mongodb 1: 把玩把玩
这里对mongodb做一些初步认识当然首先得启动服务和mongo shell
/usr/local/mongodb/bin/mongod --dbpath /home/yangdong/data/db/usr/local/mongodb/bin/mongo 1、实例一个数据库
>use sample #sample不存在会创建一个
>db #这里指向sample
> use sampleswitched to db sample> dbsample
2、集合（表）
#创建
user = {"name":"nico", "age":30, "gender":"male"}
db.users.insert(user)
#如果没有集合users会创建，并插入文档user数据
> user = {"name":"nico", "age":30, "gender":"male"}{ "name" : "nico", "age" : 30, "gender" : "male" }> db.users.insert(user)
#查看
db.users.find() #读取所有文档
db.users.findOne() #读取一个文档
> db.users.find(){ "_id" : ObjectId("4f54747222eb23a50e4f5db5"), "name" : "nico", "age" : 30, "gender" : "male" }> db.users.findOne(){ "_id" : ObjectId("4f54747222eb23a50e4f5db5"), "name" : "nico", "age" : 30, "gender" : "male"}
#更新
user.address = "chengdu"
db.users.update({"name":"nico"}, user)
db.users.find()
> user.address = "chengdu"chengdu> db.users.update({"name":"nico"}, user)> db.users.find(){ "_id" : ObjectId("4f54747222eb23a50e4f5db5"), "name" : "nico", "age" : 30, "gender" : "male", "address" : "chengdu" }>
#删除
#删除文档
db.users.remove({"name":"aaa"})
db.users.remove()
> db.users.remove({"name":"aaa"})> db.users.find(){ "_id" : ObjectId("4f54747222eb23a50e4f5db5"), "name" : "nico", "age" : 30, "gender" : "male", "address" : "chengdu" }> db.users.remove()> db.users.find()>
以上操作在pymongo中实现
#!/usr/bin/env python# -*- coding: utf-8 -*-from pymongo import Connection#get a connectionconnection = Connection('localhost', 27017)#show all databasesprint connection.database_names()#instance a new dbdb = connection['sample']#get a collection --> tableusers = db.usersuser = {"name":"nico", "age":30, "gender":"male"}users.insert(user)#读取所有文档datas = users.find()for user in datas: print user#读取一个文档print users.find_one()#updateusers.update({"name":"nico"}, {"$set":{"address":"chengdu"}})print users.find_one()#remove documentusers.remove()
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