Android : android user login using php and oracle database 10g

I'm developping an android application and I'm having trouble with my user login using php and oracle databse 10g ! I can't find any examples working with oracle !! This is my php code :

include("connexion.php");

if (!empty($_POST)) {

if (empty($_POST['code_client']) || empty($_POST['password_client'])) { 

 $response["success"] = 0; 
 $response["message"] = "One or both of the fields are empty ."; 


die(json_encode($response)); } 

$query = " SELECT * FROM client_mb WHERE code_client = '$code_client'and password_client='$password_client'"; 

$result = oci_parse($connect, $query);

oci_execute($result); 

$row = oci_fetch_array($result);

if (!empty($row)) { 

$response["success"] = 1;

 $response["message"] = "You have been sucessfully login";

die(json_encode($response)); } 

 else{ 

 $response["success"] = 0; 

 $response["message"] = "invalid username or password "; 

 die(json_encode($response)); 
 } 

 } else{ 

 $response["success"] = 0;

 $response["message"] = " One or both of the fields are empty "; 


die(json_encode($response)); 

 } 
  include("deconnexion.php");

This is my java code :

private static final String TAG_SUCCESS = "success";

private static final String TAG_MESSAGE = "message";

public static final String TAG_CODE = "code_client";

public static final String TAG_PWD = "password_client";


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_login);

    txtcode = (EditText) findViewById(R.id.login);
    txtpass = (EditText) findViewById(R.id.mdp);

    bLogin = (Button) findViewById(R.id.btnLogin);
    bLogin.setOnClickListener(new OnClickListener() {


        @Override
        public void onClick(View v) {


            cde = txtcode.getText().toString();
            password = txtpass.getText().toString();

            if ((TextUtils.isEmpty(cde)) || (TextUtils.isEmpty(password))) {
                Toast.makeText(LoginActivity.this,
                        "Veuillez remplir tous les champs",
                        Toast.LENGTH_LONG).show();
            }

            else {

                new AttemptLogin().execute(LOGIN_URL);




            }

        }

    });

}

class AttemptLogin extends AsyncTask<String, String, String> {


 @Override
    protected void onPreExecute() {

        super.onPreExecute();
        pDialog = new ProgressDialog(LoginActivity.this);
        pDialog.setMessage("Loading...");
        pDialog.setIndeterminate(false);
        pDialog.setCancelable(true);
        pDialog.show();
    }

    @SuppressWarnings("deprecation")
    @Override
    protected String doInBackground(String... args) {

        // TODO Auto-generated method stub // here Check for success tag
        int success;

        try {

            List<NameValuePair> params = new ArrayList<NameValuePair>();
            params.add(new BasicNameValuePair(TAG_CODE, cde));
            params.add(new BasicNameValuePair(TAG_PWD, password));
            Log.d("request!", "starting");

            JSONObject json = jsonParser.makeHttpRequest(LOGIN_URL, "GET",
                    params);


            Log.d("Login attempt", json.toString());
            success = json.getInt(TAG_SUCCESS);
            if (success == 1) {

                Log.d("Successfully Login!", json.toString());
                Intent i = new Intent(LoginActivity.this,
                        MenuEspaceClientActivity.class);

                finish();

                startActivity(i);
                return json.getString(TAG_MESSAGE);
            } else {
                return json.getString(TAG_MESSAGE);
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }
        return null;
    }


    protected void onPostExecute(String message) {
        pDialog.dismiss();

        if (message != null) {
            Toast.makeText(LoginActivity.this, message, Toast.LENGTH_LONG)
                    .show();
        }


    }
}

PS: I'm working with JSONParser class . Is there something wrong with my code ? I can't figure out what's wrong ! Any help pleeeeaaaase ? Is there a working example that I can maybe use ?