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Docs/数据库/mongodb/MongoDB数据表基本操作.html
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<h1 class="title" id="leanote-title">MongoDB数据表基本操作</h1>
<div class="content-html" id="leanote-content"><p>查看全部数据表</p><pre id="leanote_ace_1479781232163_0" class="brush:sh ace-tomorrow">&gt;&nbsp;use&nbsp;ChatRoom
switched&nbsp;to&nbsp;db&nbsp;ChatRoom
&gt;&nbsp;show&nbsp;collections
Account
Chat
system.indexes
system.users</pre><p>创建数据表</p><pre id="leanote_ace_1479781278873_0" class="brush:sh ace-tomorrow">&gt;&nbsp;db.createCollection("Account")
{"ok":1}</pre><pre id="leanote_ace_1479781293825_0" class="brush:sh ace-tomorrow">&gt;&nbsp;db.createCollection("Test",{capped:true,&nbsp;size:10000})&nbsp;{&nbsp;"ok"&nbsp;:&nbsp;1&nbsp;}
{"ok":1}</pre><p>-- 说明</p><p>capped:true，表示该集合的结构不能被修改；</p><p>size:在建表之初就指定一定的空间大小，接下来的插入操作会不断地按顺序APPEND数据在这个预分配好空间的文件中，如果已经超出空间大小，则回到文件头覆盖原来的数据继续插入。这种结构保证了插入和查询的高效性，它不允许删除单个记录，更新的也有限制：不能超过原有记录的大小。这种表效率很高，它适用于一些暂时保存数据的场合，比如网站中登录用户的session信息，又比如一些程序的监控日志，都是属于过了一定的时间就可以被覆盖的数据。</p><p>&nbsp;<br></p><p>修改数据表名</p><pre id="leanote_ace_1479781320849_0" class="brush:sh ace-tomorrow">&gt;&nbsp;db.Account.renameCollection("Account1")
{&nbsp;"ok"&nbsp;:&nbsp;1&nbsp;}</pre><p>&nbsp;<br></p><p>数据表帮助主题help</p><pre id="leanote_ace_1479781866930_0" class="brush:sh ace-tomorrow">&gt;&nbsp;db.Account.help()
DBCollection&nbsp;help
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;db.Account.find().help()&nbsp;-&nbsp;show&nbsp;DBCursor&nbsp;help
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;db.Account.count()
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;db.Account.dataSize()
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;db.Account.distinct(&nbsp;key&nbsp;)&nbsp;-&nbsp;eg.&nbsp;db.Account.distinct(&nbsp;'x'&nbsp;)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;db.Account.drop()&nbsp;drop&nbsp;the&nbsp;collection
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;db.Account.dropIndex(name)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;db.Account.dropIndexes()
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;db.Account.ensureIndex(keypattern[,options])&nbsp;-&nbsp;options&nbsp;is&nbsp;an&nbsp;object&nbsp;with&nbsp;these&nbsp;possible&nbsp;fields:&nbsp;name,&nbsp;unique,&nbsp;dropDups
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;db.Account.reIndex()
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;db.Account.find([query],[fields])&nbsp;-&nbsp;query&nbsp;is&nbsp;an&nbsp;optional&nbsp;query&nbsp;filter.&nbsp;fields&nbsp;is&nbsp;optional&nbsp;set&nbsp;of&nbsp;fields&nbsp;to&nbsp;retur.
