学习了一下Nodejs和MongoDB，写了个示例程序，读取数据库中产品的列表。 JS代码如下：
/**
* Nodejs和MongoDB的简单示例
*
* @param
* @arrange (512.笔记) jb51.cc
**/
var http = require("http"),mongo = require("mongodb"),events = require("events");
http.createServer(function(req,res) {
var products_emitter = new events.EventEmitter(),// 创建到northwind数据库的链接。相当于use northwind
db = new mongo.Db("northwind",new mongo.Server('localhost',27017,{}),{});
var listener = function(products) {
var html = [],len = products.length;
html.push('<!DOCTYPE html>');
html.push('<html>');
html.push('<head>');
html.push('<title>Nodejs</title>');
html.push('</head>');
html.push('<body>');
if(len > 0) {
html.push('<ul>');
for(var i = 0; i < len; i++) {
html.push('<li>' + products[i].name + '</li>');
}
html.push('</ul>');
}
html.push('</body>');
html.push('</html>');
res.writeHead(200,"Content-Type: text/html");
res.write(html.join(''));
res.end();
clearTimeout(timeout);
}
products_emitter.on('products',listener);
var timeout = setTimeout(function() {
products_emitter.emit('products',[]);
products_emitter.removeListener('products',listener);
},10000);
db.open(function() {
// 打开名为products的表
db.collection("products",function(err,collection) {
// select * from products 相当于db.products.find()
collection.find(function(err,cursor) {
cursor.toArray(function(err,items) {
products_emitter.emit('products',items);
});
});
});
});
}).listen(8000);
console.log("Started");