Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl Monk, Perl Meditation
 
PerlMonks  

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??
I've recently revisited an old project that uses Log::Log4perl, and decided it would be good to have it log to both a file and an SQL database. In future, it will also want to send output to sockets, but that's another story. So, I happily poked around the internet and found out how to use the DBI Appender, and all was working fine until I made an actual complex logging statement. Then, I ran into the dread Log4perl: DBI appender error: 'called with 6 bind variables when 5 are needed' Of course! As suggested, I had set the layout to NoopLayout and used bound parameters... which works just fine when using a single fixed string as your logged data, but of course most of my real logging is done using the logger as if it were sprintf.
$log->info("Data directory: %s", $options->{'dir'});
My naive through was to pass a coderef in as the warp_message parameter, hoping I could just have it do the sprintf conversion to flatten things into a single argument that would become the last bound parameter passed...
my $spr = sub { my $fmt = shift; return sprintf $fmt, @_; };
and then...
my $conf = qq! log4perl.rootLogger = TRACE, DBAppndr log4perl.appender.DBAppndr = Log::Log4perl::Appender::DBI log4perl.appender.DBAppndr.datasource = $dsn log4perl.appender.DBAppndr.username = $db_user log4perl.appender.DBAppndr.password = $db_passwd log4perl.appender.DBAppndr.sql = INSERT INTO log (level, ti +mestamp, method, line, message) VALUES (?,?,?,?,?) log4perl.appender.DBAppndr.params.1 = %p log4perl.appender.DBAppndr.params.2 = %d{yyyy-MM-dd HH:mm:ss.SSS +} log4perl.appender.DBAppndr.params.3 = %M log4perl.appender.DBAppndr.params.4 = %L log4perl.appender.DBAppndr.usePreparedStmt = 1 log4perl.appender.DBAppndr.layout = Log::Log4perl::Layou +t::NoopLayout log4perl.appender.DBAppndr.warp_message = $spr !; Log::Log4perl::init( \$conf );
This resulted in the unfortunate Can't use string ("Can't use string ("Data director"...) as a HASH ref while "strict refs" in use at /usr/local/share/perl/5.14.2/Log/Log4perl/Appender.pm line 281. I also have loggers to the screen and file, but the DBI one is the problem child, and while he's having a tantrum, the others don't even get to run. Obviously, things would work fine if I used sprintf myself at the caller level, but that defeats the purpose of having a nice clean logging statement. Any suggestions?

In reply to log4perl dbi appender argument formatting by quixadhal

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • Outside of code tags, you may need to use entities for some characters:
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?
    Username:
    Password:

    What's my password?
    Create A New User
    Chatterbox?
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others pondering the Monastery: (17)
    As of 2014-09-19 18:01 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      How do you remember the number of days in each month?











      Results (144 votes), past polls