JDBC update

package orcale_jdbc;
 
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.Scanner;
 
public class updateTest {
 
    public static void main(String[] args) {
/*        1. class.forname
 *         2. Connection
 *         3. PreparedStatment
 *      4. sql문
 *      5. executeUpdate - insert, update, delete
 *                       - ddl
 *         executeQuery  - Select
 *         
 *        update 테이블명
 *        set     컬럼명 = 바꿀값, 
 *                컬럼명 = 바꿀값
 *        where 조건;
*/    
        Scanner sc = new Scanner(System.in);
        System.out.println("변경할 번호, 새로운 이름과 나이");
        int num = Integer.parseInt(sc.nextLine());
        String name = sc.nextLine();
        int age = Integer.parseInt(sc.nextLine());
        
        Connection conn = null;
        PreparedStatement pstmt = null;
        
        String url = "jdbc:oracle:thin:@localhost:1521:xe";
        String user = "scott";
        String pwd = "tiger";
        
        StringBuilder sql = new StringBuilder();
        sql.append(" update member1                ");
        sql.append(" set name = ? , age = ?     ");
        sql.append(" where no = ?                 ");
 
        try {
            Class c = Class.forName("oracle.jdbc.OracleDriver");
            conn = DriverManager.getConnection(url, user, pwd);
            pstmt = conn.prepareStatement(sql.toString());
            pstmt.setString(1, name);
            pstmt.setInt(2, age);
            pstmt.setInt(3, num);
            
            
            int r=pstmt.executeUpdate();
            if(r>0)
                System.out.println("자료 변경 성공");
            else
                System.out.println("자료 변경 실패");
            
        }catch(Exception e) {
            System.out.println(e);
        }finally {
            if(pstmt!=null) try {pstmt.close();} catch(SQLException e) {}
            if(conn!=null)  try {conn.close();}  catch(SQLException e) {}
        }
        
        
        
    
    }
}