1 package # Hide from PAUSE
2 DBIx::Class::Version::Table;
3 use base 'DBIx::Class';
7 __PACKAGE__->load_components(qw/ Core/);
8 __PACKAGE__->table('dbix_class_schema_versions');
10 __PACKAGE__->add_columns
12 'data_type' => 'VARCHAR',
13 'is_auto_increment' => 0,
14 'default_value' => undef,
15 'is_foreign_key' => 0,
21 'data_type' => 'VARCHAR',
22 'is_auto_increment' => 0,
23 'default_value' => undef,
24 'is_foreign_key' => 0,
25 'name' => 'installed',
30 __PACKAGE__->set_primary_key('version');
32 package # Hide from PAUSE
33 DBIx::Class::Version::TableCompat;
34 use base 'DBIx::Class';
35 __PACKAGE__->load_components(qw/ Core/);
36 __PACKAGE__->table('SchemaVersions');
38 __PACKAGE__->add_columns
40 'data_type' => 'VARCHAR',
43 'data_type' => 'VARCHAR',
46 __PACKAGE__->set_primary_key('Version');
48 package # Hide from PAUSE
50 use base 'DBIx::Class::Schema';
54 __PACKAGE__->register_class('Table', 'DBIx::Class::Version::Table');
56 package # Hide from PAUSE
57 DBIx::Class::VersionCompat;
58 use base 'DBIx::Class::Schema';
62 __PACKAGE__->register_class('TableCompat', 'DBIx::Class::Version::TableCompat');
65 # ---------------------------------------------------------------------------
69 DBIx::Class::Schema::Versioned - DBIx::Class::Schema plugin for Schema upgrades
73 package Library::Schema;
74 use base qw/DBIx::Class::Schema/;
78 # load Library::Schema::CD, Library::Schema::Book, Library::Schema::DVD
79 __PACKAGE__->load_classes(qw/CD Book DVD/);
81 __PACKAGE__->load_components(qw/Schema::Versioned/);
82 __PACKAGE__->upgrade_directory('/path/to/upgrades/');
87 This module provides methods to apply DDL changes to your database using SQL
88 diff files. Normally these diff files would be created using
89 L<DBIx::Class::Schema/create_ddl_dir>.
91 A table called I<dbix_class_schema_versions> is created and maintained by the
92 module. This is used to determine which version your database is currently at.
93 Similarly the $VERSION in your DBIC schema class is used to determine the
94 current DBIC schema version.
96 The upgrade is initiated manually by calling C<upgrade> on your schema object,
97 this will attempt to upgrade the database from its current version to the current
98 schema version using a diff from your I<upgrade_directory>. If a suitable diff is
99 not found then no upgrade is possible.
101 NB: At the moment, only SQLite and MySQL are supported. This is due to
102 spotty behaviour in the SQL::Translator producers, please help us by
103 enhancing them. Ask on the mailing list or IRC channel for details (community details
106 =head1 GETTING STARTED
108 Firstly you need to setup your schema class as per the L</SYNOPSIS>, make sure
109 you have specified an upgrade_directory and an initial $VERSION.
111 Then you'll need two scripts, one to create DDL files and diffs and another to perform
112 upgrades. Your creation script might look like a bit like this:
119 my ( $preversion, $help );
121 'p|preversion:s' => \$preversion,
124 my $schema = MyApp::Schema->connect(
129 my $sql_dir = './sql';
130 my $version = $schema->schema_version();
131 $schema->create_ddl_dir( 'MySQL', $version, $sql_dir, $preversion );
133 Then your upgrade script might look like so:
138 my $schema = MyApp::Schema->connect(
144 if (!$schema->get_db_version()) {
145 # schema is unversioned
151 The script above assumes that if the database is unversioned then it is empty
152 and we can safely deploy the DDL to it. However things are not always so simple.
154 if you want to initialise a pre-existing database where the DDL is not the same
155 as the DDL for your current schema version then you will need a diff which
156 converts the database's DDL to the current DDL. The best way to do this is
157 to get a dump of the database schema (without data) and save that in your
158 SQL directory as version 0.000 (the filename must be as with
159 L<DBIx::Class::Schema/ddl_filename>) then create a diff using your create DDL
160 script given above from version 0.000 to the current version. Then hand check
161 and if necessary edit the resulting diff to ensure that it will apply. Once you have
162 done all that you can do this:
164 if (!$schema->get_db_version()) {
165 # schema is unversioned
166 $schema->install("0.000");
169 # this will now apply the 0.000 to current version diff
172 In the case of an unversioned database the above code will create the
173 dbix_class_schema_versions table and write version 0.000 to it, then
174 upgrade will then apply the diff we talked about creating in the previous paragraph
175 and then you're good to go.
