我是CakePHP 2.4的新手，我希望有人可以帮助我解决我遇到的问题。
我的项目中存在内存耗尽的问题 - 我已经调试了它并且使用2 GB内存完成了所有工作 - 但我的虚拟主机公司只允许1 GB。
所以我想知道是什么让MySQL耗费了这么多内存 - 当我在订单中添加优惠券时会发生这种情况 - 优惠券包含我店里的所有产品。
我在导致问题的行之前调试了调试和一长串数组（大约1200张A4页面） - 我发现了很多，我猜这就是为什么蛋糕中的mysql.php会出现以下错误：
Fatal error: Allowed memory size of 188743680 bytes exhausted
(tried to allocate 32 bytes) in lib/Cake/Model/Datasource/Database/Mysql.php on line 277
有没有办法解决这个问题 - 所以要么呼叫较小，要么内存增加。
编辑：我认为不是优惠券控制器/模型使问题成为订单模型导致它获取所有产品 - 已经提出以下代码：
希望有人会看一下它给我一个如何让它发挥作用的暗示。 我已经尝试调试内存使用量，它只使用大约3 MB - 但是当添加优惠券时，它只是充斥内存并永远运行。
订购模式
<?php
App::uses('AppModel', 'Model');
class Order extends AppModel
{
public $displayField = 'id';
private $shipping_price = 39;
private $free_shipping_threshold = 500;
private $tax_rate = 0.20;
public $validate = array(
'state' => array(
'rule' => array('inList', array('unplaced', 'received', 'packed', 'resolved')),
'allowEmpty' => false,
'message' => 'Du skal vælge et stadie.'
),
'shipping_price' => array(
'decimal' => array(
'rule' => 'decimal',
'allowEmpty' => false,
'message' => 'Du skal angive en pris.',
),
'notNegative' => array(
'rule' => array('comparison', '>=', 0),
'message' => 'En pris kan ikke være negativ.'
)
),
);
public $hasMany = array(
'OrderItem'
);
public $belongsTo = array(
'Customer',
'Coupon'
);
private function purgeInactives($order_id)
{
// Find the order
$order = $this->find('first', array('conditions' => array('Order.id' => $order_id), 'recursive' => 2));
// Run through all order items in the order
foreach ($order['OrderItem'] as $key => $order_item) {
// Check if the order was a yarn batch
if ($order_item['yarn_batch_id'] != 0) {
// Check if the item is active
if (!$order_item['YarnBatch']['is_active']) {
$this->OrderItem->delete($order_item['id']);
SessionComponent::setFlash(' Der blev fjernet en varer fra din indkøbskurv da det er ikke længere er aktivt. '.SessionComponent::read('Message.warning.message'), null, array(), 'warning');
} // Check if there are any of this item left in stock
else if ($order_item['YarnBatch']['stock_quantity'] < 1) {
$this->OrderItem->delete($order_item['id']);
SessionComponent::setFlash(' En af varene i din indkøbskurv er ikke længere på lager. '.SessionComponent::read('Message.warning.message'), null, array(), 'warning');
}
} // Check if the order was a needle variant
else if ($order_item['needle_variant_id'] != 0) {
// Check if the item is active
if (!$order_item['NeedleVariant']['is_active']) {
$this->OrderItem->delete($order_item['id']);
SessionComponent::setFlash(' Der blev fjernet en varer fra din indkøbskurv da det er ikke længere er aktivt. '.SessionComponent::read('Message.warning.message'), null, array(), 'warning');
} // Check if there are any of this item left in stock
else if ($order_item['NeedleVariant']['stock_quantity'] < 1) {
$this->OrderItem->delete($order_item['id']);
SessionComponent::setFlash(' En af varene i din indkøbskurv er ikke længere på lager. '.SessionComponent::read('Message.warning.message'), null, array(), 'warning');
}
} // Check if the order was a recipe
else if ($order_item['recipe_id'] != 0) {
// Check if the item is active
if (!$order_item['Recipe']['is_active']) {
$this->OrderItem->delete($order_item['id']);
SessionComponent::setFlash(' Der blev fjernet en varer fra din indkøbskurv da det er ikke længere er aktivt. '.SessionComponent::read('Message.warning.message'), null, array(), 'warning');
}
} else if ($order_item['color_sample_id'] != 0) {
// Check if the item is active
if (!$order_item['ColorSample']['is_active']) {
$this->OrderItem->delete($order_item['id']);
SessionComponent::setFlash(' Der blev fjernet en varer fra din indkøbskurv da det er ikke længere er aktivt. '.SessionComponent::read('Message.warning.message'), null, array(), 'warning');
}
} else {
$this->OrderItem->delete($order_item['id']);
}
}
// If the order have a coupon and it is no long active
// if ($order['Coupon']['id'] !=0 && !$order['Coupon']['is_active']) {
