Selena Deckelmann sdeckelmann at chrisking.com
Tue Jul 17 15:48:54 PDT 2007

On Jul 17, 2007, at 2:58 PM, Roderick A. Anderson wrote:

> How does/ or does DBI handle row level locks that Postgresql (and I
> think Oracle) provides.  Do they apply to the database handle ($dbh)?
> So if,
> ###
> my $sth = $dbh->prepare(q{SELECT the, info FROM thetable WHERE the  
> = 'R'

Not a perl solution -- but you could add a column or a table that  
tracks which rows that you are currently processing.

Maybe I shouldn't admit this (don't hurt me, Randal!) - but I have a  
printing system for barcode printers that could get accessed by a  
variety of people at the same time.  I change the status inside a  
transaction to reference the process ID (and the print logfiles have  
the PIDs in them). That way, when there's a failure, I can track link  
it to a specific file that was printed (all the files have the PID  
embedded in them). Also, if two jobs get called simultaneously,  
there's no double-printing.

This type of thing gets you out of the business of policing your cron  


More information about the Pdx-pm-list mailing list