更新 '数据库/mongodb/MongoDB数据表基本操作.md'
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<div class="note-container">
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<h1 class="title" id="leanote-title">MongoDB数据表基本操作</h1>
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<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">> use ChatRoom
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switched to db ChatRoom
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> show collections
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Account
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Chat
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system.indexes
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system.users</pre><p>创建数据表</p><pre id="leanote_ace_1479781278873_0" class="brush:sh ace-tomorrow">> db.createCollection("Account")
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{"ok":1}</pre><pre id="leanote_ace_1479781293825_0" class="brush:sh ace-tomorrow">> db.createCollection("Test",{capped:true, size:10000}) { "ok" : 1 }
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{"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> <br></p><p>修改数据表名</p><pre id="leanote_ace_1479781320849_0" class="brush:sh ace-tomorrow">> db.Account.renameCollection("Account1")
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{ "ok" : 1 }</pre><p> <br></p><p>数据表帮助主题help</p><pre id="leanote_ace_1479781866930_0" class="brush:sh ace-tomorrow">> db.Account.help()
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DBCollection help
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db.Account.find().help() - show DBCursor help
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db.Account.count()
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db.Account.dataSize()
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db.Account.distinct( key ) - eg. db.Account.distinct( 'x' )
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db.Account.drop() drop the collection
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db.Account.dropIndex(name)
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db.Account.dropIndexes()
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db.Account.ensureIndex(keypattern[,options]) - options is an object with these possible fields: name, unique, dropDups
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db.Account.reIndex()
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db.Account.find([query],[fields]) - query is an optional query filter. fields is optional set of fields to retur.
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e.g. db.Account.find( {x:77} , {name:1, x:1} )
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db.Account.find(...).count()
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db.Account.find(...).limit(n)
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db.Account.find(...).skip(n)
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db.Account.find(...).sort(...)
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db.Account.findOne([query])
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db.Account.findAndModify( { update : ... , remove : bool [, query: {}, sort: {}, 'new': false] } )
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db.Account.getDB() get DB object associated with collection
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db.Account.getIndexes()
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db.Account.group( { key : ..., initial: ..., reduce : ...[, cond: ...] } )
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db.Account.mapReduce( mapFunction , reduceFunction , <optional params> )
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db.Account.remove(query)
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db.Account.renameCollection( newName , <dropTarget> ) renames the collection.
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db.Account.runCommand( name , <options> ) runs a db command with the given name where the first param is the collection name
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db.Account.save(obj)
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db.Account.stats()
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db.Account.storageSize() - includes free space allocated to this collection
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db.Account.totalIndexSize() - size in bytes of all the indexes
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db.Account.totalSize() - storage allocated for all data and indexes
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db.Account.update(query, object[, upsert_bool, multi_bool])
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db.Account.validate() - SLOW
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db.Account.getShardVersion() - only for use with sharding </pre><p> <br></p><p>查看全部表记录</p><pre id="leanote_ace_1479782012602_0" class="brush:sh ace-tomorrow">> db.Account.find()
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{ "_id" : ObjectId("4df08553188e444d001a763a"), "AccountID" : 1, "UserName" : "libing", "Password" : "1", "Age" : 26, "Email" : "libing@126.com", "RegisterDate" : "2011-06-09 16:31:25" }
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{ "_id" : ObjectId("4df08586188e444d001a763b"), "AccountID" : 2, "UserName" : "lb", "Password" : "1", "Age" : 25, "Email" : "libing@163.com", "RegisterDate" : "2011-06-09 16:36:95" }</pre><p> <br></p></div>
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<!-- 该js供其它处理 -->
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<script src="../leanote-html.js"></script>
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78
数据库/mongodb/MongoDB数据表基本操作.md
Normal file
78
数据库/mongodb/MongoDB数据表基本操作.md
Normal file
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# MongoDB数据表基本操作
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## 查看全部数据表
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```bash
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> use ChatRoom
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switched to db ChatRoom
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> show collections
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Account
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Chat
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system.indexes
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system.users
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```
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## 创建数据表
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```bash
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> db.createCollection("Account")
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{"ok":1}
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> db.createCollection("Test",{capped:true, size:10000}) { "ok" : 1 }
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{"ok":1}
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```
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-- 说明
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capped:true，表示该集合的结构不能被修改；
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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。
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## 修改数据表名
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```bash
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> db.Account.renameCollection("Account1")
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{ "ok" : 1 }
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```
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## 数据表帮助主题help
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```bash
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> db.Account.help()
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DBCollection help
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db.Account.find().help() - show DBCursor help
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db.Account.count()
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db.Account.dataSize()
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db.Account.distinct( key ) - eg. db.Account.distinct( 'x' )
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db.Account.drop() drop the collection
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db.Account.dropIndex(name)
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db.Account.dropIndexes()
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db.Account.ensureIndex(keypattern[,options]) - options is an object with these possible fields: name, unique, dropDups
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db.Account.reIndex()
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db.Account.find([query],[fields]) - query is an optional query filter. fields is optional set of fields to retur.
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e.g. db.Account.find( {x:77} , {name:1, x:1} )
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db.Account.find(...).count()
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db.Account.find(...).limit(n)
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db.Account.find(...).skip(n)
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db.Account.find(...).sort(...)
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db.Account.findOne([query])
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db.Account.findAndModify( { update : ... , remove : bool [, query: {}, sort: {}, 'new': false] } )
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db.Account.getDB() get DB object associated with collection
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db.Account.getIndexes()
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db.Account.group( { key : ..., initial: ..., reduce : ...[, cond: ...] } )
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db.Account.mapReduce( mapFunction , reduceFunction , <optional params> )
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db.Account.remove(query)
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db.Account.renameCollection( newName , <dropTarget> ) renames the collection.
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db.Account.runCommand( name , <options> ) runs a db command with the given name where the first param is the collection name
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db.Account.save(obj)
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db.Account.stats()
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db.Account.storageSize() - includes free space allocated to this collection
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db.Account.totalIndexSize() - size in bytes of all the indexes
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db.Account.totalSize() - storage allocated for all data and indexes
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db.Account.update(query, object[, upsert_bool, multi_bool])
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db.Account.validate() - SLOW
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db.Account.getShardVersion() - only for use with sharding
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```
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## 查看全部表记录
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```bash
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> db.Account.find()
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{ "_id" : ObjectId("4df08553188e444d001a763a"), "AccountID" : 1, "UserName" : "libing", "Password" : "1", "Age" : 26, "Email" : "libing@126.com", "RegisterDate" : "2011-06-09 16:31:25" }
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{ "_id" : ObjectId("4df08586188e444d001a763b"), "AccountID" : 2, "UserName" : "lb", "Password" : "1", "Age" : 25, "Email" : "libing@163.com", "RegisterDate" : "2011-06-09 16:36:95" }
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```
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