Merge pull request #556 from eakorolev/patch-1

Errors can be more informative

Author: felixge

lib/protocol/sequences/Sequence.js

@@ -31,6 +31,8 @@ Sequence.prototype._packetToError = function(packet) {
   var code = ErrorConstants[packet.errno] || 'UNKNOWN_CODE_PLEASE_REPORT';
   var err  = new Error(code + ': ' + packet.message);
   err.code = code;
+  err.errno = packet.errno;
+  err.sqlState = packet.sqlState;
 
   return err;
 };