php我的CRUD更新有问题

Question

I tried disabling strict mode, changing precio to int, tried to convert it to double but so far nothing works. Can anyone recommend me a good book or a good youtube channel on web development?. The CRUD works so far as insert and deleting goes. But update doesn't work. When I disabled strict mode I stopped getting the warning #1265 but it didn't update anything. I'm using WAMP, phpmyadmin and Notepad++. I've also changed the $_GET to POST on my update an it didnt work

<?php
   include("conexion.php");
   $registros=$base->query("select * from articulo")- 
   >fetchAll(PDO::FETCH_OBJ);

if(isset($_POST['cr']))
{
    $nombre=$_POST["Nom"];
    $cantidad=$_POST["Can"];
    $precio=$_POST["Pre"];
    $costo=$_POST["Cos"];
    $sql="INSERT INTO articulo (nombre,cantidad,precio,costo) VALUES(:nom, :can, :pre, :cos)";
    $resultado=$base->prepare($sql);
    $resultado->execute(array(":nom"=>$nombre,":can"=>$cantidad,":pre"=>$precio,":cos"=>$costo ));
    header("Location:index.php");
}
?>

<h1>CRUD<span class="subtitulo">Create Read Update Delete</span></h1>
<form action="<?php echo $_SERVER['PHP_SELF'];?>" method="post"> 
<table width="50%" border="0" align="center">
<tr >
  <td class="primera_fila">Id</td>
  <td class="primera_fila">Nombre</td>
  <td class="primera_fila">Cantidad</td>
  <td class="primera_fila">Precio</td>
  <td class="primera_fila">Costo</td>
  <td class="sin">&nbsp;</td>
  <td class="sin">&nbsp;</td>
  <td class="sin">&nbsp;</td>
  <td class="sin">&nbsp;</td>
</tr> 

<?php
    foreach($registros as $articulo):?> 
<tr>
  <td> <?php echo $articulo->Id_campo?> </td>
  <td> <?php echo $articulo->nombre?> </td>
  <td> <?php echo $articulo->cantidad?></td>
  <td> <?php echo $articulo->precio?> </td> 
  <td> <?php echo $articulo->costo?> </td> 
  <td class="bot"><a href="borrar.php?Id=<?php echo $articulo->Id_campo?>"><input type='button' name='del' id='del' value='Borrar'></a></td>      
  <td class='bot'><a href="editar.php?Id=<?php echo $articulo->Id_campo?> & nom=<?php echo $articulo->nombre?> & can=<?php echo $articulo->cantidad?> & pre=<?php echo $articulo->precio?> & cos=<?php echo $articulo->costo?>"><input type='button' name='up' id='up' value='Actualizar'></a></td>

</tr>       
<?php
    endforeach;
?>

And this is the code for the update php

  <h1>ACTUALIZAR</h1>
<?php

include("conexion.php");
if (!isset($_POST["bot_actualizar"]))
{
    $Id=$_GET["Id"];
    $nom=$_GET["nom"];
    $can=$_GET["can"];
    $pre=$_GET["pre"];
    $cos=$_GET["cos"];  
}
else
{
    $Id=$_GET["Id"];
    $nom=$_GET["nom"];
    $can=$_GET["can"];
    $pre=$_GET["pre"];
    $cos=$_GET["cos"];
    $sql="UPDATE articulo SET nombre=:miNom, cantidad=:miCan, precio=:miPre, 
    costo=:miCos WHERE Id_campo=:miId";
    $resultado=$base->prepare($sql);
    $resultado->execute(array(":miId"=>$Id, ":miNom"=>$nom, ":miCan"=>$can, 
    ":miPre"=>$pre, ":miCos"=>$cos));
    header("Location:index.php");
}
?>

<p>

</p>
<p>&nbsp;</p>
<form name="form1" method="post" action="<?php $_SERVER['PHP_SELF'];?>">
 <table width="25%" border="0" align="center">
   <tr>
     <td></td>
     <td><label for="id"></label>
  <input type="hidden" name="id" id="id" value="<?php echo $Id?>"></td>
 </tr>
 <tr>
  <td>Nombre</td>
  <td><label for="nom"></label>
  <input type="text" name="nom" id="nom" value="<?php echo $nom?>"></td>
 </tr>
 <tr>
  <td>Cantidad</td>
  <td><label for="can"></label>
  <input type="text" name="can" id="can" value="<?php echo $can?>"></td> 
 </tr>
 <tr>
  <td>Precio</td>
  <td><label for="pre"></label>
  <input type="text" name="pre" id="pre" value="<?php echo $pre?>"></td>
 </tr>
 <tr>
  <td>Costo</td>
  <td><label for="cos"></label>
  <input type="text" name="cos" id="cos" value="<?php echo $cos?>"></td>
  </tr>
  <tr>
    <td colspan="2"><input type="submit" name="bot_actualizar" 
   id="bot_actualizar" value="Actualizar"></td>
    </tr>
   </table>
  </form>
 <p>&nbsp;</p>

Answer 1

2 things.

1. Your form is using POST method and for your update you are looking for GET request.

2. The header sent at the end of the update is useless as you already start diplaying the page with the H1....

       include("conexion.php");
       if (!isset($_POST["bot_actualizar"]))
       {
           $Id=$_POST["Id"];
           $nom=$_POST["nom"];
           $can=$_POST["can"];
           $pre=$_POST["pre"];
           $cos=$_POST["cos"];  
       }
       else
       {
           $Id=$_POST["Id"];
           $nom=$_POST["nom"];
           $can=$_POST["can"];
           $pre=$_POST["pre"];
           $cos=$_POST["cos"];
           $sql="UPDATE articulo SET nombre=:miNom, cantidad=:miCan, precio=:miPre, 
           costo=:miCos WHERE Id_campo=:miId";
           $resultado=$base->prepare($sql);
           $resultado->execute(array(":miId"=>$Id, ":miNom"=>$nom, ":miCan"=>$can, 
           ":miPre"=>$pre, ":miCos"=>$cos));
       }