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;e.g.&nbsp;db.Account.find(&nbsp;{x:77}&nbsp;,&nbsp;{name:1,&nbsp;x:1}&nbsp;)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;db.Account.find(...).count()
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;db.Account.find(...).limit(n)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;db.Account.find(...).skip(n)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;db.Account.find(...).sort(...)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;db.Account.findOne([query])
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;db.Account.findAndModify(&nbsp;{&nbsp;update&nbsp;:&nbsp;...&nbsp;,&nbsp;remove&nbsp;:&nbsp;bool&nbsp;[,&nbsp;query:&nbsp;{},&nbsp;sort:&nbsp;{},&nbsp;'new':&nbsp;false]&nbsp;}&nbsp;)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;db.Account.getDB()&nbsp;get&nbsp;DB&nbsp;object&nbsp;associated&nbsp;with&nbsp;collection
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;db.Account.getIndexes()
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;db.Account.group(&nbsp;{&nbsp;key&nbsp;:&nbsp;...,&nbsp;initial:&nbsp;...,&nbsp;reduce&nbsp;:&nbsp;...[,&nbsp;cond:&nbsp;...]&nbsp;}&nbsp;)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;db.Account.mapReduce(&nbsp;mapFunction&nbsp;,&nbsp;reduceFunction&nbsp;,&nbsp;&lt;optional&nbsp;params&gt;&nbsp;)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;db.Account.remove(query)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;db.Account.renameCollection(&nbsp;newName&nbsp;,&nbsp;&lt;dropTarget&gt;&nbsp;)&nbsp;renames&nbsp;the&nbsp;collection.
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;db.Account.runCommand(&nbsp;name&nbsp;,&nbsp;&lt;options&gt;&nbsp;)&nbsp;runs&nbsp;a&nbsp;db&nbsp;command&nbsp;with&nbsp;the&nbsp;given&nbsp;name&nbsp;where&nbsp;the&nbsp;first&nbsp;param&nbsp;is&nbsp;the&nbsp;collection&nbsp;name
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;db.Account.save(obj)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;db.Account.stats()
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;db.Account.storageSize()&nbsp;-&nbsp;includes&nbsp;free&nbsp;space&nbsp;allocated&nbsp;to&nbsp;this&nbsp;collection
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;db.Account.totalIndexSize()&nbsp;-&nbsp;size&nbsp;in&nbsp;bytes&nbsp;of&nbsp;all&nbsp;the&nbsp;indexes
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;db.Account.totalSize()&nbsp;-&nbsp;storage&nbsp;allocated&nbsp;for&nbsp;all&nbsp;data&nbsp;and&nbsp;indexes
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;db.Account.update(query,&nbsp;object[,&nbsp;upsert_bool,&nbsp;multi_bool])
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;db.Account.validate()&nbsp;-&nbsp;SLOW
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;db.Account.getShardVersion()&nbsp;-&nbsp;only&nbsp;for&nbsp;use&nbsp;with&nbsp;sharding&nbsp;</pre><p>&nbsp;<br></p><p>查看全部表记录</p><pre id="leanote_ace_1479782012602_0" class="brush:sh ace-tomorrow">&gt;&nbsp;db.Account.find()
{&nbsp;"_id"&nbsp;:&nbsp;ObjectId("4df08553188e444d001a763a"),&nbsp;"AccountID"&nbsp;:&nbsp;1,&nbsp;"UserName"&nbsp;:&nbsp;"libing",&nbsp;"Password"&nbsp;:&nbsp;"1",&nbsp;"Age"&nbsp;:&nbsp;26,&nbsp;"Email"&nbsp;:&nbsp;"libing@126.com",&nbsp;"RegisterDate"&nbsp;:&nbsp;"2011-06-09&nbsp;16:31:25"&nbsp;}
{&nbsp;"_id"&nbsp;:&nbsp;ObjectId("4df08586188e444d001a763b"),&nbsp;"AccountID"&nbsp;:&nbsp;2,&nbsp;"UserName"&nbsp;:&nbsp;"lb",&nbsp;"Password"&nbsp;:&nbsp;"1",&nbsp;"Age"&nbsp;:&nbsp;25,&nbsp;"Email"&nbsp;:&nbsp;"libing@163.com",&nbsp;"RegisterDate"&nbsp;:&nbsp;"2011-06-09&nbsp;16:36:95"&nbsp;}</pre><p>&nbsp;<br></p></div>
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