root@adela-vm:/opt/mongodb_simple# numactl --interleave=all bin/mongod -f conf/mongod.conf
about to fork child process, waiting until server is ready for connections.
forked process: 4904
child process started successfully, parent exiting

root@adela-vm:/opt/mongodb_simple# ./bin/mongo 127.0.0.1:12345
MongoDB shell version: 2.6.9
connecting to: 127.0.0.1:12345/test

> show dbs   //显示有几个数据库
admin (empty)
local 0.078GB

> use adela  //切换到adela数据库，不需要事先定义
switched to db adela

> show dbs     //adela数据库没有增加内容，所以不现实
admin (empty)
local 0.078GB
>

RDBMS中的表 对应 mongoDB中的集合collections ，插入内容为json格式
db.集合名（表）.insert(json格式)
db.adela_collection.insert({"x":1})

显示所有的集合
> show collections
adela_collection
system.indexes

插入数据
> db.adela_collection.insert({y:2})
WriteResult({ "nInserted" : 1 })
> db.adela_collection.find()
{ "_id" : ObjectId("5514f09641daf13c28f7bdb7"), "x" : 1 }
{ "_id" : ObjectId("5514f12b41daf13c28f7bdb8"), "y" : 2 }

_id是系统自动分配的，也可以自定义，但是 _id 不能重复
> db.adela_collection.insert({a:1,_id:1})
WriteResult({ "nInserted" : 1 })
> db.adela_collection.insert({a:2,_id:1})
WriteResult({
       "nInserted" : 0,
       "writeError" : {
               "code" : 11000,
               "errmsg" : "insertDocument :: caused by :: 11000 E11000 duplicate key error index: adela.adela_collection.$_id_ dup key: { : 1.0 }"
       }
})

查询adela_collection全表
> db.adela_collection.find() //不加参数

查询x为1的数据
> db.adela_collection.find({x:1})
{ "_id" : ObjectId("5514f09641daf13c28f7bdb7"), "x" : 1 }
{ "_id" : ObjectId("5514f1d241daf13c28f7bdb9"), "x" : 1 }

循环插入一批数据
> for(i=1;i<11;i++)db.adela_collection.insert({z:i})
WriteResult({ "nInserted" : 1 })

> db.adela_collection.find()
{ "_id" : ObjectId("5514f09641daf13c28f7bdb7"), "x" : 1 }
{ "_id" : ObjectId("5514f12b41daf13c28f7bdb8"), "y" : 2 }
{ "_id" : ObjectId("5514f1d241daf13c28f7bdb9"), "x" : 1 }
{ "_id" : 1, "a" : 1 }
{ "_id" : ObjectId("5514f5eca1b17c0bb936fe54"), "z" : 1 }
{ "_id" : ObjectId("5514f5eca1b17c0bb936fe55"), "z" : 2 }
{ "_id" : ObjectId("5514f5eca1b17c0bb936fe56"), "z" : 3 }
{ "_id" : ObjectId("5514f5eca1b17c0bb936fe57"), "z" : 4 }
{ "_id" : ObjectId("5514f5eca1b17c0bb936fe58"), "z" : 5 }
{ "_id" : ObjectId("5514f5eca1b17c0bb936fe59"), "z" : 6 }
{ "_id" : ObjectId("5514f5eca1b17c0bb936fe5a"), "z" : 7 }
{ "_id" : ObjectId("5514f5eca1b17c0bb936fe5b"), "z" : 8 }
{ "_id" : ObjectId("5514f5eca1b17c0bb936fe5c"), "z" : 9 }
{ "_id" : ObjectId("5514f5eca1b17c0bb936fe5d"), "z" : 10 }

