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1 | package SQL::Translator::Producer::XML::SQLFairy; |
2 | |
3 | # ------------------------------------------------------------------- |
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4 | # $Id: SQLFairy.pm,v 1.17 2004-08-19 14:09:00 grommit Exp $ |
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5 | # ------------------------------------------------------------------- |
6 | # Copyright (C) 2003 Ken Y. Clark <kclark@cpan.org>, |
7 | # darren chamberlain <darren@cpan.org>, |
8 | # Chris Mungall <cjm@fruitfly.org>, |
9 | # Mark Addison <mark.addison@itn.co.uk>. |
10 | # |
11 | # This program is free software; you can redistribute it and/or |
12 | # modify it under the terms of the GNU General Public License as |
13 | # published by the Free Software Foundation; version 2. |
14 | # |
15 | # This program is distributed in the hope that it will be useful, but |
16 | # WITHOUT ANY WARRANTY; without even the implied warranty of |
17 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
18 | # General Public License for more details. |
19 | # |
20 | # You should have received a copy of the GNU General Public License |
21 | # along with this program; if not, write to the Free Software |
22 | # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
23 | # 02111-1307 USA |
24 | # ------------------------------------------------------------------- |
25 | |
26 | =pod |
27 | |
28 | =head1 NAME |
29 | |
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30 | SQL::Translator::Producer::XML::SQLFairy - SQLFairy's default XML format |
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31 | |
32 | =head1 SYNOPSIS |
33 | |
34 | use SQL::Translator; |
35 | |
36 | my $t = SQL::Translator->new( |
37 | from => 'MySQL', |
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38 | to => 'XML-SQLFairy', |
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39 | filename => 'schema.sql', |
40 | show_warnings => 1, |
41 | add_drop_table => 1, |
42 | ); |
43 | |
44 | print $t->translate; |
45 | |
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46 | =head1 DESCRIPTION |
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47 | |
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48 | Creates XML output of a schema, in SQLFairy format XML. |
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49 | |
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50 | The XML lives in the http://sqlfairy.sourceforge.net/sqlfairy.xml namespace. |
51 | With a root element of <schema>. |
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52 | |
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53 | Objects in the schema are mapped to tags of the same name as the objects class. |
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54 | |
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55 | The attributes of the objects (e.g. $field->name) are mapped to attributes of |
56 | the tag, except for sql, comments and action, which get mapped to child data |
57 | elements. |
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58 | |
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59 | List valued attributes (such as the list of fields in an index) |
60 | get mapped to a comma seperated list of values in the attribute. |
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61 | |
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62 | Child objects, such as a tables fields, get mapped to child tags wrapped in a |
63 | set of container tags using the plural of their contained classes name. |
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64 | |
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65 | L<SQL::Translator::Schema::Field>'s extra attribute (a hash of arbitary data) is |
66 | mapped to a tag called extra, with the hash of data as attributes, sorted into |
67 | alphabetical order. |
68 | |
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69 | e.g. |
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70 | |
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71 | <schema name="" database="" |
72 | xmlns="http://sqlfairy.sourceforge.net/sqlfairy.xml"> |
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73 | |
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74 | <table name="Story" order="1"> |
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75 | |
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76 | <fields> |
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77 | <field name="id" data_type="BIGINT" size="20" |
78 | is_nullable="0" is_auto_increment="1" is_primary_key="1" |
79 | is_foreign_key="0" order="3"> |
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80 | <extra ZEROFILL="1" /> |
