import java.io.IOException;
    import java.io.PrintWriter;
    import java.sql.Connection;
    import java.sql.DriverManager;
    import java.sql.ResultSet;
    import java.sql.Statement;
    import java.util.Scanner;

    public class DbCheck {
        public static void main(String[] args) {
            Scanner scan = new Scanner(System.in);
            try {
                Class.forName("org.postgresql.Driver");
                Connection con=DriverManager.getConnection("jdbc:postgresql://localhost:5432/postgres","postgres","selva");
                Statement st=con.createStatement();
                System.out.println("Name: ");
                String name = scan.nextLine();
                String sql= "select * from memberdata where name='" + name +"'";
                ResultSet rs = st.executeQuery(sql);
                if(rs.next()) {
                    System.out.println("Success");
                }
                else {
                    System.out.println("Failure");
                }
                scan.close();
                con.close();
            }catch(Exception e){
                System.out.println("Error: "+e.getMessage());
            }
        }
    }