/usr/share/perl5/DBIx/Class/Schema/Versioned.pm is in libdbix-class-perl 0.082840-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 | package # Hide from PAUSE
DBIx::Class::Version::Table;
use base 'DBIx::Class::Core';
use strict;
use warnings;
__PACKAGE__->table('dbix_class_schema_versions');
__PACKAGE__->add_columns
( 'version' => {
'data_type' => 'VARCHAR',
'is_auto_increment' => 0,
'default_value' => undef,
'is_foreign_key' => 0,
'name' => 'version',
'is_nullable' => 0,
'size' => '10'
},
'installed' => {
'data_type' => 'VARCHAR',
'is_auto_increment' => 0,
'default_value' => undef,
'is_foreign_key' => 0,
'name' => 'installed',
'is_nullable' => 0,
'size' => '20'
},
);
__PACKAGE__->set_primary_key('version');
package # Hide from PAUSE
DBIx::Class::Version::TableCompat;
use base 'DBIx::Class::Core';
__PACKAGE__->table('SchemaVersions');
__PACKAGE__->add_columns
( 'Version' => {
'data_type' => 'VARCHAR',
},
'Installed' => {
'data_type' => 'VARCHAR',
},
);
__PACKAGE__->set_primary_key('Version');
package # Hide from PAUSE
DBIx::Class::Version;
use base 'DBIx::Class::Schema';
use strict;
use warnings;
__PACKAGE__->register_class('Table', 'DBIx::Class::Version::Table');
package # Hide from PAUSE
DBIx::Class::VersionCompat;
use base 'DBIx::Class::Schema';
use strict;
use warnings;
__PACKAGE__->register_class('TableCompat', 'DBIx::Class::Version::TableCompat');
# ---------------------------------------------------------------------------
=head1 NAME
DBIx::Class::Schema::Versioned - DBIx::Class::Schema plugin for Schema upgrades
=head1 SYNOPSIS
package MyApp::Schema;
use base qw/DBIx::Class::Schema/;
our $VERSION = 0.001;
# load MyApp::Schema::CD, MyApp::Schema::Book, MyApp::Schema::DVD
__PACKAGE__->load_classes(qw/CD Book DVD/);
__PACKAGE__->load_components(qw/Schema::Versioned/);
__PACKAGE__->upgrade_directory('/path/to/upgrades/');
=head1 DESCRIPTION
This module provides methods to apply DDL changes to your database using SQL
diff files. Normally these diff files would be created using
L<DBIx::Class::Schema/create_ddl_dir>.
A table called I<dbix_class_schema_versions> is created and maintained by the
module. This is used to determine which version your database is currently at.
Similarly the $VERSION in your DBIC schema class is used to determine the
current DBIC schema version.
The upgrade is initiated manually by calling C<upgrade> on your schema object,
this will attempt to upgrade the database from its current version to the current
schema version using a diff from your I<upgrade_directory>. If a suitable diff is
not found then no upgrade is possible.
=head1 SEE ALSO
L<DBIx::Class::DeploymentHandler> is a much more powerful alternative to this
module. Examples of things it can do that this module cannot do include
=over
=item *
Downgrades in addition to upgrades
=item *
Multiple sql files per upgrade/downgrade/install
=item *
Perl scripts allowed for upgrade/downgrade/install
=item *
Just one set of files needed for upgrade, unlike this module where one might
need to generate C<factorial(scalar @versions)>
=back
=head1 GETTING STARTED
Firstly you need to setup your schema class as per the L</SYNOPSIS>, make sure
you have specified an upgrade_directory and an initial $VERSION.
