[Node.js] Mysql - ReleaseConnection 에러

Cannot call method 'ReleaseConnection' of null

참조 페이지
https://github.com/dougwilson/node-mysql/commit/ef13ca08dfc8025a93c607656119b7abb3b3b2aa

// Release Connection시 에러가 날 때가 있는데요.
// 해결 방법입니다.


//  lib/PoolConnection.js 수정하기

PoolConnection.prototype.release = function () {
  if (!this._pool || this._pool._closed) {
      return;
    }
  return this._pool.releaseConnection(this);
};


//  test/integration/pool/test-destroy-connection.js 수정하기

var common     = require('../../common');
var assert     = require('assert');
var Connection = require(common.lib + '/Connection');
var pool       = common.createPool();

pool.getConnection(function(err, connection) {
  if (err) throw err;
  assert.strictEqual(connection, pool._allConnections[0]);
  connection.destroy();

  assert.ok(pool._allConnections.length == 0);
  assert.ok(!connection._pool);

  assert.doesNotThrow(function () { connection.release(); });
  
  pool.end();
});