title: Inserting and Deleting values in with my DBhelper class
body: <p>I found a <code>dbhelper</code> class which copies my previously created database to the <code>DB_PATH = "/data/data/" + context.getPackageName() + "/" + "databases_name/"</code> and by this object I can easily read data from my copied database.  However, I can't figure out how to insert and delete data from this database.</p>
  
  <p>Here is my compelete dbhelper object..</p>
  
  <pre><code>public class DatabaseHelper extends SQLiteOpenHelper {
  
  // The Android's default system path of your application database.
  String DB_PATH = null;
  
  private static String DB_NAME = "ContactInfo";
  
  private SQLiteDatabase myDataBase;
  
  private final Context myContext;
  
  /**
   * Constructor Takes and keeps a reference of the passed context in order to
   * access to the application assets and resources.
   * 
   * @param context
   */
  
  public DatabaseHelper(Context context) {
  
      super(context, DB_NAME, null, 1);
      this.myContext = context;
      DB_PATH = "/data/data/" + context.getPackageName() + "/" + "databases/";
  }
  
  /**
   * Creates a empty database on the system and rewrites it with your own
   * database.
   * */
  public void createDataBase() throws IOException {
  
      boolean dbExist = checkDataBase();
  
      if (dbExist) {
          // do nothing - database already exist
      } else {
  
          // By calling this method and empty database will be created into
          // the default system path
          // of your application so we are gonna be able to overwrite that
          // database with our database.
          this.getReadableDatabase();
  
          try {
  
              copyDataBase();
  
          } catch (IOException e) {
  
              throw new Error("Error copying database");
  
          }
      }
  }
  
  /**
   * Check if the database already exist to avoid re-copying the file each
   * time you open the application.
   * 
   * @return true if it exists, false if it doesn't
   */
  private boolean checkDataBase() {
  
      SQLiteDatabase checkDB = null;
  
      try {
          String myPath = DB_PATH + DB_NAME;
          checkDB = SQLiteDatabase.openDatabase(myPath, null,
                  SQLiteDatabase.OPEN_READONLY);
  
      } catch (SQLiteException e) {
  
          // database does't exist yet.
  
      }
  
      if (checkDB != null) {
  
          checkDB.close();
  
      }
  
      return checkDB != null ? true : false;
  }
  
  /**
   * Copies your database from your local assets-folder to the just created
   * empty database in the system folder, from where it can be accessed and
   * handled. This is done by transfering bytestream.
   * */
  private void copyDataBase() throws IOException {
  
      // Open your local db as the input stream
      InputStream myInput = myContext.getAssets().open(DB_NAME);
  
      // Path to the just created empty db
      String outFileName = DB_PATH + DB_NAME;
  
      // Open the empty db as the output stream
      OutputStream myOutput = new FileOutputStream(outFileName);
  
      // transfer bytes from the inputfile to the outputfile
      byte[] buffer = new byte[1024];
      int length;
      while ((length = myInput.read(buffer)) &gt; 0) {
          myOutput.write(buffer, 0, length);
      }
  
      // Close the streams
      myOutput.flush();
      myOutput.close();
      myInput.close();
  
  }
  
  public void openDataBase() throws SQLException {
  
      // Open the database
      String myPath = DB_PATH + DB_NAME;
      myDataBase = SQLiteDatabase.openDatabase(myPath, null,
              SQLiteDatabase.OPEN_READWRITE);
  
  
  }
  
  @Override
  public synchronized void close() {
  
      if (myDataBase != null)
          myDataBase.close();
  
      super.close();
  
  }
  
  @Override
  public void onCreate(SQLiteDatabase arg0) {
      // TODO Auto-generated method stub
  
  }
  
  @Override
  public void onUpgrade(SQLiteDatabase arg0, int arg1, int arg2) {
      // TODO Auto-generated method stub
  
  }
  
  // return cursor
  public Cursor query(String table, String[] columns, String selection,
          String[] selectionArgs, String groupBy, String having,
          String orderBy) {
      return myDataBase.query(table, columns, selection, selectionArgs,
              groupBy, having, orderBy);
  
  }
  
  public Cursor rawQuery(String query) {
      // TODO Auto-generated method stub
      return myDataBase.rawQuery(query, null);
  }
  
  }
  </code></pre>
  
  <p>I created object of this in my activity class like this:</p>
  
  <pre><code> DatabaseHelper myDbHelper = new DatabaseHelper(MainActivity.this);
  
      try {
          myDbHelper.createDataBase();
      } catch (IOException ioe) {
          throw new Error("Unable to create database");
      }
  
      try {
          myDbHelper.openDataBase();
      } catch (SQLException sqle) {
          throw sqle;
      }
     Toast.makeText(MainActivity.this, "Success", Toast.LENGTH_SHORT).show();
      myDbHelper.close();
  </code></pre>
  
  <p>I can read data by running a query on cursor <code>c=myDbhelper.rawquery(query);</code></p>
  
  <p>What will be the insert and delete ? How can I insert and delete by using this object?</p>