Then you'll need two scripts, one to create DDL files and diffs and another to perform
upgrades. Your creation script might look like a bit like this:
use strict;
use Pod::Usage;
use Getopt::Long;
use MyApp::Schema;
my ( $preversion, $help );
GetOptions(
'p|preversion:s' => \$preversion,
) or die pod2usage;
my $schema = MyApp::Schema->connect(
$dsn,
$user,
$password,
);
my $sql_dir = './sql';
my $version = $schema->schema_version();
$schema->create_ddl_dir( 'MySQL', $version, $sql_dir, $preversion );
Then your upgrade script might look like so:
use strict;
use MyApp::Schema;
my $schema = MyApp::Schema->connect(
$dsn,
$user,
$password,
);
if (!$schema->get_db_version()) {
# schema is unversioned
$schema->deploy();
} else {
$schema->upgrade();
}
The script above assumes that if the database is unversioned then it is empty
and we can safely deploy the DDL to it. However things are not always so simple.
if you want to initialise a pre-existing database where the DDL is not the same
as the DDL for your current schema version then you will need a diff which
converts the database's DDL to the current DDL. The best way to do this is
to get a dump of the database schema (without data) and save that in your
SQL directory as version 0.000 (the filename must be as with
L<DBIx::Class::Schema/ddl_filename>) then create a diff using your create DDL
script given above from version 0.000 to the current version. Then hand check
and if necessary edit the resulting diff to ensure that it will apply. Once you have
done all that you can do this:
if (!$schema->get_db_version()) {
# schema is unversioned
$schema->install("0.000");
}
# this will now apply the 0.000 to current version diff
$schema->upgrade();
In the case of an unversioned database the above code will create the
dbix_class_schema_versions table and write version 0.000 to it, then
upgrade will then apply the diff we talked about creating in the previous paragraph
and then you're good to go.
=cut
package DBIx::Class::Schema::Versioned;
use strict;
use warnings;
use base 'DBIx::Class::Schema';
use DBIx::Class::Carp;
use Time::HiRes qw/gettimeofday/;
use Try::Tiny;
use Scalar::Util 'weaken';
use namespace::clean;
__PACKAGE__->mk_classdata('_filedata');
__PACKAGE__->mk_classdata('upgrade_directory');
__PACKAGE__->mk_classdata('backup_directory');
__PACKAGE__->mk_classdata('do_backup');
__PACKAGE__->mk_classdata('do_diff_on_init');
=head1 METHODS
=head2 upgrade_directory
Use this to set the directory your upgrade files are stored in.
=head2 backup_directory
Use this to set the directory you want your backups stored in (note that backups
are disabled by default).
=cut
=head2 install
=over 4
=item Arguments: $db_version
=back
Call this to initialise a previously unversioned database. The table 'dbix_class_schema_versions' will be created which will be used to store the database version.
Takes one argument which should be the version that the database is currently at. Defaults to the return value of L</schema_version>.
See L</GETTING STARTED> for more details.
=cut
sub install
{
my ($self, $new_version) = @_;
# must be called on a fresh database
if ($self->get_db_version()) {
$self->throw_exception("A versioned schema has already been deployed, try upgrade instead.\n");
}
# default to current version if none passed
$new_version ||= $self->schema_version();
if ($new_version) {
# create versions table and version row
$self->{vschema}->deploy;
$self->_set_db_version({ version => $new_version });
}
}
=head2 deploy
Same as L<DBIx::Class::Schema/deploy> but also calls C<install>.
=cut
sub deploy {
my $self = shift;
$self->next::method(@_);
$self->install();
}
=head2 create_upgrade_path
=over 4
=item Arguments: { upgrade_file => $file }
=back
Virtual method that should be overridden to create an upgrade file.
This is useful in the case of upgrading across multiple versions
to concatenate several files to create one upgrade file.
You'll probably want the db_version retrieved via $self->get_db_version
and the schema_version which is retrieved via $self->schema_version
=cut
sub create_upgrade_path {
## override this method
}
=head2 ordered_schema_versions
=over 4
=item Return Value: a list of version numbers, ordered from lowest to highest
=back
Virtual method that should be overridden to return an ordered list
of schema versions. This is then used to produce a set of steps to
upgrade through to achieve the required schema version.
You may want the db_version retrieved via $self->get_db_version
and the schema_version which is retrieved via $self->schema_version
=cut
sub ordered_schema_versions {
## override this method
}
=head2 upgrade
Call this to attempt to upgrade your database from the version it
is at to the version this DBIC schema is at. If they are the same
it does nothing.