81 | <comments></comments> |
82 | </field> |
83 | <field name="created" data_type="datetime" size="0" |
84 | is_nullable="1" is_auto_increment="0" is_primary_key="0" |
85 | is_foreign_key="0" order="1"> |
86 | <extra /> |
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87 | <comments></comments> |
88 | </field> |
89 | ... |
90 | </fields> |
91 | |
92 | <indices> |
93 | <index name="foobar" type="NORMAL" fields="foo,bar" options="" /> |
94 | </indices> |
95 | |
96 | </table> |
97 | |
98 | <view name="email_list" fields="email" order="1"> |
99 | <sql>SELECT email FROM Basic WHERE email IS NOT NULL</sql> |
100 | </view> |
101 | |
102 | </schema> |
103 | |
104 | To see a complete example of the XML translate one of your schema :) |
105 | |
106 | $ sqlt -f MySQL -t XML-SQLFairy schema.sql |
107 | |
108 | =head1 ARGS |
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109 | |
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110 | =over 4 |
111 | |
112 | =item add_prefix |
113 | |
114 | Set to true to use the default namespace prefix of 'sqlf', instead of using |
115 | the default namespace for |
116 | C<http://sqlfairy.sourceforge.net/sqlfairy.xml namespace> |
117 | |
118 | e.g. |
119 | |
120 | <!-- add_prefix=0 --> |
121 | <field name="foo" /> |
122 | |
123 | <!-- add_prefix=1 --> |
124 | <sqlf:field name="foo" /> |
125 | |
126 | =item prefix |
127 | |
128 | Set to the namespace prefix you want to use for the |
129 | C<http://sqlfairy.sourceforge.net/sqlfairy.xml namespace> |
130 | |
131 | e.g. |
132 | |
133 | <!-- prefix='foo' --> |
134 | <foo:field name="foo" /> |
135 | |
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136 | =item newlines |
137 | |
138 | If true (the default) inserts newlines around the XML, otherwise the schema is |
139 | written on one line. |
140 | |
141 | =item indent |
142 | |
143 | When using newlines the number of whitespace characters to use as the indent. |
144 | Default is 2, set to 0 to turn off indenting. |
145 | |
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146 | =back |
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147 | |
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148 | =head1 LEGACY FORMAT |
149 | |
150 | The previous version of the SQLFairy XML allowed the attributes of the the |
151 | schema objects to be written as either xml attributes or as data elements, in |
152 | any combination. The old producer could produce attribute only or data element |
153 | only versions. While this allowed for lots of flexibility in writing the XML |
154 | the result is a great many possible XML formats, not so good for DTD writing, |
155 | XPathing etc! So we have moved to a fixed version described above. |
156 | |
157 | This version of the producer will now only produce the new style XML. |
158 | To convert your old format files simply pass them through the translator; |
159 | |
160 | sqlt -f XML-SQLFairy -t XML-SQLFairy schema-old.xml > schema-new.xml |
161 | |
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162 | =cut |
163 | |
164 | use strict; |
165 | use vars qw[ $VERSION @EXPORT_OK ]; |
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166 | $VERSION = sprintf "%d.%02d", q$Revision: 1.17 $ =~ /(\d+)\.(\d+)/; |
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167 | |
168 | use Exporter; |
169 | use base qw(Exporter); |
170 | @EXPORT_OK = qw(produce); |
171 | |
172 | use IO::Scalar; |
173 | use SQL::Translator::Utils qw(header_comment debug); |
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174 | BEGIN { |
175 | # Will someone fix XML::Writer already? |
176 | local $^W = 0; |
177 | require XML::Writer; |
178 | import XML::Writer; |
179 | } |
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180 | |
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181 | # Which schema object attributes (methods) to write as xml elements rather than |
182 | # as attributes. e.g. <comments>blah, blah...</comments> |
183 | my @MAP_AS_ELEMENTS = qw/sql comments action extra/; |
184 | |
185 | |
186 | |
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187 | my $Namespace = 'http://sqlfairy.sourceforge.net/sqlfairy.xml'; |
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188 | my $Name = 'sqlf'; |
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189 | my $PArgs = {}; |
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190 | |
191 | sub produce { |
192 | my $translator = shift; |
193 | my $schema = $translator->schema; |
194 | $PArgs = $translator->producer_args; |
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195 | my $newlines = defined $PArgs->{newlines} ? $PArgs->{newlines} : 1; |
196 | my $indent = defined $PArgs->{indent} ? $PArgs->{indent} : 2; |
