Sqlite: Generalize invalid id handling

An id is now always saved as a null value and a null value is always
converted to an invalid id if you are requesting an id. It prevents
accidental conversion of null values into a id with the value of zero.
It prevent too writing of the value -1 for an id. This has two
advantages. Sqlite can optimize null values if there are only null
values following in a row. And with strict tables it is forbidden to use
a null value as a key. So there can be no accidential invalid ids
anymore in the database.

Change-Id: I5ec813f2fe8e686324eab6dd632c03d5007e093d
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

0 files changed, 0 insertions, 0 deletions