179 package DBIx::Class::Schema::Versioned;
183 use base 'DBIx::Class';
184 use POSIX 'strftime';
187 __PACKAGE__->mk_classdata('_filedata');
188 __PACKAGE__->mk_classdata('upgrade_directory');
189 __PACKAGE__->mk_classdata('backup_directory');
190 __PACKAGE__->mk_classdata('do_backup');
191 __PACKAGE__->mk_classdata('do_diff_on_init');
196 =head2 upgrade_directory
198 Use this to set the directory your upgrade files are stored in.
200 =head2 backup_directory
202 Use this to set the directory you want your backups stored in (note that backups
203 are disabled by default).
211 =item Arguments: $db_version
215 Call this to initialise a previously unversioned database. The table 'dbix_class_schema_versions' will be created which will be used to store the database version.
217 Takes one argument which should be the version that the database is currently at. Defaults to the return value of L</schema_version>.
219 See L</getting_started> for more details.
225 my ($self, $new_version) = @_;
227 # must be called on a fresh database
228 if ($self->get_db_version()) {
229 warn 'Install not possible as versions table already exists in database';
232 # default to current version if none passed
233 $new_version ||= $self->schema_version();
236 # create versions table and version row
237 $self->{vschema}->deploy;
238 $self->_set_db_version;
244 Same as L<DBIx::Class::Schema/deploy> but also calls C<install>.
250 $self->next::method(@_);
256 Call this to attempt to upgrade your database from the version it is at to the version
257 this DBIC schema is at. If they are the same it does nothing.
259 It requires an SQL diff file to exist in you I<upgrade_directory>, normally you will
260 have created this using L<DBIx::Class::Schema/create_ddl_dir>.
262 If successful the dbix_class_schema_versions table is updated with the current
270 my $db_version = $self->get_db_version();
273 unless ($db_version) {
274 warn 'Upgrade not possible as database is unversioned. Please call install first.';
278 # db and schema at same version. do nothing
279 if ($db_version eq $self->schema_version) {
280 print "Upgrade not necessary\n";
284 # strangely the first time this is called can
285 # differ to subsequent times. so we call it
288 $self->storage->sqlt_type;
290 my $upgrade_file = $self->ddl_filename(
291 $self->storage->sqlt_type,
292 $self->schema_version,
293 $self->upgrade_directory,
297 unless (-f $upgrade_file) {
298 warn "Upgrade not possible, no upgrade file found ($upgrade_file), please create one\n";
302 # backup if necessary then apply upgrade
303 $self->_filedata($self->_read_sql_file($upgrade_file));
304 $self->backup() if($self->do_backup);
305 $self->txn_do(sub { $self->do_upgrade() });
307 # set row in dbix_class_schema_versions table
308 $self->_set_db_version;
313 This is an overwritable method used to run your upgrade. The freeform method
314 allows you to run your upgrade any way you please, you can call C<run_upgrade>
315 any number of times to run the actual SQL commands, and in between you can
316 sandwich your data upgrading. For example, first run all the B<CREATE>
317 commands, then migrate your data from old to new tables/formats, then
318 issue the DROP commands when you are finished. Will run the whole file as it is by default.
326 # just run all the commands (including inserts) in order
327 $self->run_upgrade(qr/.*?/);
332 $self->run_upgrade(qr/create/i);
334 Runs a set of SQL statements matching a passed in regular expression. The
335 idea is that this method can be called any number of times from your
336 C<do_upgrade> method, running whichever commands you specify via the
337 regex in the parameter. Probably won't work unless called from the overridable
344 my ($self, $stm) = @_;
346 return unless ($self->_filedata);
347 my @statements = grep { $_ =~ $stm } @{$self->_filedata};
348 $self->_filedata([ grep { $_ !~ /$stm/i } @{$self->_filedata} ]);
352 $self->storage->debugobj->query_start($_) if $self->storage->debug;
353 $self->apply_statement($_);
354 $self->storage->debugobj->query_end($_) if $self->storage->debug;
360 =head2 apply_statement
362 Takes an SQL statement and runs it. Override this if you want to handle errors
367 sub apply_statement {
368 my ($self, $statement) = @_;
370 $self->storage->dbh->do($_) or warn "SQL was:\n $_";
373 =head2 get_db_version
375 Returns the version that your database is currently at. This is determined by the values in the
376 dbix_class_schema_versions table that C<upgrade> and C<install> write to.
