1 package SQL::Translator::Parser::XML::SQLFairy;
3 # -------------------------------------------------------------------
4 # Copyright (C) 2003 Mark Addison <mark.addison@itn.co.uk>,
5 # Copyright (C) 2009 Jonathan Yu <frequency@cpan.org>
7 # This program is free software; you can redistribute it and/or
8 # modify it under the terms of the GNU General Public License as
9 # published by the Free Software Foundation; version 2.
11 # This program is distributed in the hope that it will be useful, but
12 # WITHOUT ANY WARRANTY; without even the implied warranty of
13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 # General Public License for more details.
16 # You should have received a copy of the GNU General Public License
17 # along with this program; if not, write to the Free Software
18 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
20 # -------------------------------------------------------------------
24 SQL::Translator::Parser::XML::SQLFairy - parser for SQL::Translator's XML.
30 my $translator = SQL::Translator->new( show_warnings => 1 );
32 my $out = $obj->translate(
33 from => 'XML-SQLFairy',
35 filename => 'schema.xml',
36 ) or die $translator->error;
42 This parser handles the flavor of XML used natively by the SQLFairy
43 project (L<SQL::Translator>). The XML must be in the namespace
44 "http://sqlfairy.sourceforge.net/sqlfairy.xml."
45 See L<SQL::Translator::Producer::XML::SQLFairy> for details of this format.
47 You do not need to specify every attribute of the Schema objects as any missing
48 from the XML will be set to their default values. e.g. A field could be written
51 <sqlf:field name="email" data_type="varchar" size="255" />
55 <sqlf:field name="email" data_type="varchar" size="255" is_nullable="1"
56 is_auto_increment="0" is_primary_key="0" is_foreign_key="0" order="4">
57 <sqlf:comments></sqlf:comments>
60 If you do not explicitly set the order of items using order attributes on the
61 tags then the order the tags appear in the XML will be used.
65 Leave the attribute out all together to use the default in L<Schema::Field>.
66 Use empty quotes or 'EMPTY_STRING' for a zero lenth string. 'NULL' for an
67 explicit null (currently sets default_value to undef in the
70 <sqlf:field default_value="" /> <!-- Empty string -->
71 <sqlf:field default_value="EMPTY_STRING" /> <!-- Empty string -->
72 <sqlf:field default_value="NULL" /> <!-- NULL -->
76 Doesn't take any extra parser args at the moment.
80 The previous version of the SQLFairy XML allowed the attributes of the the
81 schema objects to be written as either xml attributes or as data elements, in
82 any combination. While this allows for lots of flexibility in writing the XML
83 the result is a great many possible XML formats, not so good for DTD writing,
84 XPathing etc! So we have moved to a fixed version described in
85 L<SQL::Translator::Producer::XML::SQLFairy>.
87 This version of the parser will still parse the old formats and emmit warnings
88 when it sees them being used but they should be considered B<heavily
91 To convert your old format files simply pass them through the translator :)
93 $ sqlt -f XML-SQLFairy -t XML-SQLFairy schema-old.xml > schema-new.xml
99 use vars qw[ $DEBUG $VERSION @EXPORT_OK ];
101 $DEBUG = 0 unless defined $DEBUG;
104 use Carp::Clan qw/^SQL::Translator/;
106 use base qw(Exporter);
107 @EXPORT_OK = qw(parse);
109 use base qw/SQL::Translator::Parser/; # Doesnt do anything at the mo!
110 use SQL::Translator::Utils 'debug';
111 use XML::LibXML 1.69;
112 use XML::LibXML::XPathContext;
115 my ( $translator, $data ) = @_;
116 my $schema = $translator->schema;
117 local $DEBUG = $translator->debug;
118 my $doc = XML::LibXML->new->parse_string($data);
119 my $xp = XML::LibXML::XPathContext->new($doc);
121 $xp->registerNs("sqlf", "http://sqlfairy.sourceforge.net/sqlfairy.xml");
124 # Work our way through the tables
126 my @nodes = $xp->findnodes(
127 '/sqlf:schema/sqlf:table|/sqlf:schema/sqlf:tables/sqlf:table'
131 ("".$xp->findvalue('sqlf:order|@order',$a) || 0)
133 ("".$xp->findvalue('sqlf:order|@order',$b) || 0)
136 debug "Adding table:".$xp->findvalue('sqlf:name',$tblnode);
138 my $table = $schema->add_table(
139 get_tagfields($xp, $tblnode, "sqlf:" => qw/name order extra/)
140 ) or die $schema->error;
