NodeJS:Heroku ClearDB未关闭连接

时间:2017-09-02 15:19:26

标签: mysql node.js heroku cleardb

我在Heroku上部署了一个NodeJS API,并尝试将其连接到MySQL数据库,因此我创建了一个connectionPool来处理ClearDB点火帐户(免费)上的连接,最多允许10个连接。

每次我对数据库执行查询时,它只会向堆栈添加一个新连接,直到它达到10个连接并且应用程序崩溃。

我的代码如下:

connectionFactory的:

var mysql = require('mysql');

function createDBConnection() {
    var conn = mysql.createPool({
      host: 'xxx',
      user: 'xxx',
      password: 'xxx',
      database: 'xxx'
    });
    return conn;
}

module.exports = function() {
  return createDBConnection;
}

这是我的选择查询:

function Dao(connection) {
  this._connection = connection;
}

Dao.prototype.findAll = function (callback) {
  this._connection.query('SELECT * FROM table',
  function(errors, results) {
    callback(errors,results);
  });
};

module.exports = function() {
  return Dao;
}

最后这是我用来称呼它的路线:

app.get('/products', function (req,res) {
    var connection = app.persistence.connectionFactory();
    var dao = new app.persistence.Dao(connection);

    dao.findAll(function (err, result) {
      res.format({
        json: function () {
          res.json(result);
        }
      });
    });
  });

我尝试将createPool()更改为createConnection(),然后在每次查询后立即调用.end()/。destroy()函数,但它根本不起作用。

任何提示?

1 个答案:

答案 0 :(得分:0)

要关闭连接/返回与池的连接,请使用:connection.release()

var mysql = require('mysql');
var pool  = mysql.createPool(...);

pool.getConnection(function(err, connection) {
  // Use the connection
  connection.query('SELECT something FROM sometable', function (error, results, fields) {
    // And done with the connection.
    connection.release();

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

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

mysql : Pooling connections Documentation