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1 | package SQL::Translator::Parser::XML::SQLFairy; |
2 | |
3 | # ------------------------------------------------------------------- |
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4 | # $Id: SQLFairy.pm,v 1.6 2004-07-08 19:06:24 grommit Exp $ |
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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; |
30 | use SQL::Translator::Parser::XML::SQLFairy; |
31 | |
32 | my $translator = SQL::Translator->new( |
33 | from => 'XML-SQLFairy', |
34 | to => 'MySQL', |
35 | filename => 'schema.xml', |
36 | show_warnings => 1, |
37 | add_drop_table => 1, |
38 | ); |
39 | |
40 | print $obj->translate; |
41 | |
42 | =head1 DESCRIPTION |
43 | |
44 | This parser handles the flavor of XML used natively by the SQLFairy |
45 | project (SQL::Translator). The XML must be in the namespace |
46 | "http://sqlfairy.sourceforge.net/sqlfairy.xml." |
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47 | See L<SQL::Translator::Producer::XML::SQLFairy> for details of this format. |
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48 | |
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49 | You do not need to specify every attribute of the Schema objects as any missing |
50 | from the XML will be set to their default values. e.g. A field could be written |
51 | using only; |
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52 | |
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53 | <sqlf:field name="email" data_type="varchar" size="255" /> |
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54 | |
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55 | Instead of the full; |
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56 | |
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57 | <sqlf:field name="email" data_type="varchar" size="255" is_nullable="1" |
58 | is_auto_increment="0" is_primary_key="0" is_foreign_key="0" order="4"> |
59 | <sqlf:comments></sqlf:comments> |
60 | </sqlf:field> |
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61 | |
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62 | If you do not explicitly set the order of items using order attributes on the |
63 | tags then the order the tags appear in the XML will be used. |
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64 | |
65 | =head2 default_value |
66 | |
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67 | Leave the tag out all together to use the default in Schema::Field. |
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68 | Use empty tags or 'EMPTY_STRING' for a zero lenth string. 'NULL' for an |
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69 | explicit null (currently sets default_value to undef in the |
70 | Schema::Field obj). |
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71 | |
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72 | <sqlf:default_value></sqlf:default_value> <!-- Empty string --> |
73 | <sqlf:default_value>EMPTY_STRING</sqlf:default_value> <!-- Empty string --> |
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74 | <sqlf:default_value/> <!-- Empty string --> |
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75 | <sqlf:default_value>NULL</sqlf:default_value> <!-- NULL --> |
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76 | |
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77 | =head2 ARGS |
78 | |
79 | Doesn't take any extra parser args at the moment. |
80 | |
81 | =cut |
82 | |
83 | # ------------------------------------------------------------------- |
84 | |
85 | use strict; |
86 | |
87 | use vars qw[ $DEBUG $VERSION @EXPORT_OK ]; |
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88 | $VERSION = sprintf "%d.%02d", q$Revision: 1.6 $ =~ /(\d+)\.(\d+)/; |
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89 | $DEBUG = 0 unless defined $DEBUG; |
90 | |
91 | use Data::Dumper; |
92 | use Exporter; |
93 | use base qw(Exporter); |
94 | @EXPORT_OK = qw(parse); |
95 | |
96 | use base qw/SQL::Translator::Parser/; # Doesnt do anything at the mo! |
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97 | use SQL::Translator::Utils 'debug'; |
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98 | use XML::XPath; |
99 | use XML::XPath::XMLParser; |
100 | |
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101 | sub parse { |
102 | my ( $translator, $data ) = @_; |
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103 | my $schema = $translator->schema; |
104 | local $DEBUG = $translator->debug; |
105 | my $xp = XML::XPath->new(xml => $data); |
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106 | |
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107 | $xp->set_namespace("sqlf", "http://sqlfairy.sourceforge.net/sqlfairy.xml"); |
108 | |
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109 | # |
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110 | # Work our way through the tables |
111 | # |
112 | my @nodes = $xp->findnodes('/sqlf:schema/sqlf:table'); |
113 | for my $tblnode ( |
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114 | sort { |
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115 | "".$xp->findvalue('sqlf:order|@order',$a) |
