使用NodeJS / Express将数据加载到Snowflake

编程问答 2022-06-03

问题描述

我有一个带有单个按钮的简单HTML。 JavaScript（作为客户端脚本）捕获每次点击的时间。我对如何传递click的事件/时间发生并使用Node.js进行显示以稍后将其传输到SNowflake数据库中感到困惑。

从我的评论看来，解决方法是JSDOM，但是目前它引发了我一个错误。

以下是我评论的主题：

https://stackoverflow.com/questions/13840429/what-is-the-difference-between-client-side-and-server-side-programming

https://stackoverflow.com/questions/38748996/using-document-object-in-nodejs

[更新-2020年11月]

在阅读下面的内容之后，我想到了将项目分为3个文件的新代码。在将数据插入到SNowflake中仍需要帮助，不确定如何将click事件绑定到sql文本。总体目标是将点击事件的日期时间插入到SNowflake的表中：

https://gist.github.com/aerrity/fd393e5511106420fba0c9602cc05d35

进行中代码：

server.js 

console.log('Server-side code running');
const express = require('express');
const app = express();

// serve files from the public directory
app.use(express.static('public'));



//connect to sNowflake and load data
var sNowflake = require('sNowflake-sdk');
var connection = sNowflake.createConnection( {
    account: 'xxxx',username: 'xxxx',password: 'xxxx'
    }
    );

//confirm connection is working
connection.connect(
        function(err,conn) {
            if (err) {
                console.error('Unable to connect: ' + err.message);
                }
            else {
                console.log('Successfully connected to SNowflake.');
                // Optional: store the connection ID.
                connection_ID = conn.getId();
                }
            }
        );


// start the express web server listening on 8080
app.listen(8080,() => {
  console.log('listening on 8080');
});

// serve the homepage
app.get('/',(req,res) => {
  res.sendFile(__dirname + '/countClicks.html');
});



// insert data into sNowflake isues,how to bind click event?
connection.execute({
  sqlText: 'INSERT INTO DEMO_DB.PUBLIC.INPUT_NODEJS(CLICK_DATETIME)',binds: [/clicked]
});

countClicks.js 

const button = document.getElementById('clicks');
button.addEventListener('click',function(e) {
  console.log('button was clicked');

  fetch('/clicked',{method: 'POST'})
    .then(function(response) {
      if(response.ok) {
        console.log('Click was recorded');
        return;
      }
      throw new Error('Request Failed.');
    })
    .catch(function(error) {
      console.log(error);
    });
});

countClicks.html 

<!DOCTYPE html>
<html>
  <head>
    <Meta charset="utf-8">
    <title>Node + Express + SNowflake example</title>
  </head>
  <body>
    <h1>Node + Express + SNowflake example</h1>
    <p id="counter">Loading button click data.</p>
    <button id="myButton">Click me!</button>
  </body>
  <script src="countClicks.js"></script>
</html>

解决方法

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