Fixed problem where if a table had no insertable columns, construction of the insertion statemtent would fail, which then would cause unstable behavior at a later time. Now if Insert() is called and there are no insertable columns, insert will return a failure.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_2_BRANCH@7446 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/dbtable.h

@@ -98,6 +98,7 @@ private:
 
     // Private member variables
     UDWORD cursorType;
+    bool   insertable;
 
     // Private member functions
     bool bindInsertParams(void);