// A few dozens queries less on every pages...

classes/AddressFormat.php

@@ -508,20 +508,21 @@ class AddressFormatCore extends ObjectModel
 	public function getFormat($id_country)
 	{
 		$out = $this->_getFormatDB($id_country);
-
+		if (empty($out))
-		if (strlen(trim($out)) == 0)
 			$out = $this->_getFormatDB(Configuration::get('PS_COUNTRY_DEFAULT'));
 		return $out;
 	}
 
 	protected function _getFormatDB($id_country)
 	{
-		$result = Db::getInstance()->getRow('
+		if (!Cache::isStored('AddressFormat::_getFormatDB'.$id_country))
+		{
+			$format = Db::getInstance()->getValue('
 			SELECT format
 			FROM `'._DB_PREFIX_.$this->def['table'].'`
-		WHERE `id_country` = '.(int)($id_country));
+			WHERE `id_country` = '.(int)$id_country);
-
+			Cache::store('AddressFormat::_getFormatDB'.$id_country, trim($format));
-		return isset($result['format']) ? trim($result['format']) : '';
+		}
+		return Cache::retrieve('AddressFormat::_getFormatDB'.$id_country);
 	}
 }
-

classes/Cart.php

@@ -278,6 +278,8 @@ class CartCore extends ObjectModel
 		if (!CartRule::isFeatureActive() || !$this->id)
 			return array();
 			
+		if (!Cache::isStored('Cart::getCartRules'.$this->id))
+		{
 			$total_products_ti = $this->getOrderTotal(true, Cart::ONLY_PRODUCTS);
 			$total_products_te = $this->getOrderTotal(false, Cart::ONLY_PRODUCTS);
 			$shipping_ti = $this->getTotalShippingCost();
@@ -309,7 +311,9 @@ class CartCore extends ObjectModel
 				$row['description'] = $row['name'];
 			}
 			
-		return $result;
+			Cache::store('Cart::getCartRules'.$this->id, $result);
+		}
+		return Cache::retrieve('Cart::getCartRules'.$this->id);
 	}
 
 	public function getDiscountsCustomer($id_cart_rule)
@@ -702,6 +706,8 @@ class CartCore extends ObjectModel
 		)))
 			return false;
 	
+		Cache::clean('Cart::getCartRules'.$this->id);
+	
 		if ((int)$cartRule->gift_product)
 			return $this->updateQty(1, $cartRule->gift_product);
 
@@ -1016,6 +1022,7 @@ class CartCore extends ObjectModel
 
 	public function removeCartRule($id_cart_rule)
 	{
+		Cache::clean('Cart::getCartRules'.$this->id);
 		return Db::getInstance()->Execute(
 			'DELETE FROM `'._DB_PREFIX_.'cart_cart_rule`
 			WHERE `id_cart_rule` = '.(int)$id_cart_rule.'

classes/Category.php

@@ -663,8 +663,7 @@ class CategoryCore extends ObjectModel
 					ON m.`id_manufacturer` = p.`id_manufacturer`
 				WHERE cp.`id_category` = '.(int)$this->id
 					.($active ? ' AND p.`active` = 1' : '')
-					.($id_supplier ? ' AND p.id_supplier = '.(int)$id_supplier : '').
+					.($id_supplier ? ' AND p.id_supplier = '.(int)$id_supplier : '');
-					' GROUP BY p.id_product';
 
 		if ($random === true)
 		{

classes/Module.php

@@ -223,6 +223,8 @@ abstract class ModuleCore
 		}
 		$this->id = Db::getInstance()->Insert_ID();
 
+		Cache::clean('Module::isInstalled'.$this->name);
+		
 		// Enable the module for all shops
 		$this->enable(true);
 
@@ -457,7 +459,13 @@ abstract class ModuleCore
 		Group::truncateRestrictionsByModule($this->id);
 
 		// Uninstall the module
-		return Db::getInstance()->execute('DELETE FROM `'._DB_PREFIX_.'module` WHERE `id_module` = '.(int)$this->id);
+		if (Db::getInstance()->execute('DELETE FROM `'._DB_PREFIX_.'module` WHERE `id_module` = '.(int)$this->id))
+		{
+			Cache::clean('Module::isInstalled'.$this->name);
+			return true;
+		}
+		
+		return false;
 	}
 
 	/**
@@ -1437,8 +1445,12 @@ abstract class ModuleCore
 
 	public static function isInstalled($module_name)
 	{
-		Db::getInstance()->executeS('SELECT `id_module` FROM `'._DB_PREFIX_.'module` WHERE `name` = \''.pSQL($module_name).'\'');
+		if (!Cache::isStored('Module::isInstalled'.$module_name))
-		return (bool)Db::getInstance()->NumRows();
+		{
+			$id_module = Db::getInstance()->getValue('SELECT `id_module` FROM `'._DB_PREFIX_.'module` WHERE `name` = \''.pSQL($module_name).'\'');
+			Cache::store('Module::isInstalled'.$module_name, (bool)$id_module);
+		}
+		return Cache::retrieve('Module::isInstalled'.$module_name);
 	}
 
 	public function isRegisteredInHook($hook)