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197 | my $io = IO::Scalar->new; |
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198 | |
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199 | # Setup the XML::Writer and set the namespace |
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200 | my $prefix = ""; |
201 | $prefix = $Name if $PArgs->{add_prefix}; |
202 | $prefix = $PArgs->{prefix} if $PArgs->{prefix}; |
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203 | my $xml = XML::Writer->new( |
204 | OUTPUT => $io, |
205 | NAMESPACES => 1, |
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206 | PREFIX_MAP => { $Namespace => $prefix }, |
207 | DATA_MODE => $newlines, |
208 | DATA_INDENT => $indent, |
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209 | ); |
210 | |
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211 | # Start the document |
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212 | $xml->xmlDecl('UTF-8'); |
213 | $xml->comment(header_comment('', '')); |
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214 | xml_obj($xml, $schema, |
215 | tag => "schema", methods => [qw/name database/], end_tag => 0 ); |
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216 | |
217 | # |
218 | # Table |
219 | # |
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220 | $xml->startTag( [ $Namespace => "tables" ] ); |
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221 | for my $table ( $schema->get_tables ) { |
222 | debug "Table:",$table->name; |
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223 | xml_obj($xml, $table, |
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224 | tag => "table", |
225 | methods => [qw/name order/], |
226 | end_tag => 0 |
227 | ); |
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228 | |
229 | # |
230 | # Fields |
231 | # |
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232 | xml_obj_children( $xml, $table, |
233 | tag => 'field', |
234 | methods =>[qw/ |
235 | name data_type size is_nullable default_value is_auto_increment |
236 | is_primary_key is_foreign_key extra comments order |
237 | /], |
238 | ); |
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239 | |
240 | # |
241 | # Indices |
242 | # |
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243 | xml_obj_children( $xml, $table, |
244 | tag => 'index', |
245 | collection_tag => "indices", |
246 | methods => [qw/name type fields options/], |
247 | ); |
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248 | |
249 | # |
250 | # Constraints |
251 | # |
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252 | xml_obj_children( $xml, $table, |
253 | tag => 'constraint', |
254 | methods => [qw/ |
255 | name type fields reference_table reference_fields |
256 | on_delete on_update match_type expression options deferrable |
257 | /], |
258 | ); |
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259 | |
260 | $xml->endTag( [ $Namespace => 'table' ] ); |
261 | } |
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262 | $xml->endTag( [ $Namespace => 'tables' ] ); |
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263 | |
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264 | # |
265 | # Views |
266 | # |
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267 | xml_obj_children( $xml, $schema, |
268 | tag => 'view', |
269 | methods => [qw/name sql fields order/], |
270 | ); |
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271 | |
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272 | # |
273 | # Tiggers |
274 | # |
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275 | xml_obj_children( $xml, $schema, |
276 | tag => 'trigger', |
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277 | methods => [qw/name database_event action on_table perform_action_when |
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278 | fields order/], |
279 | ); |
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280 | |
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281 | # |
282 | # Procedures |
283 | # |
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284 | xml_obj_children( $xml, $schema, |
285 | tag => 'procedure', |
286 | methods => [qw/name sql parameters owner comments order/], |
287 | ); |
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288 | |
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289 | $xml->endTag([ $Namespace => 'schema' ]); |
290 | $xml->end; |
291 | |
292 | return $io; |
293 | } |
294 | |
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295 | |
296 | # |
297 | # Takes and XML::Write object, Schema::* parent object, the tag name, |
298 | # the collection name and a list of methods (of the children) to write as XML. |
299 | # The collection name defaults to the name with an s on the end and is used to |
