Apache CouchDB

2010年10月5日 (二) 13:16的版本

您可以在Wikipedia上了解到此条目的英文信息 Apache CouchDB Thanks, Wikipedia.

简介

CouchDB是一个文档数据库；它是一个支持复制的（Replecated）文档数据库，具有REST接口，也就是说可以在 HTTP上，用标准的GET、PUT、POST动词去访问。而且它用JavaScript作为查询语言去建立数据视图（View）。在SQL数据库里，你要定义各种表和表中的数据类型及大小，CouchDB不一样，它是没有Schema的。在CouchDB里，每个文档都是独立的对象，可以是任意的 JSON结构。这是技术上的表述。那么它的优点在哪里呢？它有利于构建很多协作型的应用，很多Web应用都是围绕着文档、上下文、任务、Bug报告，诸如此类的东西。这些就是CouchDB最擅长的方面。

相似项目: MongoDB

CouchDB和Lotus Notes最接近, 其核心就是文档模型.

Apache CouchDB Sketch

CouchDB创造者Damien Katz畅谈CouchDB

Install

Windows

先安装 Erlang, 再安装 CouchDB

启动 C:\erl5.7.2\bin\couch_start.bat

访问 http://localhost:5984/_utils/index.html

Database

A CouchDB database is a flat collection of these documents.

CouchDB Document

A CouchDB document is simply a JSON object.

A CouchDB document is an object that consists of named fields. Field values may be strings, numbers, dates, or even ordered lists and associative maps. An example of a document would be a blog post:

"Subject": "I like Django"  
"Author": "Allen"  
"PostedDate": "5/23/2009"  
"Tags": ["Python", "Django", "Framework"]
"Body": "Django is a high-level Python Web framework that encourages rapid development and clean, I like Django."

CouchDB Views

Views are the primary tool used for querying and reporting on CouchDB documents. There are two different kinds of views: permanent and temporary views.

Views are defined with Javascript functions. Here is the very simplest function:

function(doc) {
  emit(null, doc);
}

Python

Powered by

dotCloud open-source cloud federation platform
Ajatus CRM A CRM that runs as a local Ajax web application
Couchit minimal site creator
http://scratchpad.cmlenz.net/
http://wiki.apache.org/couchdb/CouchDB_in_the_wild

Links

<discussion>characters_max=300</discussion>

@@ 第3行： / 第3行： @@
 [[Image:Couchdb-90x90.gif|right]]
-Apache CouchDB is document oriented, schema-free database similar to Amazon SimpleDB and Google BigTable.
-Apache CouchDB is a distributed, fault-tolerant and schema-free document-oriented database accessible via a RESTful HTTP/JSON API. Among other features, it provides robust, incremental replication with bi-directional conflict detection and resolution, and is queryable and indexable using a table-oriented view engine with JavaScript acting as the default view definition language.
-[[Image:Apache-CouchDB-Sketch.png|right|thumb|Apache CouchDB Sketch]]
-CouchDB is written in [[Erlang]], but can be easily accessed from any environment that provides means to make HTTP requests. There are a multitude of third-party client libraries that make this even easier for a variety of programming languages and environments.
-相似项目: [[MongoDB]]
 ==简介==
 CouchDB是一个文档数据库；它是一个支持复制的（Replecated）文档数据库，具有REST接口，也就是说可以在 HTTP上，用标准的GET、PUT、POST动词去访问。而且它用JavaScript作为查询语言去建立数据视图（View）。在SQL数据库里，你要定义各种表和表中的数据类型及大小，CouchDB不一样，它是没有Schema的。在CouchDB里，每个文档都是独立的对象，可以是任意的 JSON结构。这是技术上的表述。那么它的优点在哪里呢？它有利于构建很多协作型的应用，很多Web应用都是围绕着文档、上下文、任务、Bug报告，诸如此类的东西。这些就是CouchDB最擅长的方面。
+相似项目: [[MongoDB]]
 CouchDB和Lotus Notes最接近, 其核心就是文档模型.
+[[Image:Apache-CouchDB-Sketch.png|right|thumb|Apache CouchDB Sketch]]
 [http://www.infoq.com/cn/interviews/CouchDB-Damien-Katz-cn CouchDB创造者Damien Katz畅谈CouchDB]
 ==Install==
@@ 第68行： / 第63行： @@
 {{Comment}}
-[[Category:Database]]
+[[Category:NoSQL]]
 [[Category:Erlang]]
 [[Category:Apache]]