diff --git a/classes/Discount.php b/classes/Discount.php
index d7d180037..2a632f611 100644
--- a/classes/Discount.php
+++ b/classes/Discount.php
@@ -364,7 +364,7 @@ class DiscountCore extends ObjectModel
 		Db::getInstance()->Execute('DELETE FROM `'._DB_PREFIX_.'discount_category` WHERE `id_discount`='.(int)($this->id));
 		foreach($categories AS $category)
 		{
-			Db::getInstance()->Execute('
+			Db::getInstance()->ExecuteS('
 			SELECT `id_discount` 
 			FROM `'._DB_PREFIX_.'discount_category`
 			WHERE `id_discount`='.(int)($this->id).' AND `id_category`='.(int)($category));
diff --git a/classes/Module.php b/classes/Module.php
index 91028c119..9562a7084 100644
--- a/classes/Module.php
+++ b/classes/Module.php
@@ -817,7 +817,7 @@ abstract class ModuleCore
 
 	public static function isInstalled($moduleName)
 	{
-		Db::getInstance()->Execute('SELECT `id_module` FROM `'._DB_PREFIX_.'module` WHERE `name` = \''.pSQL($moduleName).'\'');
+		Db::getInstance()->ExecuteS('SELECT `id_module` FROM `'._DB_PREFIX_.'module` WHERE `name` = \''.pSQL($moduleName).'\'');
 		return (bool)Db::getInstance()->NumRows();
 	}
 
diff --git a/classes/Product.php b/classes/Product.php
index 196af8993..1a6919f83 100644
--- a/classes/Product.php
+++ b/classes/Product.php
@@ -2310,7 +2310,7 @@ class ProductCore extends ObjectModel
 
 	public static function duplicateTags($id_product_old, $id_product_new)
 	{
-		$resource = Db::getInstance()->Execute('SELECT `id_tag` FROM `'._DB_PREFIX_.'product_tag` WHERE `id_product` = '.(int)($id_product_old));
+		$resource = Db::getInstance()->ExecuteS('SELECT `id_tag` FROM `'._DB_PREFIX_.'product_tag` WHERE `id_product` = '.(int)($id_product_old));
 		if (!Db::getInstance()->NumRows())
 			return true;
 		$query = 'INSERT INTO `'._DB_PREFIX_.'product_tag` (`id_product`, `id_tag`) VALUES';
@@ -2322,7 +2322,7 @@ class ProductCore extends ObjectModel
 
 	public static function duplicateDownload($id_product_old, $id_product_new)
 	{
-		$resource = Db::getInstance()->Execute('SELECT `display_filename`, `physically_filename`, `date_deposit`, `date_expiration`, `nb_days_accessible`, `nb_downloadable`, `active` FROM `'._DB_PREFIX_.'product_download` WHERE `id_product` = '.(int)($id_product_old));
+		$resource = Db::getInstance()->ExecuteS('SELECT `display_filename`, `physically_filename`, `date_deposit`, `date_expiration`, `nb_days_accessible`, `nb_downloadable`, `active` FROM `'._DB_PREFIX_.'product_download` WHERE `id_product` = '.(int)($id_product_old));
 		if (!Db::getInstance()->NumRows())
 			return true;
 		$query = 'INSERT INTO `'._DB_PREFIX_.'product_download` (`id_product`, `display_filename`, `physically_filename`, `date_deposit`, `date_expiration`, `nb_days_accessible`, `nb_downloadable`, `active`) VALUES';
@@ -2819,7 +2819,7 @@ class ProductCore extends ObjectModel
 		if (isset(self::$_incat[md5($sql)]))
 			return self::$_incat[md5($sql)];
 
-		if (!Db::getInstance(_PS_USE_SQL_SLAVE_)->Execute($sql))
+		if (!Db::getInstance(_PS_USE_SQL_SLAVE_)->ExecuteS($sql))
 			return false;
 		self::$_incat[md5($sql)] =  (Db::getInstance(_PS_USE_SQL_SLAVE_)->NumRows() > 0 ? true : false);
 		return self::$_incat[md5($sql)];
diff --git a/modules/blockwishlist/WishList.php b/modules/blockwishlist/WishList.php
index 69a8fe34a..12105d125 100644
--- a/modules/blockwishlist/WishList.php
+++ b/modules/blockwishlist/WishList.php
@@ -449,7 +449,7 @@ class		WishList extends ObjectModel
 			$quantity > $result['quantity'])
 			return (false);
 
-			Db::getInstance()->Execute('
+			Db::getInstance()->ExecuteS('
 			SELECT *
 			FROM `'._DB_PREFIX_.'wishlist_product_cart`
 			WHERE `id_wishlist_product`='.(int)($result['id_wishlist_product']).' AND `id_cart`='.(int)($id_cart)