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Re: Can DBI modify queries on the fly?

by kyle (Abbot)
on Oct 14, 2009 at 18:41 UTC ( #801169=note: print w/ replies, xml ) Need Help??

in reply to Can DBI modify queries on the fly?

Here's a solution that doesn't use the callback mechanism, so it works with older versions of DBI. To use it, give it as the RootClass to DBI->connect. Since we were already using DBIx::ContextualFetch there, the code below uses that as its base, but it's not otherwise required.

package My::DatabaseRoot; use strict; use warnings; use base 'DBIx::ContextualFetch'; package My::DatabaseRoot::db; use base 'DBIx::ContextualFetch::db'; sub _rewrite { return $_[0] if ! defined $_[0]; return $_[0] if $_[0] =~ m{ COMPANY \s DEBUGGING \s INFO }xms; my $new_req = shift @_; # Add a newline, if there isn't one. $new_req =~ s{ ([^\n]) \z }{$1\n}xms; $new_req .= "/* COMPANY DEBUGGING INFO\n"; my $frame_num = 1; while ( my @frame_info = caller( $frame_num++ ) ) { $new_req .= "$frame_num. $frame_info[0]\::$frame_info[3] ($fra +me_info[1], line $frame_info[2])\n"; } $new_req .= "*/\n"; return $new_req; } my @methods = qw( do prepare prepare_cached selectrow_array selectrow_arrayref selectrow_hashref selectall_arrayref selectall_hashref selectcol_arrayref ); foreach my $method_name ( @methods ) { my $method = $method_name; no strict 'refs'; *{ __PACKAGE__ . "::$method" } = sub { my $self = shift @_; my $sql = _rewrite( shift @_ ); return $self->${ \"SUPER::$method" }( $sql, @_ ); }; } package LT::DatabaseRoot::st; use base 'DBIx::ContextualFetch::st'; 1; __END__ =pod =head1 NAME My::DatabaseRoot -- A class between the application and database =head1 SYNOPSIS DBI->connect( $dsn, $user, $pass, { RootClass => 'My::DatabaseRoot' } ); =head1 DESCRIPTION The purpose of My::DatabaseRoot is to get between the application and the database. Anything we want to do with our DBI access on a global basis can be added here. =head1 AUTHOR Kyle Hasselbacher =cut

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