PHP ERROR Eine Einfügung verursacht zwei Zeilen ANDROID

Question

Ich habe ein Problem mit meinem Skript PHP Wenn ich auf den Button "Inscrire" klicke, wird meine Anfrage INSERT aufgerufen, aber er erstellt zwei Zeilen in meiner Tabelle mit gleichen Daten.

Hier ist mein Code php:

<?php 
require_once('assistmysql.php'); 

    $id_activite = $_POST['id_activite']; 
    $id_users = $_POST['id_users']; 
    $etat = $_POST['etat']; 

    if($etat == '1') 
    { 
     $sql = "INSERT INTO inscription_activite (id_activite,id_users) VALUES ('$id_activite','$id_users')"; 
     $result=$con->query($sql); 
     if(mysqli_query($con, $sql)) 
      { 
       echo'info enregistrée !!!!'; 
      } 
      else 
      { 
       echo'dommage..'; 

      } 
      mysqli_close($con); 
    } 

    else if ($etat == '2') 
    { 
     $sql = "DELETE FROM inscription_activite WHERE id_users = '$id_users' AND id_activite = '$id_activite'"; 
     $result=$con->query($sql); 
     if(mysqli_query($con, $sql)) 
      { 
       echo'vous etes bien desinscrit !'; 
      } 
      else 
      { 
       echo'quelle tristesse..'; 

      }mysqli_close($con); 
    } 


?> 

Und hier mein Code android:

public class BackgroundWorker extends AsyncTask<String,Void,String> { 

    Context context; 
    AlertDialog alertDialog; 
    BackgroundWorker (Context ctx) { 
     context = ctx; 
    } 
    protected String doInBackground(String... params) { 
     String type = params[0]; 
     String login_url = "http://192.168.20.135/scriptphp/redirectionactivite.php"; 
     if(type.equals("inscrire")) { 
      try { 
       String etat = params [1]; 
       String id_user = params [2]; 
       String id_activite = params[3]; 

       URL url = new URL(login_url); 
       HttpURLConnection httpURLConnection = (HttpURLConnection)url.openConnection(); 
       httpURLConnection.setRequestMethod("POST"); 
       httpURLConnection.setDoOutput(true); 
       httpURLConnection.setDoInput(true); 
       OutputStream outputStream = httpURLConnection.getOutputStream(); 
       BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(outputStream, "UTF-8")); 
       String post_data =URLEncoder.encode("etat", "UTF-8")+"="+URLEncoder.encode(etat,"UTF-8")+"&" 
         +URLEncoder.encode("id_users", "UTF-8")+"="+URLEncoder.encode(id_user,"UTF-8")+"&" 
         +URLEncoder.encode("id_activite", "UTF-8")+"="+URLEncoder.encode(id_activite,"UTF-8"); 

       bufferedWriter.write(post_data); 
       bufferedWriter.flush(); 
       bufferedWriter.close(); 
       outputStream.close(); 
       InputStream inputStream = httpURLConnection.getInputStream(); 
       BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream,"iso-8859-1")); 
       String result=""; 
       String line=""; 
       while((line = bufferedReader.readLine())!= null) { 
        result += line; 
       } 
       bufferedReader.close(); 
       inputStream.close(); 
       httpURLConnection.disconnect(); 
       return result; 
      } catch (MalformedURLException e) { 
       e.printStackTrace(); 
      } catch (IOException e) { 
       e.printStackTrace(); 
      } 
     } 
     else if (type.equals("desinscrire")) 
     { 
      try { 
       String etat = params [1]; 
       String id_user = params [2]; 
       String id_activite = params[3]; 

       URL url = new URL(login_url); 
       HttpURLConnection httpURLConnection = (HttpURLConnection)url.openConnection(); 
       httpURLConnection.setRequestMethod("POST"); 
       httpURLConnection.setDoOutput(true); 
       httpURLConnection.setDoInput(true); 
       OutputStream outputStream = httpURLConnection.getOutputStream(); 
       BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(outputStream, "UTF-8")); 
       String post_data =URLEncoder.encode("etat", "UTF-8")+"="+URLEncoder.encode(etat,"UTF-8")+"&" 
         +URLEncoder.encode("id_users", "UTF-8")+"="+URLEncoder.encode(id_user,"UTF-8")+"&" 
         +URLEncoder.encode("id_activite", "UTF-8")+"="+URLEncoder.encode(id_activite,"UTF-8"); 

       bufferedWriter.write(post_data); 
       bufferedWriter.flush(); 
       bufferedWriter.close(); 
       outputStream.close(); 
       InputStream inputStream = httpURLConnection.getInputStream(); 
       BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream,"iso-8859-1")); 
       String result=""; 
       String line=""; 
       while((line = bufferedReader.readLine())!= null) { 
        result += line; 
       } 
       bufferedReader.close(); 
       inputStream.close(); 
       httpURLConnection.disconnect(); 
       return result; 
      } catch (MalformedURLException e) { 
       e.printStackTrace(); 
      } catch (IOException e) { 
       e.printStackTrace(); 
      } 


     } 
     return null; 
    } 

    protected void onPreExecute() { 
     alertDialog = new AlertDialog.Builder(context).create(); 
     alertDialog.setTitle("Info status"); 
    } 

    protected void onPostExecute(String result) { 
     alertDialog.setMessage(result); 
     alertDialog.show(); 
    } 

    protected void onProgressUpdate(Void... values) { 
     super.onProgressUpdate(values); 
    } 
} 

Answer 1

in Ihrem PHP-Code, scheinen Sie die Abfrage zweimal spielen werden:

$result=$con->query($sql); 
if(mysqli_query($con, $sql)) 

Entweder:

$result = $con->query($sql); 
if ($result) { 

oder:

if(mysqli_query($con, $sql)) {