我一直收到这个错误：警告：mysqli_query（）期望参数1为mysqli，null为C：\ wamp64 \ www。\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ [英] I keep getting this error: warning: mysqli_query() expects parameter 1 to be mysqli, null given in C:\wamp64\www\fish R us website\details.php on line 12
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问题描述
我一直在研究这个问题，我无法弄清楚如何让它发挥作用！我一直得到同样的错误。作为参考，我正在尝试生成动态链接，所以当我点击列表页面上的按钮时，它会在第二页上生成内容。
如果你想要请参阅列表页面代码，让我知道。这是动态页面：
我尝试过：
I have been working on this for a while and I just can't figure out how to make it work! I keep getting the same error. For reference, I am trying to generate a dynamic link so when I click on a button from my list page it generates content on a second page.
If you want to see the list page code, let me know. Here is the dynamic page:
What I have tried:
<?php
if(isset($_GET['id'])) {
require_once 'login1.php';
$id=null;
$dbc = null;
$conn = new mysqli($hn, $un, $pw, $db); //these three lines connect to the db with the login file
if($conn->connect_error) die($conn->connect_error); //all the lines above here will be in all your codes
$sql = "SELECT * FROM freshwater WHERE id='$id' ";
$result = mysqli_query($dbc, $sql) or die("Bad Query: $sql");
$row = mysqli_fetch_array($result);
}
?>
<html>
<head>
<title>Fish R Us - Saltwater Fish</title>
</head>
<body>
<div class="toptext"><center>
<img src="banner.png" height="300"></img></center>
</div>
<center>
<h2><?php echo $row['name'] ?></h2>
width="150" height="150"
<img src="<?php echo $row['picture'] ?>" width="150" height="150"></img>
<table>
<tr>
<th>Name</th>
<th>Type</th>
<th>Quantity</th>
<th>Price</th>
</tr>
<tr>
<td><?php echo $row['name'] ?></td>
<td><?php echo $row['type'] ?></td>
<td><?php echo $row['qty'] ?></td>
<td><?php echo $row['price'] ?></td>
</tr>
</table><br>
<table class="fish-text">
<th><?php echo $row['description'] ?></th>
</center></table><br>
<button padding: 10px 24px;><a href="products.php">Return to Products List</a></button></body>
<button padding: 10px 24px;><a href="menu.php">Return to Menu</a></button>
</html>
推荐答案
_GET ['id']））{
require_once'login1。 php';
_GET['id'])) { require_once 'login1.php';
id = null;
id=null;
dbc = null;
dbc = null;
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