Question

我在启动节点8-12小时后收到错误。我已经为每小时设置了一个cron来查询我的sql数据库，并保持我的连接活着，尽管这种情况正在发生。

"stack": ["Error: Connection lost: The server closed the connection.", "    at Protocol.end (/path/to/my/file/node_modules/mysql/lib/protocol/Protocol.js:109:13)", "    at Socket.<anonymous> (/path/to/my/file/node_modules/mysql/lib/Connection.js:102:28)", "    at emitNone (events.js:72:20)", "    at Socket.emit (events.js:166:7)", "    at endReadableNT (_stream_readable.js:913:12)", "    at nextTickCallbackWith2Args (node.js:442:9)", "    at process._tickDomainCallback (node.js:397:17)"],
"level": "error",
"message": "uncaughtException: Connection lost: The server closed the connection.",
"timestamp": "2017-09-13T21:22:25.271Z"

让我解释一下我的代码。我有一个通用的mysql连接代码来传递我的所有API的.my常用数据库连接代码如下

var mysql = require('mysql');
var db_connect = (function () {
    function db_connect() {
        mysqlConnConfig = {
            host: "localhost",
            user: "username",
            password: "password",
            database: "db_name"
        };
    }
    db_connect.prototype.unitOfWork = function (sql) {
    mysqlConn = mysql.createConnection(mysqlConnConfig);
        try {
            sql(mysqlConn);
        } catch (ex) {

            console.error(ex);
        } finally {
            mysqlConn.end();
        }
    };
    return db_connect;
})();
exports.db_connect = db_connect;

所以我在我所有的API中都有这个功能

db_connect.prototype.unitOfWork = function (sql)

我将使用上述函数在我的所有API中查询我的数据库。

var query1 = "SELECT * FROM table1";
 sql.query(query1,function(error,response){
if(error){
    console.log(error);
}
else{
    console.log(response);
    }
 })

我已经尝试了好几次超过2周来解决这个问题，因为这会杀死我的节点，每当它发生故障时我都需要重新启动它。任何人都可以解决这个问题吗？我需要这个如何使用下面的代码并将其与我的代码结构（我的常见数据库连接文件）放在一起？

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();

任何帮助？

“错误：连接丢失：服务器关闭连接。，uncaughtException：连接丢失：服务器关闭了连接

0 个答案: