Collections 如何循环Magento集合？

基本上，我需要获取客户的CSV文件，每天以脚本自动生成。 我试过几种方法，但都太慢了，或者实际上已经没有记忆了

*1） foreach通过集合资源*

2） foreach和load客户

$collection = Mage::getResourceModel('customer/customer_collection');
foreach($collection as $customer) {
  $fullcustomer = Mage::getModel("customer/customer")->load($customer->getId());
  echo $fullcustomer->getFirstname() . ",";
}

有什么想法吗

谢谢

在每个客户对象上使用

load（）

会大大降低代码的速度。我建议您将所需属性添加到集合中的第一种方法是正确的，但请使用以下方法完成：

$collection->toArray([$arrRequiredFields = array()]);

这样，就不会加载单个客户，但是

toArray（）

（）将为您提供所需的字段，然后您可以迭代多维数组以生成逗号分隔的字符串

---

或者，您可以尝试

$collection->toXml（）

，如果您对此感到满意的话，可以使用XML。Google将为您指出xml->csv转换方法。

尝试为大型集合分页

这样做的目的是，如果可以将集合装入更小的块中，那么就不会占用那么多内存。 加载一个区块（页面），然后对其执行一些操作，例如将其保存到文本文件，然后加载下一个区块。结果是，您使用了整个较大的集合，但只产生了最大页面的内存开销

我们使用类似的东西从我们的商店出口订单。 我插入了你的收藏，它似乎起作用了

<?php

 if(php_sapi_name()!=="cli"){
 echo "Must be run from the command line.";
 };

/**
 * Setup a magento instance so we can run this export from the command line.
 */

require_once('app/Mage.php');
umask(0);

if (!Mage::isInstalled()) {
    echo "Application is not installed yet, please complete install wizard first.";
    exit;
}

// Only for urls // Don't remove this
$_SERVER['SCRIPT_NAME'] = str_replace(basename(__FILE__), 'index.php', $_SERVER['SCRIPT_NAME']);
$_SERVER['SCRIPT_FILENAME'] = str_replace(basename(__FILE__), 'index.php', $_SERVER['SCRIPT_FILENAME']);

Mage::app('admin')->setUseSessionInUrl(false);
Mage::setIsDeveloperMode(true); ini_set('display_errors', 1); error_reporting(E_ALL);

try {
    Mage::getConfig()->init();
    Mage::app();   
} catch (Exception $e) {
    Mage::printException($e);
}
ini_set('memory_limit','500M');

$customerCount = 0;
try{
    //configure the collection filters.
    $collection = Mage::getResourceModel('customer/customer_collection')
    ->addAttributeToSelect('email')
    ->addAttributeToSelect('created_at')
    ->joinAttribute('billing_company', 'customer_address/company', 'default_billing', null, 'left')
    ->joinAttribute('billing_street', 'customer_address/street', 'default_billing', null, 'left')
    ->joinAttribute('billing_postcode', 'customer_address/postcode', 'default_billing', null, 'left')
    ->joinAttribute('billing_telephone', 'customer_address/telephone', 'default_billing', null, 'left')
    ->joinAttribute('billing_city', 'customer_address/city', 'default_billing', null, 'left')
    ->joinAttribute('billing_region', 'customer_address/region', 'default_billing', null, 'left')
    ->joinAttribute('billing_country_id', 'customer_address/country_id', 'default_billing', null, 'left');

    //Add a page size to the result set.
    $collection->setPageSize(100);
    //discover how many page the result will be.
    $pages = $collection->getLastPageNumber();
    $currentPage = 1;
    //This is the file to append the output to.
    $fp = fopen('/tmp/customers.csv', 'w');
    do{
         //Tell the collection which page to load.
         $collection->setCurPage($currentPage);
         $collection->load();
         foreach ($collection as $customer){
            //write the collection array as a CSV.
            $customerArray = $customer->toArray();
            //var_dump($customerArray); echo "\n\n";
            fputcsv($fp, $customerArray);
            $customerCount++;
         }
         $currentPage++;
         //make the collection unload the data in memory so it will pick up the next page when load() is called.
         $collection->clear();
    } while ($currentPage <= $pages);
    fclose($fp);
} catch (Exception $e) {
    //$response['error'] = $e->getMessage();
    Mage::printException($e);
}
echo "Saved $customerCount customers to csv file \n";
?>

---

这两种解决方案似乎都可行，但似乎都不是特别理想的。你能用这两种方法更新你的帖子吗，这样我们就可以知道你在找什么了？试着在Magento中使用资源迭代器。请看这篇文章：分页集合绝对是一条正确的道路。它速度非常快，内存效率也更高。不过，我注意到在使用它时，每个页面的处理时间都比前一页长。这就好像collection->clear（）并没有真正释放内存，或者发生了其他事情。
<?php

 if(php_sapi_name()!=="cli"){
 echo "Must be run from the command line.";
 };

/**
 * Setup a magento instance so we can run this export from the command line.
 */

require_once('app/Mage.php');
umask(0);

if (!Mage::isInstalled()) {
    echo "Application is not installed yet, please complete install wizard first.";
    exit;
}

// Only for urls // Don't remove this
$_SERVER['SCRIPT_NAME'] = str_replace(basename(__FILE__), 'index.php', $_SERVER['SCRIPT_NAME']);
$_SERVER['SCRIPT_FILENAME'] = str_replace(basename(__FILE__), 'index.php', $_SERVER['SCRIPT_FILENAME']);

Mage::app('admin')->setUseSessionInUrl(false);
Mage::setIsDeveloperMode(true); ini_set('display_errors', 1); error_reporting(E_ALL);

try {
    Mage::getConfig()->init();
    Mage::app();   
} catch (Exception $e) {
    Mage::printException($e);
}
ini_set('memory_limit','500M');

$customerCount = 0;
try{
    //configure the collection filters.
    $collection = Mage::getResourceModel('customer/customer_collection')
    ->addAttributeToSelect('email')
    ->addAttributeToSelect('created_at')
    ->joinAttribute('billing_company', 'customer_address/company', 'default_billing', null, 'left')
    ->joinAttribute('billing_street', 'customer_address/street', 'default_billing', null, 'left')
    ->joinAttribute('billing_postcode', 'customer_address/postcode', 'default_billing', null, 'left')
    ->joinAttribute('billing_telephone', 'customer_address/telephone', 'default_billing', null, 'left')
    ->joinAttribute('billing_city', 'customer_address/city', 'default_billing', null, 'left')
    ->joinAttribute('billing_region', 'customer_address/region', 'default_billing', null, 'left')
    ->joinAttribute('billing_country_id', 'customer_address/country_id', 'default_billing', null, 'left');

    //Add a page size to the result set.
    $collection->setPageSize(100);
    //discover how many page the result will be.
    $pages = $collection->getLastPageNumber();
    $currentPage = 1;
    //This is the file to append the output to.
    $fp = fopen('/tmp/customers.csv', 'w');
    do{
         //Tell the collection which page to load.
         $collection->setCurPage($currentPage);
         $collection->load();
         foreach ($collection as $customer){
            //write the collection array as a CSV.
            $customerArray = $customer->toArray();
            //var_dump($customerArray); echo "\n\n";
            fputcsv($fp, $customerArray);
            $customerCount++;
         }
         $currentPage++;
         //make the collection unload the data in memory so it will pick up the next page when load() is called.
         $collection->clear();
    } while ($currentPage <= $pages);
    fclose($fp);
} catch (Exception $e) {
    //$response['error'] = $e->getMessage();
    Mage::printException($e);
}
echo "Saved $customerCount customers to csv file \n";
?>