X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FDBIx%2FClass%2FSchema.pm;h=8f8d846ef790b994d041f2e848695f17c2197332;hb=096f421241;hp=1b55afa1b5771f2a89a16492656d99b48d097ec3;hpb=a3d931943f65be6b19d1ab743e60d8344a680676;p=dbsrgits%2FDBIx-Class.git diff --git a/lib/DBIx/Class/Schema.pm b/lib/DBIx/Class/Schema.pm index 1b55afa..8f8d846 100644 --- a/lib/DBIx/Class/Schema.pm +++ b/lib/DBIx/Class/Schema.pm @@ -3,15 +3,14 @@ package DBIx::Class::Schema; use strict; use warnings; -use Carp qw/croak/; -use UNIVERSAL::require; +use Carp::Clan qw/^DBIx::Class/; +use Scalar::Util qw/weaken/; use base qw/DBIx::Class/; -__PACKAGE__->load_components(qw/Exception/); __PACKAGE__->mk_classdata('class_mappings' => {}); __PACKAGE__->mk_classdata('source_registrations' => {}); -__PACKAGE__->mk_classdata('storage_type' => 'DBI'); +__PACKAGE__->mk_classdata('storage_type' => '::DBI'); __PACKAGE__->mk_classdata('storage'); =head1 NAME @@ -20,29 +19,30 @@ DBIx::Class::Schema - composable schemas =head1 SYNOPSIS - package My::Schema; + package Library::Schema; use base qw/DBIx::Class::Schema/; - - # load My::Schema::Foo, My::Schema::Bar, My::Schema::Baz - __PACKAGE__->load_classes(qw/Foo Bar Baz/); - package My::Schema::Foo; + # load Library::Schema::CD, Library::Schema::Book, Library::Schema::DVD + __PACKAGE__->load_classes(qw/CD Book DVD/); + + package Library::Schema::CD; use base qw/DBIx::Class/; - __PACKAGE__->load_components(qw/PK::Auto::Pg Core/); # for example - __PACKAGE__->table('foo'); + __PACKAGE__->load_components(qw/PK::Auto Core/); # for example + __PACKAGE__->table('cd'); - my $schema1 = My::Schema->connect( + # Elsewhere in your code: + my $schema1 = Library::Schema->connect( $dsn, $user, $password, - $attrs + { AutoCommit => 0 }, ); - my $schema2 = My::Schema->connect( ... ); + my $schema2 = Library::Schema->connect($coderef_returning_dbh); - # fetch objects using My::Schema::Foo - my $resultset = $schema1->resultset('Foo')->search( ... ); - my @objects = $schema2->resultset('Foo')->search( ... ); + # fetch objects using Library::Schema::DVD + my $resultset = $schema1->resultset('DVD')->search( ... ); + my @dvd_objects = $schema2->resultset('DVD')->search( ... ); =head1 DESCRIPTION @@ -51,16 +51,23 @@ use L and allows you to use more than one concurrent connection with your classes. NB: If you're used to L it's worth reading the L -carefully as DBIx::Class does things a little differently. Note in +carefully, as DBIx::Class does things a little differently. Note in particular which module inherits off which. =head1 METHODS -=head2 register_class +=head2 register_class + +=over 4 + +=item Arguments: $moniker, $component_class -Registers a class which isa ResultSourceInstance; equivalent to calling +=back - $schema->register_source($moniker, $class->result_source_instance); +Registers a class which isa DBIx::Class::ResultSourceProxy. Equivalent to +calling: + + $schema->register_source($moniker, $component_class->result_source_instance); =cut @@ -69,9 +76,16 @@ sub register_class { $self->register_source($moniker => $to_register->result_source_instance); } -=head2 register_source +=head2 register_source + +=over 4 + +=item Arguments: $moniker, $result_source -Registers the result source in the schema with the given moniker +=back + +Registers the L in the schema with the given +moniker. =cut @@ -81,18 +95,27 @@ sub register_source { $reg{$moniker} = $source; $self->source_registrations(\%reg); $source->schema($self); + weaken($source->{schema}) if ref($self); if ($source->result_class) { my %map = %{$self->class_mappings}; $map{$source->result_class} = $moniker; $self->class_mappings(\%map); } -} +} =head2 class - my $class = $schema->class('Foo'); +=over 4 + +=item Arguments: $moniker + +=item Return Value: $classname + +=back + +Retrieves the result class name for the given moniker. For example: -Retrieves the result class name for a given result source + my $class = $schema->class('CD'); =cut @@ -103,9 +126,17 @@ sub class { =head2 source - my $source = $schema->source('Foo'); +=over 4 -Returns the result source object for the registered name +=item Arguments: $moniker + +=item Return Value: $result_source + +=back + + my $source = $schema->source('Book'); + +Returns the L object for the registered