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Sql query return :false


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Hello to all,

I tried to execute sql query to get all info about CartRule by ID of cart rule (need product_id cart rule using and description of the cart rule.

			$sql = new DbQuery();
            $sql->where('id_cart_rule = .$voucher_int');
            $tar = Db::getInstance()->executeS($sql);

But the return is bool(false)


What is the problem?

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