145 my @nodes = $xp->findnodes('sqlf:fields/sqlf:field',$tblnode);
148 ("".$xp->findvalue('sqlf:order',$a) || 0)
150 ("".$xp->findvalue('sqlf:order',$b) || 0)
153 my %fdata = get_tagfields($xp, $_, "sqlf:",
154 qw/name data_type size default_value is_nullable extra
155 is_auto_increment is_primary_key is_foreign_key comments/
159 exists $fdata{'default_value'} and
160 defined $fdata{'default_value'}
162 if ( $fdata{'default_value'} =~ /^\s*NULL\s*$/ ) {
163 $fdata{'default_value'}= undef;
165 elsif ( $fdata{'default_value'} =~ /^\s*EMPTY_STRING\s*$/ ) {
166 $fdata{'default_value'} = "";
170 my $field = $table->add_field( %fdata ) or die $table->error;
172 $table->primary_key( $field->name ) if $fdata{'is_primary_key'};
176 # - We should be able to make the table obj spot this when
184 @nodes = $xp->findnodes('sqlf:constraints/sqlf:constraint',$tblnode);
186 my %data = get_tagfields($xp, $_, "sqlf:",
187 qw/name type table fields reference_fields reference_table
188 match_type on_delete on_update extra/
190 $table->add_constraint( %data ) or die $table->error;
196 @nodes = $xp->findnodes('sqlf:indices/sqlf:index',$tblnode);
198 my %data = get_tagfields($xp, $_, "sqlf:",
199 qw/name type fields options extra/);
200 $table->add_index( %data ) or die $table->error;
207 @nodes = $xp->findnodes('sqlf:comments/sqlf:comment',$tblnode);
209 my $data = $_->string_value;
210 $table->comments( $data );
218 @nodes = $xp->findnodes(
219 '/sqlf:schema/sqlf:view|/sqlf:schema/sqlf:views/sqlf:view'
222 my %data = get_tagfields($xp, $_, "sqlf:",
223 qw/name sql fields order extra/
225 $schema->add_view( %data ) or die $schema->error;
231 @nodes = $xp->findnodes(
232 '/sqlf:schema/sqlf:trigger|/sqlf:schema/sqlf:triggers/sqlf:trigger'
235 my %data = get_tagfields($xp, $_, "sqlf:", qw/
236 name perform_action_when database_event database_events fields
237 on_table action order extra
241 if (my $evt = $data{database_event} and $translator->{show_warnings}) {
242 carp 'The database_event tag is deprecated - please use ' .
243 'database_events (which can take one or more comma separated ' .
245 $data{database_events} = join (', ',
246 $data{database_events} || (),
251 # split into arrayref
252 if (my $evts = $data{database_events}) {
253 $data{database_events} = [split (/\s*,\s*/, $evts) ];
256 $schema->add_trigger( %data ) or die $schema->error;
262 @nodes = $xp->findnodes(
263 '/sqlf:schema/sqlf:procedure|/sqlf:schema/sqlf:procedures/sqlf:procedure'
266 my %data = get_tagfields($xp, $_, "sqlf:",
267 qw/name sql parameters owner comments order extra/
269 $schema->add_procedure( %data ) or die $schema->error;
277 # get_tagfields XP, NODE, NAMESPACE => qw/TAGNAMES/;
278 # get_tagfields $node, "sqlf:" => qw/name type fields reference/;
280 # Returns hash of data.
281 # TODO - Add handling of an explicit NULL value.
284 my ($xp, $node, @names) = @_;
287 if ( m/:$/ ) { $ns = $_; next; } # Set def namespace
288 my $thisns = (s/(^.*?:)// ? $1 : $ns);
290 my $is_attrib = m/^(sql|comments|action|extra)$/ ? 0 : 1;
292 my $attrib_path = "\@$_";
293 my $tag_path = "$thisns$_";
294 if ( my $found = $xp->find($attrib_path,$node) ) {
295 $data{$_} = "".$found->to_literal;
296 warn "Use of '$_' as an attribute is depricated."
297 ." Use a child tag instead."
298 ." To convert your file to the new version see the Docs.\n"
300 debug "Got $_=".( defined $data{ $_ } ? $data{ $_ } : 'UNDEF' );
302 elsif ( $found = $xp->find($tag_path,$node) ) {
305 foreach ( $found->pop->getAttributes ) {
306 $extra{$_->getName} = $_->getData;
311 $data{$_} = "".$found->to_literal;
313 warn "Use of '$_' as a child tag is depricated."
314 ." Use an attribute instead."
315 ." To convert your file to the new version see the Docs.\n"
317 debug "Got $_=".( defined $data{ $_ } ? $data{ $_ } : 'UNDEF' );
321 return wantarray ? %data : \%data;
330 Ignores the order attribute for Constraints, Views, Indices, Views, Triggers
331 and Procedures, using the tag order instead. (This is the order output by the
332 SQLFairy XML producer).
336 L<perl>, L<SQL::Translator>, L<SQL::Translator::Producer::XML::SQLFairy>,
337 L<SQL::Translator::Schema>.
345 Support options attribute.
349 Test foreign keys are parsed ok.
353 Control over defaulting.
359 Mark D. Addison E<lt>mark.addison@itn.co.ukE<gt>,
360 Jonathan Yu E<lt>frequency@cpan.orgE<gt>