moniker. =cut @@ -116,26 +147,47 @@ sub source { # if we got here, they probably passed a full class name my $mapped = $self->class_mappings->{$moniker}; - croak "Can't find source for ${moniker}" + $self->throw_exception("Can't find source for ${moniker}") unless $mapped && exists $sreg->{$mapped}; return $sreg->{$mapped}; } =head2 sources - my @source_monikers = $schema->sources; +=over 4 + +=item Return Value: @source_monikers -Returns the source monikers of all source registrations on this schema +=back + +Returns the source monikers of all source registrations on this schema. +For example: + + my @source_monikers = $schema->sources; =cut sub sources { return keys %{shift->source_registrations}; } +=head2 storage + + my $storage = $schema->storage; + +Returns the L object for this Schema. + =head2 resultset - my $rs = $schema->resultset('Foo'); +=over 4 + +=item Arguments: $moniker + +=item Return Value: $result_set -Returns the resultset for the registered moniker +=back + + my $rs = $schema->resultset('DVD'); + +Returns the L object for the registered moniker. =cut @@ -144,29 +196,46 @@ sub resultset { return $self->source($moniker)->resultset; } -=head2 load_classes [, (, ), { => []}] +=head2 load_classes + +=over 4 -Uses L to find all classes under the database class' namespace, -or uses the classes you select. Then it loads the component (using L), -and registers them (using B); +=item Arguments: @classes?, { $namespace => [ @classes ] }+ -It is possible to comment out classes with a leading '#', but note that perl -will think it's a mistake (trying to use a comment in a qw list) so you'll -need to add "no warnings 'qw';" before your load_classes call. +=back + +With no arguments, this method uses L to find all classes under +the schema's namespace. Otherwise, this method loads the classes you specify +(using L), and registers them (using L). + +It is possible to comment out classes with a leading C<#>, but note that perl +will think it's a mistake (trying to use a comment in a qw list), so you'll +need to add C before your load_classes call. + +Example: + + My::Schema->load_classes(); # loads My::Schema::CD, My::Schema::Artist, + # etc. (anything under the My::Schema namespace) + + # loads My::Schema::CD, My::Schema::Artist, Other::Namespace::Producer but + # not Other::Namespace::LinerNotes nor My::Schema::Track + My::Schema->load_classes(qw/ CD Artist #Track /, { + Other::Namespace => [qw/ Producer #LinerNotes /], + }); =cut sub load_classes { my ($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') { @@ -185,53 +254,94 @@ sub load_classes { } } else { eval "require Module::Find;"; - $class->throw("No arguments to load_classes and couldn't load". - " Module::Find ($@)") if $@; - my @comp = map { substr $_, length "${class}::" } Module::Find::findallmod($class); + $class->throw_exception( + "No arguments to load_classes and couldn't load Module::Find ($@)" + ) if $@; + my @comp = map { substr $_, length "${class}::" } + Module::Find::findallmod($class); $comps_for{$class} = \@comp; } - foreach my $prefix (keys %comps_for) { - foreach my $comp (@{$comps_for{$prefix}||[]}) { - my $comp_class = "${prefix}::${comp}"; - eval "use $comp_class"; # If it fails, assume the user fixed it - if ($@) { - die $@ unless $@ =~ /Can't locate/; + my @to_register; + { + no warnings qw/redefine/; + local *Class::C3::reinitialize = sub { }; + foreach my $prefix (keys %comps_for) { + foreach my $comp (@{$comps_for{$prefix}||[]}) { + my $comp_class = "${prefix}::${comp}"; + { # try to untaint module name. mods where this fails + # are left alone so we don't have to change the old behavior + no locale; # localized \w doesn't untaint expression + if ( $comp_class =~ m/^( (?:\w+::)* \w+ )$/x ) { + $comp_class = $1; + } + } + $class->ensure_class_loaded($comp_class); + $comp_class->source_name($comp) unless $comp_class->source_name; + + push(@to_register, [ $comp_class->source_name, $comp_class ]); } - $class->register_class($comp => $comp_class); } } + Class::C3->reinitialize; + + foreach my $to (@to_register) { + $class->register_class(@$to); + # if $class->can('result_source_instance'); + } } -=head2 compose_connection <@db_info> +=head2 compose_connection + +=over 4 -This is the most important method in this class. it