It will call L</ordered_schema_versions> to retrieve an ordered
list of schema versions (if ordered_schema_versions returns nothing
then it is assumed you can do the upgrade as a single step). It
then iterates through the list of versions between the current db
version and the schema version applying one update at a time until
all relevant updates are applied.
The individual update steps are performed by using
L</upgrade_single_step>, which will apply the update and also
update the dbix_class_schema_versions table.
=cut
sub upgrade {
my ($self) = @_;
my $db_version = $self->get_db_version();
# db unversioned
unless ($db_version) {
carp 'Upgrade not possible as database is unversioned. Please call install first.';
return;
}
# db and schema at same version. do nothing
if ( $db_version eq $self->schema_version ) {
carp 'Upgrade not necessary';
return;
}
my @version_list = $self->ordered_schema_versions;
# if nothing returned then we preload with min/max
@version_list = ( $db_version, $self->schema_version )
unless ( scalar(@version_list) );
# catch the case of someone returning an arrayref
@version_list = @{ $version_list[0] }
if ( ref( $version_list[0] ) eq 'ARRAY' );
# remove all versions in list above the required version
while ( scalar(@version_list)
&& ( $version_list[-1] ne $self->schema_version ) )
{
pop @version_list;
}
# remove all versions in list below the current version
while ( scalar(@version_list) && ( $version_list[0] ne $db_version ) ) {
shift @version_list;
}
# check we have an appropriate list of versions
if ( scalar(@version_list) < 2 ) {
die;
}
# do sets of upgrade
while ( scalar(@version_list) >= 2 ) {
$self->upgrade_single_step( $version_list[0], $version_list[1] );
shift @version_list;
}
}
=head2 upgrade_single_step
=over 4
=item Arguments: db_version - the version currently within the db
=item Arguments: target_version - the version to upgrade to
=back
Call this to attempt to upgrade your database from the
I<db_version> to the I<target_version>. If they are the same it
does nothing.
It requires an SQL diff file to exist in your I<upgrade_directory>,
normally you will have created this using L<DBIx::Class::Schema/create_ddl_dir>.
If successful the dbix_class_schema_versions table is updated with
the I<target_version>.
This method may be called repeatedly by the upgrade method to
upgrade through a series of updates.
=cut
sub upgrade_single_step
{
my ($self,
$db_version,
$target_version) = @_;
# db and schema at same version. do nothing
if ($db_version eq $target_version) {
carp 'Upgrade not necessary';
return;
}
# strangely the first time this is called can
# differ to subsequent times. so we call it
# here to be sure.
# XXX - just fix it
$self->storage->sqlt_type;
my $upgrade_file = $self->ddl_filename(
$self->storage->sqlt_type,
$target_version,
$self->upgrade_directory,
$db_version,
);
$self->create_upgrade_path({ upgrade_file => $upgrade_file });
unless (-f $upgrade_file) {
carp "Upgrade not possible, no upgrade file found ($upgrade_file), please create one";
return;
}
carp "DB version ($db_version) is lower than the schema version (".$self->schema_version."). Attempting upgrade.\n";
# backup if necessary then apply upgrade
$self->_filedata($self->_read_sql_file($upgrade_file));
$self->backup() if($self->do_backup);
$self->txn_do(sub { $self->do_upgrade() });
# set row in dbix_class_schema_versions table
$self->_set_db_version({version => $target_version});
}
=head2 do_upgrade
This is an overwritable method used to run your upgrade. The freeform method
allows you to run your upgrade any way you please, you can call C<run_upgrade>
any number of times to run the actual SQL commands, and in between you can
sandwich your data upgrading. For example, first run all the B<CREATE>
commands, then migrate your data from old to new tables/formats, then
issue the DROP commands when you are finished. Will run the whole file as it is by default.
=cut
sub do_upgrade
{
my ($self) = @_;
# just run all the commands (including inserts) in order
$self->run_upgrade(qr/.*?/);
}
=head2 run_upgrade
$self->run_upgrade(qr/create/i);
Runs a set of SQL statements matching a passed in regular expression. The
idea is that this method can be called any number of times from your
C<do_upgrade> method, running whichever commands you specify via the
regex in the parameter. Probably won't work unless called from the overridable
do_upgrade method.
