jsp中修改mysql数据库

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %>
<%@ page import="java.sql.*" %>

<%
    // 设置数据库连接信息
    String url = "jdbc:mysql://localhost:3306/mydatabase";
    String username = "root";
    String password = "password";
    
    // 建立数据库连接
    Connection conn = null;
    try {
        Class.forName("com.mysql.jdbc.Driver");
        conn = DriverManager.getConnection(url, username, password);
        
        // 编写SQL语句
        String sql = "UPDATE mytable SET column1 = ?, column2 = ? WHERE id = ?";
        
        // 创建PreparedStatement对象
        PreparedStatement pstmt = conn.prepareStatement(sql);
        
        // 设置SQL语句中的参数
        pstmt.setString(1, "new value1");
        pstmt.setString(2, "new value2");
        pstmt.setInt(3, 1); // 根据具体需求设置要修改的数据的条件
        
        // 执行SQL语句
        int rowsAffected = pstmt.executeUpdate();
        
        // 输出修改的行数
        out.println("Rows affected: " + rowsAffected);
        
        // 关闭PreparedStatement对象
        pstmt.close();
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        // 关闭数据库连接
        if (conn != null) {
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
%>