my $genus = $schema->resultset('Genus')->find(12);
+ my $coderef2 = sub {
+ $genus->extinct(1);
+ $genus->update;
+ };
+
my $coderef1 = sub {
$genus->add_to_species({ name => 'troglodyte' });
$genus->wings(2);
$genus->update;
- $schema->txn_do($code, $genus); # Can have a nested transaction
+ $schema->txn_do($coderef2); # Can have a nested transaction
return $genus->species;
};
- my $coderef2 = sub {
- my ($genus) = @_;
- $genus->extinct(1);
- $genus->update;
- };
-
my $rs;
eval {
- $rs = $schema->txn_do($coderef1, $schema, $genus, $coderef2);
+ $rs = $schema->txn_do($coderef1);
};
if ($@) { # Transaction failed
This can be useful when you don't want to pass around a Schema object to every
method.
+=head2 Profiling
+
+When you enable L<DBIx::Class::Storage::DBI>'s debugging it prints the SQL
+executed as well as notifications of query completion and transaction
+begin/commit. If you'd like to profile the SQL you can subclass the
+L<DBIx::Class::Storage::Statistics> class and write your own profiling
+mechanism:
+
+ package My::Profiler;
+ use strict;
+
+ use base 'DBIx::Class::Storage::Statistics';
+
+ use Time::HiRes qw(time);
+
+ my $start;
+
+ sub query_start {
+ my $self = shift();
+ my $sql = shift();
+ my $params = @_;
+
+ print "Executing $sql: ".join(', ', @params)."\n";
+ $start = time();
+ }
+
+ sub query_end {
+ my $self = shift();
+ my $sql = shift();
+ my @params = @_;
+
+ printf("Execution took %0.4f seconds.\n", time() - $start);
+ $start = undef;
+ }
+
+ 1;
+
+You can then install that class as the debugging object:
+
+ __PACKAGE__->storage()->debugobj(new My::Profiler());
+ __PACKAGE__->storage()->debug(1);
+
+A more complicated example might involve storing each execution of SQL in an
+array:
+
+ sub query_end {
+ my $self = shift();
+ my $sql = shift();
+ my @params = @_;
+
+ my $elapsed = time() - $start;
+ push(@{ $calls{$sql} }, {
+ params => \@params,
+ elapsed => $elapsed
+ });
+ }
+
+You could then create average, high and low execution times for an SQL
+statement and dig down to see if certain parameters cause aberrant behavior.
+
=head2 Getting the value of the primary key for the last database insert
AKA getting last_insert_id
package Library::Schema;
use base qw/DBIx::Class::Schema/;
-
+
# load Library::Schema::CD, Library::Schema::Book, Library::Schema::DVD
__PACKAGE__->load_classes(qw/CD Book DVD/);
$password,
{ AutoCommit => 0 },
);
-
+
my $schema2 = Library::Schema->connect($coderef_returning_dbh);
# fetch objects using Library::Schema::DVD
sub load_classes {
my ($class, @params) = @_;
-
+
my %comps_for;
-
+
if (@params) {
foreach my $param (@params) {
if (ref $param eq 'ARRAY') {
# filter out commented entries
my @modules = grep { $_ !~ /^#/ } @$param;
-
+
push (@{$comps_for{$class}}, @modules);
}
elsif (ref $param eq 'HASH') {
foreach my $prefix (keys %comps_for) {
foreach my $comp (@{$comps_for{$prefix}||[]}) {
my $comp_class = "${prefix}::${comp}";
- eval "use $comp_class"; # If it fails, assume the user fixed it
- if ($@) {
- $comp_class =~ s/::/\//g;
- die $@ unless $@ =~ /Can't locate.+$comp_class\.pm\sin\s\@INC/;
- warn $@ if $@;
- }
- push(@to_register, [ $comp, $comp_class ]);
+ $class->ensure_class_loaded($comp_class);
+ $comp_class->source_name($comp) unless $comp_class->source_name;
+
+ push(@to_register, [ $comp_class->source_name, $comp_class ]);
}
}
}
For example,
my $author_rs = $schema->resultset('Author')->find(1);
+ my @titles = qw/Night Day It/;
my $coderef = sub {
- my ($author, @titles) = @_;
-
# If any one of these fails, the entire transaction fails
- $author->create_related('books', {
+ $author_rs->create_related('books', {
title => $_
}) foreach (@titles);
my $rs;
eval {
- $rs = $schema->txn_do($coderef, $author_rs, qw/Night Day It/);
+ $rs = $schema->txn_do($coderef);
};
- if ($@) {
- my $error = $@;
- if ($error =~ /Rollback failed/) {
- die "something terrible has happened!";
- } else {
- deal_with_failed_transaction();
- }
+ if ($@) { # Transaction failed
+ die "something terrible has happened!" #
+ if ($@ =~ /Rollback failed/); # Rollback failed
+
+ deal_with_failed_transaction();
}
In a nested transaction (calling txn_do() from within a txn_do() coderef) only
$self->storage->deploy($self, undef, $sqltargs);
}
+=head2 create_ddl_dir (EXPERIMENTAL)
+
+=over 4
+
+=item Arguments: \@databases, $version, $directory, $sqlt_args
+
+=back
+
+Creates an SQL file based on the Schema, for each of the specified
+database types, in the given directory.
+
+Note that this feature is currently EXPERIMENTAL and may not work correctly
+across all databases, or fully handle complex relationships.
+
+=cut
+
+sub create_ddl_dir
+{
+ my $self = shift;
+
+ $self->throw_exception("Can't create_ddl_dir without storage") unless $self->storage;
+ $self->storage->create_ddl_dir($self, @_);
+}
+
+sub ddl_filename
+{
+ my ($self, $type, $dir, $version) = @_;
+
+ my $filename = ref($self);
+ $filename =~ s/^.*:://;
+ $filename = "$dir$filename-$version-$type.sql";
+
+ return $filename;
+}
+
1;
=head1 AUTHORS
projects / dbsrgits/DBIx-Class-Historic.git / commitdiff