Error: Cannot enqueue Query after fatal error in mysql node

Question

I am using felixge/node-mysql. Also I am using express-myconnection which prevents mysql timeout and in turn prevents killing of node server. What I am doing is logging the

Answer 1

I had the same issue. Came across one solution -

Re-Install MySQl and while doing so, in the configuration step, select "legacy encryption" option instead and finish the installation.

Hope this helps!

Answer 2

Actually, I decided to google your error for you, and after reading this thread: https://github.com/felixge/node-mysql/issues/832 I realized that you're not releasing the connection after the first query completes, and so the pool never tries to issue you a new one. You were correct that the stale connection might be the problem. here's how you fix that if it is:

upload.on('begin', function (fileInfo, reqs, resp) { 
    var fileType = resp.req.fields.file_type;
    var originalFileName = fileInfo.name;
     var renamedFilename = file.fileRename(fileInfo,fileType);
    /*renaming the file */
    fileInfo.name = renamedFilename;

    /*start: log the details in database;*/
    var utcMoment = conf.moment.utc();
    var UtcSCPDateTime = new Date( utcMoment.format() );
    var activityData = {
        activity_type     : conf.LIST_UPLOAD_BEGIN,
        username          : test ,
        message           : 'test has started the upload process for the file',
        activity_datetime : UtcSCPDateTime 
    };
    reqs.params.activityData = activityData;
    req.getConnection(function(err,connection) {
    var dbData = req.params.activityData;
    var activity_type = dbData.activity_type;
    console.dir("[ Connection ID:- ] "+connection.threadId+' ] [ Activity type:- ] '+activity_type);
    var insertQuery = connection.query("INSERT INTO tblListmanagerActivityLog SET ? ",dbData, function(err, result) {
        if (err) {
            console.log("Error inserting while performing insert for activity "+activity_type+" : %s ",err );
        } else {
            console.log('Insert successfull');
        }
        /// Here is the change:
        connection.release();
    });

});
    /*end: log the details in database;*/
});

Answer 3

For pool connection to work we need to comment out https://github.com/pwalczyszyn/express-myconnection/blob/master/lib/express-myconnection.js#L84 this line. Hope it helps anyone facing the same issue.

Also we can use single connection option.