0
我需要触发器的帮助。我有两个表'产品'和'存储'。这个想法是当我在表'storage'的列'flag'上运行更新时，触发器必须为正确的ID计算库存，但总是返回所有产品的错误值，请参阅附加。正确的股票价值应该是'测试'10件和'aaaaaa'5件。感谢帮助。Mysql触发器返回坏股价值
产品表：
CREATE TABLE `products` (
`id` int(11) NOT NULL,
`subcategory_id` int(11) NOT NULL,
`product_name` varchar(255) COLLATE utf8_bin NOT NULL,
`product_description` varchar(255) COLLATE utf8_bin NOT NULL,
`product_price` int(11) NOT NULL,
`product_type` varchar(1) COLLATE utf8_bin NOT NULL,
`product_quantity` int(11) NOT NULL
) ENGINE=InnoDB;
INSERT INTO `products` (`id`, `subcategory_id`, `product_name`, `product_description`, `product_price`, `product_type`, `product_quantity`) VALUES
(45, 11, 'Test', 'test', 1111, 'G', 15),
(46, 11, 'aaaaaa', 'aaaaaa', 12, 'G', 15);
存储表：
CREATE TABLE `storage` (
`id` int(11) NOT NULL,
`product_id` int(11) NOT NULL,
`flag` varchar(1) COLLATE utf8_bin NOT NULL DEFAULT 'A'
) ENGINE=InnoDB;
INSERT INTO `storage` (`id`, `product_id`, `flag`) VALUES
(46, 45, 'A'),
(47, 45, 'A'),
(48, 45, 'A'),
(49, 45, 'A'),
(50, 45, 'A'),
(51, 45, 'A'),
(52, 45, 'A'),
(53, 45, 'A'),
(54, 45, 'A'),
(55, 45, 'A'),
(56, 46, 'A'),
(57, 46, 'A'),
(58, 46, 'A'),
(59, 46, 'A'),
(60, 46, 'A');
mysql的触发器：
DELIMITER $$
CREATE TRIGGER `tg_ai_table22` AFTER UPDATE ON `storage` FOR EACH ROW UPDATE products
SET products.product_quantity = (SELECT COUNT(product_quantity)
FROM STORAGE, (SELECT id FROM products) as prod
WHERE prod.id = storage.product_id AND storage.flag = 'A' LIMIT 1)
$$
DELIMITER ;
PHP函数： 车控制器：
public function addToCart()
{
$id = $this->uri->segment(3);
$data = $this->ProductModel->selectProductToCart($id);
$cartData = array();
foreach ($data as $datas) {
$cartData = array(
'id' => $datas->id,
'qty' => 1,
'price' => $datas->product_price,
'name' => $datas->product_name
);
}
$this->cart->insert($cartData) ? $this->db->limit(1)->set('flag', 'C')->where('product_id', $cartData['id'])->where('flag', 'A')->update('storage') : '';
}
public function updateCart()
{
$updatedCartData = $this->input->post();
for ($i = 1; $i <= sizeof($this->cart->contents()); $i++)
{
if ($this->cart->contents()[$updatedCartData[$i]['rowid']]['rowid'] == $updatedCartData[$i]['rowid'])
{
if ($this->cart->contents()[$updatedCartData[$i]['rowid']]['qty'] > $updatedCartData[$i]['qty'])
{
$result = $this->cart->contents()[$updatedCartData[$i]['rowid']]['qty'] - $updatedCartData[$i]['qty'];
for ($j = 1; $j <= $result; $j++)
{
$this->db->limit(1)->set('flag', 'A')->where('product_id',
$this->cart->contents()[$updatedCartData[$i]['rowid']]['id'])->where('flag',
'C')->update('storage');
}
} else
{
$result = $updatedCartData[$i]['qty'] - $this->cart->contents()[$updatedCartData[$i]['rowid']]['qty'];
for ($j = 1; $j <= $result; $j++)
{
$this->db->limit(1)->set('flag', 'C')->where('product_id',
$this->cart->contents()[$updatedCartData[$i]['rowid']]['id'])->where('flag',
'A')->update('storage');
}
}
}
}
$this->cart->update($updatedCartData);
$this->session->set_flashdata('category_success', 'Kosik bol aktualizovany.');
redirect('Cart');
}
ProductController的：
<?php defined('BASEPATH') OR exit('No direct script access allowed');
class Product extends MY_Controller
{
public function __construct()
{
parent::__construct();
$this->load->model('ProductModel');
}
public function index($id)
{
$data['product'] = $this->ProductModel->selectProduct($id);
$this->load->view('HeaderView');
$this->load->view('UpperMenuView');
$this->load->view('LeftMenuView');
$this->load->view('ProductView', $data);
$this->load->view('FooterView');
}
}
产品型号：
<?php defined('BASEPATH') OR exit('No direct script access allowed');
class ProductModel extends CI_Model
{
private $table = 'products';
public function __construct()
{
parent::__construct();
}
function selectProduct($id)
{
return $this->db->get_where($this->table, array('subcategory_id' => $id))->result();
}
function selectProductToCart($id)
{
return $this->db->get_where($this->table, array('id' => $id))->result();
}
public function insertProduct($data)
{
$this->db->insert($this->table, $data);
}
public function insertProductToStorage($data)
{
$this->db->insert('storage', $data);
}
}
的ProductView：
<div class="col-md-9">
<?php $this->load->view('FlashMessagesView'); ?>
<ul class="list-unstyled" id="products" data-role="list">
<?php foreach ($product as $value): ?>
<li class="span3 col-md-3">
<div class="thumbnail">
<a href="product_details.html"><img src="<?php echo base_url('assets/img/12.jpg'); ?>"/></a>
<div class="caption" style="height: 300px; overflow: hidden">
<h5><?php echo $value->product_name; ?></h5>
<p><?php echo $value->product_description; ?></p>
</div>
<div class="product_footer caption">
<?php if ($value->product_quantity == 0) { ?>
<p style="text-align: center"><span style="color:orange"><b>Ordered on request.</b></span></p>
<?php } else { ?>
<p style="text-align: center">
<span style="color:green">
<b>In stock <?php echo $value->product_quantity ?> pcs.</b>
</span>
</p>
<?php } ?>
<h4>
<a type="button" href="<?php echo base_url('Cart') ?>" id="<?php echo $value->id ?>"
class="btn btn-success">Buy</a>
<span class="pull-right"><?php echo $value->product_price; ?> €</span>
</h4>
</div>
</div>
</li>
<?php endforeach; ?>
</ul>
</div>
你的php代码在哪里？ –
你好，现在我编辑了一个文章 – matus177
在执行“插入”查询之前，运行antother查询来检查库存，例如执行查询后，从存储where product ='product_id'“的选择count（*），你可以简单地运行$ number_of_stock = $ query_res-> fetchColumn（）;并与此你有股票的数量 –