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  1. or download this
    use strict;
use warnings;
...
$log->info("Logging initialized");
Log::Log4perl::MDC->put("MDC_key", "my MDC value");
$log->info("MDC used");
  2. or download this
    log4perl.rootLogger = TRACE, app_screen, app_db

...
log4perl.appender.app_db.warp_message = 0
log4perl.appender.app_db.attrs.f_encoding = utf8
log4perl.appender.app_db.layout =  Log::Log4perl::Layout::NoopLayout
  3. or download this
    Log4perl: DBI->prepare failed no such table: log
insert into log (priority, my_key, message) values (?, ?, ? ) at C:\Us
+ers\bloeckm\Perl\DB_logging\log4perl_dbi_demo.pl line 13.