=cut
sub run_upgrade
{
my ($self, $stm) = @_;
return unless ($self->_filedata);
my @statements = grep { $_ =~ $stm } @{$self->_filedata};
$self->_filedata([ grep { $_ !~ /$stm/i } @{$self->_filedata} ]);
for (@statements)
{
$self->storage->debugobj->query_start($_) if $self->storage->debug;
$self->apply_statement($_);
$self->storage->debugobj->query_end($_) if $self->storage->debug;
}
return 1;
}
=head2 apply_statement
Takes an SQL statement and runs it. Override this if you want to handle errors
differently.
=cut
sub apply_statement {
my ($self, $statement) = @_;
$self->storage->dbh->do($_) or carp "SQL was: $_";
}
=head2 get_db_version
Returns the version that your database is currently at. This is determined by the values in the
dbix_class_schema_versions table that C<upgrade> and C<install> write to.
=cut
sub get_db_version
{
my ($self, $rs) = @_;
my $vtable = $self->{vschema}->resultset('Table');
my $version = try {
$vtable->search({}, { order_by => { -desc => 'installed' }, rows => 1 } )
->get_column ('version')
->next;
};
return $version || 0;
}
=head2 schema_version
Returns the current schema class' $VERSION
=cut
=head2 backup
This is an overwritable method which is called just before the upgrade, to
allow you to make a backup of the database. Per default this method attempts
to call C<< $self->storage->backup >>, to run the standard backup on each
database type.
This method should return the name of the backup file, if appropriate..
This method is disabled by default. Set $schema->do_backup(1) to enable it.
=cut
sub backup
{
my ($self) = @_;
## Make each ::DBI::Foo do this
$self->storage->backup($self->backup_directory());
}
=head2 connection
Overloaded method. This checks the DBIC schema version against the DB version and
warns if they are not the same or if the DB is unversioned. It also provides
compatibility between the old versions table (SchemaVersions) and the new one
(dbix_class_schema_versions).
To avoid the checks on connect, set the environment var DBIC_NO_VERSION_CHECK or alternatively you can set the ignore_version attr in the forth argument like so:
my $schema = MyApp::Schema->connect(
$dsn,
$user,
$password,
{ ignore_version => 1 },
);
=cut
sub connection {
my $self = shift;
$self->next::method(@_);
$self->_on_connect();
return $self;
}
sub _on_connect
{
my ($self) = @_;
weaken (my $w_storage = $self->storage );
$self->{vschema} = DBIx::Class::Version->connect(
sub { $w_storage->dbh },
# proxy some flags from the main storage
{ map { $_ => $w_storage->$_ } qw( unsafe ) },
);
my $conn_attrs = $w_storage->_dbic_connect_attributes || {};
my $vtable = $self->{vschema}->resultset('Table');
# useful when connecting from scripts etc
return if ($conn_attrs->{ignore_version} || ($ENV{DBIC_NO_VERSION_CHECK} && !exists $conn_attrs->{ignore_version}));
# check for legacy versions table and move to new if exists
unless ($self->_source_exists($vtable)) {
my $vtable_compat = DBIx::Class::VersionCompat->connect(sub { $w_storage->dbh })->resultset('TableCompat');
if ($self->_source_exists($vtable_compat)) {
$self->{vschema}->deploy;
map { $vtable->new_result({ installed => $_->Installed, version => $_->Version })->insert } $vtable_compat->all;
$self->storage->_get_dbh->do("DROP TABLE " . $vtable_compat->result_source->from);
}
}
my $pversion = $self->get_db_version();
if($pversion eq $self->schema_version)
{
#carp "This version is already installed";
return 1;
}
if(!$pversion)
{
carp "Your DB is currently unversioned. Please call upgrade on your schema to sync the DB.";
return 1;
}
carp "Versions out of sync. This is " . $self->schema_version .