// SessionComponent::setFlash(' Kuponen i din indkøbskurv blev fjernet fordi den ikke længere er gyldig. '.SessionComponent::read('Message.warning.message'), null, array(), 'warning');
// $this->Order->set($order);
// $this->Order->saveField('coupon_id', null);
// }
}
private function resetOrderItemsPrices($order_id)
{
$order_items = $this->OrderItem->find('all', array('conditions' => array('OrderItem.order_id' => $order_id)));
foreach ($order_items as $key => $order_item) {
$this->OrderItem->set($order_item);
$this->OrderItem->resetPrice();
}
}
public function refresh()
{
// Remove edited or removed items
$this->purgeInactives($this->id);
$this->resetOrderItemsPrices($this->id);
$order = $this->find('first', array('conditions' => array('Order.id' => $this->id), 'recursive' => 2));
// Items order by prices, highest first
$order_items = Set::sort($order['OrderItem'], '{n}.price', 'desc');
$order_price = 0;
$order_saving = 0;
$total_amount_of_items = 0;
$is_only_color_samples = true;
// Run through all items
foreach ($order_items as $key => $order_item) {
$new_total_item_price = $order_item['price'];
if ($order['Coupon']['id'] != 0) {
if ($order_item['yarn_batch_id'] != 0) {
// There exist an item that is not a color sample
$is_only_color_samples = false;
foreach ($order['Coupon']['YarnBatch'] as $key => $yarn_batch_on_coupon) {
if ($yarn_batch_on_coupon['id'] == $order_item['yarn_batch_id']) {
// Calcualte savings
$calculated_savings = $this->calculateSaving(
$yarn_batch_on_coupon['price'],
$order_item['amount'],
$order['Coupon']['percentage_discount'],
$order['Coupon']['actual_discount'],
$order['Coupon']['item_amount']
);
// Was this a better soloution
if ($order_item['saving'] < $order_item['price'] - $calculated_savings['new_total_item_price']) {
$new_total_item_price = $calculated_savings['new_total_item_price'];
$best_coupon['amount_left'] = $calculated_savings['coupon_item_amount_left'];
$best_coupon['id'] = $order['Coupon']['id'];
}
} else {
continue;
}
}
} else if ($order_item['needle_variant_id'] != 0) {
// There exist an item that is not a color sample
$is_only_color_samples = false;
if (!$order_item['NeedleVariant']['is_active']) {
foreach ($order['Coupon']['YarnBatch'] as $key => $yarn_batch_on_coupon) {
if ($needle_variant_on_coupon['id'] == $order_item['needle_variant_id']) {
// Calcualte savings
$calculated_savings = $this->calculateSaving(
$needle_variant_on_coupon['price'],
$order_item['amount'],
$order['Coupon']['percentage_discount'],
$order['Coupon']['actual_discount'],
$order['Coupon']['item_amount']
);
// Was this a better soloution
if ($order_item['saving'] < $order_item['price'] - $calculated_savings['new_total_item_price']) {
$new_total_item_price = $calculated_savings['new_total_item_price'];
$best_coupon['amount_left'] = $calculated_savings['coupon_item_amount_left'];
$best_coupon['id'] = $order['Coupon']['id'];
}
} else {
continue;
}
}
}
} else if ($order_item['recipe_id'] != 0) {
// There exist an item that is not a color sample
$is_only_color_samples = false;
}
$order_item['saving'] = $order_item['price'] - $new_total_item_price;
}
// Calucalte the prices of item
$order_saving += $order_item['saving'];
$order_price += $order_item['price'] - $order_item['saving'];
// Store prices on item
$this->OrderItem->set($order_item);
$this->OrderItem->saveField('saving', $order_item['saving']);
$this->OrderItem->saveField('price', $order_item['price'] - $order_item['saving']);
// Count up the counter
$total_amount_of_items += $order_item['amount'];
}
$shipping_price = 0;
// Calculate shipping prince and remainder (if it is only color samples keep it at 0)
if ($order_price < $this->free_shipping_threshold) {
$shipping_price = $this->shipping_price;
}
$free_shipping_remainder = $this->free_shipping_threshold - $order_price;
$order_price = $order_price + $shipping_price;
// Calculate taxing
$tax = $order_price * $this->tax_rate;
