mongodb的安装配置与简单使用过程
# ./mongoMongoDB shell version: 3.0.3
connecting to: test
Welcome to the MongoDB shell.
> db#查看所有数据库
local
> show collections
startup_log
system.indexes
> use mydb#直接use mydb 就可以创建mydb这个数据库
switched to db mydb
> db
mydb
> db.user.save({name:'Rod',age:30}) #新增数据
> for(var i=1;i db.user.find()
{ "_id" : ObjectId("557e8101e23d20a4115e493d"), "x" : 8, "y" : 1 }
{ "_id" : ObjectId("557e8101e23d20a4115e493e"), "x" : 8, "y" : 2 }
{ "_id" : ObjectId("557e8101e23d20a4115e493f"), "x" : 8, "y" : 3 }
{ "_id" : ObjectId("557e8101e23d20a4115e4940"), "x" : 8, "y" : 4 }
{ "_id" : ObjectId("557e8101e23d20a4115e4941"), "x" : 8, "y" : 5 }
{ "_id" : ObjectId("557e8101e23d20a4115e4942"), "x" : 8, "y" : 6 }
{ "_id" : ObjectId("557e8101e23d20a4115e4943"), "x" : 8, "y" : 7 }
{ "_id" : ObjectId("557e8101e23d20a4115e4944"), "x" : 8, "y" : 8 }
{ "_id" : ObjectId("557e8101e23d20a4115e4945"), "x" : 8, "y" : 9 }
{ "_id" : ObjectId("557e8101e23d20a4115e4946"), "x" : 8, "y" : 10 }
> db.user.find({y:{$lt:5}}) #查询y小于5的数据
{ "_id" : ObjectId("557e8101e23d20a4115e493d"), "x" : 8, "y" : 1 }
{ "_id" : ObjectId("557e8101e23d20a4115e493e"), "x" : 8, "y" : 2 }
{ "_id" : ObjectId("557e8101e23d20a4115e493f"), "x" : 8, "y" : 3 }
{ "_id" : ObjectId("557e8101e23d20a4115e4940"), "x" : 8, "y" : 4 }
> db.user.findOne() #只查询第一条数据
{ "_id" : ObjectId("557e8101e23d20a4115e493d"), "x" : 8, "y" : 1 }
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