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1 | package DBIx::Class::Schema::Loader; |
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2 | |
3 | use strict; |
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4 | use warnings; |
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5 | use base qw/DBIx::Class::Schema Class::Data::Accessor/; |
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6 | use Carp::Clan qw/^DBIx::Class/; |
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7 | use UNIVERSAL::require; |
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8 | use Class::C3; |
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9 | use Scalar::Util qw/ weaken /; |
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10 | |
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11 | # Always remember to do all digits for the version even if they're 0 |
12 | # i.e. first release of 0.XX *must* be 0.XX000. This avoids fBSD ports |
13 | # brain damage and presumably various other packaging systems too |
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14 | our $VERSION = '0.04999_04'; |
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15 | |
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16 | __PACKAGE__->mk_classaccessor('_loader_args' => {}); |
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17 | __PACKAGE__->mk_classaccessors(qw/dump_to_dir _loader_invoked _loader loader_class/); |
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18 | |
19 | =head1 NAME |
20 | |
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21 | DBIx::Class::Schema::Loader - Dynamic definition of a DBIx::Class::Schema |
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22 | |
23 | =head1 SYNOPSIS |
24 | |
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25 | package My::Schema; |
26 | use base qw/DBIx::Class::Schema::Loader/; |
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27 | |
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28 | __PACKAGE__->loader_options( |
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29 | constraint => '^foo.*', |
30 | # debug => 1, |
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31 | ); |
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32 | |
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33 | # in seperate application code ... |
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34 | |
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35 | use My::Schema; |
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36 | |
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37 | my $schema1 = My::Schema->connect( $dsn, $user, $password, $attrs); |
38 | # -or- |
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39 | my $schema1 = "My::Schema"; $schema1->connection(as above); |
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40 | |
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41 | =head1 DESCRIPTION |
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42 | |
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43 | DBIx::Class::Schema::Loader automates the definition of a |
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44 | L<DBIx::Class::Schema> by scanning database table definitions and |
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45 | setting up the columns, primary keys, and relationships. |
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46 | |
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47 | DBIx::Class::Schema::Loader currently supports only the DBI storage type. |
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48 | It has explicit support for L<DBD::Pg>, L<DBD::mysql>, L<DBD::DB2>, |
49 | L<DBD::SQLite>, and L<DBD::Oracle>. Other DBI drivers may function to |
50 | a greater or lesser degree with this loader, depending on how much of the |
51 | DBI spec they implement, and how standard their implementation is. |
52 | |
53 | Patches to make other DBDs work correctly welcome. |
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54 | |
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55 | See L<DBIx::Class::Schema::Loader::DBI::Writing> for notes on writing |
56 | your own vendor-specific subclass for an unsupported DBD driver. |
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57 | |
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58 | This module requires L<DBIx::Class> 0.07006 or later, and obsoletes |
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59 | the older L<DBIx::Class::Loader>. |
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60 | |
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61 | This module is designed more to get you up and running quickly against |
62 | an existing database, or to be effective for simple situations, rather |
63 | than to be what you use in the long term for a complex database/project. |
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64 | |
65 | That being said, transitioning your code from a Schema generated by this |
66 | module to one that doesn't use this module should be straightforward and |
