MongoDB学习一

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MongoDB中的三要素：数据库、数据、集合，其中集合就是对应关系数据库中的表，文档对应行。

（1）

下载:MongoDB官网下载对应版本的MongoDB数据库

（2）

指定数据的存储位置

切到mongoDB的bin目录下，执行以下命令：

mongod --dbpath="path"

(3)

以下是一些简单操作：find，update，remove，insert

Microsoft Windows [版本 6.1.7601]版权所有 (c) 2009 Microsoft Corporation。保留所有权利。C:\Users\hitler>cd C:\Program Files\MongoDB\Server\3.0\binC:\Program Files\MongoDB\Server\3.0\bin>C:\Program Files\MongoDB\Server\3.0\bin>C:\Program Files\MongoDB\Server\3.0\bin>C:\Program Files\MongoDB\Server\3.0\bin>C:\Program Files\MongoDB\Server\3.0\bin>mongo2015-09-06T08:10:50.834+0800 I CONTROL  Hotfix KB2731284 or later update is notinstalled, will zero-out data filesMongoDB shell version: 3.0.6connecting to: test> db.person.find();{ "_id" : ObjectId("55e6bba17e3993ce5ef28b4d"), "name" : "jack", "age" : 20 }>>>> db.person.insert({"name":"herry","age":35});WriteResult({ "nInserted" : 1 })>>> db.person.find();{ "_id" : ObjectId("55e6bba17e3993ce5ef28b4d"), "name" : "jack", "age" : 20 }{ "_id" : ObjectId("55eb87ec18cec86012ca9338"), "name" : "herry", "age" : 35 }>>>> db.person.update({"name":jack},{"name":"jack","age":40});2015-09-06T08:26:51.619+0800 E QUERY    ReferenceError: jack is not defined    at (shell):1:26>>>> db.person.update({"name":"jack"},{"name":"jack","age":40});WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })>>>> db.person.find();{ "_id" : ObjectId("55e6bba17e3993ce5ef28b4d"), "name" : "jack", "age" : 40 }{ "_id" : ObjectId("55eb87ec18cec86012ca9338"), "name" : "herry", "age" : 35 }>> db.person.remove({"name":"jack"});WriteResult({ "nRemoved" : 1 })>>> db.person.find();{ "_id" : ObjectId("55eb87ec18cec86012ca9338"), "name" : "herry", "age" : 35 }>>>> db.person.remove();2015-09-06T08:28:43.364+0800 E QUERY    Error: remove needs a query    at Error (<anonymous>)    at DBCollection._parseRemove (src/mongo/shell/collection.js:305:32)    at DBCollection.remove (src/mongo/shell/collection.js:328:23)    at (shell):1:11 at src/mongo/shell/collection.js:305> db.person.remove();2015-09-06T08:29:09.680+0800 E QUERY    Error: remove needs a query    at Error (<anonymous>)    at DBCollection._parseRemove (src/mongo/shell/collection.js:305:32)    at DBCollection.remove (src/mongo/shell/collection.js:328:23)    at (shell):1:11 at src/mongo/shell/collection.js:305>> db.person.find();{ "_id" : ObjectId("55eb87ec18cec86012ca9338"), "name" : "herry", "age" : 35 }>>>> db.person.count();1>>

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