mysql - 连接丢失服务器关闭连接 - 致命错误后无法排队查询
问题描述
一旦服务器关闭 TCP 连接,我就会收到错误消息。该错误看起来与此问题相同
Error: Connection lost: The server closed the connection.
at Protocol.end (/opt/node-v0.10.20-linux-x64/IM/node_modules/mysql/lib/protocol/Protocol.js:73:13)
at Socket.onend (stream.js:79:10)
at Socket.EventEmitter.emit (events.js:117:20)
at _stream_readable.js:920:16
at process._tickCallback (node.js:415:13)
所以为了解决这个问题,我使用了这个问题中发布的答案。我做了这个
var mysql = require('mysql');
var db_config = {
host : 'localhost',
user : 'xxxx',
password : 'xxxx',
database : 'xxxx'
}
var connection;
function handleDisconnect() {
connection = mysql.createConnection(db_config); // Recreate the connection, since
// the old one cannot be reused.
connection.connect(function(err) { // The server is either down
if(err) { // or restarting (takes a while sometimes).
console.log('error when connecting to db:', err);
setTimeout(handleDisconnect, 2000); // We introduce a delay before attempting to reconnect,
} // 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.
connection.on('error', function(err) {
console.log('db error', err);
if(err.code === 'PROTOCOL_CONNECTION_LOST') { // Connection to the MySQL server is usually
handleDisconnect(); // lost due to either server restart, or a
} else {
console.log('error is err:', err); // connnection idle timeout (the wait_timeout
// throw err; // server variable configures this)
}
});
}
handleDisconnect();
module.exports = connection;
直到今天,当我遇到用户没有收到通知等问题时,我的程序才崩溃。因为它与数据库有关。所以当我检查日志文件时。这是错误
sql error isError: ER_QUERY_INTERRUPTED: Query execution was interrupted
db error { Error: Connection lost: The server closed the connection.
at Protocol.end (/var/www/html/mysite/node/node_modules/mysql/lib/protocol/Protocol.js:112:13)
at Socket.<anonymous> (/var/www/html/mysite/node/node_modules/mysql/lib/Connection.js:97:28)
at Socket.<anonymous> (/var/www/html/mysite/node/node_modules/mysql/lib/Connection.js:502:10)
at emitNone (events.js:111:20)
at Socket.emit (events.js:208:7)
at endReadableNT (_stream_readable.js:1064:12)
at _combinedTickCallback (internal/process/next_tick.js:138:11)
at process._tickCallback (internal/process/next_tick.js:180:9) fatal: true, code: 'PROTOCOL_CONNECTION_LOST' }
error when connecting to db: { Error: connect ECONNREFUSED 127.0.0.1:3306
at Object._errnoException (util.js:992:11)
at _exceptionWithHostPort (util.js:1014:20)
at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1186:14)
然后它继续在我的日志文件中打印这个上面的错误,以及这个
Cannot enqueue Query after fatal error.
请帮我解决这个问题。我必须重新启动服务器才能使其正常工作
解决方案
推荐阅读
- django - Django Form 无效但没有给我错误
- datagrid - 如何有条件地显示 oroinc 前端数据网格?
- c# - 并行 Ping 多个 IP 地址 - C#
- indexeddb - 由于版本需要升级时如何使用 localforage.js 清除 indexedDB
- nginx - Nginx 反向代理根 URI 问题
- c++ - 直接在 Rcpp 中使用 (c)igraph(即,不经过 R)
- c++ - 如何在 VisualStudio 中对 main() 进行单元测试
- java - 创建一个新变量并检查它是否为空
- oracle - 如何以表格形式创建动态动作创建
- node.js - 创建单例快递应用程序实例是否安全