DB Layer:

- Make SQL Transactions actual objects used in code. (Thanks to Derex for the idea)
* Uncommitted transactions will be automatically rolled back and cleaned up using ACE_Refcounted_Auto_Ptr, so no need to call Rollback() in the code.
* Prevents recursive transactions and makes developers aware of transactions going on.
* Gets rid of unneccesary overhead iterating over a concurrent map.
- Some cleanups in affected code, including better usage of transaction control in AH / mail related code to prevent data loss.

*** Experimental, use at own risk, recommended to backup your DBs. ***

--HG--
branch : trunk

src/server/game/Entities/Item/Item.h

@@ -244,10 +244,10 @@ class Item : public Object
         bool IsBoundAccountWide() const { return (GetProto()->Flags & ITEM_PROTO_FLAG_BIND_TO_ACCOUNT) != 0; }
         bool IsBindedNotWith(Player const* player) const;
         bool IsBoundByEnchant() const;
-        virtual void SaveToDB();
+        virtual void SaveToDB(SQLTransaction& trans);
         virtual bool LoadFromDB(uint32 guid, uint64 owner_guid, QueryResult_AutoPtr result, uint32 entry);
-        virtual void DeleteFromDB();
-        void DeleteFromInventoryDB();
+        virtual void DeleteFromDB(SQLTransaction& trans);
+        void DeleteFromInventoryDB(SQLTransaction& trans);
         void SaveRefundDataToDB();
         void DeleteRefundDataFromDB();