use connection encoding in Query packet serializetion

Author: sidorares

lib/packets/query.js

@@ -2,25 +2,26 @@ var Buffer = require('safe-buffer').Buffer;
 var Packet = require('../packets/packet.js');
 var CommandCode = require('../constants/commands.js');
 var StringParser = require('../parsers/string.js');
+var CharsetToEncoding = require('../constants/charset_encodings.js');
+
 
 function Query (sql, charsetNumber)
 {
   this.query = sql;
   this.charsetNumber = charsetNumber;
+  this.encoding = CharsetToEncoding[charsetNumber];
 }
 
 Query.prototype.toPacket = function ()
 {
-  // TODO: use this.charsetNumber and get proper encoding type
-  var buf = StringParser.encode(this.query, 'cesu8');
+  var buf = StringParser.encode(this.query, this.encoding);
   var length = 5 + buf.length;
 
   var buffer = Buffer.allocUnsafe(length);
   var packet = new Packet(0, buffer, 0, length);
   packet.offset = 4;
   packet.writeInt8(CommandCode.QUERY);
-  // TODO: pass down encoding to this method too
-  packet.writeString(this.query, 'cesu8');
+  packet.writeBuffer(buf);
   return packet;
 };