计数count
> db.adela_collection.find().count()
14

skip跳过多少条数据
limit限制返回多少条数据
sort使用排序
> db.adela_collection.find()
{ "_id" : ObjectId("5514f09641daf13c28f7bdb7"), "x" : 1 }
{ "_id" : ObjectId("5514f12b41daf13c28f7bdb8"), "y" : 2 }
{ "_id" : ObjectId("5514f1d241daf13c28f7bdb9"), "x" : 1 }
{ "_id" : 1, "a" : 1 }
{ "_id" : ObjectId("5514f5eca1b17c0bb936fe54"), "z" : 1 }
{ "_id" : ObjectId("5514f5eca1b17c0bb936fe55"), "z" : 2 }
{ "_id" : ObjectId("5514f5eca1b17c0bb936fe56"), "z" : 3 }
{ "_id" : ObjectId("5514f5eca1b17c0bb936fe57"), "z" : 4 }
{ "_id" : ObjectId("5514f5eca1b17c0bb936fe58"), "z" : 5 }
{ "_id" : ObjectId("5514f5eca1b17c0bb936fe59"), "z" : 6 }
{ "_id" : ObjectId("5514f5eca1b17c0bb936fe5a"), "z" : 7 }
{ "_id" : ObjectId("5514f5eca1b17c0bb936fe5b"), "z" : 8 }
{ "_id" : ObjectId("5514f5eca1b17c0bb936fe5c"), "z" : 9 }
{ "_id" : ObjectId("5514f5eca1b17c0bb936fe5d"), "z" : 10 }

> db.adela_collection.find().skip(4)
{ "_id" : ObjectId("5514f5eca1b17c0bb936fe54"), "z" : 1 }
{ "_id" : ObjectId("5514f5eca1b17c0bb936fe55"), "z" : 2 }
{ "_id" : ObjectId("5514f5eca1b17c0bb936fe56"), "z" : 3 }
{ "_id" : ObjectId("5514f5eca1b17c0bb936fe57"), "z" : 4 }
{ "_id" : ObjectId("5514f5eca1b17c0bb936fe58"), "z" : 5 }
{ "_id" : ObjectId("5514f5eca1b17c0bb936fe59"), "z" : 6 }
{ "_id" : ObjectId("5514f5eca1b17c0bb936fe5a"), "z" : 7 }
{ "_id" : ObjectId("5514f5eca1b17c0bb936fe5b"), "z" : 8 }
{ "_id" : ObjectId("5514f5eca1b17c0bb936fe5c"), "z" : 9 }
{ "_id" : ObjectId("5514f5eca1b17c0bb936fe5d"), "z" : 10 }

> db.adela_collection.find().skip(4).limit(5)
{ "_id" : ObjectId("5514f5eca1b17c0bb936fe54"), "z" : 1 }
{ "_id" : ObjectId("5514f5eca1b17c0bb936fe55"), "z" : 2 }
{ "_id" : ObjectId("5514f5eca1b17c0bb936fe56"), "z" : 3 }
{ "_id" : ObjectId("5514f5eca1b17c0bb936fe57"), "z" : 4 }
{ "_id" : ObjectId("5514f5eca1b17c0bb936fe58"), "z" : 5 }

> db.adela_collection.find().skip(4).limit(5).sort({z:1})
{ "_id" : ObjectId("5514f5eca1b17c0bb936fe54"), "z" : 1 }
{ "_id" : ObjectId("5514f5eca1b17c0bb936fe55"), "z" : 2 }
{ "_id" : ObjectId("5514f5eca1b17c0bb936fe56"), "z" : 3 }
{ "_id" : ObjectId("5514f5eca1b17c0bb936fe57"), "z" : 4 }
{ "_id" : ObjectId("5514f5eca1b17c0bb936fe58"), "z" : 5 }

十载的琼结网站建设经验，针对设计、前端、开发、售后、文案、推广等六对一服务，响应快，48小时及时工作处理。营销型网站建设的优势是能够根据用户设备显示端的尺寸不同，自动调整琼结建站的显示方式，使网站能够适用不同显示终端，在浏览器中调整网站的宽度，无论在任何一种浏览器上浏览网站，都能展现优雅布局与设计，从而大程度地提升浏览体验。创新互联建站从事“琼结网站设计”,“琼结网站推广”以来，每个客户项目都认真落实执行。

另外有需要云服务器可以了解下创新互联scvps.cn，海内外云服务器15元起步，三天无理由+7*72小时售后在线，公司持有idc许可证，提供“云服务器、裸金属服务器、高防服务器、香港服务器、美国服务器、虚拟主机、免备案服务器”等云主机租用服务以及企业上云的综合解决方案，具有“安全稳定、简单易用、服务可用性高、性价比高”等特点与优势，专为企业上云打造定制，能够满足用户丰富、多元化的应用场景需求。

当前标题：mongoBD学习（三）插入与查询数据-创新互联
文章路径：http://lswzjz.com/article/dsigdp.html