takes a target namespace, -as well as dbh connection info, and creates a L class as -well as subclasses for each of your database classes in this namespace, using -this connection. +=item Arguments: $target_namespace, @db_info -It will also setup a ->class method on the target class, which lets you -resolve database classes based on the schema component name, for example +=item Return Value: $new_schema - MyApp::DB->class('Foo') # returns MyApp::DB::Foo, - # which ISA MyApp::Schema::Foo +=back -This is the recommended API for accessing Schema generated classes, and -using it might give you instant advantages with future versions of DBIC. +Calls L to the target namespace, +calls L with @db_info on the new schema, +then injects the L component and a +resultset_instance classdata entry on all the new classes, in order to support +$target_namespaces::$class->search(...) method calls. -WARNING: Loading components into Schema classes after compose_connection -may not cause them to be seen by the classes in your target namespace due -to the dispatch table approach used by Class::C3. If you do this you may find -you need to call Class::C3->reinitialize() afterwards to get the behaviour -you expect. +This is primarily useful when you have a specific need for class method access +to a connection. In normal usage it is preferred to call +L and use the resulting schema object to operate +on L objects with L for +more information. =cut sub compose_connection { my ($self, $target, @info) = @_; - my $base = 'DBIx::Class::ResultSetInstance'; - $base->require; + my $base = 'DBIx::Class::ResultSetProxy'; + eval "require ${base};"; + $self->throw_exception + ("No arguments to load_classes and couldn't load ${base} ($@)") + if $@; + + if ($self eq $target) { + # Pathological case, largely caused by the docs on early C::M::DBIC::Plain + foreach my $moniker ($self->sources) { + my $source = $self->source($moniker); + my $class = $source->result_class; + $self->inject_base($class, $base); + $class->mk_classdata(resultset_instance => $source->resultset); + $class->mk_classdata(class_resolver => $self); + } + $self->connection(@info); + return $self; + } + my $schema = $self->compose_namespace($target, $base); + { + no strict 'refs'; + *{"${target}::schema"} = sub { $schema }; + } + $schema->connection(@info); foreach my $moniker ($schema->sources) { my $source = $schema->source($moniker); @@ -244,24 +354,62 @@ sub compose_connection { return $schema; } +=head2 compose_namespace + +=over 4 + +=item Arguments: $target_namespace, $additional_base_class? + +=item Return Value: $new_schema + +=back + +For each L in the schema, this method creates a +class in the target namespace (e.g. $target_namespace::CD, +$target_namespace::Artist) that inherits from the corresponding classes +attached to the current schema. + +It also attaches a corresponding L object to the +new $schema object. If C<$additional_base_class> is given, the new composed +classes will inherit from first the corresponding classe from the current +schema then the base class. + +For example, for a schema with My::Schema::CD and My::Schema::Artist classes, + + $schema->compose_namespace('My::DB', 'Base::Class'); + print join (', ', @My::DB::CD::ISA) . "\n"; + print join (', ', @My::DB::Artist::ISA) ."\n"; + +will produce the output + + My::Schema::CD, Base::Class + My::Schema::Artist, Base::Class + +=cut + sub compose_namespace { my ($self, $target, $base) = @_; my %reg = %{ $self->source_registrations }; my %target; my %map; my $schema = $self->clone; - foreach my $moniker ($schema->sources) { - my $source = $schema->source($moniker); - my $target_class = "${target}::${moniker}"; - $self->inject_base( - $target_class => $source->result_class, ($base ? $base : ()) - ); - $source->result_class($target_class); + { + no warnings qw/redefine/; + local *Class::C3::reinitialize = sub { }; + foreach my $moniker ($schema->sources) { + my $source = $schema->source($moniker); + my $target_class = "${target}::${moniker}"; + $self->inject_base( + $target_class => $source->result_class, ($base ? $base : ()) + ); + $source->result_class($target_class); + $target_class->result_source_instance($source) + if $target_class->can('result_source_instance'); + } } + Class::C3->reinitialize(); { no