The QOCIDateTime destructor carefully checks that dateTime is non-null
before tidying it away, but the constructor allocated it independently
of whether it was used, leaving it in a still-not-constructed state if
the date-time it was to represent was invalid.
Only allocate if the date-time is valid; and check against null when
an OCIDateTime is being converted back to QDateTime. Add warnings if
either allocation or construction fails. Incidentally use
static_cast<> instead of C-casting (and split a long line) in the
other place that allocates an OCIDateTime descriptor.
Pick-to: 6.2 5.15
Task-number: QTBUG-98471
Change-Id: Idd5531d9f7101878802cb9a3a016d3fd80903543
Reviewed-by: Andy Shaw <andy.shaw@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
064c3d35e6