Matthew J Harriger wrote:
I am using just the SteadyDB module from DBUtils to provide fault-tolerant
connections to an Oracle database using cx_Oracle as the dbapi2 module. If
a client loses its network connection (network cable unplugged, out of
range of the wireless network, etc.), and then re-establishes the
connection, all Oracle connections and cursors that were open become
invalid. Trying to execute a statement with one of those cursors returns
an ORA-03114 NOT CONNECTED TO ORACLE error, which causes cx_Oracle to
raise an exception of class DatabaseError. However, SteadyDB only tries to
recover from OperationlError and InternalError exceptions(SteadyDB.py,
lines 238 and 338). Any chance that SteadyDB could be changed in future
versions to also recover from DatabaseErrors? Or perhaps there could be a
mechanism for advanced users to set what exception types SteadyDB tries to
recover from? Should I submit this as a bug?
DatabaseError is very unspecific: I think cx_Oracle should really raise
an OperationalError instead.
I have noted this problem and will try myself next time I come across
Oracle again.
Can you also double check if it's really a DatabaseError and maybe ask
the cx_Oracle folks whether this is intended? I currently only see they
raise InterfaceErrors which would also be a problem:
http://cx-oracle.svn.sourceforge.net/viewvc/cx-oracle/trunk/Connection.c?view=markup
Making the error classes configurable is also a good idea, but we need
to find a good default set and and I'd also like to see cx_Oracle fixed
since I think OperationlError is the only correct exception for
connection loss (the InternalError was already a concession).
-- Christoph
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