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1 | package SQL::Translator::Parser::XML::SQLFairy; |
2 | |
3 | # ------------------------------------------------------------------- |
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4 | # $Id$ |
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5 | # ------------------------------------------------------------------- |
6 | # Copyright (C) 2003 Mark Addison <mark.addison@itn.co.uk>, |
7 | # |
8 | # This program is free software; you can redistribute it and/or |
9 | # modify it under the terms of the GNU General Public License as |
10 | # published by the Free Software Foundation; version 2. |
11 | # |
12 | # This program is distributed in the hope that it will be useful, but |
13 | # WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
15 | # General Public License for more details. |
16 | # |
17 | # You should have received a copy of the GNU General Public License |
18 | # along with this program; if not, write to the Free Software |
19 | # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
20 | # 02111-1307 USA |
21 | # ------------------------------------------------------------------- |
22 | |
23 | =head1 NAME |
24 | |
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25 | SQL::Translator::Parser::XML::SQLFairy - parser for SQL::Translator's XML. |
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26 | |
27 | =head1 SYNOPSIS |
28 | |
29 | use SQL::Translator; |
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30 | |
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31 | my $translator = SQL::Translator->new( show_warnings => 1 ); |
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32 | |
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33 | my $out = $obj->translate( |
34 | from => 'XML-SQLFairy', |
35 | to => 'MySQL', |
36 | filename => 'schema.xml', |
37 | ) or die $translator->error; |
38 | |
39 | print $out; |
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40 | |
41 | =head1 DESCRIPTION |
42 | |
43 | This parser handles the flavor of XML used natively by the SQLFairy |
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44 | project (L<SQL::Translator>). The XML must be in the namespace |
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45 | "http://sqlfairy.sourceforge.net/sqlfairy.xml." |
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46 | See L<SQL::Translator::Producer::XML::SQLFairy> for details of this format. |
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47 | |
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48 | You do not need to specify every attribute of the Schema objects as any missing |
49 | from the XML will be set to their default values. e.g. A field could be written |
50 | using only; |
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51 | |
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52 | <sqlf:field name="email" data_type="varchar" size="255" /> |
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53 | |
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54 | Instead of the full; |
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55 | |
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56 | <sqlf:field name="email" data_type="varchar" size="255" is_nullable="1" |
57 | is_auto_increment="0" is_primary_key="0" is_foreign_key="0" order="4"> |
58 | <sqlf:comments></sqlf:comments> |
59 | </sqlf:field> |
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60 | |
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61 | If you do not explicitly set the order of items using order attributes on the |
62 | tags then the order the tags appear in the XML will be used. |
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63 | |
64 | =head2 default_value |
65 | |
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66 | Leave the attribute out all together to use the default in L<Schema::Field>. |
67 | Use empty quotes or 'EMPTY_STRING' for a zero lenth string. 'NULL' for an |
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68 | explicit null (currently sets default_value to undef in the |
69 | Schema::Field obj). |
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70 | |
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71 | <sqlf:field default_value="" /> <!-- Empty string --> |
72 | <sqlf:field default_value="EMPTY_STRING" /> <!-- Empty string --> |
73 | <sqlf:field default_value="NULL" /> <!-- NULL --> |
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74 | |
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75 | =head2 ARGS |
76 | |
77 | Doesn't take any extra parser args at the moment. |
78 | |
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79 | =head1 LEGACY FORMAT |
80 | |
81 | The previous version of the SQLFairy XML allowed the attributes of the the |
82 | schema objects to be written as either xml attributes or as data elements, in |
83 | any combination. While this allows for lots of flexibility in writing the XML |
84 | the result is a great many possible XML formats, not so good for DTD writing, |
85 | XPathing etc! So we have moved to a fixed version described in |
86 | L<SQL::Translator::Producer::XML::SQLFairy>. |
87 | |
88 | This version of the parser will still parse the old formats and emmit warnings |
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89 | when it sees them being used but they should be considered B<heavily |
90 | depreciated>. |
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91 | |
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92 | To convert your old format files simply pass them through the translator :) |
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93 | |
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94 | $ sqlt -f XML-SQLFairy -t XML-SQLFairy schema-old.xml > schema-new.xml |
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95 | |
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96 | =cut |
97 | |
98 | # ------------------------------------------------------------------- |
99 | |
100 | use strict; |
101 | |
102 | use vars qw[ $DEBUG $VERSION @EXPORT_OK ]; |
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103 | $VERSION = sprintf "%d.%02d", q$Revision$ =~ /(\d+)\.(\d+)/; |
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104 | $DEBUG = 0 unless defined $DEBUG; |
105 | |
106 | use Data::Dumper; |
107 | use Exporter; |
108 | use base qw(Exporter); |
