我正在尝试将更新功能添加到我的CRUD应用程序中。本质上它使用指定的数据库，并使用index.php页面中的“id”，即数据库中的“productID”。在应用程序的另一部分中，商店管理功能包含在相同的框架更新页面中，并且工作正常。
数据库（产品）包含productID（PK），productName，productPrice，storeID（FK），productDate，productComments，productQuantity和productPortion。
我确定它在PHP脚本中，可能在使用一些错误检查后围绕UPDATE命令，但我似乎无法弄清楚可能是主要问题。
HTML
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<link href="css/bootstrap.min.css" rel="stylesheet">
<script src="js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
<div class="span10 offset1">
<div class="row">
<h3>Update an Item</h3>
</div>
<form class="form-horizontal" action="update.php" method="post">
<input type="hidden" name="productID" value="<?php echo $id ?>">
<div class="control-group <?php echo !empty($nameError)?'error':'';?>">
<label class="control-label">Item</label>
<div class="controls">
<input name="productName" type="text" placeholder="Product Name" value="<?php echo !empty($productName)?$productName:'';?>">
<?php if (!empty($nameError)): ?>
<span class="help-inline"><?php echo $nameError;?></span>
<?php endif;?>
</div>
</div>
<div class="control-group <?php echo !empty($priceError)?'error':'';?>">
<label class="control-label">Price</label>
<div class="controls">
<input name="productPrice" type="number" step="any" placeholder="Price" value="<?php echo !empty($productPrice)?$productPrice:'';?>">
<?php if (!empty($priceError)): ?>
<span class="help-inline"><?php echo $priceError;?></span>
<?php endif;?>
</div>
</div>
<div class="control-group <?php echo !empty($storeError)?'error':'';?>">
<label class="control-label">Store</label>
<div class="controls">
<select name="storeID" class="form-control">
<option value="">Select Store</option>
<?php $pdo=D atabase::connect(); $sql='SELECT * FROM Store ORDER BY storeName DESC' ; foreach ($pdo->query($sql) as $row) { $selected = $row['storeID']==$storeID?'selected':''; echo '
<option value="'. $row['storeID'] .'" '. $selected .'>'. $row['storeName'] .'</option>'; } Database::disconnect(); ?>
</select>
<?php if (!empty($storeError)): ?>
<span class="help-inline"><?php echo $storeError;?></span>
<?php endif; ?>
</div>
</div>
<div class="control-group <?php echo !empty($dateError)?'error':'';?>">
<label class="control-label">Date</label>
<div class="controls">
<input name="productDate" type="date" step="any" placeholder="Date" value="<?php echo !empty($productDate)?$productDate:'';?>">
<?php if (!empty($dateError)): ?>
<span class="help-inline"><?php echo $dateError;?></span>
<?php endif;?>
</div>
</div>
<div class="control-group <?php echo !empty($commentsError)?'error':'';?>">
<label class="control-label">Comments</label>
<div class="controls">
<input name="productComments" type="text" placeholder="Comments" value="<?php echo !empty($productComments)?$productComments:'';?>">
<?php if (!empty($commentsError)): ?>
<span class="help-inline"><?php echo $commentsError;?></span>
<?php endif;?>
</div>
</div>
<div class="control-group <?php echo !empty($quantityError)?'error':'';?>">
<label class="control-label">Quantity</label>
<div class="controls">
<input name="productQuantity" type="number" placeholder="Quantity" value="<?php echo !empty($productQuantity)?$productQuantity:'';?>">
<?php if (!empty($quantityError)): ?>
<span class="help-inline"><?php echo $quantityError;?></span>
<?php endif;?>
</div>
</div>
<div class="control-group <?php echo !empty($portionError)?'error':'';?>">
<label class="control-label">Portion</label>
<div class="controls">
<input name="productPortion" type="number" placeholder="Portion" value="<?php echo !empty($productPortion)?$productPortion:'';?>">
<?php if (!empty($portionError)): ?>
<span class="help-inline"><?php echo $portionError;?></span>
<?php endif;?>
</div>
</div>
<div class="form-actions">
<button type="submit" class="btn btn-success">Update</button>
<a class="btn" href="index.php">Back</a>
</div>
</form>
</div>
</div>
<!-- /container -->
</body>
</html>
PHP
<?php
require 'database.php';
$id = null;
if ( !empty($_GET['id'])) {
$id = $_REQUEST['id'];
}
if ( null==$id ) {
header("Location: index.php");
}
if ( !empty($_POST)) {
// keep track validation errors
$nameError = null;
$priceError = null;
$storeError = null;
$dateError = null;
$quantityError = null;
$portionError = null;
// keep track post values
$id = $_POST['id'];
$storeID= $_POST['storeID'];
$productName = $_POST['productName'];
$productPrice = $_POST['productPrice'];
$productQuantity = $_POST['productQuantity'];
$productPortion = $_POST['productPortion'];
$productComments = $_POST['productComments'];
$productDate = $_POST['productDate'];
//error displayed for creation errors
$valid = true;
if (empty($productName)) {
$nameError = 'Please enter the name of the product';
$valid = false;
}
if (empty($productPrice)) {
$priceError = 'Please enter a price';
$valid = false;
}
if (empty($storeID)) {
$storeError = 'Please enter a store';
$valid = false;
}
if (empty($productDate)) {
$dateError = 'Please enter the purchase date';
$valid = false;
}
if (empty($productComments)) {
$commentsError = 'Please enter any comments';
$valid = false;
}
if (empty($productQuantity)) {
$quantityError = 'Please select the quantity';
$valid = false;
}
if (empty($productPortion)) {
$portionError = 'Please enter the portion';
$valid = false;
}
// insert data
if ($valid) {
$pdo = Database::connect();
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$sql = "UPDATE Product SET productName=?, productPrice=?, storeID=?, productDate=?,
productComments=?, productQuantity=?, productPortion=? WHERE productID=?";
$q = $pdo->prepare($sql);
$q->execute(array($productName,$productPrice,$storeID,$productDate,
$productComments,$productQuantity,$productPortion,$id));
Database::disconnect();
header("Location: index.php");
}
} else {
$pdo = Database::connect();
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$sql = "SELECT * FROM Product WHERE productID = ?";
$q = $pdo->prepare($sql);
$q->execute(array($id));
$data = $q->fetch(PDO::FETCH_ASSOC);
$productName = $data['productName'];
$productPrice = $data['productPrice'];
$storeID = $data['storeID'];
$productQuantity = $data['productQuantity'];
$productPortion = $data['productPortion'];
$productComments = $data['productComments'];
$productDate = $data['productDate'];
Database::disconnect();
}
?>
答案 0 :(得分：1)
快速查看代码，您将通过$ _POST发送表单数据，并在PHP脚本上检查$ _GET，然后从$ _REQUEST中获取ID。尝试更改
if ( !empty($_GET['id'])) {
$id = $_REQUEST['id'];
}
到
if ( !empty($_POST['id'])) {
$id = $_POST['id'];
}
希望有所帮助！
答案 1 :(得分：0)
谢谢Donniep！
我发现答案实际上与提交后的POST值有关。我的印象是我仍然可以使用来自＆＃39; id＆＃39;的GET调用的值，但我需要使用产品数据库中的实际ID值。解决方案原来是：
// keep track post values
$id = $_POST['id'];
需要改为：
// keep track post values
$id = $_POST['productID'];