", your database contains version $pversion, please call upgrade on your Schema.";
}
# is this just a waste of time? if not then merge with DBI.pm
sub _create_db_to_schema_diff {
my $self = shift;
my %driver_to_db_map = (
'mysql' => 'MySQL'
);
my $db = $driver_to_db_map{$self->storage->dbh->{Driver}->{Name}};
unless ($db) {
print "Sorry, this is an unsupported DB\n";
return;
}
unless (DBIx::Class::Optional::Dependencies->req_ok_for ('deploy')) {
$self->throw_exception("Unable to proceed without " . DBIx::Class::Optional::Dependencies->req_missing_for ('deploy') );
}
my $db_tr = SQL::Translator->new({
add_drop_table => 1,
parser => 'DBI',
parser_args => { dbh => $self->storage->dbh }
});
$db_tr->producer($db);
my $dbic_tr = SQL::Translator->new;
$dbic_tr->parser('SQL::Translator::Parser::DBIx::Class');
$dbic_tr->data($self);
$dbic_tr->producer($db);
$db_tr->schema->name('db_schema');
$dbic_tr->schema->name('dbic_schema');
# is this really necessary?
foreach my $tr ($db_tr, $dbic_tr) {
my $data = $tr->data;
$tr->parser->($tr, $$data);
}
my $diff = SQL::Translator::Diff::schema_diff($db_tr->schema, $db,
$dbic_tr->schema, $db,
{ ignore_constraint_names => 1, ignore_index_names => 1, caseopt => 1 });
my $filename = $self->ddl_filename(
$db,
$self->schema_version,
$self->upgrade_directory,
'PRE',
);
my $file;
if(!open($file, ">$filename"))
{
$self->throw_exception("Can't open $filename for writing ($!)");
next;
}
print $file $diff;
close($file);
carp "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.";
}
sub _set_db_version {
my $self = shift;
my ($params) = @_;
$params ||= {};
my $version = $params->{version} ? $params->{version} : $self->schema_version;
my $vtable = $self->{vschema}->resultset('Table');
##############################################################################
# !!! NOTE !!!
##############################################################################
#
# The travesty below replaces the old nice timestamp format of %Y-%m-%d %H:%M:%S
# This is necessary since there are legitimate cases when upgrades can happen
# back to back within the same second. This breaks things since we relay on the
# ability to sort by the 'installed' value. The logical choice of an autoinc
# is not possible, as it will break multiple legacy installations. Also it is
# not possible to format the string sanely, as the column is a varchar(20).
# The 'v' character is added to the front of the string, so that any version
# formatted by this new function will sort _after_ any existing 200... strings.
my @tm = gettimeofday();
my @dt = gmtime ($tm[0]);
my $o = $vtable->new_result({
version => $version,
installed => sprintf("v%04d%02d%02d_%02d%02d%02d.%03.0f",
$dt[5] + 1900,
$dt[4] + 1,
$dt[3],
$dt[2],
$dt[1],
$dt[0],
int($tm[1] / 1000), # convert to millisecs
),
})->insert;
}
sub _read_sql_file {
my $self = shift;
my $file = shift || return;
open my $fh, '<', $file or carp("Can't open upgrade file, $file ($!)");
my @data = split /\n/, join '', <$fh>;
close $fh;
@data = split /;/,
join '',
grep { $_ &&
!/^--/ &&
!/^(BEGIN|BEGIN TRANSACTION|COMMIT)/mi }
@data;
return \@data;
}
sub _source_exists
{
my ($self, $rs) = @_;
return try {
$rs->search(\'1=0')->cursor->next;
1;
} catch {
0;
};
}
=head1 FURTHER QUESTIONS?
Check the list of L<additional DBIC resources|DBIx::Class/GETTING HELP/SUPPORT>.
=head1 COPYRIGHT AND LICENSE
This module is free software L<copyright|DBIx::Class/COPYRIGHT AND LICENSE>
by the L<DBIx::Class (DBIC) authors|DBIx::Class/AUTHORS>. You can
redistribute it and/or modify it under the same terms as the
L<DBIx::Class library|DBIx::Class/COPYRIGHT AND LICENSE>.
=cut
1;
|