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|
#!perl -w
use strict;
$|=1;
$^W=1;
my $calls = 0;
my %my_methods;
# =================================================
# Example code for sub classing the DBI.
#
# Note that the extra ::db and ::st classes must be set up
# as sub classes of the corresponding DBI classes.
#
# This whole mechanism is new and experimental - it may change!
package MyDBI;
@MyDBI::ISA = qw(DBI);
# the MyDBI::dr::connect method is NOT called!
# you can either override MyDBI::connect()
# or use MyDBI::db::connected()
package MyDBI::db;
@MyDBI::db::ISA = qw(DBI::db);
sub prepare {
my($dbh, @args) = @_;
++$my_methods{prepare};
++$calls;
my $sth = $dbh->SUPER::prepare(@args);
return $sth;
}
package MyDBI::st;
@MyDBI::st::ISA = qw(DBI::st);
sub fetch {
my($sth, @args) = @_;
++$my_methods{fetch};
++$calls;
# this is just to trigger (re)STORE on exit to test that the STORE
# doesn't clear any erro condition
local $sth->{Taint} = 0;
my $row = $sth->SUPER::fetch(@args);
if ($row) {
# modify fetched data as an example
$row->[1] = lc($row->[1]);
# also demonstrate calling set_err()
return $sth->set_err(1,"Don't be so negative",undef,"fetch")
if $row->[0] < 0;
# ... and providing alternate results
# (although typically would trap and hide and error from SUPER::fetch)
return $sth->set_err(2,"Don't exagerate",undef, undef, [ 42,"zz",0 ])
if $row->[0] > 42;
}
return $row;
}
# =================================================
package main;
use Test::More tests => 43;
BEGIN {
use_ok( 'DBI' );
}
my $tmp;
#DBI->trace(2);
my $dbh = MyDBI->connect("dbi:Sponge:foo","","", {
PrintError => 0,
RaiseError => 1,
CompatMode => 1, # just for clone test
});
isa_ok($dbh, 'MyDBI::db');
is($dbh->{CompatMode}, 1);
undef $dbh;
$dbh = DBI->connect("dbi:Sponge:foo","","", {
PrintError => 0,
RaiseError => 1,
RootClass => "MyDBI",
CompatMode => 1, # just for clone test
dbi_foo => 1, # just to help debugging clone etc
});
isa_ok( $dbh, 'MyDBI::db');
is($dbh->{CompatMode}, 1);
#$dbh->trace(5);
my $sth = $dbh->prepare("foo",
# data for DBD::Sponge to return via fetch
{ rows => [
[ 40, "AAA", 9 ],
[ 41, "BB", 8 ],
[ -1, "C", 7 ],
[ 49, "DD", 6 ]
],
}
);
is($calls, 1);
isa_ok($sth, 'MyDBI::st');
my $row = $sth->fetch;
is($calls, 2);
is($row->[1], "aaa");
$row = $sth->fetch;
is($calls, 3);
is($row->[1], "bb");
is($DBI::err, undef);
$row = eval { $sth->fetch };
my $eval_err = $@;
is(!defined $row, 1);
is(substr($eval_err,0,50), "DBD::Sponge::st fetch failed: Don't be so negative");
#$sth->trace(5);
#$sth->{PrintError} = 1;
$sth->{RaiseError} = 0;
$row = eval { $sth->fetch };
isa_ok($row, 'ARRAY');
is($row->[0], 42);
is($DBI::err, 2);
like($DBI::errstr, qr/Don't exagerate/);
is($@ =~ /Don't be so negative/, $@);
my $dbh2 = $dbh->clone;
isa_ok( $dbh2, 'MyDBI::db', "Clone A" );
is($dbh2 != $dbh, 1);
is($dbh2->{CompatMode}, 1);
my $dbh3 = $dbh->clone({});
isa_ok( $dbh3, 'MyDBI::db', 'Clone B' );
is($dbh3 != $dbh, 1);
is($dbh3 != $dbh2, 1);
isa_ok( $dbh3, 'MyDBI::db');
is($dbh3->{CompatMode}, 1);
my $dbh2c = $dbh2->clone;
isa_ok( $dbh2c, 'MyDBI::db', "Clone of clone A" );
is($dbh2c != $dbh2, 1);
is($dbh2c->{CompatMode}, 1);
my $dbh3c = $dbh3->clone({ CompatMode => 0 });
isa_ok( $dbh3c, 'MyDBI::db', 'Clone of clone B' );
is((grep { $dbh3c == $_ } $dbh, $dbh2, $dbh3), 0);
isa_ok( $dbh3c, 'MyDBI::db');
ok(!$dbh3c->{CompatMode});
$tmp = $dbh->sponge_test_installed_method('foo','bar');
isa_ok( $tmp, "ARRAY", "installed method" );
is_deeply( $tmp, [qw( foo bar )] );
$tmp = eval { $dbh->sponge_test_installed_method() };
is(!$tmp, 1);
is($dbh->err, 42);
is($dbh->errstr, "not enough parameters");
$dbh = eval { DBI->connect("dbi:Sponge:foo","","", {
RootClass => 'nonesuch1', PrintError => 0, RaiseError => 0, });
};
ok( !defined($dbh), "Failed connect #1" );
is(substr($@,0,25), "Can't locate nonesuch1.pm");
$dbh = eval { nonesuch2->connect("dbi:Sponge:foo","","", {
PrintError => 0, RaiseError => 0, });
};
ok( !defined($dbh), "Failed connect #2" );
is(substr($@,0,36), q{Can't locate object method "connect"});
print "@{[ %my_methods ]}\n";
1;
|
