
	},
	{
		"remote_addr" : "192.168.2.70",
		"count" : 1
	}
]