Get a Map from a JDBC ResultSet

Get a Java Map from a JDBC ResultSet, using a specified column value as the Map key.

Javadoc available at https://www.javatapas.com/docs/javatapas/sql/GetMapFromResultSet.html 


private Map<String, Map<String, String>> getMapFromResultSet(ResultSet rset, String keyCol) throws SQLException {

	Map<String, Map<String, String>> rsMap = new LinkedHashMap<>();

	ResultSetMetaData rsmd = rset.getMetaData();
	//this.logger.log(Level.INFO, "rsmd.getColumnCount(): " + rsmd.getColumnCount());

	int rowIdx = 0;
	while (rset.next()){

		rowIdx++;
		String id = null;

		if (keyCol != null){id = rset.getString(keyCol);}
		else {id = String.valueOf(rowIdx);}

		Map<String, String> valueMap = new LinkedHashMap<>();

		for (int i = 1; i <= rsmd.getColumnCount(); i++) {
			String colName = rsmd.getColumnLabel(i);
			if (valueMap.containsKey(colName)){colName = colName + i;}
			valueMap.put(colName, rset.getString(i));
		}

		rsMap.put(id, valueMap);

	}

	return rsMap;
}