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67 | painless, so don't shy away from it just for fears of the transition down |
68 | the road. |
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69 | |
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70 | =head1 METHODS |
71 | |
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72 | =head2 loader_class |
73 | |
74 | Set the loader class to be instantiated when L</connection> is called. |
75 | If the classname starts with "::", "DBIx::Class::Schema::Loader" is |
76 | prepended. Defaults to L<DBIx::Class::Schema/storage_type> (which must |
77 | start with "::" when using L<DBIx::Class::Schema::Loader>). |
78 | |
79 | This is mostly useful for subclassing existing loaders or in conjunction |
80 | with L</dump_to_dir>. |
81 | |
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82 | =head2 loader_options |
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83 | |
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84 | Example in Synopsis above demonstrates a few common arguments. For |
85 | detailed information on all of the arguments, most of which are |
86 | only useful in fairly complex scenarios, see the |
87 | L<DBIx::Class::Schema::Loader::Base> documentation. |
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88 | |
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89 | If you intend to use C<loader_options>, you must call |
90 | C<loader_options> before any connection is made, or embed the |
91 | C<loader_options> in the connection information itself as shown |
92 | below. Setting C<loader_options> after the connection has |
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93 | already been made is useless. |
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94 | |
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95 | =cut |
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96 | |
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97 | sub loader_options { |
98 | my $self = shift; |
99 | |
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100 | my %args = (ref $_[0] eq 'HASH') ? %{$_[0]} : @_; |
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101 | $self->_loader_args(\%args); |
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102 | |
103 | $self; |
104 | } |
105 | |
106 | sub _invoke_loader { |
107 | my $self = shift; |
108 | my $class = ref $self || $self; |
109 | |
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110 | my $args = $self->_loader_args; |
111 | |
112 | # set up the schema/schema_class arguments |
113 | $args->{schema} = $self; |
114 | $args->{schema_class} = $class; |
115 | weaken($args->{schema}) if ref $self; |
116 | $args->{dump_directory} ||= $self->dump_to_dir; |
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117 | |
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118 | # XXX this only works for relative storage_type, like ::DBI ... |
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119 | my $impl = $self->loader_class |
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120 | || "DBIx::Class::Schema::Loader" . $self->storage_type; |
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121 | $impl = "DBIx::Class::Schema::Loader${impl}" if $impl =~ /^::/; |
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122 | $impl->require or |
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123 | croak qq/Could not load storage_type loader "$impl": / . |
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124 | qq/"$UNIVERSAL::require::ERROR"/; |
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125 | |
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126 | $self->_loader($impl->new(%$args)); |
127 | $self->_loader->load; |
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128 | $self->_loader_invoked(1); |
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129 | |
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130 | $self; |
131 | } |
132 | |
133 | =head2 connection |
134 | |
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135 | See L<DBIx::Class::Schema> for basic usage. |
136 | |
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137 | If the final argument is a hashref, and it contains the keys C<loader_options> |
138 | or C<loader_class>, those keys will be deleted, and their values value will be |
139 | used for the loader options or class, respectively, just as if set via the |
140 | L</loader_options> or L</loader_class> methods above. |
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141 | |
142 | The actual auto-loading operation (the heart of this module) will be invoked |
143 | as soon as the connection information is defined. |
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144 | |
145 | =cut |
146 | |
147 | sub connection { |
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148 | my $self = shift; |
149 | |
150 | if($_[-1] && ref $_[-1] eq 'HASH') { |
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151 | for my $option (qw/ loader_class loader_options /) { |
152 | if(my $value = delete $_[-1]->{$option}) { |
