Edit Form PHP PDO | 易学教程

问题

I have a table in SQL Server database. I created an "edit.php" where we can update the database. The database connection is established using PDO.

I have a lot of Null values in the table. When I click "Edit" option, the form pops out. If I completely fill the records, the database gets updated. Otherwise I get this error message.

SQLSTATE[42000]: [Microsoft][ODBC Driver 11 for SQL Server][SQL Server]Error converting data type nvarchar to numeric.

The codes for my edit.php are included below:

require_once('database.php');
if (isset($_POST['btn_submit'])) {
        $id = $_POST['txt_id'];
        $site = $_POST['txt_site_code'];
        $location = $_POST['txt_location_name'];

 try {
       $stmt = $conn->prepare("UPDATE MATRIX SET Site_Code=:site, Location_name=:location
WHERE OBJECTID =:id");
$stmt->execute(array(':site' => $site, ':location' => $location,':id' => $id));
if ($stmt) {


                   header('Location:index.php');

               }
             } catch (PDOException $e) {
               echo $e->getMessage();
            }
}

    $object_id = '';
    $site = '';
    $location = '';

 if (isset($_GET['id'])) {
        $id = $_GET['id'];
        $stmt = $conn->prepare("SELECT * FROM MATRIX WHERE OBJECTID=:id");
        $stmt->execute(array(':id' => $id));
        $row = $stmt->fetch();
        $object_id = $row['OBJECTID'];
        $site = $row['Site_Code'];
        $location = $row['Location_name'];
}

?>
    <h2>Edit the records</h2>

    <form action="" method="post">
        <table border="3px" cellpadding="5px">

            <tr>
                <td>Site Code</td>
                <td><input type="text" name="txt_site_code"  value="<?= $site; ?>"></td>
            </tr>

            <tr>
                <td>Location Name</td>
                <td><input type="text" name="txt_location_name" value="<?= $location; ?>"></td>
            </tr>

             <tr>
                <td><input type="hidden" name="txt_id" value="<?= $object_id; ?>"></td>
                <td><input type="submit" name="btn_submit" value="Submit"></td>
            </tr>

</table>
</form>

I would appreciate your efforts to help.

回答1:

You have to prevent null datas, received by php.

Example :

$site = '';
if(isset($_POST['site'])) {
    $site = $_POST['site'];
}

Do it for each value you want to protect before update your database.

回答2:

Insert string value (example '0') if there is no data submitted instead of numeric value. The error because of insert numeric value to a string type column.

来源：https://stackoverflow.com/questions/39275460/edit-form-php-pdo

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