Question

我正在尝试使用PHP更新数据库中的列但是我无法完成它但我无法弄清楚Error.I已经解决了此站点上的先前问题但到目前为止没有解决方案，下面是我的代码我的edititem.php页面代码

<body>
<br><br><br>
<center><font color="#660066" size="+3">Update Item</font></center>
<br><br>
<a href="?con=4"><button>view all items</button></a>
<center><fieldset style="width:50%">
<?php 
    require_once("Dbconfig.php");
    $sel=mysqli_query($conn,"select * from items where Id='{$_GET['itemno']}'") or die(mysqli_error($conn));
    $result_set=mysqli_fetch_array($sel);
    $id=$result_set['id'];
    $category=$result_set['catg'];
    $subcategory=$result_set['subcatg'];
    $amount=$result_set['stock'];
    $itemno=$result_set['itemno'];
    $price=$result_set['price'];
    $description=$result_set['descr'];
    $chair=$result_set['chairm'];
    $table=$result_set['tablem'];
    $material=$result_set['material'];
    $amount=$result_set['amount'];
    $glass=$result_set['glass'];
    $pieces=$result_set['pieces'];
    $seats=$result_set['seats'];
    $stools=$result_set['stools'];
    $guarantee=$result_set['guarantee'];
?>
<?php
    require_once("Dbconfig.php");
    $sel=mysqli_query($conn,"select category from category where cat_id='$category'") or die(mysqli_error($conn));
    $results_set=mysqli_fetch_array($sel);
    $cat=$results_set['category'];
?>
<?php
    require_once("Dbconfig.php");
    $sel=mysqli_query($conn,"select subcategory from subcategory where subcategory='$subcategory'") or die(mysqli_error($conn));
    $result_sets=mysqli_fetch_array($sel);
    $subcat=$result_sets['subcategory'];
?>
<?php
    sleep(1);
?>
<form  name="testform" method="post" action="editItem.php" enctype="multipart/form-data" >
<table align="center">
<tr>
<td><span class="style3">Product Name:</span></td>
<td><input name="product_name" type="text" required="required" placeholder="Product name"></td></tr>
<tr><td width="111"><span class="style3">Category:</span></td>

<td width="264"><select name="cat" onChange="showUser(this.value)">
  <option value="<?php echo $cat; ?>"><?php echo $cat; ?></option>
<?php
    require "Dbconfig.php";// connection to database

    $q=mysqli_query($conn,"select * from category ");
    while($n=mysqli_fetch_array($q)){
    echo "<option value=".$n['cat_id'].">".$n['category']."</option>";
}
?>

</select></td>
</tr>

<tr><td><span class="style3"> Sub Category:</span></td>
<td>
<select name="subcat" id="subcat">
<option value="<?php echo $subcat; ?>"><?php echo $subcat; ?></option>
<?php
    require "Dbconfig.php";// connection to database 
    $q=mysqli_query($conn,"select * from subcategory ");
    while($n=mysqli_fetch_array($q)){
        echo "<option value=".$n['subcategory'].">".$n['subcategory']."</option>";
    }
?>
</select>

</td>
</tr>
<tr>
<td><span class="style3">Amount:</span></td>
<td><input name="amount" type="text" value="<?php echo $amount; ?>"></td></tr>
<tr>
<td><span class="style3">Image:</span></td>
<td><input name="file" type="file"></td></tr>
<tr>
  <td><span class="style3">Item No: </span></td>
  <td><label>
    <input name="t1" type="text" id="t1" value="<?php echo $itemno; ?>">
  </label></td>
</tr>
<tr>
  <td><span class="style3">Price:</span></td>
  <td><label>
  <input name="t2" type="text" id="t2" value="<?php echo $price; ?>">
  </label></td>
</tr>
<tr>
  <td><span class="style3">Table Measurement:</span></td>
  <td><label>
  <input name="t3" type="text" id="t3"   value="<?php echo $table; ?>" >
  </label></td>
</tr>
<tr>
  <td><span class="style3">Chair Measurement:</span></td>
  <td><label>
  <input name="t4" type="text" id="t4"  value="<?php echo $chair; ?>">
  </label></td>
</tr>
<tr>
  <td><span class="style3">Glass Measurement:</span></td>
  <td><label>
  <input name="t15" type="text" id="t15"  value="<?php echo $glass; ?>">
  </label></td>
</tr>
<tr>
  <td><span class="style3">Material:</span></td>
  <td><label>
  <input name="t5" type="text" id="t5"  value="<?php echo $material; ?>">
  </label></td>
</tr>
<tr>
  <td><span class="style3">Seats:</span></td>
  <td><label>
  <input name="t13" type="text" id="t13"  value="<?php echo $seats; ?>">
  </label></td>
</tr>
<tr>
  <td><span class="style3">Stools:</span></td>
  <td><label>
  <input name="t12" type="text" id="t12"  value="<?php echo $stools; ?>">
  </label></td>
</tr>
<tr>
  <td><span class="style3">Pieces Included:</span></td>
  <td><label>
  <input name="t10" type="text" id="t10"  value="<?php echo $pieces; ?>" >
  </label></td>
</tr>
<tr>
  <td><span class="style3">Guarantee:</span></td>
  <td><label>
  <input name="t9" type="text" id="t9"  value="<?php echo $guarantee; ?>">
  </label></td>
</tr>
<tr>
<td><span class="style3">Description:</span></td>
<td><textarea name="text" cols="35" rows="6"><?php echo $description; ?></textarea></td></tr>
<tr><td  colspan="2" align="center">
<input type="hidden" name="id" value="<?php echo $id; ?>" />
<input name="edititem" type="submit" value="Submit"></td></tr>
</table>
</form>
</fieldset></center>
</body>

