private boolean insertBlock(ArrayList<AndroidDevice> devices) {
		String sql = null;
		try {

			Statement statement  = dbhelper.createConnection();
			checkTable(statement, DBSettings.TABLE_NAME);
			sql = DbStatementBuilder.buildAddDevicesCommand(devices, DBSettings.COLUMN_NAMES);
			log(sql);
			return (dbhelper.executeInsert(statement, sql) > 0);

		} catch (IOException e) {
			e.printStackTrace();
			log(sql);
			return false;
		}

	}