Handle wide-strings similarly to how normal strings are already handled.
For now support for them is only available in the ODBC backend.
Also add conversion functions between UTF-{8,16,32} and wchar_t and the
tests for them. Note that some of these functions are not used yet, but
provide the complete set as they probably will be in the future.
Co-Authored-By: Vadim Zeitlin <vz-soci@zeitlins.org>
This is unnecessary as it can be recovered from db_type: even if this is
not lossless, we don't really care about it if all we need is data_type,
so simplify the API and the implementation by only having one "type"
parameter instead of two.
No real changes.
Types that refered to non-fixed-size types have been replaced in favor
of their fixed-size types (e.g. dt_integer -> dt_int32, x_short ->
x_int16). To be backwards compatible, we need to keep all of the
previous types though.
Such dialogs can be unexpected and confusing, as reconnection can happen
automatically, and not in a response to a user action.
Implement this by adding a new "reconnect" option and add is_option_on()
helper to connection_parameters to facilitate using it.
This function can be used to check if the connection to the server is
still available (and then, perhaps, call reconnect(), if it isn't).
Implement it for all backends using native API (except for SQLite for
which it always returns true).
Vadim Zeitlin