109 | @EXPORT_OK = qw(parse); |
110 | |
111 | use base qw/SQL::Translator::Parser/; # Doesnt do anything at the mo! |
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112 | use SQL::Translator::Utils 'debug'; |
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113 | use XML::XPath; |
114 | use XML::XPath::XMLParser; |
115 | |
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116 | sub parse { |
117 | my ( $translator, $data ) = @_; |
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118 | my $schema = $translator->schema; |
119 | local $DEBUG = $translator->debug; |
120 | my $xp = XML::XPath->new(xml => $data); |
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121 | |
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122 | $xp->set_namespace("sqlf", "http://sqlfairy.sourceforge.net/sqlfairy.xml"); |
123 | |
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124 | # |
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125 | # Work our way through the tables |
126 | # |
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127 | my @nodes = $xp->findnodes( |
128 | '/sqlf:schema/sqlf:table|/sqlf:schema/sqlf:tables/sqlf:table' |
129 | ); |
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130 | for my $tblnode ( |
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131 | sort { |
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132 | ("".$xp->findvalue('sqlf:order|@order',$a) || 0) |
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133 | <=> |
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134 | ("".$xp->findvalue('sqlf:order|@order',$b) || 0) |
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135 | } @nodes |
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136 | ) { |
137 | debug "Adding table:".$xp->findvalue('sqlf:name',$tblnode); |
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138 | |
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139 | my $table = $schema->add_table( |
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140 | get_tagfields($xp, $tblnode, "sqlf:" => qw/name order extra/) |
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141 | ) or die $schema->error; |
142 | |
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143 | # |
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144 | # Fields |
145 | # |
146 | my @nodes = $xp->findnodes('sqlf:fields/sqlf:field',$tblnode); |
147 | foreach ( |
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148 | sort { |
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149 | ("".$xp->findvalue('sqlf:order',$a) || 0) |
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150 | <=> |
151 | ("".$xp->findvalue('sqlf:order',$b) || 0) |
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152 | } @nodes |
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153 | ) { |
154 | my %fdata = get_tagfields($xp, $_, "sqlf:", |
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155 | qw/name data_type size default_value is_nullable extra |
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156 | is_auto_increment is_primary_key is_foreign_key comments/ |
157 | ); |
158 | |
159 | if ( |
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160 | exists $fdata{'default_value'} and |
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161 | defined $fdata{'default_value'} |
162 | ) { |
163 | if ( $fdata{'default_value'} =~ /^\s*NULL\s*$/ ) { |
164 | $fdata{'default_value'}= undef; |
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165 | } |
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166 | elsif ( $fdata{'default_value'} =~ /^\s*EMPTY_STRING\s*$/ ) { |
167 | $fdata{'default_value'} = ""; |
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168 | } |
169 | } |
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170 | |
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171 | my $field = $table->add_field( %fdata ) or die $table->error; |
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172 | |
173 | $table->primary_key( $field->name ) if $fdata{'is_primary_key'}; |
174 | |
175 | # |
176 | # TODO: |
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177 | # - We should be able to make the table obj spot this when |
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178 | # we use add_field. |
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179 | # |
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180 | } |
181 | |
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182 | # |
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183 | # Constraints |
184 | # |
185 | @nodes = $xp->findnodes('sqlf:constraints/sqlf:constraint',$tblnode); |
186 | foreach (@nodes) { |
187 | my %data = get_tagfields($xp, $_, "sqlf:", |
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188 | qw/name type table fields reference_fields reference_table |
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189 | match_type on_delete on_update extra/ |
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190 | ); |
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191 | $table->add_constraint( %data ) or die $table->error; |
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192 | } |
193 | |
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194 | # |
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195 | # Indexes |
196 | # |
197 | @nodes = $xp->findnodes('sqlf:indices/sqlf:index',$tblnode); |
198 | foreach (@nodes) { |
199 | my %data = get_tagfields($xp, $_, "sqlf:", |
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200 | qw/name type fields options extra/); |
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201 | $table->add_index( %data ) or die $table->error; |
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202 | } |
203 | |
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204 | |
205 | # |
206 | # Comments |
207 | # |
208 | @nodes = $xp->findnodes('sqlf:comments/sqlf:comment',$tblnode); |
209 | foreach (@nodes) { |
210 | my $data = $_->string_value; |
211 | $table->comments( $data ); |
212 | } |
213 | |
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214 | } # tables loop |
215 | |
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216 | # |
217 | # Views |
218 | # |
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219 | @nodes = $xp->findnodes( |
220 | '/sqlf:schema/sqlf:view|/sqlf:schema/sqlf:views/sqlf:view' |
221 | ); |
