import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.*;

public class Test {

    /**
     * @param args
     */
    public static void main(String[] args) {
        try {
				Class.forName("org.postgresql.Driver");
				Connection con = DriverManager.getConnection("jdbc:postgresql://localhost:5432/postgres?loglevel=2","rushabh","edb");
				PreparedStatement st;
				ResultSet rs;
				st = con.prepareStatement("SELECT ?;--SELECT ?");
				st.setString(1, "a");
				st.execute();        st.getMoreResults();
				st.getMoreResults();
				st.close();  
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}