Providers enumeration should not be continued on most of errors taking place in
the provider
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Key: CORE-4911
URL: http://tracker.firebirdsql.org/browse/CORE-4911
Project: Firebird Core
Issue Type: Improvement
Affects Versions: 3.0 Beta 2, 3.0 Beta 1, 3.0 Alpha 2, 3.0 Alpha 1
Reporter: Alexander Peshkov
Most of errors, taking place in providers, are fatal, and there is no use
trying other providers when such errors take place.
For example, if remote redirector detected that format of database connection
string matches some protocol, it's no use trying other providers if connection
on that protocol failed. Or when engine reported some internal database error
(except invalid ODS version) it's no use trying to open that database with
loopback provider.
It seems that it's better to enumerate error codes after which trying other
providers makes sense - that's first of all isc_unavailable and isc_no_priv,
but due to historical reasons (content of status vector for known conditions
should be kept as it was) adding some more error codes is needed.
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