PHP MySQL 成功消息总是显示

Question

我遇到了成功消息或失败消息的问题。我的代码在下面，但问题是无论如何，成功消息总是显示 - 甚至在查询发生之前。如果我删除成功消息 if 命令，那么它不会执行它应该执行的操作。

 isset($_POST['delete']);
 $systemid = $_POST['systemid'];
 $clientiddel = $_POST['clientiddel'];
 $querydel = "DELETE FROM ... WHERE customer = '" . $clientiddel . " ' AND system_id = '" . $systemid . "'";

  if(mysql_query($querydel))
{
    echo 'SUCCESS';
}
else
{
    echo 'FAILED' .mysql_error();
}

我的表格是

<form method='post' action='" . $_PHP_SELF . "'>
<input name='systemid' type='hidden' id='systemid' value='" . $row['system_id'] . "'><input name='clientiddel' type='hidden' id='clientiddel' value='" . $row['customer'] . "'><input name='delete' type='image' src='images/delete.gif' id='delete' alt='Delete' onclick='return confirm_delete()'>
</form>

点击函数是

<script type='text/javascript'>
function confirm_delete() {
  return confirm('Are you sure you want to delete \'".$row['system_id']."\' from this account? ');
}
</script>

编辑:

问题已解决 - 向名为“delete”的表单添加一个额外的隐藏字段使其按应有的方式工作。此外，这是此操作的最终来源:

    if(isset($_POST['delete'])){
        $systemid = $_POST['systemid'];
        $clientiddel = $_POST['clientiddel'];
        $querydel = "DELETE FROM .... WHERE system_customer = '".$clientiddel." ' AND system_id = '".$systemid."'";

        if(mysql_query($querydel))
        {
            echo 'SUCCESS';
        }
        else
        {
            echo 'FAILED' .mysql_error();
        }

}

Answer 1

让我们从表单开始。 $_PHP_SELF 不存在。您想要使用的是 $_SERVER['PHP_SELF']。您最好不要尝试处理该变量并将操作留空:

<form method="post" action="">

您的 PHP 将始终运行....您需要执行以下操作:

if(isset($_POST['delete'])) {
    // run the PHP here.
}

注意事项

mysql_* 库已弃用并设置为将来删除。请考虑使用更可靠的库，例如 PDO 或 MySQLi。这一点都不难。这是一个简单的 PDO 示例，可以实现您的尝试。

/* Connect to an ODBC database using driver invocation */
$dsn = 'mysql:dbname=testdb;host=127.0.0.1';
$user = 'dbuser';
$password = 'dbpass';

try {
    $dbh = new PDO($dsn, $user, $password);
} catch (PDOException $e) {
    echo 'Connection failed: ' . $e->getMessage();
}

$sql = "DELETE FROM table WHERE customer = :client_id AND system_id = :system_id";
$stmt = $pdo->prepare($sql);
$stmt->bindParam(':client_id', $_POST['clientiddel'], PDO::PARAM_INT);
$stmt->bindParam(':system_id', $_POST['systemid'], PDO::PARAM_INT);
$stmt->execute();

^{Read More about PHP PDO here}

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您需要为 delete 按钮的 onClick 属性中的 confirm_delete() 提供代码。