strict 'refs'; - *{"${target}::schema"} = - sub { $schema }; foreach my $meth (qw/class source resultset/) { *{"${target}::${meth}"} = sub { shift->schema->$meth(@_) }; @@ -270,10 +418,16 @@ sub compose_namespace { return $schema; } -=head2 setup_connection_class <$target> <@info> +=head2 setup_connection_class + +=over 4 + +=item Arguments: $target, @info -Sets up a database connection class to inject between the schema -and the subclasses the schema creates. +=back + +Sets up a database connection class to inject between the schema and the +subclasses that the schema creates. =cut @@ -284,34 +438,219 @@ sub setup_connection_class { $target->connection(@info); } -=head2 connection(@args) +=head2 storage_type + +=over 4 + +=item Arguments: $storage_type + +=item Return Value: $storage_type + +=back + +Set the storage class that will be instantiated when L is called. +If the classname starts with C<::>, the prefix C is +assumed by L. Defaults to C<::DBI>, +which is L. + +You want to use this to hardcoded subclasses of L +in cases where the appropriate subclass is not autodetected, such as when +dealing with MSSQL via L, in which case you'd set it to +C<::DBI::Sybase::MSSQL>. + +=head2 connection + +=over 4 + +=item Arguments: @args + +=item Return Value: $new_schema -Instantiates a new Storage object of type storage_type and passes the -arguments to $storage->connection_info. Sets the connection in-place on -the schema. +=back + +Instantiates a new Storage object of type +L and passes the arguments to +$storage->connect_info. Sets the connection in-place on the schema. See +L for more information. =cut sub connection { my ($self, @info) = @_; - my $storage_class = 'DBIx::Class::Storage::'.$self->storage_type; - $storage_class->require; + return $self if !@info && $self->storage; + my $storage_class = $self->storage_type; + $storage_class = 'DBIx::Class::Storage'.$storage_class + if $storage_class =~ m/^::/; + eval "require ${storage_class};"; + $self->throw_exception( + "No arguments to load_classes and couldn't load ${storage_class} ($@)" + ) if $@; my $storage = $storage_class->new; $storage->connect_info(\@info); $self->storage($storage); return $self; } -=head2 connect(@info) +=head2 connect + +=over 4 + +=item Arguments: @info -Conveneience method, equivalent to $schema->clone->connection(@info) +=item Return Value: $new_schema + +=back + +This is a convenience method. It is equivalent to calling +$schema->clone->connection(@info). See L and L for more +information. =cut -sub connect { shift->clone->connection(@_) }; +sub connect { shift->clone->connection(@_) } + +=head2 txn_begin + +Begins a transaction (does nothing if AutoCommit is off). Equivalent to +calling $schema->storage->txn_begin. See +L for more information. + +=cut + +sub txn_begin { shift->storage->txn_begin } + +=head2 txn_commit + +Commits the current transaction. Equivalent to calling +$schema->storage->txn_commit. See L +for more information. + +=cut + +sub txn_commit { shift->storage->txn_commit } + +=head2 txn_rollback + +Rolls back the current transaction. Equivalent to calling +$schema->storage->txn_rollback. See +L for more information. + +=cut + +sub txn_rollback { shift->storage->txn_rollback } + +=head2 txn_do + +=over 4 + +=item Arguments: C<$coderef>, @coderef_args? + +=item Return Value: The return value of $coderef + +=back + +Executes C<$coderef> with (optional) arguments C<@coderef_args> atomically, +returning its result (if any). If an exception is caught, a rollback is issued +and the exception is rethrown. If the rollback fails, (i.e. throws an +exception) an exception is thrown that includes a "Rollback failed" message. + +For example, + + my $author_rs = $schema->resultset('Author')->find(1); + my @titles = qw/Night Day It/; + + my $coderef = sub { + # If any one of these fails, the entire transaction fails + $author_rs->create_related('books', { + title => $_ + }) foreach (@titles); + + return $author->books; + }; + + my $rs; + eval { + $rs = $schema->txn_do($coderef); + }; + + 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 +the outermost transaction will issue a L on +the Schema's storage, and txn_do() can be called in void, scalar and list +context and it will behave as expected. + +=cut + +sub