Error on second q1wery to Mysql Database - mysql

Question

When I send the first request after starting the server, it's okay.
But after updating the page (re-query), you receive an error:
app.get('/images', function(req, res, next) {
if (connection.state === 'disconnected'){
connection.connect();}
else {
}
var DATABASE='nodejsImage';
var results;
connection.query('use ' + DATABASE);
connection.query('SELECT `id`, `imagename`, `filename`, `speed`, `move` FROM `images` WHERE 1',
function (err, results, fields) {
if (err) return console.log("Error test") //throw err;
else {
console.log('Images list');
console.log('----------------------------------');
for (var i in results) {
var gadget = results[i];
console.log(gadget.id +': '+ gadget.imagename+': '+gadget.speed+': '+gadget.move);
}
res.render('imagelist', { title: 'Imagelist',listImages:results });
}
});
connection.end(); //разобраться с ошибкой позже!!!
});
Error message:
events.js:165
throw er; // Unhandled 'error' event
^
Error: Cannot enqueue Handshake after invoking quit.
at Protocol._validateEnqueue (E:\Dropbox\untitled5-upload-3\untitled5\node_modules\mysql\lib\protocol\Protocol.js:204:16)
at Protocol._enqueue (E:\Dropbox\untitled5-upload-3\untitled5\node_modules\mysql\lib\protocol\Protocol.js:139:13)
at Protocol.handshake (E:\Dropbox\untitled5-upload-3\untitled5\node_modules\mysql\lib\protocol\Protocol.js:52:23)
at Connection.connect (E:\Dropbox\untitled5-upload-3\untitled5\node_modules\mysql\lib\Connection.js:118:18)
at E:\Dropbox\untitled5-upload-3\untitled5\app.js:48:16
at Layer.handle [as handle_request] (E:\Dropbox\untitled5-upload-3\untitled5\node_modules\express\lib\router\layer.js:95:5)
at next (E:\Dropbox\untitled5-upload-3\untitled5\node_modules\express\lib\router\route.js:137:13)
at Route.dispatch (E:\Dropbox\untitled5-upload-3\untitled5\node_modules\express\lib\router\route.js:112:3)
at Layer.handle [as handle_request] (E:\Dropbox\untitled5-upload-3\untitled5\node_modules\express\lib\router\layer.js:95:5)
at E:\Dropbox\untitled5-upload-3\untitled5\node_modules\express\lib\router\index.js:281:22
Emitted 'error' event at:
at Connection._handleProtocolError (E:\Dropbox\untitled5-upload-3\untitled5\node_modules\mysql\lib\Connection.js:425:8)
at Protocol.emit (events.js:180:13)
at Protocol._delegateError (E:\Dropbox\untitled5-upload-3\untitled5\node_modules\mysql\lib\protocol\Protocol.js:392:10)
at Handshake.<anonymous> (E:\Dropbox\untitled5-upload-3\untitled5\node_modules\mysql\lib\protocol\Protocol.js:221:10)
at Handshake.emit (events.js:180:13)
at Handshake.Sequence.end (E:\Dropbox\untitled5-upload-3\untitled5\node_modules\mysql\lib\protocol\sequences\Sequence.js:83:12)
at E:\Dropbox\untitled5-upload-3\untitled5\node_modules\mysql\lib\protocol\Protocol.js:225:14
at process._tickCallback (internal/process/next_tick.js:112:11)

Answer 1

It are easy way to add pass items
to view.
var imageList = [];
// Connect to MySQL database.
var connection = getMySQLConnection();
connection.connect();
// Do the query to get data.
connection.query('SELECT * FROM images', function(err, rows, fields) {
if (err) {
res.status(500).json({"status_code": 500,"status_message": "internal server error"});
} else {
// Loop check on each row
for (var i = 0; i < rows.length; i++) {
// Create an object to save current row's data
var person = {
'id':rows[i].id,
'imagename':rows[i].imagename,
'filename':rows[i].filename,
'speed':rows[i].speed,
'move':rows[i].move
}
// Add object into array
imageList.push(person);
}
// Render index.pug page using array
res.render('imagelist', { title: 'Imagelist',listImages:imageList });
}
});
// Close the MySQL connection
connection.end();