title: execute a select statement in Android
body: <p>i want to create a new method and catch all values of fehlzeiten sum the values and return them as a int. <code>db.execSQL</code> says it executes a single sql statement that returns no data. fehlzeiten is a String but it includes only numbers</p>
  
  <pre><code>public class NotesDbAdapter {
  
  public static final String KEY_TITLE = "title";
  public static final String KEY_BODY = "body";
  public static final String KEY_ROWID = "_id";
  public static final String KEY_Test = "test";
  public static final String KEY_Time = "fehlzeiten";
  private static final String TAG = "NotesDbAdapter";
  private DatabaseHelper mDbHelper;
  private SQLiteDatabase mDb;
  
  /**
   * Database creation sql statement
   */
  
  private static final String DATABASE_CREATE =
      "create table notes (_id integer primary key autoincrement, "
      + "title text not null, body text not null, fehlzeiten text not null, test text not null);";
  
  private static final String DATABASE_NAME = "data";
  private static final String DATABASE_TABLE = "notes";
  private static final int DATABASE_VERSION = 4;
  
  private final Context mCtx;
  
  private static class DatabaseHelper extends SQLiteOpenHelper {
  
      DatabaseHelper(Context context) {
          super(context, DATABASE_NAME, null, DATABASE_VERSION);
      }
  
      @Override
  
      public void onCreate(SQLiteDatabase db) {
          db.execSQL(DATABASE_CREATE);
  
      }
  
      @Override
      public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
          Log.w(TAG, "Upgrading database from version " + oldVersion + " to "
                  + newVersion + ", which will destroy all old data");
          db.execSQL("DROP TABLE IF EXISTS notes");
          onCreate(db);
      }
  }
  
  /**
   * Constructor - takes the context to allow the database to be
   * opened/created
   * 
   * @param ctx the Context within which to work
   */
  public NotesDbAdapter(Context ctx) {
      this.mCtx = ctx;
  }
  
  /**
   * Open the notes database. If it cannot be opened, try to create a new
   * instance of the database. If it cannot be created, throw an exception to
   * signal the failure
   * 
   * @return this (self reference, allowing this to be chained in an
   *         initialization call)
   * @throws SQLException if the database could be neither opened or created
   */
  public NotesDbAdapter open() throws SQLException {
      mDbHelper = new DatabaseHelper(mCtx);
      mDb = mDbHelper.getWritableDatabase();
      return this;
  }
  
  public void close() {
      mDbHelper.close();
  }
  
  
  /**
   * Create a new note using the title and body provided. If the note is
   * successfully created return the new rowId for that note, otherwise return
   * a -1 to indicate failure.
   * 
   * @param title the title of the note
   * @param body the body of the note
   * @return rowId or -1 if failed
   */
  public long createNote(String title, String body, String fehlzeit, String test) {
      ContentValues initialValues = new ContentValues();
      initialValues.put(KEY_TITLE, title);
      initialValues.put(KEY_BODY, body);
      initialValues.put(KEY_Time, fehlzeit);
      initialValues.put(KEY_Test, test);
  
      return mDb.insert(DATABASE_TABLE, null, initialValues);
  }
  
  /**
   * Delete the note with the given rowId
   * 
   * @param rowId id of note to delete
   * @return true if deleted, false otherwise
   */
  public boolean deleteNote(long rowId) {
  
      return mDb.delete(DATABASE_TABLE, KEY_ROWID + "=" + rowId, null) &gt; 0;
  }
  
  /**
   * Return a Cursor over the list of all notes in the database
   * 
   * @return Cursor over all notes
   */
  public Cursor fetchAllNotes() {
  
      return mDb.query(DATABASE_TABLE, new String[] {KEY_ROWID, KEY_TITLE,
              KEY_BODY,KEY_Time,KEY_Test}, null, null, null, null, null);
  }
  
  
  
  
  /**
   * Return a Cursor positioned at the note that matches the given rowId
   * 
   * @param rowId id of note to retrieve
   * @return Cursor positioned to matching note, if found
   * @throws SQLException if note could not be found/retrieved
   */
  public Cursor fetchNote(long rowId) throws SQLException {
  
      Cursor mCursor =
  
          mDb.query(true, DATABASE_TABLE, new String[] {KEY_ROWID,
                  KEY_TITLE, KEY_BODY,KEY_Time,KEY_Test}, KEY_ROWID + "=" + rowId, null,
                  null, null, null, null);
      if (mCursor != null) {
          mCursor.moveToFirst();
      }
      return mCursor;
  
  }
  
  
  /**
   * Update the note using the details provided. The note to be updated is
   * specified using the rowId, and it is altered to use the title and body
   * values passed in
   * 
   * @param rowId id of note to update
   * @param title value to set note title to
   * @param body value to set note body to
   * @return true if the note was successfully updated, false otherwise
   */
  public boolean updateNote(long rowId, String title, String body, String fehlzeiten, String test) {
      ContentValues args = new ContentValues();
      args.put(KEY_TITLE, title);
      args.put(KEY_BODY, body);
      args.put(KEY_Time, fehlzeiten);
      args.put(KEY_Test, test);
  
      return mDb.update(DATABASE_TABLE, args, KEY_ROWID + "=" + rowId, null) &gt; 0;
  }
  
  private int ausgabe() 
  {
      //i want to return the sum of all entrys in fehlzeit here
  
  
  
  }
  
  }
  </code></pre>
  
  <p>maybe it's not the best to use sql but i don't know how i can make it otherwise</p>