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1 | package DBIx::Class::Version::Table; |
2 | use base 'DBIx::Class'; |
3 | use strict; |
4 | use warnings; |
5 | |
6 | __PACKAGE__->load_components(qw/ Core/); |
7 | __PACKAGE__->table('SchemaVersions'); |
8 | |
9 | __PACKAGE__->add_columns |
10 | ( 'Version' => { |
11 | 'data_type' => 'VARCHAR', |
12 | 'is_auto_increment' => 0, |
13 | 'default_value' => undef, |
14 | 'is_foreign_key' => 0, |
15 | 'name' => 'Version', |
16 | 'is_nullable' => 0, |
17 | 'size' => '10' |
18 | }, |
19 | 'Installed' => { |
20 | 'data_type' => 'VARCHAR', |
21 | 'is_auto_increment' => 0, |
22 | 'default_value' => undef, |
23 | 'is_foreign_key' => 0, |
24 | 'name' => 'Installed', |
25 | 'is_nullable' => 0, |
26 | 'size' => '20' |
27 | }, |
28 | ); |
29 | __PACKAGE__->set_primary_key('Version'); |
30 | |
31 | package DBIx::Class::Version; |
32 | use base 'DBIx::Class::Schema'; |
33 | use strict; |
34 | use warnings; |
35 | |
36 | __PACKAGE__->register_class('Table', 'DBIx::Class::Version::Table'); |
37 | |
38 | |
39 | # --------------------------------------------------------------------------- |
40 | package DBIx::Class::Schema::Versioned; |
41 | |
42 | use strict; |
43 | use warnings; |
44 | use base 'DBIx::Class'; |
45 | use POSIX 'strftime'; |
46 | use Data::Dumper; |
47 | |
48 | __PACKAGE__->mk_classdata('_filedata'); |
49 | __PACKAGE__->mk_classdata('upgrade_directory'); |
50 | |
51 | sub on_connect |
52 | { |
53 | my ($self) = @_; |
54 | my $vschema = DBIx::Class::Version->connect(@{$self->storage->connect_info()}); |
55 | my $vtable = $vschema->resultset('Table'); |
56 | my $pversion; |
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57 | |
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58 | if(!$self->exists($vtable)) |
59 | { |
60 | # $vschema->storage->debug(1); |
61 | $vschema->storage->ensure_connected(); |
62 | $vschema->deploy(); |
63 | $pversion = 0; |
64 | } |
65 | else |
66 | { |
67 | my $psearch = $vtable->search(undef, |
68 | { select => [ |
69 | { 'max' => 'Installed' }, |
70 | ], |
71 | as => ['maxinstall'], |
72 | })->first; |
73 | $pversion = $vtable->search({ Installed => $psearch->get_column('maxinstall'), |
74 | })->first; |
75 | $pversion = $pversion->Version if($pversion); |
76 | } |
77 | # warn("Previous version: $pversion\n"); |
78 | if($pversion eq $self->VERSION) |
79 | { |
80 | warn "This version is already installed\n"; |
81 | return 1; |
82 | } |
83 | |
84 | ## use IC::DT? |
85 | |
86 | if(!$pversion) |
87 | { |
88 | $vtable->create({ Version => $self->VERSION, |
89 | Installed => strftime("%Y-%m-%d %H:%M:%S", gmtime()) |
90 | }); |
91 | ## If we let the user do this, where does the Version table get updated? |
92 | warn "No previous version found, calling deploy to install this version.\n"; |
93 | $self->deploy(); |
94 | return 1; |
95 | } |
96 | |
97 | my $file = $self->ddl_filename( |
98 | $self->storage->sqlt_type, |
99 | $self->upgrade_directory, |
100 | $self->VERSION |
101 | ); |
102 | if(!$file) |
103 | { |
104 | # No upgrade path between these two versions |
105 | return 1; |
106 | } |
107 | |
108 | $file = $self->ddl_filename( |
109 | $self->storage->sqlt_type, |
110 | $self->upgrade_directory, |
111 | $self->VERSION, |
112 | $pversion, |
113 | ); |
114 | # $file =~ s/@{[ $self->VERSION ]}/"${pversion}-" . $self->VERSION/e; |
115 | if(!-f $file) |
116 | { |
117 | warn "Upgrade not possible, no upgrade file found ($file)\n"; |
118 | return; |
119 | } |
120 | |
121 | my $fh; |
122 | open $fh, "<$file" or warn("Can't open upgrade file, $file ($!)"); |
123 | my @data = split(/;\n/, join('', <$fh>)); |
124 | close($fh); |
125 | @data = grep { $_ && $_ !~ /^-- / } @data; |
126 | @data = grep { $_ !~ /^(BEGIN TRANACTION|COMMIT)/m } @data; |
127 | |
128 | $self->_filedata(\@data); |
129 | |
130 | ## Don't do this yet, do only on command? |
131 | ## If we do this later, where does the Version table get updated?? |
132 | warn "Versions out of sync. This is " . $self->VERSION . |
133 | ", your database contains version $pversion, please call upgrade on your Schema.\n"; |
134 | # $self->upgrade($pversion, $self->VERSION); |
135 | } |
136 | |
137 | sub exists |
138 | { |
139 | my ($self, $rs) = @_; |
140 | |
141 | my $c = eval { |
142 | $rs->search({ 1, 0 })->count; |
143 | }; |
144 | return 0 if $@ || !defined $c; |
145 | |
146 | return 1; |
147 | } |
148 | |
149 | sub backup |
150 | { |
151 | my ($self) = @_; |
152 | ## Make each ::DBI::Foo do this |
153 | $self->storage->backup(); |
154 | } |
155 | |
156 | sub upgrade |
157 | { |
158 | my ($self) = @_; |
159 | |
160 | ## overridable sub, per default just run all the commands. |
161 | |
162 | $self->backup(); |
163 | |
164 | $self->run_upgrade(qr/create/i); |
165 | $self->run_upgrade(qr/alter table .*? add/i); |
