Maak verbinding met een externe MySQL-database via Android

Kant van de Android-app:

private ArrayList<String> receiveData(String file, ArrayList<NameValuePair> data)
{
    InputStream is = null;
    ArrayList<String> output = new ArrayList<String>();
    String line = null;

    //Connect and obtain data via HTTP.
    try
    {
        HttpClient httpclient = new DefaultHttpClient();
        HttpPost httppost = new HttpPost("http://www.blah.com/"+file);
        httppost.setEntity(new UrlEncodedFormEntity(data));
        HttpResponse response = httpclient.execute(httppost);
        HttpEntity entity = response.getEntity();
        is = entity.getContent();

    }
    catch(Exception e)
    {
        Log.e("log_tag", "Error in http connection "+e.toString());
    }

    //Parse data into ArrayList and return.
    try
    {
        BufferedReader reader = 
            new BufferedReader(new InputStreamReader(is,"iso-8859-1"));

        while ((line = reader.readLine()) != null) 
        {
            //Parse data into tokens and removing unimportant tokens.
            StringTokenizer st = new StringTokenizer(line, delims, false);

            while(st.hasMoreTokens())
            {
                String token = st.nextToken();
                output.add(token);
            }
        }

        is.close();
        //Log output of data in LogCat.
        Log.d("DATA","DATA:"+output);

    }
    catch(Exception e)
    {
        Log.e("log_tag", "Error converting result "+e.toString());
    }
    return output;
}

/**
 * Gets all  data from GetAllData.php
 * @return output - ArrayList containing  data.
 */
public ArrayList<String> getAllData(String row)
{
    fileName = "GetAllData.php";

    //Add arguments to arrayList<NameValuePairs> so we can encode the data and send it on.
    ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(1);
    nameValuePairs.add(new BasicNameValuePair("row", row));

    ArrayList<String> output = this.receiveData(fileName, nameValuePairs);
    return output;
}

Serverkant:

dus dan is het GetAllData.php-bestand op de server:

<?php
/*
 * What this file does is it:
 * 1) Creates connection to database.
 * 2) Gets data from database.
 * 3) Encodes data to JSON. So this data can then be used by Android Application.
 * 4) Close database connection.
 */
 require_once $_SERVER['DOCUMENT_ROOT'].'/Clarity/Connection.php';
 require_once $_SERVER['DOCUMENT_ROOT'].'/Clarity/ReceiveAPI.php';

 $server = new Connection();
 $receive = new ReceiveAPI();

 //Retrieve information.
 $row = $_POST['row'];

//Connect to database.
$server->connectDB();
$output = $receive->getAllData($row); //basically method to query database.
print(json_encode($output)); //output is result of the query given back to app.

//Disconnect from database.
$server->disconnectDB();
?>

Dit is een voorbeeld dat ik onlangs heb gebruikt. Gewoon om op te merken in het php-bestand. Ik importeer Connection.phpthis gaat alleen over de verbinding met de database. Dus vervang dat gewoon door uw code om verbinding te maken met MYSQL db. Ook heb ik SendAPI.php geïmporteerd (die je gewoon kunt negeren) Dit was gewoon mijn klas voor het verzenden van gegevens. In feite bevatte het enkele van de zoekopdrachten die ik wilde gebruiken. Zoals sendAccelerationData(). In principe was de klasse vergelijkbaar met die van opgeslagen procedures.

Hoe ik verbinding maakte met de database was in mijn Connection.php-klasse.

//Connect to a database.
public function connectDB()
{
    //Connect to SQL server.
    $this->connection = mysql_connect($this->hostName,$this->user,$this->password);

    if (!$this->connection) 
    {
        die('Could not connect: ' . mysql_error());
    }
    //Print("Connected to MySQL. </br>");

    //Select Database to query.
    $db_selected = mysql_select_db($this->database);
    if (!$db_selected) 
    {
        die('Could not select database' . mysql_error());
    }
    //Print("Database \"$this->database\" selected. </br>");
}

//Disconnect from database.
public function disconnectDB() 
{
    mysql_close($this->connection);
}
}

Opmerking in foutmeldingen dat ik schema uit db heb uitgeprint, zoals db-naam / tabelnaam. Dit was gewoon het oplossen van problemen. Ik raad dit af. U wilt die informatie NIET aan de gebruiker tonen.