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/shared/Database/QueryHolder.cpp

@@ -89,13 +89,6 @@ QueryResult SQLQueryHolder::GetResult(size_t index)
     // Don't call to this function if the index is of an ad-hoc statement
     if (index < m_queries.size())
     {
-        /// the query strings are freed on the first GetResult or in the destructor
-        if (SQLElementData* data = &m_queries[index].first)
-        {
-            free((void*)(const_cast<char*>(data->element.query)));
-            data->element.query = NULL;
-        }
-
         ResultSet* result = m_queries[index].second.qresult;
         if (!result || !result->GetRowCount())
             return QueryResult(NULL);
@@ -112,18 +105,10 @@ PreparedQueryResult SQLQueryHolder::GetPreparedResult(size_t index)
     // Don't call to this function if the index is of a prepared statement
     if (index < m_queries.size())
     {
-        /// the query strings are freed on the first GetResult or in the destructor
-        if (SQLElementData* data = &m_queries[index].first)
-        {
-            delete data->element.stmt;
-            data->element.stmt = NULL;
-        }
-
         PreparedResultSet* result = m_queries[index].second.presult;
         if (!result || !result->GetRowCount())
             return PreparedQueryResult(NULL);
 
-        result->NextRow();
         return PreparedQueryResult(result);
     }
     else