Properties props = new Properties();
String url = "jdbc:postgresql://${host}:${port}/${database}";
Connection conn = DriverManager.getConnection(url, props);
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery(sql);
while (rs.next()) {
// ...
System.out.println(column1 + ", " + column2);
}
rs.close();
stmt.close();
conn.close();
