jsp插入mysql没成功

<%@ page import="java.sql.*" %>
<%
    String url = "jdbc:mysql://localhost:3306/mydatabase";
    String username = "myuser";
    String password = "mypassword";
    
    try {
        Class.forName("com.mysql.jdbc.Driver");
        Connection conn = DriverManager.getConnection(url, username, password);
        
        String sql = "INSERT INTO mytable (column1, column2) VALUES (?, ?)";
        PreparedStatement pstmt = conn.prepareStatement(sql);
        pstmt.setString(1, "value1");
        pstmt.setString(2, "value2");
        
        int rowsInserted = pstmt.executeUpdate();
        if (rowsInserted > 0) {
            out.println("A new row was inserted successfully!");
        }
        
        pstmt.close();
        conn.close();
    } catch (ClassNotFoundException | SQLException e) {
        out.println("Error: " + e.getMessage());
    }
%>