nodejs mysql错误：连接丢失服务器关闭了连接

Z时代
2024-01-10
分类：问答

当我使用节点mysql时，在12:00到2:00之间出现错误，表明服务器已关闭TCP连接。这是完整的消息：

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)

有解决办法。但是，以这种方式尝试后，问题也会出现。现在我不知道该怎么办。有人遇到这个问题吗？

这是我按照解决方案编写的方式：

    var handleKFDisconnect = function() {
    kfdb.on('error', function(err) {
        if (!err.fatal) {
            return;
        }
        if (err.code !== 'PROTOCOL_CONNECTION_LOST') {
            console.log("PROTOCOL_CONNECTION_LOST");
            throw err;
        }
        log.error("The database is error:" + err.stack);
        kfdb = mysql.createConnection(kf_config);
        console.log("kfid");
        console.log(kfdb);
        handleKFDisconnect();
    });
   };
   handleKFDisconnect();

回答：

尝试使用以下代码来处理服务器断开连接：

var db_config = {
  host: 'localhost',
    user: 'root',
    password: '',
    database: 'example'
};
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 {                                      // connnection idle timeout (the wait_timeout
      throw err;                                  // server variable configures this)
    }
  });
}
handleDisconnect();