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我想用PHP來更新使用HTML表單的SQL表。PHP變量保持重置
我希望用戶能夠搜索錄像機名稱並在while循環中顯示它的詳細信息,然後會出現一個更新表單,供用戶在數據庫中更改其詳細信息。
但是每當我按下更新表單上的更新按鈕時,保留新細節的變量就會變空並變得未定義。
<?php require('connect.php'); ?>
<?php require('headerPrivate.php'); ?>
<?php require('session.php');?>
<?php
//SEARCH PHP CODE
//THIS WORKS FINE AND ALL THE DETAILS APPEAR
if(isset($_POST["search"]))
{
//CREATE VARIABLES
$username=$_SESSION['username'];
echo "username: ".$username;
echo '<br>';
$vcrName=$_POST['name'];
echo "VCR Name: ".$vcrName;
echo '<br>';
echo '<br>';
//SELECT * FROM PRODUCT
$sql="SELECT *
FROM product
INNER JOIN user
ON product.owner_ID=user.user_ID
WHERE username='$username' AND name='$vcrName'";
echo "SQL SELECT 1: ".$sql;
echo '<br>';
echo '<br>';
//$vcrName=$_POST['name'];
$result = mysqli_query($con,$sql);
echo '<div class="row">';
echo '<div class="col-xs-6 col-md-4">';
while ($row_all = mysqli_fetch_assoc($result))
{
echo '<form method="post">';
echo "<u>Title: ".$row_all["name"].'</u>';
echo '<br>';
echo '<small>';
echo " Price: ".$row_all["price"];
echo '</small>';
echo '<br>';
echo "<p><u>Short Description:</u> ".$row_all["short_descripton"]."</p>";
echo '<br>';
echo "<p><u>Long Description:</u> ".$row_all["long_description"]."</p>";
echo '<br>';
echo '<hr>';
echo '</form>';
echo '<div>';
}
echo '</div>';
}
?>
<content>
<!--SEARCH FOR VCR NAME-->
<form class="form" method="post">
<label for="name" class="sr-only">VCR Name</label>
<input type="text" name="name" class="form-control" placeholder="VCR Name" required="" autofocus="" autocomplete="off">
<button name="search" type="search" class="btn btn-success btn-block">Search</button>
</form>
<?php
//This is where i run into issues. The old name in the variable $vcrName is empty and i need it for the update SQL statement.
//UPDATE PHP
if(isset($_POST["alter"]))
{
//CREATE A SESSION VARIABLE FOR THE CUSTOMER ID
$customer_ID=$_SESSION['customer_ID'];
echo "Customer ID: ".$customer_ID;
echo '<br>';
//CREATE VARIABLES
$changeTitle=$_POST["titleChange"];
$changesDescChange=$_POST["sDescChange"];
$changelDescChange=$_POST["lDescChange"];
$changepriceChange=$_POST["priceChange"];
$vcrName=$_POST['name'];
//UPDATE SQL
$sql_update="UPDATE product
SET
name='$changeTitle',
short_descripton='$changesDescChange',
long_description='$changelDescChange',
price='$changepriceChange'
WHERE
owner_ID='$customer_ID' AND name='$vcrName'";
echo "SQL Update 0: ".$sql_update;
echo '<br>';
echo '<br>';
echo "Updated Name: ".$changeTitle;
echo '<br>';
echo '<br>';
echo "SQL Update 1: ".$sql_update;
return $sql_update;
echo '<br>';
echo '<br>';
$result_update = mysqli_query($con,$sql_update);
if($result_update){
echo "Update Successful!";
}
else {
echo "Update Unsuccessful";
}
}
?>
<!--UPDATE FORM-->
<form class="form" method="post">
<label for="titleChange" class="sr-only">VCR Name</label>
<input type="text" name="titleChange" class="form-control" placeholder="VCR Name" required="" autofocus="" autocomplete="off">
<label for="sDescChange" class="sr-only">Short Description</label>
<input type="text" name="sDescChange" class="form-control" placeholder="Short Description" required="" autofocus="" autocomplete="off">
<label for="lDescChange" class="sr-only">Long Description</label>
<input type="text" name="lDescChange" class="form-control" placeholder="Long Description" required="" autofocus="" autocomplete="off">
<label for="priceChange" class="sr-only">Price</label>
<input type="text" name="priceChange" class="form-control" placeholder="Price" required="" autofocus="" autocomplete="off">
<button name="alter" type="submit">Change</button>
</form>
</content>
</body>
</html>
這就是Web編程的工作原理:來自瀏覽器的每個請求都是一個全新的請求,並且只包含瀏覽器發送的信息。使用隱藏的表單元素,cookie或會話(有效地,由cookie標識的文件,以便您可以找到返回的同一用戶)。 – IMSoP
您的HTML「表單」中沒有任何「」元素。你不會在'$ _POST'中得到任何東西。 – miken32
@ miken32咦?我在這兩個例子中都看到了很多''元素。一個在第一個,第四個在第二個。 – IMSoP