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<%@ page language="java" import="java.sql.*" %>
<html>
    <body>
        <%
            String resultado = "";
            Class.forName("com.mysql.jdbc.Driver");
            Connection conn = DriverManager.getConnection("jdbc:mysql://localhost/bddX", "root", "");
            Statement stmt = conn.createStatement();
            String sql = "SELECT columna FROM tablaX WHERE id = X";
            ResultSet rs = stmt.executeQuery(sql);
            while (rs.next()) {
            resultado += rs.getObject("columna").toString();
            }
            out.println(resultado);
        %>
    </body>
</html>