Core/Mysql: Multiple changes

- added support for setting NULL column values to MySQL wrapper in core
- replaced nonstandard strdup function and manual memory management with std::string
- fixed bug in MySQLPreparedStatement::getQueryString method, it failed when string parameter contained embedded '?' symbols
- fixed memory leak in MySQLPreparedStatement::setString method

1 files changed, 5 insertions, 0 deletions

diff --git a/src/server/shared/Database/Field.h b/src/server/shared/Database/Field.h
index 6a2e53032ad..878b806ecb9 100644
--- a/src/server/shared/Database/Field.h
+++ b/src/server/shared/Database/Field.h
@@ -246,6 +246,11 @@ class Field
             return std::string((char*)data.value);
         }
 
+        bool IsNull() const
+        {
+            return data.value == NULL;
+        }
+
     protected:
         Field();
         ~Field();