String myDriver = "com.mysql.jdbc.Driver";
            String myUrl = "jdbc:mysql://localhost:3306/rsds_data";
            Class.forName(myDriver);
            Connection conn = DriverManager.getConnection(myUrl, "root", "");
            String query = "SELECT * FROM slowa_kluczowe";
            Statement st = conn.createStatement();
            ResultSet rs = st.executeQuery(query);

            List<Row> rows = new ArrayList<>();
            rs.next();
            Row row = RowFactory.create(JdbcRDD.resultSetToObjectArray(rs));
            rows.add(row);

            Dataset<Row> df = sparkSession.createDataFrame(rows, jdbcDF.schema());
            df.printSchema();
            df.show();