库：database
表：collection
行：document
字段：对应键的值
mongo的每一个document的key可以不一样
基于BSON的find函数
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MongoDB的数据类型
null boolean(true | false)? int float string
object ID(new ObjectId())? date(new Date())
timestamp? array? inner_document({key: value, key: {key: value, ...}})
RegExp
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1../mongo ip/db (默认localhost/test)
2.创建db??? use db_name? 如果没有创建任何集合，系统会删除这个db
3.添加用户和认证?? db.addUser("name", "passwd", [true | false(是否只读)])? db.auth("name", "passwd")
admin数据库下添加用户和认证可以管理所有的数据库
4.db.document.insert({key: value, ...})?? 自动创建_id
5.show dbs? 查看数据库
6.show collections
7.db.users.insert({name: "sosop", age: 26})
8.db.users.find()
9. db.users.update({name: "sosop"}, {$set:{age: 25}})
10.db.users.update({name: "sosop"}, {$inc:{age: 1}})
11.db.users.update({name: "kent"}, {$unset:{age:1}})
12.db.users.update({name: "kent"}, {$push:{arr:28}})
13.db.users.update({name: "kent"}, {$pop:{arr:2}})
14.db.users.update({name: "kent"}, {$pull:{arr: 1}})
15.db.users.update({name: "kent"}, {$rename:{'arr':'a'}})
16.db.users.findOne()
17.db.users.findOne({name: "..."}) 带参数查询
18.db.users.find({}, {age: 0})? 返回除了age外的所有字段
19.db.user.find({condition}, {name: 1}) 返回条件符合的name字段
20.db.user.find({age: {$gt | $lt | $gte | $lte | ne [, $gt] :20}})
21.db.user.find:? $all: [.....]?? $in: [.....]?? $nin: [.....]
$exists: true | false???? $or [{},{},....]?? $nor [{},{},....]
{arr: {$size: n}}? {arr: {$type: n}}? {name: /regexp/}
22.db.users.find().sort({age: 1})
23.db.user.distinct("")
24.db.users.find().skip(n)
25.db.users.find().limit(1)
26.db.users.find().skip(n).limit(m)
27.db.users.find({age: 26}, {name: 1}, 1, 2)???? params: condition, fields, limit, skip
28.db.users.find().count()
29.db.users.remove({condition})
30.db.users.ensureIndex({field: 1})
31.db.users.getIndexs
32.db.users.dropIndexs
33.db.users.dropIndex({condition})
34.db.users.reIndex({})
35.db.system.users.find()
36.db.removeUser(username)
37.db.system.users.remove({username: ''...})
38.db.users.stats
39.db.users.drop()
40.db.cloneDatabase(fromHost)
41.db.copyDatabase(fromDB, toDB, fromHost)
42.db.dropDatabase()
43.db.repairDatabase()
44.db.shutdownServer()
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最重要的? db.help()?? db.collection.help()
