Question

Transparent wrapper around DBI for debugging purposes

Asked by: dorward

I have a large code base (which runs under mod_perl) to which I would like to add some debugging code.

I would like to be able to run a bit of code everytime DBI is used to connect, prepare or execute. How can I add this debugging code _without_ editing every call to those methods and _without_ editing the DBI module itself.

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Asked On
2004-09-08 at 03:07:33ID21122718
Tags

wrapper

,

perl

,

dbi

,

transparent

Topic

Perl Programming Language

Participating Experts
1
Points
500
Comments
4

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Answers

 

by: kanduraPosted on 2004-09-08 at 03:50:05ID: 12004898

DBI can generate debugging information itself:

set
    DBI->trace(2 => "/tmp/logfile");
somewhere near the top of your script.
Or set the environment variable
    DBI_PROFILE=2

See manuals for DBI::Profile and DBI::Trace.

(Found this at http://www.class-dbi.com/cgi-bin/wiki/index.cgi?SeeAllSQL)

 

by: kanduraPosted on 2004-09-08 at 03:55:49ID: 12004939

Also see DBI::ProfileDumper::Apache.

Here's the synopsis from the manual:

Add this line to your httpd.conf:

  PerlSetEnv DBI_PROFILE DBI::ProfileDumper::Apache

Then restart your server. Access the code you wish to test using a web browser, then shutdown your server. This will create a set of dbi.prof.* files in your Apache log directory. Get a profiling report with dbiprof:

  dbiprof /usr/local/apache/logs/dbi.prof.*

When you're ready to perform another profiling run, delete the old files

  rm /usr/local/apache/logs/dbi.prof.*

and start again.

20120131-EE-VQP-002

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