382 my ($self, $rs) = @_;
384 my $vtable = $self->{vschema}->resultset('Table');
387 my $stamp = $vtable->get_column('installed')->max;
388 $version = $vtable->search({ installed => $stamp })->first->version;
393 =head2 schema_version
395 Returns the current schema class' $VERSION
401 This is an overwritable method which is called just before the upgrade, to
402 allow you to make a backup of the database. Per default this method attempts
403 to call C<< $self->storage->backup >>, to run the standard backup on each
406 This method should return the name of the backup file, if appropriate..
408 This method is disabled by default. Set $schema->do_backup(1) to enable it.
415 ## Make each ::DBI::Foo do this
416 $self->storage->backup($self->backup_directory());
421 Overloaded method. This checks the DBIC schema version against the DB version and
422 warns if they are not the same or if the DB is unversioned. It also provides
423 compatibility between the old versions table (SchemaVersions) and the new one
424 (dbix_class_schema_versions).
426 To avoid the checks on connect, set the env var DBIC_NO_VERSION_CHECK or alternatively you can set the ignore_version attr in the forth argument like so:
428 my $schema = MyApp::Schema->connect(
432 { ignore_version => 1 },
439 $self->next::method(@_);
440 $self->_on_connect($_[3]);
446 my ($self, $args) = @_;
448 $args = {} unless $args;
449 $self->{vschema} = DBIx::Class::Version->connect(@{$self->storage->connect_info()});
450 my $vtable = $self->{vschema}->resultset('Table');
452 # check for legacy versions table and move to new if exists
453 my $vschema_compat = DBIx::Class::VersionCompat->connect(@{$self->storage->connect_info()});
454 unless ($self->_source_exists($vtable)) {
455 my $vtable_compat = $vschema_compat->resultset('TableCompat');
456 if ($self->_source_exists($vtable_compat)) {
457 $self->{vschema}->deploy;
458 map { $vtable->create({ installed => $_->Installed, version => $_->Version }) } $vtable_compat->all;
459 $self->storage->dbh->do("DROP TABLE " . $vtable_compat->result_source->from);
463 # useful when connecting from scripts etc
464 return if ($args->{ignore_version} || ($ENV{DBIC_NO_VERSION_CHECK} && !exists $args->{ignore_version}));
465 my $pversion = $self->get_db_version();
467 if($pversion eq $self->schema_version)
469 # warn "This version is already installed\n";
475 warn "Your DB is currently unversioned. Please call upgrade on your schema to sync the DB.\n";
479 warn "Versions out of sync. This is " . $self->schema_version .
480 ", your database contains version $pversion, please call upgrade on your Schema.\n";
483 # is this just a waste of time? if not then merge with DBI.pm
484 sub _create_db_to_schema_diff {
487 my %driver_to_db_map = (
491 my $db = $driver_to_db_map{$self->storage->dbh->{Driver}->{Name}};
493 print "Sorry, this is an unsupported DB\n";
497 eval 'require SQL::Translator "0.09"';
499 $self->throw_exception("SQL::Translator 0.09 required");
502 my $db_tr = SQL::Translator->new({
505 parser_args => { dbh => $self->storage->dbh }
508 $db_tr->producer($db);
509 my $dbic_tr = SQL::Translator->new;
510 $dbic_tr->parser('SQL::Translator::Parser::DBIx::Class');
511 $dbic_tr = $self->storage->configure_sqlt($dbic_tr, $db);
512 $dbic_tr->data($self);
513 $dbic_tr->producer($db);
515 $db_tr->schema->name('db_schema');
516 $dbic_tr->schema->name('dbic_schema');
518 # is this really necessary?
519 foreach my $tr ($db_tr, $dbic_tr) {
520 my $data = $tr->data;
521 $tr->parser->($tr, $$data);
524 my $diff = SQL::Translator::Diff::schema_diff($db_tr->schema, $db,
525 $dbic_tr->schema, $db,
526 { ignore_constraint_names => 1, ignore_index_names => 1, caseopt => 1 });
528 my $filename = $self->ddl_filename(
530 $self->schema_version,
531 $self->upgrade_directory,
535 if(!open($file, ">$filename"))
537 $self->throw_exception("Can't open $filename for writing ($!)");
543 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";
547 sub _set_db_version {
550 my $vtable = $self->{vschema}->resultset('Table');
551 $vtable->create({ version => $self->schema_version,
552 installed => strftime("%Y-%m-%d %H:%M:%S", gmtime())
559 my $file = shift || return;
562 open $fh, "<$file" or warn("Can't open upgrade file, $file ($!)");
563 my @data = split(/\n/, join('', <$fh>));
564 @data = grep(!/^--/, @data);
565 @data = split(/;/, join('', @data));
567 @data = grep { $_ && $_ !~ /^-- / } @data;
568 @data = grep { $_ !~ /^(BEGIN|BEGIN TRANSACTION|COMMIT)/m } @data;
574 my ($self, $rs) = @_;
577 $rs->search({ 1, 0 })->count;
579 return 0 if $@ || !defined $c;
589 Jess Robinson <castaway@desert-island.demon.co.uk>
590 Luke Saunders <luke@shadowcatsystems.co.uk>
594 You may distribute this code under the same terms as Perl itself.