在Magento集合中使用“具有”问题

我正在尝试在Magento管理模块中为网格构建自定义集合。我创建了一个名为“ addAttributeHaving”的新收集方法，该方法仅执行以下操作：

public function addAttributeHaving($value)
{
    $this->getSelect()->having($value);
    return $this;
}

请参阅收集代码：

$collection->addFieldToSelect(
    array(
        'entity_id',
        'created_at',
        'increment_id',
        'customer_email',
        'customer_firstname',
        'customer_lastname',
        'grand_total',
        'status'
    )
);

$collection->getSelect()->joinLeft(array('sfop' => 'sales_flat_order_payment'), 'main_table.entity_id = sfop.parent_id', 'sfop.amount_authorized');
$collection->getSelect()->columns('sum(sfop.amount_authorized) AS AUTHD');
$collection->getSelect()->columns('grand_total - sum(sfop.amount_authorized) AS DIF_AU');
$collection->addFieldToFilter('main_table.state', array('in' => array('new','payment_review')));
$collection->addFieldToFilter('main_table.sd_order_type', array('neq' => 7));
$collection->addFieldToFilter('sfop.method', array('neq' => 'giftcard'));
$collection->addFieldToFilter('main_table.created_at', array('gt' => $this->getFilterDate()));
$collection->getSelect()->group(array('main_table.entity_id'));
$collection->addAttributeHaving('DIF_AU <> 0');
$collection->load(true,true);

$this->setCollection($collection);

这将产生以下SQL，该SQL执行得很好，并且在Magento之外运行时会产生预期的结果。

[METHOD=Varien_Data_Collection_Db->printLogQuery] SELECT `main_table`.`entity_id`, `main_table`.`entity_id`, `main_table`.`created_at`, `main_table`.`increment_id`, `main_table`.`customer_email`, `main_table`.`customer_firstname`, `main_table`.`customer_lastname`, `main_table`.`grand_total`, `main_table`.`status`, `sfop`.`amount_authorized`, sum(sfop.amount_authorized) AS `AUTHD`, grand_total - sum(sfop.amount_authorized) AS `DIF_AU` FROM `sales_flat_order` AS `main_table` LEFT JOIN `sales_flat_order_payment` AS `sfop` ON main_table.entity_id = sfop.parent_id WHERE (main_table.state in ('new', 'payment_review')) AND (main_table.sd_order_type != 7) AND (sfop.method != 'giftcard') AND (main_table.created_at > '2013-04-07') GROUP BY `main_table`.`entity_id` HAVING (DIF_AU <> 0)

但是，当我尝试在Magento中加载网格时，出现以下错误：

SQLSTATE [42S22]：找不到列：1054“具有子句”中的未知列“ DIF_AU”

此外，如果删除了hading子句（这会破坏我的结果），则可以将DIF_AU列用于Grid中的数据源。

我将在这里实际回答我自己的问题。我知道，俗气，但是当我更仔细地查看实际堆栈跟踪时，我偶然发现了答案。集合可以很好地加载，但是，当我们尝试在Varien_Data_Collection_Db :: getSelectCountSql（）中获取集合计数时，失败会在执行的稍后出现。由此产生的SQL是：

SELECT COUNT(*) FROM sales_flat_order AS main_table LEFT JOIN sales_flat_order_payment AS sfop ON main_table.entity_id = sfop.parent_id WHERE (main_table.state in ('payment_review')) AND (main_table.sd_order_type != 7) AND (sfop.method != 'giftcard') AND (main_table.created_at > '2013-04-07') GROUP BY main_table.entity_id HAVING (DIF_AU <> 0)

您会注意到HAVING语句已附加，但我们不再为DIF_AU列定义。似乎我将需要在我的收集类中扩展自定义getSelectCountSql（）以获得正确的记录计数。

我在自定义集合类中创建了扩展的getSelectCountSql（），将其添加回Have语句所需的缺少列中。

public function getSelectCountSql()
  {
    $countSelect = parent::getSelectCountSql();
    $countSelect->columns('grand_total - sum(sfop.amount_authorized) AS DIF_AU');
    $countSelect->reset(Zend_Db_Select::GROUP);
    return $countSelect;
  }

首先$countSelect->reset(Zend_Db_Select::HAVING);意味着它将HAVING从您的收藏中重置。这意味着它将删除having子句。而且它不是您想要的。您可能需要将其添加到集合中（app/code/core/Mage/Catalog/Model/Resource/Product/Collection.php->_getSelectCountSql()此处）。

但主要的罪魁祸首getSize()是lib/Varien/Data/Collection/Db.php文件中存在的方法。

我尝试了@Anthony提到的上述解决方案，但是没有用。

现在我做了以下。

public function getSize()
{
    if (is_null($this->_totalRecords)) {
        //$sql = $this->getSelectCountSql();
        $sql = $this->getSelect();
        $this->_totalRecords = count($this->getConnection()->fetchAll($sql, $this->_bindParams));
    }
    return intval($this->_totalRecords);
}

检查我什至没有使用getSelectCountSql()。我只是读取整个SQL查询，并获取所有数据并返回其计数。就这样。

我在这里解决了这个问题：app / code / core / Mage / Catalog / Model / Resource / Product / Collection.php：943添加此：$ select-> reset（Zend_Db_Select :: HAVING）;

只需将app / code / core / Mage / Catalog / Model / Resource / Product / Collection.php复制到app / code / local / Mage / Catalog / Model / Resource / Product / Collection.php

我的代码现在看起来像这样：

/**
 * Build clear select
 *
 * @param Varien_Db_Select $select
 * @return Varien_Db_Select
 */
protected function _buildClearSelect($select = null)
{
    if (is_null($select)) {
        $select = clone $this->getSelect();
    }
    $select->reset(Zend_Db_Select::ORDER);
    $select->reset(Zend_Db_Select::LIMIT_COUNT);
    $select->reset(Zend_Db_Select::LIMIT_OFFSET);
    $select->reset(Zend_Db_Select::COLUMNS);
    $select->reset(Zend_Db_Select::HAVING);

如果您的选择具有唯一的列名称，则此解决方案将起作用，因为子查询选择列表中的任何列都必须具有唯一的名称。

子查询：表子查询允许重复的列名

public function getSelectCountSql()
{
    $this->_renderFilters();
    $select = clone $this->getSelect();
    $select->reset(Zend_Db_Select::ORDER);
    $select->reset(Zend_Db_Select::LIMIT_COUNT);
    $select->reset(Zend_Db_Select::LIMIT_OFFSET);        

    $countSelect = clone $this->getSelect();
    $countSelect->reset();
    $countSelect->from(array('a' => $select), 'COUNT(*)');
    return $countSelect;
}

PS：这个答案适用于一般的magento收藏。仅与产品收集无关。

这工作

公共功能getSize（）{if（is_null（$ this-> _ totalRecords））{// $ sql = $ this-> getSelectCountSql（）; $ sql = $ this-> getSelect（）; $ this-> _ totalRecords = count（$ this-> getConnection（）-> fetchAll（$ sql，$ this-> _ bindParams））; } return intval（$ this-> _ totalRecords）; }