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我的PDO查詢不起作用。這是我的頁面：PDO插入查詢不起作用
<!DOCTYPE html>
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<head>
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="description" content="Rally is our passion">
<meta name="author" content="Robin Rosiers">
<title>Sponsors - RPR Admin</title>
<?php require_once ('include/core.php'); ?>
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<a class="navbar-brand" href="index.php" alt="Rallypodium & Reporting" title="Rallypodium & Reporting">RPR - Administration Panel</a>
</div>
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<div class="collapse navbar-collapse navbar-ex1-collapse">
<ul class="nav navbar-nav side-nav">
<li><a href="home.php"><i class="fa fa-home"></i> Home</a></li>
<li><a href="news.php"><i class="fa fa-list-alt"></i> Nieuws</a></li>
<li><a href="fotos.php"><i class="fa fa-camera"></i> Foto's</a></li>
<li><a href="pages.php"><i class="fa fa-edit"></i> Pagina's</a></li>
<li><a href="editpages.php"><i class="fa fa-font"></i> Bewerk pagina's</a></li>
<li><a href="meldingen.php"><i class="fa fa-desktop"></i> Melding(en)</a></li>
<li class="active"><a href="sponsors.php"><i class="fa fa-money"></i> Sponsors</a></li>
<li><a href="settings.php"><i class="fa fa-wrench"></i> Instellingen</a></li>
<li><a href="accsettings.php"><i class="fa fa-pencil"></i> Account instellingen</a></li>
<li><a href="addadmin.php"><i class="fa fa-check"></i> Administrator toevoegen</a></li>
</ul>
<ul class="nav navbar-nav navbar-right navbar-user">
<li class="dropdown user-dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown"><i class="fa fa-user"></i> {Gebruikersnaam} <b class="caret"></b></a>
<ul class="dropdown-menu">
<li><a href="accsettings.php"><i class="fa fa-gear"></i> Instellingen</a></li>
<li class="divider"></li>
<li><a href="#"><i class="fa fa-power-off"></i> Log uit</a></li>
</ul>
</li>
</li>
</ul>
</div><!-- /.navbar-collapse -->
</nav>
<div id="page-wrapper">
<div class="row">
<div class="col-lg-12">
<h1>Sponsors<small><br></small></h1>
<ol class="breadcrumb">
<li class="active"><i class="fa fa-money"></i> Sponsors</li>
</ol>
</div>
</div><!-- /.row -->
<div class="row">
<div class="col-lg-12">
<div class="panel panel-primary">
<div class="panel-heading">
<h3 class="panel-title"><i class="fa fa-plus"></i> Sponsor toevoegen</h3>
</div>
<div class="panel-body" style="max-height:600px; overflow:auto">
<!-- Content/script hier om een sponsor te adden. -->
<?php
if($_SERVER['REQUEST_METHOD']=="POST") {
$naam = $db->quote($_POST['naam']);
$site = $db->quote($_POST['site']);
$img = $db->quote($_POST['img']);
$opbrengst = $db->quote($_POST['opbrengst']);
$duur = $db->quote($_POST['duur']);
$sql = " INSERT INTO sponsors (naam, site, img, opbrengst, duur) VALUES ('".$naam.", ".$site.", ".$img.", ".$opbrengst.", ".$duur."')";
}
?>
<center>
<form action="?ok" method="post">
Sponsor naam: <input name="naam" class="form-control" type="text" placeholder="Naam..." style="width:auto;"><br>
Site (url) <input name="site" class="form-control" type="text" placeholder="http://" style="width:auto;"><br>
Sponsor image (url) <input name="img" class="form-control" type="text" placeholder="vb http://i.imgur.com/" style="width:auto;"><br>
Opbrengst: € <input name="opbrengst" class="form-control" type="text" placeholder="opbrengst" style="width:auto;"> /maand<br>
<div class="form-group">
<label>Duur:</label>
<select name="duur" class="form-control" style="width:auto;">
<option>1 maand</option>
<option>2 maanden</option>
<option>3 maanden</option>
<option>4 maanden</option>
<option>5 maanden</option>
<option>6 maanden</option>
<option>7 maanden</option>
<option>8 maanden</option>
<option>9 maanden</option>
<option>10 maanden</option>
<option>11 maanden</option>
<option>1 jaar</option>
</select>
</div>
<button type="submit" class="btn">Opslaan</button>
</form>
</center>
</div>
</div>
</div>
</div><!-- /.row -->
<div class="row">
<div class="col-lg-12">
<div class="panel panel-primary">
<div class="panel-heading">
<h3 class="panel-title"><i class="fa fa-list"></i> Sponsor lijst</h3>
</div>
<div class="panel-body">
<?php
$sql = "SELECT * FROM sponsors ORDER BY id";
$results = $db->query($sql);
foreach($results as $row)
{
echo '<div class="alert alert-info">';
echo '<button type="button" class="close" data-dismiss="alert" aria-hidden="true" alt="verwijder de sponsor." title="verwijder de sponsor.">×</button>';
echo '<p>Naam: ';
echo $row['naam'];
echo ' <i class="fa fa-tag"></i> </p>';
echo '<p>Opbrengst: ';
echo $row['opbrengst'];
echo ' <i class="fa fa-money"></i> </p>';
echo '</div>';
}
?>
</div>
</div>
</div>
</div>
</div><!-- /.row -->
</div><!-- /#page-wrapper -->
</div><!-- /#wrapper -->
<!-- JavaScript -->
<script src="js/jquery-1.10.2.js"></script>
<script src="js/bootstrap.js"></script>
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<script src="js/morris/chart-data-morris.js"></script>
<script src="js/tablesorter/jquery.tablesorter.js"></script>
<script src="js/tablesorter/tables.js"></script>
</body>
</html>
它非常有線。選擇代碼工作正常，但插入查詢不。它出什麼問題了？
調試此簡單地用'回聲$ SQL;'你會發現，你只是之前第一個和最後一個變量後的'值具有單引號（）'列表。 –
如果您開始學習在PDO中使用預準備語句，這很容易避免。 [我推薦本教程]（http://wiki.hashphp.org/PDO_Tutorial_for_MySQL_Developers） –