致命错误后节点JS Mysql协议排队 [英] Node JS Mysql PROTOCOL ENQUEUE AFTER FATAL ERROR

问题描述

错误是什么意思?

{ [Error: Cannot enqueue Query after fatal error.] code: 'PROTOCOL_ENQUEUE_AFTER_FATAL_ERROR', fatal: false }

此代码可在我的测试文件中使用:

This code works in my test file:

function handleDisconnect() {
    objConn = mysql.createConnection(db_config);    // Recreate the connection, since
                                                    // the old one cannot be reused.
    objConn.connect(function(err) {                 // The server is either down
        if(err) {                                   // or restarting (takes a while sometimes).
            console.log('error when connecting to db:', err.code);
            setTimeout(handleDisconnect, 2000);     // We introduce a delay before attempting to reconnect,
        }else{
            console.log('Connected to db!');
        }                                           // to avoid a hot loop, and to allow our node script to
    });                                             // process asynchronous requests in the meantime.
                                                    // If you're also serving http, display a 503 error.
    objConn.on('error', function(err) {
        if(err.code === 'PROTOCOL_CONNECTION_LOST') { // Connection to the MySQL server is usually
            handleDisconnect();                       // lost due to either server restart, or a
        }else{
            throw err;
        }
    });
}

handleDisconnect();
megaLoop();

function megaLoop(){
    objConn.query('SELECT u.`email` FROM `users` as u', function(err, rows) {
        console.log(err);
        console.log(rows);
    });
    setTimeout(megaLoop, 100); 
}

但是当我在Express App中使用该功能时，会出现错误:

But when I use the function in my Express App I get the error:

{ [Error: Cannot enqueue Query after fatal error.] code: 'PROTOCOL_ENQUEUE_AFTER_FATAL_ERROR', fatal: false }

为什么它在我的测试中而不在我的应用程序中起作用?

Why does it work in my test and not my app?

推荐答案

我认为问题是express-sql-session.我现在遇到同样的问题.我认为有人正在处理此帖子:

I believe the issue is an express-sql-session. I'm experiencing the same issue right now. I think someone is on to something at this post: NodeJS running on MAC, and have an error occurred when deploying on centOS

也请检查以下内容: https://github.com/felixge/node- mysql/issues/1166

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