Also expands the tst_qsqlquery::batchExec() test to account for this
case and generally test the functionality. In addition it is made to be
more robust to avoid any discrepencies with the testing data. The test
in general is also cleaned up to enable more of it being tested with
the different database drivers where possible.
An expected fail is added for MySQL due to the fact that it has a bug
where null timestamp entries are being converted to the current
datetime when adding it as a bind value.
Change-Id: I0061bd1c69ae35b4858afc49420f13ce59cf48ae
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
7775eb248a