Core/DBLayer:

- Rewrite Field class to be able to store both binary prepared statement data and data from adhoc query resultsets
- Buffer the data of prepared statements using ResultSet and Field classes and let go of mysql c api structures after PreparedResultSet constructor. Fixes a race condition and thus a possible crash/data corruption (issue pointed out to Derex, basic suggestion by raczman)
- Conform PreparedResultSet and ResultSet to the same design standards, and using Field class as data buffer class for both
* NOTE: This means the fetching methods are uniform again, using ¨Field* fields = result->Fetch();¨ and access to elements trough fields[x].
* NOTE: for access to the correct row in prepared statements, ¨Field* fields = result->Fetch();¨ must ALWAYS be called inside the do { }while(result->NextRow()) loop.
* NOTE: This means that Field::GetString() returns std::string object and Field::GetCString() returns const char* pointer.

Still experimental and all that jazz, not recommended for production servers until feedback is given.

--HG--
branch : trunk

src/server/game/Instances/InstanceSaveMgr.cpp

@@ -239,7 +239,7 @@ void InstanceSaveManager::_DelHelper(const char *fields, const char *table, cons
             std::ostringstream ss;
             for (size_t i = 0; i < fieldTokens.size(); i++)
             {
-                std::string fieldValue = fields[i].GetCppString();
+                std::string fieldValue = fields[i].GetString();
                 CharacterDatabase.escape_string(fieldValue);
                 ss << (i != 0 ? " AND " : "") << fieldTokens[i] << " = '" << fieldValue << "'";
             }