$sub_total = $order_price - $tax;
// Store order data
$this->saveField('shipping_price', $shipping_price);
$this->saveField('free_shipping_remainder', $free_shipping_remainder);
$this->saveField('amount', $total_amount_of_items);
$this->saveField('saving', $order_saving);
$this->saveField('price', $order_price);
$this->saveField('tax', $tax);
$this->saveField('sub_total', $sub_total);
$this->saveField('modified', date('Y-m-d H:i:s'));
}
private function calculateSaving($item_price, $item_amount, $coupon_saving_percent, $coupon_saving_actual, $coupon_item_amount)
{
$new_item_price = 0;
$new_total_item_price = 0;
$coupon_item_amount_left = 0;
// Check if the percentage discount is null, then use actual discount otherwise use percentage
if ($coupon_saving_percent == null) {
$new_item_price = $item_price - $coupon_saving_actual;
$new_item_price = $new_item_price < 0 ? 0 : $new_item_price;
} else {
$new_item_price = $item_price - ($item_price * $coupon_saving_percent/100 );
}
// Check if there is enough to get savings on all of this particular item
if ($item_amount <= $coupon_item_amount) {
$new_total_item_price = $new_item_price * $item_amount;
$coupon_item_amount_left = $coupon_item_amount - $item_amount;
} else {
$new_total_item_price = $new_item_price * $coupon_item_amount + $item_price * ($item_amount - $coupon_item_amount);
$coupon_item_amount_left = $coupon_item_amount;
}
return array('new_total_item_price' => $new_total_item_price, 'coupon_item_amount_left' => $coupon_item_amount_left);
}
public function updateStockQuantityAfterPurchase()
{
// Find the order
$order = $this->find('first', array('conditions' => array('Order.id' => $this->id), 'recursive' => 2));
// Run through all order items in the order
foreach ($order['OrderItem'] as $key => $order_item) {
// Check if the order was a yarn batch
if ($order_item['yarn_batch_id'] != 0) {
// Find the item
$yarn_batch = $this->OrderItem->YarnBatch->find('first', array('conditions' => array('YarnBatch.id' => $order_item['yarn_batch_id'])));
// Calculate new stock amount
$new_stock_quantity = $yarn_batch['YarnBatch']['stock_quantity'] - $order_item['amount'];
$this->OrderItem->YarnBatch->id = $yarn_batch['YarnBatch']['id'];
$this->OrderItem->YarnBatch->saveField('stock_quantity', $new_stock_quantity);
} // Check if the order was a needle variant
else if ($order_item['needle_variant_id'] != 0) {
// Find the item
$needle_variant = $this->OrderItem->NeedleVariant->find('first', array('conditions' => array('NeedleVariant.id' => $order_item['needle_variant_id'])));
// Calculate new stock amount
$new_stock_quantity = $needle_variant['NeedleVariant']['stock_quantity'] - $order_item['amount'];
$this->OrderItem->NeedleVariant->id = $needle_variant['NeedleVariant']['id'];
$this->OrderItem->NeedleVariant->saveField('stock_quantity', $new_stock_quantity);
}
}
// If the order have a coupon and it is no long active
if ($order['Coupon']['id'] != 0 && !$order['Coupon']['is_active']) {
SessionComponent::setFlash(' Kuponnen i din indkøbskurv blev fjernet fordi den ikke længere er gyldig. '.SessionComponent::read('Message.warning.message'), null, array(), 'warning');
$this->Order->set($order);
$this->Order->saveField('coupon_id', null);
}
}
}
答案 0 :(得分：1)
188743680字节是180meg，因此您不会耗费1GB的内存。但是，PHP可能已配置为使用最大180Meg。
你让它在具有2Gb内存的机器上运行的事实是无关紧要的，这是在另一台机器上设置的php.ini memory_limit。
如果您有权访问php.ini文件，则可以通过将memory_limit = 180M修改为更大的数字来更改此限制。
但我想说你的问题更可能与你如何处理结果集有关，所以看看重构查询和处理查询结果的PHP可能是一个好主意。
答案 1 :(得分：0)
可以做的两件事：
1）默认情况下，查询和结果集将返回Entities对象。您可以通过禁用水合作用来检索基本数组：
$query->enableHydration(false);
// Prior to 3.4.0
$query->hydrate(false);
https://book.cakephp.org/3.0/en/orm/retrieving-data-and-resultsets.html#Cake \ ORM \ Table :: find
2）但是，如果您的代码实现（即代码设计）不允许这样做，则可以禁用查询缓冲以流式传输结果：
$query->enableBufferedResults(false);
// Prior to 3.4.0
$query->bufferResults(false);
https://book.cakephp.org/3.0/en/orm/retrieving-data-and-resultsets.html#working-with-result-sets