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Unfortunately, I don't see any other solution. I browsed everything I=20 could in ODBC doc, in order to be able to query link status, but there's =
no way.
And the other solution to redo the whole statement in case of failure=20 would be even more complex and would require too many code rewrites due=20 to a complete logic change. So, it seems to me to be the intermediate=20 solution.
The overhead being limited on "decent" connection.
Regards,
On 07/07/2013 14:33, Michael Str=F6der wrote:
pierre@reactos.org wrote:
With this patch, before preparing any req on the given connection=20 handle, the backend will first try to check whether the connection is active by=20 issue a dummy query. In case it's not, it will close the previous connection=20 and open a new one. And then, will prepare the req on the connection link.
I made this choice of developement because, preparing statement,=20 executing it and then, only looking whether it fails to re-submit would have been=20 more complex, since it would have required to start over the whole process =
for the query (statement preparation and such) while preparation & execution=20 aren't not in the same function.
Hmm, so there's an extra dummy query for each real query. If the SQL=20 DB is connected over network this means a synchronous extra round trip =
for each query.
Ciao, Michael.
--=20 Pierre Schweitzer<pierre at reactos.org> System Administrator ReactOS Foundation
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pierre＠reactos.org