couchDB学习笔记
by 司徒正美
at 2012-08-24 22:28:00
original http://www.cnblogs.com/rubylouvre/archive/2012/08/24/2653863.html
couchDB是一个非常易用的nosql数据库，到官网下载安装并启动它，然后新建一JS文件：
var http = require('http');var options = { port: 5984, method: 'GET', // path:"/_all_dbs"};//这个回调果真只有一个参数，即http.createServer(function(req, res) {})var req = http.request(options, function(res) { console.log('STATUS: ' + res.statusCode); console.log('HEADERS: ' + JSON.stringify(res.headers)); res.setEncoding('utf8'); var body = "" res.on('data', function (chunk) { body += chunk }); res.once("end", function(){ var json = JSON.parse(body); console.log(json) })});req.end()req.on('error', function(e) { console.log('problem with request: ' + e.message);});
然后用node.js打开它！控制台输出如下消息，表示成功：
STATUS: 200HEADERS: {"server":"CouchDB/1.2.0 (Erlang OTP/R14B04)","date":"Fri, 24 Aug 201202:53:18 GMT","content-type":"text/plain; charset=utf-8","content-length":"40","cache-control":"must-revalidate"}{ couchdb: 'Welcome', version: '1.2.0' }
然后我们修改一下上面的options对象，查看里面已经有多少个数据库
var options = { port: 5984, method: 'GET', path:"/_all_dbs"};
会输出一个数组
[ '_replicator', '_users' ]
创建一个数据库，为PUT请求，path为数据库名
var options = { port: 5984, method: 'PUT', path:"/aaa"};
输出ok=true表示成功
{ ok: true }
注,不能重复创建相同数据库,我们试再发一次上面的请求,会返回上面请求
{ error: 'file_exists', reason: 'The database could not be created, the file already exists.' }
删除一个数据库就用DELETE请求,path为数据库名
var options = { port: 5984, method: 'DELETE', path:"/aaa"};
在一个数据库内插入一条记录,因为上面的aaa被我们删掉了, 我们就再搞个albums
var options = { port: 5984, method: 'PUT', path:"/albums"};
插入新记录,记录在nosql数据库大多数称之为文档.它要求有一个UUID,你就随便造一个吧
var http = require('http');//创建一个名为baseball的数据库var options = { port: 5984, method: 'PUT', path:"/albums/1"};var req = http.request(options, function(res) { console.log('STATUS: ' + res.statusCode); console.log('HEADERS: ' + JSON.stringify(res.headers)); res.setEncoding('utf8'); var body = "" res.on('data', function (chunk) { body += chunk }); res.once("end", function(){ var json = JSON.parse(body); console.log(json) })});req.setHeader("Content-Type", "application/json")//这时请补上文档内容req.write(JSON.stringify({ "title":"There is Nothing Left to Lose", "artist":"Foo Fighters"}))req.end()req.on('error', function(e) { console.log('problem with request: ' + e.message);});
当然,上面这样搞出来的UUID太不安全了,因此你可以利用couthDB给你的UUID
var options = { port: 5984, method: 'GET', path:"/_uuids"};
我们再把刚才保存的文档取出来吧,就是数据库加ID名,GET请求
var options = { port: 5984, method: 'GET', path:"/albums/1"};