153 | $self->$option($value); |
154 | } |
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155 | } |
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156 | pop @_ if !keys %{$_[-1]}; |
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157 | } |
158 | |
159 | $self = $self->next::method(@_); |
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160 | |
161 | my $class = ref $self || $self; |
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162 | if(!$class->_loader_invoked) { |
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163 | $self->_invoke_loader |
164 | } |
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165 | |
166 | return $self; |
167 | } |
168 | |
169 | =head2 clone |
170 | |
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171 | See L<DBIx::Class::Schema>. |
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172 | |
173 | =cut |
174 | |
175 | sub clone { |
176 | my $self = shift; |
177 | |
178 | my $clone = $self->next::method(@_); |
179 | |
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180 | if($clone->_loader_args) { |
181 | $clone->_loader_args->{schema} = $clone; |
182 | weaken($clone->_loader_args->{schema}); |
183 | } |
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184 | |
185 | $clone; |
186 | } |
187 | |
188 | =head2 dump_to_dir |
189 | |
190 | Argument: directory name. |
191 | |
192 | Calling this as a class method on either L<DBIx::Class::Schema::Loader> |
193 | or any derived schema class will cause all affected schemas to dump |
194 | manual versions of themselves to the named directory when they are |
195 | loaded. In order to be effective, this must be set before defining a |
196 | connection on this schema class or any derived object (as the loading |
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197 | happens as soon as both a connection and loader_options are set, and |
198 | only once per class). |
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199 | |
200 | See L<DBIx::Class::Schema::Loader::Base/dump_directory> for more |
201 | details on the dumping mechanism. |
202 | |
203 | This can also be set at module import time via the import option |
204 | C<dump_to_dir:/foo/bar> to L<DBIx::Class::Schema::Loader>, where |
205 | C</foo/bar> is the target directory. |
206 | |
207 | Examples: |
208 | |
209 | # My::Schema isa DBIx::Class::Schema::Loader, and has connection info |
210 | # hardcoded in the class itself: |
211 | perl -MDBIx::Class::Schema::Loader=dump_to_dir:/foo/bar -MMy::Schema -e1 |
212 | |
213 | # Same, but no hard-coded connection, so we must provide one: |
214 | perl -MDBIx::Class::Schema::Loader=dump_to_dir:/foo/bar -MMy::Schema -e 'My::Schema->connection("dbi:Pg:dbname=foo", ...)' |
215 | |
216 | # Or as a class method, as long as you get it done *before* defining a |
217 | # connection on this schema class or any derived object: |
218 | use My::Schema; |
219 | My::Schema->dump_to_dir('/foo/bar'); |
220 | My::Schema->connection(........); |
221 | |
222 | # Or as a class method on the DBIx::Class::Schema::Loader itself, which affects all |
223 | # derived schemas |
224 | use My::Schema; |
225 | use My::OtherSchema; |
226 | DBIx::Class::Schema::Loader->dump_to_dir('/foo/bar'); |
227 | My::Schema->connection(.......); |
228 | My::OtherSchema->connection(.......); |
229 | |
230 | # Another alternative to the above: |
231 | use DBIx::Class::Schema::Loader qw| dump_to_dir:/foo/bar |; |
232 | use My::Schema; |
233 | use My::OtherSchema; |
234 | My::Schema->connection(.......); |
235 | My::OtherSchema->connection(.......); |
236 | |
237 | =cut |
238 | |
239 | sub import { |
240 | my $self = shift; |
241 | return if !@_; |
242 | foreach my $opt (@_) { |
243 | if($opt =~ m{^dump_to_dir:(.*)$}) { |
244 | $self->dump_to_dir($1) |
245 | } |
246 | elsif($opt eq 'make_schema_at') { |
247 | no strict 'refs'; |
248 | my $cpkg = (caller)[0]; |
249 | *{"${cpkg}::make_schema_at"} = \&make_schema_at; |
250 | } |
251 | } |
252 | } |
253 | |
254 | =head2 make_schema_at |
255 | |
256 | This simple function allows one to create a Loader-based schema |
257 | in-memory on the fly without any on-disk class files of any |
258 | kind. When used with the C<dump_directory> option, you can |
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259 | use this to generate a rough draft manual schema from a dsn |
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260 | without the intermediate step of creating a physical Loader-based |
261 | schema class. |
262 | |
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263 | The return value is the input class name. |
264 | |
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265 | This function can be exported/imported by the normal means, as |
266 | illustrated in these Examples: |
267 | |
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268 | # Simple example, creates as a new class 'New::Schema::Name' in |
269 | # memory in the running perl interpreter. |
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270 | use DBIx::Class::Schema::Loader qw/ make_schema_at /; |
271 | make_schema_at( |
