不支持选项[…]"/>
Mongodb：不支持选项[…]
[这里，我有一个服务器和一个进行ajax调用的html文件。发布时，我想将用户名和密码放入数据库中。当我首先加载客户端并发送信息时，它将成功进入数据库，但是如果我发送另一批信息，则会收到错误消息：以下是错误消息：
已成功连接到服务器将3个文档插入到收集选项[服务器]不支持这些选项不支持[caseTranslate]选项[dbName]不支持已成功连接到服务器将3个文档插入到集合
并且在重新启动服务器之前，我的数据库将不再填充。有人可以指出正确的方向吗？这是我在.on POST事件内部构造客户端连接的方式吗？
HTML
<!DOCTYPE html>
<html>
<head>
<title>
Little structure
</title>
</head>
<body>
<div id="demo">
<h1>Click ere</h1>
<button type="button" onclick="loadDoc()">Submit</button></br>
<input id = "userName"></input> </br>
<input id = "userPW" type = "password"></input></br>
</div>
<script>
function loadDoc() {
//get user value
var userName = document.getElementById("userName").value;
var userPW = document.getElementById("userPW").value;
//initiate POST request
var xhr = new XMLHttpRequest();
xhr.open("POST", 'server.js', false);
//Send the proper header information along with the request
xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
xhr.onreadystatechange = function() { // Call a function when the state changes.
if (this.readyState === XMLHttpRequest.DONE && this.status === 200) {
// Request finished. Do processing here.
}
}
xhr.send("userName=" + userName + "&userPW=" + userPW);
}
</script>
</body>
</html>
SERVER.js
var http = require('http');
var fs = require('fs');
var qs = require('querystring');
const MongoClient = require('mongodb').MongoClient;
const assert = require('assert').strict;
// Connection URL
const url = 'mongodb://localhost:27017';
// Database Name
const dbName = 'myproject';
// Create a new MongoClient
const client = new MongoClient(url);
var server = http.createServer(function (req, res) {
client.connect(function(err) {
assert.equal(null, err);
console.log("Connected successfully to server");
const db = client.db(dbName);
if(req.method == "GET")
{
if(req.url === '/'){
fs.readFile('home.html', function(err, data) {
res.writeHead(200, {'Content-Type': 'text/html'});
res.write(data);
res.end();
});
}
}
else if (req.method == 'POST') {
var body = '';
req.on('data', function (data){
body += data;
})
req.on('end', () => {
var postData = qs.parse(body);
// Use connect method to connect to the Server
// Get the documents collection
const collection = db.collection('doc');
// Insert some documents
collection.insertOne(postData, function(err, result) {
console.log(postData);
client.close();
});
res.end();
})
}
});
});
server.listen(3000);
console.log("listening on 3000");
如上面的评论所讨论的，解决此问题的方法是遵循Mongodb最佳实践，而不是每次将数据写入数据库时都关闭客户端的连接。
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