txn_do { + my ($self, $coderef, @args) = @_; + + $self->storage or $self->throw_exception + ('txn_do called on $schema without storage'); + ref $coderef eq 'CODE' or $self->throw_exception + ('$coderef must be a CODE reference'); + + my (@return_values, $return_value); + + $self->txn_begin; # If this throws an exception, no rollback is needed + + my $wantarray = wantarray; # Need to save this since the context + # inside the eval{} block is independent + # of the context that called txn_do() + eval { + + # Need to differentiate between scalar/list context to allow for + # returning a list in scalar context to get the size of the list + if ($wantarray) { + # list context + @return_values = $coderef->(@args); + } elsif (defined $wantarray) { + # scalar context + $return_value = $coderef->(@args); + } else { + # void context + $coderef->(@args); + } + $self->txn_commit; + }; + + if ($@) { + my $error = $@; + + eval { + $self->txn_rollback; + }; + + if ($@) { + my $rollback_error = $@; + my $exception_class = "DBIx::Class::Storage::NESTED_ROLLBACK_EXCEPTION"; + $self->throw_exception($error) # propagate nested rollback + if $rollback_error =~ /$exception_class/; + + $self->throw_exception( + "Transaction aborted: $error. Rollback failed: ${rollback_error}" + ); + } else { + $self->throw_exception($error); # txn failed but rollback succeeded + } + } + + return $wantarray ? @return_values : $return_value; +} =head2 clone +=over 4 + +=item Return Value: $new_schema + +=back + Clones the schema and its associated result_source objects and returns the copy. @@ -319,7 +658,9 @@ copy. sub clone { my ($self) = @_; - my $clone = bless({ (ref $self ? %$self : ()) }, ref $self || $self); + my $clone = { (ref $self ? %$self : ()) }; + bless $clone, (ref $self || $self); + foreach my $moniker ($self->sources) { my $source = $self->source($moniker); my $new = $source->new($source); @@ -328,6 +669,131 @@ sub clone { return $clone; } +=head2 populate + +=over 4 + +=item Arguments: $source_name, \@data; + +=back + +Pass this method a resultsource name, and an arrayref of +arrayrefs. The arrayrefs should contain a list of column names, +followed by one or many sets of matching data for the given columns. + +Each set of data is inserted into the database using +L, and a arrayref of the resulting row +objects is returned. + +i.e., + + $schema->populate('Artist', [ + [ qw/artistid name/ ], + [ 1, 'Popular Band' ], + [ 2, 'Indie Band' ], + ... + ]); + +=cut + +sub populate { + my ($self, $name, $data) = @_; + my $rs = $self->resultset($name); + my @names = @{shift(@$data)}; + my @created; + foreach my $item (@$data) { + my %create; + @create{@names} = @$item; + push(@created, $rs->create(\%create)); + } + return @created; +} + +=head2 throw_exception + +=over 4 + +=item Arguments: $message + +=back + +Throws an exception. Defaults to using L to report errors from +user's perspective. + +=cut + +sub throw_exception { + my ($self) = shift; + croak @_; +} + +=head2 deploy (EXPERIMENTAL) + +=over 4 + +=item Arguments: $sqlt_args, $dir + +=back + +Attempts to deploy the schema to the current storage using L. + +Note that this feature is currently EXPERIMENTAL and may not work correctly +across all databases, or fully handle complex relationships. + +See L for a list of values for C<$sqlt_args>. The most +common value for this would be C<< { add_drop_table => 1, } >> to have the SQL +produced include a DROP TABLE statement for each table created. + +=cut + +sub deploy { + my ($self, $sqltargs, $dir) = @_; + $self->throw_exception("Can't deploy without storage") unless $self->storage; + $self->storage->deploy($self, undef, $sqltargs, $dir); +} + +=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, @_); +} + +=head2 ddl_filename (EXPERIMENTAL) + + my $filename = $table->ddl_filename($type, $dir, $version) + +Creates a filename for a SQL file based on the table class name. Not +intended for direct end user use. + +=cut + +sub ddl_filename { + my ($self, $type, $dir, $version) = @_; + + my $filename = ref($self); + $filename =~ s/::/-/; + $filename = "$dir$filename-$version-$type.sql"; + + return $filename; +} + 1; =head1 AUTHORS @@ -339,4 +805,3 @@ Matt S. Trout You may distribute this code under the same terms as Perl itself. =cut -