300 | # work out the method to get the children with. eg a name of 'foo' gives a |
301 | # collection of foos and gets the members using ->get_foos. |
302 | # |
303 | sub xml_obj_children { |
304 | my ($xml,$parent) = (shift,shift); |
305 | my %args = @_; |
306 | my ($name,$collection_name,$methods) |
307 | = @args{qw/tag collection_tag methods/}; |
308 | $collection_name ||= "${name}s"; |
309 | my $meth = "get_$collection_name"; |
310 | |
311 | my @kids = $parent->$meth; |
312 | #@kids || return; |
313 | $xml->startTag( [ $Namespace => $collection_name ] ); |
314 | for my $obj ( @kids ) { |
315 | xml_obj($xml, $obj, |
316 | tag => "$name", |
317 | end_tag => 1, |
318 | methods => $methods, |
319 | ); |
320 | } |
321 | $xml->endTag( [ $Namespace => $collection_name ] ); |
322 | } |
323 | |
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324 | # |
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325 | # Takes an XML::Writer, Schema::* object and list of method names |
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326 | # and writes the obect out as XML. All methods values are written as attributes |
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327 | # except for the methods listed in @MAP_AS_ELEMENTS which get written as child |
328 | # data elements. |
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329 | # |
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330 | # The attributes/tags are written in the same order as the method names are |
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331 | # passed. |
332 | # |
333 | # TODO |
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334 | # - Should the Namespace be passed in instead of global? Pass in the same |
335 | # as Writer ie [ NS => TAGNAME ] |
336 | # |
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337 | my $elements_re = join("|", @MAP_AS_ELEMENTS); |
338 | $elements_re = qr/^($elements_re)$/; |
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339 | sub xml_obj { |
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340 | my ($xml, $obj, %args) = @_; |
341 | my $tag = $args{'tag'} || ''; |
342 | my $end_tag = $args{'end_tag'} || ''; |
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343 | my @meths = @{ $args{'methods'} }; |
344 | my $empty_tag = 0; |
345 | |
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346 | # Use array to ensure consistant (ie not hash) ordering of attribs |
347 | # The order comes from the meths list passed in. |
348 | my @tags; |
349 | my @attr; |
350 | foreach ( grep { defined $obj->$_ } @meths ) { |
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351 | my $what = m/$elements_re/ ? \@tags : \@attr; |
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352 | my $val = $_ eq 'extra' |
353 | ? { $obj->$_ } |
354 | : $obj->$_; |
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355 | $val = ref $val eq 'ARRAY' ? join(',', @$val) : $val; |
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356 | push @$what, $_ => $val; |
357 | }; |
358 | my $child_tags = @tags; |
359 | $end_tag && !$child_tags |
360 | ? $xml->emptyTag( [ $Namespace => $tag ], @attr ) |
361 | : $xml->startTag( [ $Namespace => $tag ], @attr ); |
362 | while ( my ($name,$val) = splice @tags,0,2 ) { |
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363 | if ( ref $val eq 'HASH' ) { |
364 | $xml->emptyTag( [ $Namespace => $name ], |
365 | map { ($_, $val->{$_}) } sort keys %$val ); |
366 | } |
367 | else { |
368 | $xml->dataElement( [ $Namespace => $name ], $val ); |
369 | } |
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370 | } |
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371 | $xml->endTag( [ $Namespace => $tag ] ) if $child_tags && $end_tag; |
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372 | } |
373 | |
374 | 1; |
375 | |
376 | # ------------------------------------------------------------------- |
377 | # The eyes of fire, the nostrils of air, |
378 | # The mouth of water, the beard of earth. |
379 | # William Blake |
380 | # ------------------------------------------------------------------- |
381 | |
382 | =pod |
383 | |
384 | =head1 AUTHORS |
385 | |
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386 | Ken Y. Clark E<lt>kclark@cpan.orgE<gt>, |
387 | Darren Chamberlain E<lt>darren@cpan.orgE<gt>, |
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388 | Mark Addison E<lt>mark.addison@itn.co.ukE<gt>. |
389 | |
390 | =head1 SEE ALSO |
391 | |
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392 | perl(1), SQL::Translator, SQL::Translator::Parser::XML::SQLFairy, |
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393 | SQL::Translator::Schema, XML::Writer. |
394 | |
395 | =cut |