gistfile1.txt

        //find PK column
        List<String> pkColList = new ArrayList<String>();
        DatabaseMetaData dbMetaData = con.getMetaData();
        ResultSet pkRs = dbMetaData.getPrimaryKeys(null, schema, table);
        while(pkRs.next()) {
            pkColList.add(pkRs.getString(4));
        }
        pkRs.close();
        if (pkColList.size() != 1) {
            throw new InvalidTableException("Table " + schema + "." + table + " has " + pkColList.size() + " PK columns - only allowed 1");
        }