open_in_new content_copy 
<%@ page import="java.sql.*" %>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Username Check</title>
</head>
<body>
<%
    String username = request.getParameter("name");

    String jdbcUrl = "jdbc:mysql://localhost:3306/nehal";
    String dbUser = "root";
    String dbPassword = "nehal@123";

    Connection conn = null;
    PreparedStatement pstmt = null;
    ResultSet rs = null;

    try {
        Class.forName("com.mysql.cj.jdbc.Driver");
        conn = DriverManager.getConnection(jdbcUrl, dbUser, dbPassword);

        String sql = "SELECT * FROM emp WHERE name = ?";
        pstmt = conn.prepareStatement(sql);
        pstmt.setString(1, username);

        rs = pstmt.executeQuery();

        if (rs.next()) {
            out.println("<h2>Success: Username '" + username + "' exists in the database.</h2>");
        } else {
            out.println("<h2>Failure: Username '" + username + "' does not exist.</h2>");
        }

    } catch (Exception e) {
        out.println("<h2>Error: " + e.getMessage() + "</h2>");
      
    } finally {
        try {
            if (rs != null) rs.close();
            if (pstmt != null) pstmt.close();
            if (conn != null) conn.close();
        } catch (SQLException e) {
           
        }
    }
%>
</body>
</html>
--html
<!DOCTYPE html>
<html>
<head>
    <title>Update User</title>
</head>
<body>
    <h2>Update User Information</h2>
    <form action="updateUser.jsp" method="post">
        <label for="id">User ID:</label>
        <input type="text" id="id" name="id" required><br><br>

        <label for="name">New Name:</label>
        <input type="text" id="name" name="name" required><br><br>

        <input type="submit" value="Update">
    </form>
</body>
</html>