오류는 안나는데 디비에 저장이안돼요ㅠ

Question

게시판 만드려고 안드로이드로 정보를 입력받아 디비에 저장하는 것에 도전중입니다.

회원가입에 성공하여 그대로 복붙하여 시도하였는데 에러는 안나지만 디비에 저장이안되네요ㅠㅠ

php파일과 자바코드를 올릴테니 도와주세요ㅠㅠ

<?php
$connect = mysql_connect("localhost", "dahyeon", "비밀번호");
mysql_selectdb("dahyeon");
mysql_query("set names utf8");

$title = $_REQUEST[title];
$content = $_REQUEST[content];

$qry = "insert into board(title, content) values('$title', '$content')";
$result = mysql_query($qry);

?>

php 파일입니다.

import android.app.*;
import android.content.Intent;
import android.os.*;
import android.widget.*;
import android.view.View.*;
import android.view.*;
import java.net.*;
import java.io.*;

public class Sell extends Activity {
	EditText w_title, w_content;
	String w_id, title, content;
	Button write;
	boolean reg_success;
	
	@Override
	public void onCreate(Bundle SavedInstance){
		super.onCreate(SavedInstance);
        setContentView(R.layout.sell);
        w_title = (EditText)findViewById(R.id.w_title);
        w_content = (EditText)findViewById(R.id.w_content);
        write= (Button)findViewById(R.id.write);        
        
        write.setOnClickListener(new OnClickListener(){
			@Override
			public void onClick(View v){
				lets_reg();
			}
		});
	}
	
	public void lets_reg(){
		title = w_title.getText().toString();
		content = w_content.getText().toString();
		RegTask RegTask = new RegTask ( );
		        RegTask.execute ();
		if( w_title.getText().toString().equals("") || w_content.getText().toString().equals("")) { //이름이나 가격중에 하나라도 입력이 안돼있을때
                    Toast.makeText(Sell.this,"모든 칸을 입력해주세요.", Toast.LENGTH_SHORT).show();
                    return;
		}
        else
        	Toast.makeText(Sell.this,"작성 완료.", Toast.LENGTH_SHORT).show();
			Intent ii = new Intent(getApplicationContext(),MainActivity.class);
	        startActivity(ii);
	        finish();
	}
	
	private class RegTask extends AsyncTask<String, Void, String> {	
		String sResult;
		
		@Override
		protected String doInBackground(String... sId) {
			sResult = "NO";
			
			try{
				String body = "title="+title+"&content="+content;
				URL u = new URL("http://dahyeon.dothome.co.kr/android/upload.php");
				
				HttpURLConnection  huc = (HttpURLConnection) u.openConnection();
				huc.setReadTimeout(4000);
				huc.setConnectTimeout(4000);
				huc.setRequestMethod("POST");
				huc.setDoInput(true);
				huc.setDoOutput(true);
				huc.setRequestProperty("utf-8", "application/x-www-form-urlencoded");
				
				OutputStream os = huc.getOutputStream();
				os.write( body.getBytes("utf-8") );
				os.flush();
				os.close();
				
				BufferedReader is = new BufferedReader(new InputStreamReader(huc.getInputStream(), "UTF-8"));
				int ch;
				StringBuffer sb = new StringBuffer();
				while ((ch = is.read()) != -1) {
					sb.append((char) ch);
				}
				if (is != null){
					is.close();
				}
				
				sResult = sb.toString();		
			}
			catch (Exception e){ 
			}
			return sResult;
		}
	}
	
	public String respondChecker(String respond){
		if (respond.contains("meta")){
			if (respond.contains("ERROR")){
				String oja = respond.substring(respond.indexOf(">")+1,respond.length());
				return oja;
			} 
			else if (respond.length() > 70){
				return "ERROR : 정보값 해석불가";
			} 
			else if (respond.contains("SUCCESS")) {
				reg_success = true;
				String nick = respond.substring(respond.indexOf(">")+1,respond.length());
				onRegSuccess();
				return nick.trim();
			} 
			else {
				return ErrorCatcher(respond);
			}
		} 
		else {
			return "";
		}
	}
	
	public String ErrorCatcher(String err){
		if (err.contains("id")){
			return "ERROR : 이미 존재하는 아이디입니다.";
		} 
		else if (err.contains("mail")){
			return "ERROR : 이미 존재하는 이메일입니다";
		}
		return "ERROR : 해석불가";
	}
	public void onRegSuccess(){
	}
}

자바 코드입니다.ㅠㅠ