Hello all. I'm trying to fix a problem in DBIx::Timeout where a warning gets printed when the timeout kills a MySQL thread. This warning isn't affected by the DBI Warn or PrintWarn attributes. It looks like:

   DBD::mysql::db selectcol_arrayref failed: Unknown error at ...

I can catch it with $SIG{__WARN__} but I'm having a hard time figuring out where it's coming from. I tried sticking a call to Devel::StackTrace in a $SIG{__WARN__} handler, but that didn't show me a source. I also tried greping DBD::mysql and DBI for the warning text, without luck.

Any ideas about how I can find the source of this warning?

UPDATE: I found the source of the warning. The DBI PrintError attribute was set on, and amazingly can't be turned off after connect(). Trying to set this attribute to 0 turns it on as surely as 1. Remind me again why DBI had to reimplement hashes?

UPDATE 2: Ok, it seems you can turn PrintError off, but connect_cached() will turn it back on. Stills seems wrong, but less wrong than not being able to turn it off at all.

-sam

In reply to Tracing a warning by samtregar

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