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{
package DBD::NullP;
require DBI;
require Carp;
@EXPORT = qw(); # Do NOT @EXPORT anything.
$VERSION = sprintf("12.%06d", q$Revision: 14714 $ =~ /(\d+)/o);
# $Id: NullP.pm 14714 2011-02-22 17:27:07Z Tim $
#
# Copyright (c) 1994-2007 Tim Bunce
#
# You may distribute under the terms of either the GNU General Public
# License or the Artistic License, as specified in the Perl README file.
$drh = undef; # holds driver handle once initialised
sub driver{
return $drh if $drh;
my($class, $attr) = @_;
$class .= "::dr";
($drh) = DBI::_new_drh($class, {
'Name' => 'NullP',
'Version' => $VERSION,
'Attribution' => 'DBD Example Null Perl stub by Tim Bunce',
}, [ qw'example implementors private data']);
$drh;
}
sub CLONE {
undef $drh;
}
}
{ package DBD::NullP::dr; # ====== DRIVER ======
$imp_data_size = 0;
use strict;
sub connect { # normally overridden, but a handy default
my $dbh = shift->SUPER::connect(@_)
or return;
$dbh->STORE(Active => 1);
$dbh;
}
sub DESTROY { undef }
}
{ package DBD::NullP::db; # ====== DATABASE ======
$imp_data_size = 0;
use strict;
use Carp qw(croak);
sub prepare {
my ($dbh, $statement)= @_;
my ($outer, $sth) = DBI::_new_sth($dbh, {
'Statement' => $statement,
});
return $outer;
}
sub FETCH {
my ($dbh, $attrib) = @_;
# In reality this would interrogate the database engine to
# either return dynamic values that cannot be precomputed
# or fetch and cache attribute values too expensive to prefetch.
return $dbh->SUPER::FETCH($attrib);
}
sub STORE {
my ($dbh, $attrib, $value) = @_;
# would normally validate and only store known attributes
# else pass up to DBI to handle
if ($attrib eq 'AutoCommit') {
Carp::croak("Can't disable AutoCommit") unless $value;
# convert AutoCommit values to magic ones to let DBI
# know that the driver has 'handled' the AutoCommit attribute
$value = ($value) ? -901 : -900;
}
return $dbh->SUPER::STORE($attrib, $value);
}
sub ping { 1 }
sub disconnect {
shift->STORE(Active => 0);
}
}
{ package DBD::NullP::st; # ====== STATEMENT ======
$imp_data_size = 0;
use strict;
sub bind_param {
my ($sth, $param, $value, $attr) = @_;
$sth->{ParamValues}{$param} = $value;
$sth->{ParamAttr}{$param} = $attr
if defined $attr; # attr is sticky if not explicitly set
return 1;
}
sub execute {
my $sth = shift;
$sth->bind_param($_, $_[$_-1]) for (1..@_);
if ($sth->{Statement} =~ m/^ \s* SELECT \s+/xmsi) {
$sth->STORE(NUM_OF_FIELDS => 1);
$sth->{NAME} = [ "fieldname" ];
# just for the sake of returning something, we return the params
my $params = $sth->{ParamValues} || {};
$sth->{dbd_nullp_data} = [ @{$params}{ sort keys %$params } ];
$sth->STORE(Active => 1);
}
# force a sleep - handy for testing
elsif ($sth->{Statement} =~ m/^ \s* SLEEP \s+ (\S+) /xmsi) {
my $secs = $1;
if (eval { require Time::HiRes; defined &Time::HiRes::sleep }) {
Time::HiRes::sleep($secs);
}
else {
sleep $secs;
}
}
# force an error - handy for testing
elsif ($sth->{Statement} =~ m/^ \s* ERROR \s+ (\d+) \s* (.*) /xmsi) {
return $sth->set_err($1, $2);
}
# anything else is silently ignored, sucessfully
1;
}
sub fetchrow_arrayref {
my $sth = shift;
my $data = $sth->{dbd_nullp_data};
if (!$data || !@$data) {
$sth->finish; # no more data so finish
return undef;
}
return $sth->_set_fbav(shift @$data);
}
*fetch = \&fetchrow_arrayref; # alias
sub FETCH {
my ($sth, $attrib) = @_;
# would normally validate and only fetch known attributes
# else pass up to DBI to handle
return $sth->SUPER::FETCH($attrib);
}
sub STORE {
my ($sth, $attrib, $value) = @_;
# would normally validate and only store known attributes
# else pass up to DBI to handle
return $sth->SUPER::STORE($attrib, $value);
}
}
1;