Question

当没有对mysql的请求时，我将遇到此错误，它将进入空闲状态，而我们将遇到此db错误。我正在使用节点，将mysql部署到openshift集群上。

如何使数据库连接保持活动状态，以使服务器永不关闭连接？ PFA 请让我知道有什么解决方案吗？我被困了两个星期了

更新- 以下是我正在使用的代码

                  `var connection;
                    function handleDisconnect() {
                    connection = mysql.createConnection({
                        host: config.db.host,
                        user: config.db.user,
                        password: config.db.password,
                        database: config.db.database,
                        port: config.db.port,
                    }); // 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();`

Answer 1

由于使用的是Node.js，因此可以使用连接池。

pooling-connections

以下是该链接的摘录。请注意，connection.release();不会破坏连接，但允许再次使用该连接。

var mysql = require('mysql');
var pool  = mysql.createPool({
  connectionLimit : 10,
  host            : 'example.org',
  user            : 'bob',
  password        : 'secret',
  database        : 'my_db'
});
pool.getConnection(function(err, connection) {
  if (err) throw err; // not connected!

  // Use the connection
  connection.query('SELECT something FROM sometable', function (error, results, fields) {
    // When done with the connection, release it.
    connection.release();

    // Handle error after the release.
    if (error) throw error;

    // Don't use the connection here, it has been returned to the pool.
  });
});

DB错误：连接丢失：服务器关闭了连接

1 个答案: