1 package DBIx::Class::Version::Table;
2 use base 'DBIx::Class';
6 __PACKAGE__->load_components(qw/ Core/);
7 __PACKAGE__->table('SchemaVersions');
9 __PACKAGE__->add_columns
11 'data_type' => 'VARCHAR',
12 'is_auto_increment' => 0,
13 'default_value' => undef,
14 'is_foreign_key' => 0,
20 'data_type' => 'VARCHAR',
21 'is_auto_increment' => 0,
22 'default_value' => undef,
23 'is_foreign_key' => 0,
24 'name' => 'Installed',
29 __PACKAGE__->set_primary_key('Version');
31 package DBIx::Class::Version;
32 use base 'DBIx::Class::Schema';
36 __PACKAGE__->register_class('Table', 'DBIx::Class::Version::Table');
39 # ---------------------------------------------------------------------------
43 DBIx::Class::Schema::Versioned - DBIx::Class::Schema plugin for Schema upgrades
47 package Library::Schema;
48 use base qw/DBIx::Class::Schema/;
49 # load Library::Schema::CD, Library::Schema::Book, Library::Schema::DVD
50 __PACKAGE__->load_classes(qw/CD Book DVD/);
52 __PACKAGE__->load_components(qw/+DBIx::Class::Schema::Versioned/);
53 __PACKAGE__->upgrade_directory('/path/to/upgrades/');
54 __PACKAGE__->backup_directory('/path/to/backups/');
59 This module is a component designed to extend L<DBIx::Class::Schema>
60 classes, to enable them to upgrade to newer schema layouts. To use this
61 module, you need to have called C<create_ddl_dir> on your Schema to
62 create your upgrade files to include with your delivery.
64 A table called I<SchemaVersions> is created and maintained by the
65 module. This contains two fields, 'Version' and 'Installed', which
66 contain each VERSION of your Schema, and the date+time it was installed.
68 The actual upgrade is called manually by calling C<upgrade> on your
69 schema object. Code is run at connect time to determine whether an
70 upgrade is needed, if so, a warning "Versions out of sync" is
73 So you'll probably want to write a script which generates your DDLs and diffs
74 and another which executes the upgrade.
76 NB: At the moment, only SQLite and MySQL are supported. This is due to
77 spotty behaviour in the SQL::Translator producers, please help us by
82 =head2 upgrade_directory
84 Use this to set the directory your upgrade files are stored in.
86 =head2 backup_directory
88 Use this to set the directory you want your backups stored in.
92 package DBIx::Class::Schema::Versioned;
96 use base 'DBIx::Class';
100 __PACKAGE__->mk_classdata('_filedata');
101 __PACKAGE__->mk_classdata('upgrade_directory');
102 __PACKAGE__->mk_classdata('backup_directory');
103 __PACKAGE__->mk_classdata('do_backup');
104 __PACKAGE__->mk_classdata('do_diff_on_init');
106 =head2 schema_version
108 Returns the current schema class' $VERSION; does -not- use $schema->VERSION
109 since that varies in results depending on if version.pm is installed, and if
110 so the perl or XS versions. If you want this to change, bug the version.pm
111 author to make vpp and vxs behave the same.
117 my $class = ref($self)||$self;
121 $version = ${"${class}::VERSION"};
126 =head2 get_db_version
128 Returns the version that your database is currently at. This is determined by the values in the
129 SchemaVersions table that $self->upgrade writes to.
135 my ($self, $rs) = @_;
137 my $vtable = $self->{vschema}->resultset('Table');
138 return 0 unless ($self->_source_exists($vtable));
140 my $psearch = $vtable->search(undef,
142 { 'max' => 'Installed' },
144 as => ['maxinstall'],
146 my $pversion = $vtable->search({ Installed => $psearch->get_column('maxinstall'),
148 $pversion = $pversion->Version if($pversion);
154 my ($self, $rs) = @_;
157 $rs->search({ 1, 0 })->count;
159 return 0 if $@ || !defined $c;
166 This is an overwritable method which is called just before the upgrade, to
167 allow you to make a backup of the database. Per default this method attempts
168 to call C<< $self->storage->backup >>, to run the standard backup on each
171 This method should return the name of the backup file, if appropriate..
178 ## Make each ::DBI::Foo do this
179 $self->storage->backup($self->backup_directory());
182 # is this just a waste of time?
183 sub _create_db_to_schema_diff {
186 my %driver_to_db_map = (
190 my $db = $driver_to_db_map{$self->storage->dbh->{Driver}->{Name}};
192 print "Sorry, this is an unsupported DB\n";
196 require SQL::Translator;
197 require SQL::Translator::Diff;
199 my $db_tr = SQL::Translator->new({
202 parser_args => { dbh => $self->storage->dbh }
205 $db_tr->producer($db);
206 my $dbic_tr = SQL::Translator->new;
207 $dbic_tr->parser('SQL::Translator::Parser::DBIx::Class');
208 $dbic_tr = $self->storage->configure_sqlt($dbic_tr, $db);
209 $dbic_tr->data($self);
210 $dbic_tr->producer($db);
212 $db_tr->schema->name('db_schema');
213 $dbic_tr->schema->name('dbic_schema');
215 # is this really necessary?
216 foreach my $tr ($db_tr, $dbic_tr) {
217 my $data = $tr->data;
218 $tr->parser->($tr, $$data);
221 my $diff = SQL::Translator::Diff::schema_diff($db_tr->schema, $db,
222 $dbic_tr->schema, $db,
223 { ignore_constraint_names => 1, ignore_index_names => 1, caseopt => 1 });
225 my $filename = $self->ddl_filename(
227 $self->upgrade_directory,
228 $self->schema_version,
232 if(!open($file, ">$filename"))
234 $self->throw_exception("Can't open $filename for writing ($!)");
240 print "WARNING: There may be differences between your DB and your DBIC schema. Please review and if necessary run the SQL in $filename to sync your DB.\n";
245 Call this to attempt to upgrade your database from the version it is at to the version
246 this DBIC schema is at.
248 It requires an SQL diff file to exist in $schema->upgrade_directory, normally you will
249 have created this using $schema->create_ddl_dir.
256 my $db_version = $self->get_db_version();
259 unless ($db_version) {
260 # set version in SchemaVersions table, can't actually upgrade as we don 't know what version the DB is at
261 $self->_create_db_to_schema_diff() if ($self->do_diff_on_init);
263 # create versions table and version row
264 $self->{vschema}->deploy;
265 $self->_set_db_version;
269 # db and schema at same version. do nothing
270 if ($db_version eq $self->schema_version) {
271 print "Upgrade not necessary\n";
275 my $upgrade_file = $self->ddl_filename(
276 $self->storage->sqlt_type,
277 $self->upgrade_directory,
278 $self->schema_version,
282 unless (-f $upgrade_file) {
283 warn "Upgrade not possible, no upgrade file found ($upgrade_file), please create one\n";
287 # backup if necessary then apply upgrade
288 $self->_filedata($self->_read_sql_file($upgrade_file));
289 $self->backup() if($self->do_backup);
290 $self->txn_do(sub { $self->do_upgrade() });
292 # set row in SchemaVersions table
293 $self->_set_db_version;
296 sub _set_db_version {
299 my $vtable = $self->{vschema}->resultset('Table');
300 $vtable->create({ Version => $self->schema_version,
301 Installed => strftime("%Y-%m-%d %H:%M:%S", gmtime())
308 my $file = shift || return;
311 open $fh, "<$file" or warn("Can't open upgrade file, $file ($!)");
312 my @data = split(/[;\n]/, join('', <$fh>));
314 @data = grep { $_ && $_ !~ /^-- / } @data;
315 @data = grep { $_ !~ /^(BEGIN TRANACTION|COMMIT)/m } @data;
321 This is an overwritable method used to run your upgrade. The freeform method
322 allows you to run your upgrade any way you please, you can call C<run_upgrade>
323 any number of times to run the actual SQL commands, and in between you can
324 sandwich your data upgrading. For example, first run all the B<CREATE>
325 commands, then migrate your data from old to new tables/formats, then
326 issue the DROP commands when you are finished.
328 Will run the whole file as it is by default.
336 ## overridable sub, per default just run all the commands.
337 $self->run_upgrade(qr/create/i);
338 $self->run_upgrade(qr/alter table .*? add/i);
339 $self->run_upgrade(qr/alter table .*? (?!drop)/i);
340 $self->run_upgrade(qr/alter table .*? drop/i);
341 $self->run_upgrade(qr/drop/i);
346 $self->run_upgrade(qr/create/i);
348 Runs a set of SQL statements matching a passed in regular expression. The
349 idea is that this method can be called any number of times from your
350 C<upgrade> method, running whichever commands you specify via the
351 regex in the parameter. Probably won't work unless called from the overridable
358 my ($self, $stm) = @_;
360 return unless ($self->_filedata);
361 my @statements = grep { $_ =~ $stm } @{$self->_filedata};
362 $self->_filedata([ grep { $_ !~ /$stm/i } @{$self->_filedata} ]);
366 $self->storage->debugobj->query_start($_) if $self->storage->debug;
367 $self->storage->dbh->do($_) or warn "SQL was:\n $_";
368 $self->storage->debugobj->query_end($_) if $self->storage->debug;
376 $self->next::method(@_);
384 $self->{vschema} = DBIx::Class::Version->connect(@{$self->storage->connect_info()});
386 my $pversion = $self->get_db_version();
388 if($pversion eq $self->schema_version)
390 warn "This version is already installed\n";
396 warn "Your DB is currently unversioned. Please call upgrade on your schema to sync the DB.\n";
400 warn "Versions out of sync. This is " . $self->schema_version .
401 ", your database contains version $pversion, please call upgrade on your Schema.\n";
409 Jess Robinson <castaway@desert-island.demon.co.uk>
410 Luke Saunders <luke@shadowcatsystems.co.uk>
414 You may distribute this code under the same terms as Perl itself.