Write a Menu driven program in java for Insert Record into Table,Update the existing Record and Display all records from the table

Write a Menu driven program in java for the following:

1. Insert Record into Table

2. Update the existing Record

3. Display all records from the table 

Program:

import java.sql.*;
import java.io.*;

public class MenuRec {
    public statuc void main(String args[])throws SQLException, ClassNotFoundException, IOException {
        int ch,rollNo,marks,k;
        String name;
        String sql;

        Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
        COnnection con = DriverManager.getConnection("jdbc:odbc:MyDSN");

        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        Statement stmt;
        do {
            System.out.println("Menu:");
            System.out.println("1. Insert \n 2.Update \n 3.Display:");
            System.out.println("Enter Choice:");
            ch = Integer.parseInt(br.readLine());
            switch(ch) {
                case 1:
                    stmt = con.createStatement();
                    System.out.println("Enter Roll No:");
                    rollNo = Integer.parseInt(br.readLine());

                    System.out.println("Enter Name:");
                    name = br.readLine();

                    System.out.println("Enter Marks:");
                    marks = Integer.parseInt(br.readLine());

                    sql = "insert into Result values ("+rollNo+",'"+name+"',"+marks+")";
                    k = stmt.executeUpdate(sql);
                    if(k>0) {
                        System.out.println("Record Inserted.");
                    }
                    stmt.close();
                    break;
                case 2:
                    stmt = con.createStatement();

                    System.out.println("Enter Roll No:");
                    rollNo = Integer.parseInt(br.readLine());

                    System.out.println("Enter Name:");
                    name = br.readLine();

                    System.out.println("Enter Marks:");
                    marks = Integer.parseInt(br.readLine());

                    sql = "update Result set name='"+name+"',marks="+marks+" where roll="+rollNo;
                    k = stmt.executeUpdate(sql);

                    if(k>0) {
                        System.out.println("Record Updated.");
                    }
                    stmt.close();
                    break;
                case 3:
                    stmt = con.createStatement();

                    sql = "select roll,name, marks from Result";
                    ResultSet res = stmt.executeQuery(sql);

                    while(res.next()){
                        System.out.println(res.getInt(1)+"\t"+res.getString(2)+"\t"+res.getInt(3));
                    }

                    break;
                default: System.out.println("Invalid Choice.");
            }
        } while(ch<=3);
    }
}