我的问题是更新SQL记录。它正确地将SQL数据提取到表单中(用于编辑)但是当我按下保存编辑按钮时,它会在输入字段内返回以下错误:
注意:未定义的变量:行在 C:\ xampp \ htdocs \ edit.php 上 46 请告诉我如何修复它
<html>
<body>
<?php
$servername = "localhost";
$username = "root";
$password = "zz224466";
$database = "zain";
$conn = mysqli_connect($servername,$username,$password,$database);
if($conn->connect_error) {
die("connection failed: " . $conn->connect_error);
}
if(isset($_GET['edit'])) {
$id = $_GET["edit"]; //Get id of sql table from other php page.
echo $id; //It gives true result. It means that $_GET method above gets id of sql table correctly
$res = mysqli_query($conn, "SELECT * FROM product where product_id=$id");
if ($res == FALSE) {
die("Error");
}
$row = mysqli_fetch_array($res);// Getting row from sql of specific id above selected above
if (isset($_POST['Edit'])) { ///Checking if Edit button has been pressed
$product_category = $_POST['product_category'];
$product_id = $id;
//// SQL query
$sql_category = "UPDATE product SET product_category='$product_category' WHERE product_id=$id";
if (mysqli_query($conn, $sql_category)) {
}
}
}
?>
////////////////////HTML FORM/////////////////////////
<form method="post" action ="edit.php" id="contact-form">
<input type="text" name="product_category" placeholder="product_category" value="<?php echo $row['product_category'];//It prints sql record in input field which is to be updated and it prints correctly. But when I press edit button it gives above mentioned error ?>"/>
<div class="btn-group" role="group">
<input type="submit" class="btn btn-default" name="Edit" value="Save Edits" style="margin-top: 15px; margin-right: 15px; border-radius: 4px;">
</div>
</form>
</body>
</html>
请告诉我如何解决它
答案 0 :(得分:1)
试试这个。因为,当你按下提交按钮。它会带有POST
值且没有GET
参数的 edit.php (在按下Edit
提交按钮后。因此,浏览器无法找到{{1}导致它,没有$id
值。)
$row
例如<input type="text" name="product_category" placeholder="product_category" value="<?php if(isset($row['product_category'])) { echo $row['product_category'];}?>"/>
按https:www.example.com/edit.php?edit=1
按钮后,submit
更改为
URL
所以,没有https:www.example.com/edit.php
更新代码
将edit=1
更改为
<form>
除了之前我做过的事情。
完整更新的代码(请参阅我编写的行<form method="post" action ="edit.php?edit=<?echo $_GET['edit'];?>" id="contact-form">
)
Change Here