Prestashop SQL Manager GROUP BY date - mysql

Question

I'm writing some queries for the SQL Manager in Prestashop.
I want to group by month like so:
SELECT AVG(total_products)
FROM ps_order_invoice
GROUP BY YEAR(delivery_date), MONTH(delivery_date)
But the SQL Manager refuse to save it, displaying for only message "Error".
I could not find more information about the limitation on the SQL Manager except only SELECT queries are accepted.
However, I can save the query if I remove the YEAR and MONTH functions.
Note: Unfortunately, I don't have access to the phpmyadmin

Answer 1

I installed a fresh prestashop-1.6.0.6 and was able to get your error.
After inspecting the code I found that the problem comes from the RequestSql class.
The cutAttribute method can't parse attributes like "YEAR(delivery_date)". It returns a string like "YEARdelivery_date" instead of "delivery_date".
To solve this problem you can override this class and use the cutAttribute method from the last prestashop version available.
Create a file named "RequestSql.php" located in "override/classes" with this content:
class RequestSql extends RequestSqlCore
{
/**
* Cut an attribute with or without the alias
*
* #param $attr
* #param $from
* #return array|bool
*/
public function cutAttribute($attr, $from)
{
$matches = array();
if (preg_match('/((`(\()?([a-z0-9_])+`(\))?)|((\()?([a-z0-9_])+(\))?))\.((`(\()?([a-z0-9_])+`(\))?)|((\()?([a-z0-9_])+(\))?))$/i', $attr, $matches, PREG_OFFSET_CAPTURE)) {
$tab = explode('.', str_replace(array('`', '(', ')'), '', $matches[0][0]));
if ($table = $this->returnNameTable($tab[0], $from)) {
return array(
'table' => $table,
'alias' => $tab[0],
'attribut' => $tab[1],
'string' => $attr
);
}
} elseif (preg_match('/((`(\()?([a-z0-9_])+`(\))?)|((\()?([a-z0-9_])+(\))?))$/i', $attr, $matches, PREG_OFFSET_CAPTURE)) {
$attribut = str_replace(array('`', '(', ')'), '', $matches[0][0]);
if ($table = $this->returnNameTable(false, $from, $attr)) {
return array(
'table' => $table,
'attribut' => $attribut,
'string' => $attr
);
}
}
return false;
}
}
And remove the file "cache/class_index.php" otherwise the override won't be find.