replaced mysql connection by connection pool, which handles automatic...

replaced mysql connection by connection pool, which handles automatic connection losts by inactivity

lib/blndRelDbRequest.js

@@ -19,7 +19,7 @@ var blndMapping = {
   "Mecklenburg-Vorpommern": "MV",
   "Thüringen": "TH"
 };
-var connection = mysql.createConnection(config["mysqlConfig"]);
+var connection = mysql.createPool(config["mysqlConfig"]);
 
 module.exports.getBundesland = function(plz, cb) {
   connection.query("SELECT bundesland FROM postleitzahlen WHERE plz = '" + plz + "'", function (err, result) {