我的edititem.php代码是

<?php
session_start();
$name=$_SESSION['usr_id'];

include("Dbconfig.php");
if(isset($_POST['submit']))
{
    $productname=$_POST['product_name'];      
    $catg=$_POST['cat'];
    $subcatg=$_POST['subcat'];
    $img=$_FILES['file']['tmp_name'];
    $itemno=$_POST['t1'];
    $price=$_POST['t2'];
    $chair=$_POST['t3'];
    $table=$_POST['t4'];
    $material=$_POST['t5'];
    $descr=$_POST['text'];
    $amount=$_POST['amount'];
    $glass=$_POST['t15'];
    $pieces=$_POST['t10'];
    $seats=$_POST['t13'];
    $stools=$_POST['t12'];
    $guarantee=$_POST['t9'];
    $pid=$_POST['id'];

    include("Dbconfig.php");
    $sql = mysqli_query($conn,"UPDATE `items` SET 
                (`product_name`='$productname',`catg`='$catg',`subcatg`='$subcatg',
                `img`='$image',`price`='$price',`tablem`='$table',
                `chairm`='$chair',`material`='$material',`descr`='$descr',
                `glass`='$glass',`pieces`='$pieces',`seats`='$pieces',
                `stools`='$stools',`guarantee`='$guarantee') 
                WHERE `id` ='$pid'");
    echo "<script>'Window.alert(productUpdated successful)'</script>";
    echo ("<script>location.href='admin.php'</script>");
} else {
       echo "Update Failed!Please Try Again";
}

?>

该页面显示一个空的白色屏幕。帮助我找出我的代码的问题，因为我已经尝试了所有可能的资源，但我找不到解决方案。

Answer 1

<?php
session_start();
$name=$_SESSION['usr_id'];

include("Dbconfig.php");
if(isset($_POST['submit']))
{
    $productname=$_POST['product_name'];      
    $catg=$_POST['cat'];
    $subcatg=$_POST['subcat'];
    $img=$_FILES['file']['tmp_name'];
    $itemno=$_POST['t1'];
    $price=$_POST['t2'];
    $chair=$_POST['t3'];
    $table=$_POST['t4'];
    $material=$_POST['t5'];
    $descr=$_POST['text'];
    $amount=$_POST['amount'];
    $glass=$_POST['t15'];
    $pieces=$_POST['t10'];
    $seats=$_POST['t13'];
    $stools=$_POST['t12'];
    $guarantee=$_POST['t9'];
    $pid=$_POST['id'];

    include("Dbconfig.php");
    $sql = mysqli_query($conn,"UPDATE `items` SET `product_name`='$productname', `catg`='$catg', `subcatg`='$subcatg', `img`='$image', `price`='$price', `tablem`='$table',  `chairm`='$chair', `material`='$material', `descr`='$descr', `glass`='$glass', `pieces`='$pieces', `seats`='$pieces',  `stools`='$stools', `guarantee`='$guarantee' WHERE `id` ='$pid'");
    echo "<script>Window.alert('productUpdated successful')</script>";
    // echo ("<script>location.href='admin.php'</script>");
} else {
       echo "Update Failed!Please Try Again";
}

?>

嗨，我已更新了您的edititem.php文件。

你说的是它的空白页面，这意味着它将处于成功状态但不会移动下一步。

我更新了警戒线。请试试这个。

我评论了重定向，让我们保持评论，让我们看看是否收到提醒。

然后取消注释并查看它是否重定向

Answer 2

如果这些文件已完成，则缺少$ conn初始化。

如果在Dbconfig.php中初始化$ conn，则需要将其指定为全局变量，并在此文件中调用global。 Php可能只是错误输出，如果您的页面为空，请尝试启用错误输出：

ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
error_reporting(E_ALL);

另一个问题可能是没有验证输入，你至少可以使用if（！empty（））语句

旁注，您不会转义/验证变量，并且您的代码容易受到sql注入的攻击。</ p>

数据库列未更新

2 个答案: