使用 Node.JS 查询 MySQL 并在网页中显示结果

Question

My goal is to query MySQL with Node.JS for better interactivity. My query is a simple SELECT with JOIN s. I managed to construct a script that displays results in the console but I'm kind of stuck when it comes to display it in the webpage. Here is my code:

var mysql = require('mysql');

var mySqlClient = mysql.createConnection({
    host    : 'server',
    user    : 'login',
    password: 'pwd',
    database: 'db'
});

var selectQuery = 'SELECT fields FROM table t1\
                   INNER JOIN table t2\
                   ON t1.field = t2.field';
mySqlClient.query(
    selectQuery,
    function select(error, results, fields) {
        if(error) {
            console.log(error);
            mySqlClient.end();
            return;
        }

        if(results.length > 0) {
            console.log(results);
        } else {
            console.log('No data');
        }
        mySqlClient.end();
    });

What is the best approach to include this into the webpage? Do I need to create a httpServer with Node.JS?

Many thanks for any help!

EDIT I would like to use Node.JS inside a PHP application designed with Zend Framework. The Node.JS app wouldn't be the sole app of my project.

Answer 1

Easiest way would be to use a node framework. Like express .

You will be doing something like

/*** omitting generic code for clarity ***/
app.get('/yourpage',function(req,res){

    //On request of this page initiating sql query. Assumes that the object initialization is done above.
    mySqlClient.query(
    selectQuery,
    function select(error, results, fields) {
        if(error) {
            console.log(error);
            mySqlClient.end();
            //render the template with error to be alerted
            res.render('tempaltefile',{data:null,error:error});                
        }

        if(results.length > 0) {
            //console.log(results);
            //render the template with fetched data
            res.render('tempaltefile',{data:results,error:null});
        } else {
            //console.log('No data');
            //render the template with empty data alert
            res.render('tempaltefile',{data:null,error:"no data"});
        }
        mySqlClient.end();
    });

});

reply to comments

please mention you are using this along side ph code. I think you have to biuld the node code an api and consume it in the php end.

Answer 2

I was in the same situation as you, I could not connect to MySQL Zend since NodeJS. My solution was to use:

• Node-mysql plugin (command to install into nodejs consol: npm install mysql )

• Install the MySQL ODBC connector ( http://dev.mysql.com/downloads/connector/ ) plugin.

Finally, restart the computer to apply the new install.

• In your server.js file, you can use this code to connect to your HostDB:

  var app = require('http').createServer(handler), mysql = require('mysql'), connectionsArray = [], connection = mysql.createConnection({ host: 'localhost', user: 'USERNAME MYSQL', password: 'PASSWORD MYSQL', database: 'NAME MYSQLDATABASE', port: 3306 });

Answer 3

app.post('/qr', function(req, res) {
  console.log("Check QR code.");
  let now = moment().format('MMMM Do YYYY, h:mm:ss a');
  let subnow = now.substr(0, 8);
  let subnowwild = subnow + "%";
  connection.query("select exists (select * from visit where timeIn like ?)", subnowwild, function(err, result) {
  if (err) throw err;
  console.log(result);
    if(result = 0) {
     res.redirect(307, '/savedata');
    }
    else {
     res.redirect(307, '/updatedata');
    }
  });
});

So I wanted to see what a response was like when getting data with mysql and this webpage showed up but did not show the answer I was looking for.

You can also use res.send(result); if you want the query to return the data as a json response.