272 | 'New::Schema::Name', |
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273 | { debug => 1 }, |
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274 | [ 'dbi:Pg:dbname="foo"','postgres' ], |
275 | ); |
276 | |
277 | # Complex: dump loaded schema to disk, all from the commandline: |
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278 | perl -MDBIx::Class::Schema::Loader=make_schema_at,dump_to_dir:./lib -e 'make_schema_at("New::Schema::Name", { debug => 1 }, [ "dbi:Pg:dbname=foo","postgres" ])' |
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279 | |
280 | # Same, but inside a script, and using a different way to specify the |
281 | # dump directory: |
282 | use DBIx::Class::Schema::Loader qw/ make_schema_at /; |
283 | make_schema_at( |
284 | 'New::Schema::Name', |
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285 | { debug => 1, dump_directory => './lib' }, |
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286 | [ 'dbi:Pg:dbname="foo"','postgres' ], |
287 | ); |
288 | |
289 | =cut |
290 | |
291 | sub make_schema_at { |
292 | my ($target, $opts, $connect_info) = @_; |
293 | |
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294 | { |
295 | no strict 'refs'; |
296 | @{$target . '::ISA'} = qw/DBIx::Class::Schema::Loader/; |
297 | } |
298 | |
299 | $target->loader_options($opts); |
300 | $target->connection(@$connect_info); |
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301 | } |
302 | |
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303 | =head2 rescan |
304 | |
305 | Re-scans the database for newly added tables since the initial |
306 | load, and adds them to the schema at runtime, including relationships, |
307 | etc. Does not process drops or changes. |
308 | |
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309 | Returns a list of the new monikers added. |
310 | |
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311 | =cut |
312 | |
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313 | sub rescan { my $self = shift; $self->_loader->rescan($self) } |
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314 | |
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315 | =head1 EXAMPLE |
316 | |
317 | Using the example in L<DBIx::Class::Manual::ExampleSchema> as a basis |
318 | replace the DB::Main with the following code: |
319 | |
320 | package DB::Main; |
321 | |
322 | use base qw/DBIx::Class::Schema::Loader/; |
323 | |
324 | __PACKAGE__->loader_options( |
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325 | debug => 1, |
326 | ); |
327 | __PACKAGE__->connection('dbi:SQLite:example.db'); |
328 | |
329 | 1; |
330 | |
331 | and remove the Main directory tree (optional). Every thing else |
332 | should work the same |
333 | |
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334 | =head1 KNOWN ISSUES |
335 | |
336 | =head2 Multiple Database Schemas |
337 | |
338 | Currently the loader is limited to working within a single schema |
339 | (using the database vendors' definition of "schema"). If you |
340 | have a multi-schema database with inter-schema relationships (which |
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341 | is easy to do in PostgreSQL or DB2 for instance), you only get to |
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342 | automatically load the tables of one schema, and any relationships |
343 | to tables in other schemas will be silently ignored. |
344 | |
345 | At some point in the future, an intelligent way around this might be |
346 | devised, probably by allowing the C<db_schema> option to be an |
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347 | arrayref of schemas to load. |
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348 | |
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349 | In "normal" L<DBIx::Class::Schema> usage, manually-defined |
350 | source classes and relationships have no problems crossing vendor schemas. |
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351 | |
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352 | =head1 AUTHOR |
353 | |
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354 | Brandon Black, C<blblack@gmail.com> |
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355 | |
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356 | Based on L<DBIx::Class::Loader> by Sebastian Riedel |
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357 | |
358 | Based upon the work of IKEBE Tomohiro |
359 | |
360 | =head1 THANK YOU |
361 | |
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362 | Matt S Trout, all of the #dbix-class folks, and everyone who's ever sent |
363 | in a bug report or suggestion. |
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364 | |
365 | =head1 LICENSE |
366 | |
367 | This library is free software; you can redistribute it and/or modify it under |
368 | the same terms as Perl itself. |
369 | |
370 | =head1 SEE ALSO |
371 | |
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372 | L<DBIx::Class>, L<DBIx::Class::Manual::ExampleSchema> |
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373 | |
374 | =cut |
375 | |
376 | 1; |