<?php
if(isset($_POST["submit"])){

if(!empty($_POST['email']) && !empty($_POST['clave'])) {
    $email=$_POST['email'];
    $clave=$_POST['clave'];

    $con=mysql_connect('localhost','root','') or die(mysql_error());
    mysql_select_db('usuario') or die("cannot select DB");

    $query=mysql_query("SELECT * FROM login WHERE email='".$email."' AND clave='".$clave."'");
    $numrows=mysql_num_rows($query);
    if($numrows!=0)
    {
    while($row=mysql_fetch_assoc($query))
    {
    $dbusername=$row['email'];
    $dbpassword=$row['clave'];
    }

    if($email == $dbusername && $clave == $dbpassword)
    {
    session_start();
    $_SESSION['sess_user']=$email;

    /* Redirect browser */
    header("Location: Inicio.php");
    }
    } else {
    echo "Nombre de usuario invalido o clave incorrecta";
    }

} else {
    echo "Todos los campos son requeridos";
}
}

CREATE TABLE IF NOT EXISTS `my_chart_data` (
  `category` date NOT NULL,
  `value1` int(11) NOT NULL,
  `value2` int(11) NOT NULL
);

if($email == $dbusername && $clave == $dbpassword)
        {
        session_start();
        $_SESSION['sess_user']=$email;
  mysql_query("UPDATE my_chart_data SET value1 = +1 WHERE  category");

        /* Redirect browser */
        header("Location: Inicio.php");
        }
        } else {
        echo "Nombre de usuario invalido o clave incorrecta";
 mysql_query("UPDATE my_chart_data SET value2 = +1 WHERE  category");
        }

    } else {
        echo "Todos los campos son requeridos";
    }
    }