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222 | foreach (@nodes) { |
223 | my %data = get_tagfields($xp, $_, "sqlf:", |
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224 | qw/name sql fields order extra/ |
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225 | ); |
226 | $schema->add_view( %data ) or die $schema->error; |
227 | } |
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228 | |
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229 | # |
230 | # Triggers |
231 | # |
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232 | @nodes = $xp->findnodes( |
233 | '/sqlf:schema/sqlf:trigger|/sqlf:schema/sqlf:triggers/sqlf:trigger' |
234 | ); |
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235 | foreach (@nodes) { |
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236 | my %data = get_tagfields($xp, $_, "sqlf:", qw/ |
237 | name perform_action_when database_event fields on_table action order |
238 | extra |
239 | /); |
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240 | $schema->add_trigger( %data ) or die $schema->error; |
241 | } |
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242 | |
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243 | # |
244 | # Procedures |
245 | # |
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246 | @nodes = $xp->findnodes( |
247 | '/sqlf:schema/sqlf:procedure|/sqlf:schema/sqlf:procedures/sqlf:procedure' |
248 | ); |
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249 | foreach (@nodes) { |
250 | my %data = get_tagfields($xp, $_, "sqlf:", |
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251 | qw/name sql parameters owner comments order extra/ |
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252 | ); |
253 | $schema->add_procedure( %data ) or die $schema->error; |
254 | } |
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255 | |
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256 | return 1; |
257 | } |
258 | |
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259 | # ------------------------------------------------------------------- |
260 | sub get_tagfields { |
261 | # |
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262 | # get_tagfields XP, NODE, NAMESPACE => qw/TAGNAMES/; |
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263 | # get_tagfields $node, "sqlf:" => qw/name type fields reference/; |
264 | # |
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265 | # Returns hash of data. |
266 | # TODO - Add handling of an explicit NULL value. |
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267 | # |
268 | |
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269 | my ($xp, $node, @names) = @_; |
270 | my (%data, $ns); |
271 | foreach (@names) { |
272 | if ( m/:$/ ) { $ns = $_; next; } # Set def namespace |
273 | my $thisns = (s/(^.*?:)// ? $1 : $ns); |
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274 | |
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275 | my $is_attrib = m/^(sql|comments|action|extra)$/ ? 0 : 1; |
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276 | |
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277 | my $attrib_path = "\@$thisns$_"; |
278 | my $tag_path = "$thisns$_"; |
279 | if ( $xp->exists($attrib_path,$node) ) { |
280 | $data{$_} = "".$xp->findvalue($attrib_path,$node); |
281 | warn "Use of '$_' as an attribute is depricated." |
282 | ." Use a child tag instead." |
283 | ." To convert your file to the new version see the Docs.\n" |
284 | unless $is_attrib; |
285 | debug "Got $_=".( defined $data{ $_ } ? $data{ $_ } : 'UNDEF' ); |
286 | } |
287 | elsif ( $xp->exists($tag_path,$node) ) { |
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288 | if ($_ eq "extra") { |
289 | my %extra; |
290 | my $extra_nodes = $xp->find($tag_path,$node); |
291 | foreach ( $extra_nodes->pop->getAttributes ) { |
292 | $extra{$_->getName} = $_->getData; |
293 | } |
294 | $data{$_} = \%extra; |
295 | } |
296 | else { |
297 | $data{$_} = "".$xp->findvalue($tag_path,$node); |
298 | } |
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299 | warn "Use of '$_' as a child tag is depricated." |
300 | ." Use an attribute instead." |
301 | ." To convert your file to the new version see the Docs.\n" |
302 | if $is_attrib; |
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303 | debug "Got $_=".( defined $data{ $_ } ? $data{ $_ } : 'UNDEF' ); |
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304 | } |
305 | } |
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306 | |
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307 | return wantarray ? %data : \%data; |
308 | } |
309 | |
310 | 1; |
311 | |
312 | # ------------------------------------------------------------------- |
313 | |
314 | =pod |
315 | |
316 | =head1 BUGS |
317 | |
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318 | Ignores the order attribute for Constraints, Views, Indices, |
319 | Views, Triggers and Procedures, using the tag order instead. (This is the order |
320 | output by the SQLFairy XML producer). |
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321 | |
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322 | =head1 SEE ALSO |
323 | |
324 | L<perl>, L<SQL::Translator>, L<SQL::Translator::Producer::XML::SQLFairy>, |
325 | L<SQL::Translator::Schema>. |
326 | |
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327 | =head1 TODO |
328 | |
329 | =over 4 |
330 | |
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331 | =item * |
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332 | |
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333 | Support options attribute. |
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334 | |
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335 | =item * |
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336 | |
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337 | Test foreign keys are parsed ok. |
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338 | |
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339 | =item * |
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340 | |
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341 | Control over defaulting. |
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342 | |
343 | =back |
344 | |
345 | =head1 AUTHOR |
346 | |
347 | Mark D. Addison E<lt>mark.addison@itn.co.ukE<gt>. |
348 | |
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349 | =cut |