public ResultMap singleSelect(final String sql){
		ResultMap result = new ResultMap();
		Statement stmt;
		try {
			stmt = this.connetion.createStatement();

			ResultSet rs = stmt.executeQuery(sql);
			ResultSetMetaData rsmd = rs.getMetaData();
			int numberOfColumns = rsmd.getColumnCount();
			while (rs.next()) {
				for (int i = 1; i <= numberOfColumns; i++) {
					System.out.println(rs.getString(i));
				}
			}
			stmt.close();
 
		} catch (SQLException ex) {
			log.error("SQLException: " + ex.getMessage());
		}
		return result;
	}