166 | $self->run_upgrade(qr/alter table .*? (?!drop)/i); |
167 | $self->run_upgrade(qr/alter table .*? drop/i); |
168 | $self->run_upgrade(qr/drop/i); |
169 | # $self->run_upgrade(qr//i); |
170 | |
171 | my $vschema = DBIx::Class::Version->connect(@{$self->storage->connect_info()}); |
172 | my $vtable = $vschema->resultset('Table'); |
173 | $vtable->create({ Version => $self->VERSION, |
174 | Installed => strftime("%Y-%m-%d %H:%M:%S", gmtime()) |
175 | }); |
176 | } |
177 | |
178 | |
179 | sub run_upgrade |
180 | { |
181 | my ($self, $stm) = @_; |
182 | # print "Reg: $stm\n"; |
183 | my @statements = grep { $_ =~ $stm } @{$self->_filedata}; |
184 | # print "Statements: ", join("\n", @statements), "\n"; |
185 | $self->_filedata([ grep { $_ !~ /$stm/i } @{$self->_filedata} ]); |
186 | |
187 | for (@statements) |
188 | { |
189 | $self->storage->debugfh->print("$_\n") if $self->storage->debug; |
190 | # print "Running \n>>$_<<\n"; |
191 | $self->storage->dbh->do($_) or warn "SQL was:\n $_"; |
192 | } |
193 | |
194 | return 1; |
195 | } |
196 | |
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197 | 1; |
198 | |
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199 | =head1 NAME |
200 | |
201 | DBIx::Class::Versioning - DBIx::Class::Schema plugin for Schema upgrades |
202 | |
203 | =head1 SYNOPSIS |
204 | |
205 | package Library::Schema; |
206 | use base qw/DBIx::Class::Schema/; |
207 | # load Library::Schema::CD, Library::Schema::Book, Library::Schema::DVD |
208 | __PACKAGE__->load_classes(qw/CD Book DVD/); |
209 | |
210 | __PACKAGE__->load_components(qw/+DBIx::Class::Schema::Versioned/); |
211 | __PACKAGE__->upgrade_directory('/path/to/upgrades/'); |
212 | |
213 | sub backup |
214 | { |
215 | my ($self) = @_; |
216 | # my special backup process |
217 | } |
218 | |
219 | sub upgrade |
220 | { |
221 | my ($self) = @_; |
222 | |
223 | ## overridable sub, per default just runs all the commands. |
224 | |
225 | $self->run_upgrade(qr/create/i); |
226 | $self->run_upgrade(qr/alter table .*? add/i); |
227 | $self->run_upgrade(qr/alter table .*? (?!drop)/i); |
228 | $self->run_upgrade(qr/alter table .*? drop/i); |
229 | $self->run_upgrade(qr/drop/i); |
230 | $self->run_upgrade(qr//i); |
231 | } |
232 | |
233 | =head1 DESCRIPTION |
234 | |
235 | This module is a component designed to extend L<DBIx::Class::Schema> |
236 | classes, to enable them to upgrade to newer schema layouts. To use this |
237 | module, you need to have called C<create_ddl_dir> on your Schema to |
238 | create your upgrade files to include with your delivery. |
239 | |
240 | A table called I<SchemaVersions> is created and maintained by the |
241 | module. This contains two fields, 'Version' and 'Installed', which |
242 | contain each VERSION of your Schema, and the date+time it was installed. |
243 | |
244 | If you would like to influence which levels of version change need |
245 | upgrades in your Schema, you can override the method C<ddl_filename> |
246 | in L<DBIx::Class::Schema>. Return a false value if there is no upgrade |
247 | path between the two versions supplied. By default, every change in |
248 | your VERSION is regarded as needing an upgrade. |
249 | |
250 | NB: At the moment, SQLite upgrading is rather spotty, as SQL::Translator::Diff |
251 | returns SQL statements that SQLite does not support. |
252 | |
253 | |
254 | =head1 METHODS |
255 | |
256 | =head2 backup |
257 | |
258 | This is an overwritable method which is called just before the upgrade, to |
259 | allow you to make a backup of the database. Per default this method attempts |
260 | to call C<< $self->storage->backup >>, to run the standard backup on each |
261 | database type. |
262 | |
263 | This method should return the name of the backup file, if appropriate. |
264 | |
265 | C<backup> is called from C<upgrade>, make sure you call it, if you write your |
266 | own <upgrade> method. |
267 | |
268 | =head2 upgrade |
269 | |
270 | This is an overwritable method used to run your upgrade. The freeform method |
271 | allows you to run your upgrade any way you please, you can call C<run_upgrade> |
272 | any number of times to run the actual SQL commands, and in between you can |
273 | sandwich your data upgrading. For example, first run all the B<CREATE> |
274 | commands, then migrate your data from old to new tables/formats, then |
275 | issue the DROP commands when you are finished. |
276 | |
277 | =head2 run_upgrade |
278 | |
279 | $self->run_upgrade(qr/create/i); |
280 | |
281 | Runs a set of SQL statements matching a passed in regular expression. The |
282 | idea is that this method can be called any number of times from your |
283 | C<upgrade> method, running whichever commands you specify via the |
284 | regex in the parameter. |
285 | |
286 | =head1 AUTHOR |
287 | |
288 | Jess Robinson <castaway@desert-island.demon.co.uk> |