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116 | <=> |
117 | "".$xp->findvalue('sqlf:order|@order',$b) |
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118 | } @nodes |
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119 | ) { |
120 | debug "Adding table:".$xp->findvalue('sqlf:name',$tblnode); |
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121 | |
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122 | my $table = $schema->add_table( |
123 | get_tagfields($xp, $tblnode, "sqlf:" => qw/name order/) |
124 | ) or die $schema->error; |
125 | |
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126 | # |
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127 | # Fields |
128 | # |
129 | my @nodes = $xp->findnodes('sqlf:fields/sqlf:field',$tblnode); |
130 | foreach ( |
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131 | sort { |
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132 | ("".$xp->findvalue('sqlf:order',$a) || 0) |
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133 | <=> |
134 | ("".$xp->findvalue('sqlf:order',$b) || 0) |
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135 | } @nodes |
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136 | ) { |
137 | my %fdata = get_tagfields($xp, $_, "sqlf:", |
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138 | qw/name data_type size default_value is_nullable |
139 | is_auto_increment is_primary_key is_foreign_key comments/ |
140 | ); |
141 | |
142 | if ( |
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143 | exists $fdata{'default_value'} and |
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144 | defined $fdata{'default_value'} |
145 | ) { |
146 | if ( $fdata{'default_value'} =~ /^\s*NULL\s*$/ ) { |
147 | $fdata{'default_value'}= undef; |
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148 | } |
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149 | elsif ( $fdata{'default_value'} =~ /^\s*EMPTY_STRING\s*$/ ) { |
150 | $fdata{'default_value'} = ""; |
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151 | } |
152 | } |
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153 | |
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154 | my $field = $table->add_field( %fdata ) or die $table->error; |
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155 | |
156 | $table->primary_key( $field->name ) if $fdata{'is_primary_key'}; |
157 | |
158 | # |
159 | # TODO: |
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160 | # - We should be able to make the table obj spot this when |
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161 | # we use add_field. |
162 | # - Deal with $field->extra |
163 | # |
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164 | } |
165 | |
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166 | # |
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167 | # Constraints |
168 | # |
169 | @nodes = $xp->findnodes('sqlf:constraints/sqlf:constraint',$tblnode); |
170 | foreach (@nodes) { |
171 | my %data = get_tagfields($xp, $_, "sqlf:", |
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172 | qw/name type table fields reference_fields reference_table |
173 | match_type on_delete_do on_update_do/ |
174 | ); |
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175 | $table->add_constraint( %data ) or die $table->error; |
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176 | } |
177 | |
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178 | # |
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179 | # Indexes |
180 | # |
181 | @nodes = $xp->findnodes('sqlf:indices/sqlf:index',$tblnode); |
182 | foreach (@nodes) { |
183 | my %data = get_tagfields($xp, $_, "sqlf:", |
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184 | qw/name type fields options/); |
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185 | $table->add_index( %data ) or die $table->error; |
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186 | } |
187 | |
188 | } # tables loop |
189 | |
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190 | # |
191 | # Views |
192 | # |
193 | @nodes = $xp->findnodes('/sqlf:schema/sqlf:view'); |
194 | foreach (@nodes) { |
195 | my %data = get_tagfields($xp, $_, "sqlf:", |
196 | qw/name sql fields order/ |
197 | ); |
198 | $schema->add_view( %data ) or die $schema->error; |
199 | } |
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200 | |
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201 | # |
202 | # Triggers |
203 | # |
204 | @nodes = $xp->findnodes('/sqlf:schema/sqlf:trigger'); |
205 | foreach (@nodes) { |
206 | my %data = get_tagfields($xp, $_, "sqlf:", |
207 | qw/name perform_action_when database_event fields on_table action order/ |
208 | ); |
209 | $schema->add_trigger( %data ) or die $schema->error; |
210 | } |
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211 | |
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212 | # |
213 | # Procedures |
214 | # |
215 | @nodes = $xp->findnodes('/sqlf:schema/sqlf:procedure'); |
216 | foreach (@nodes) { |
217 | my %data = get_tagfields($xp, $_, "sqlf:", |
218 | qw/name sql parameters owner comments order/ |
219 | ); |
220 | $schema->add_procedure( %data ) or die $schema->error; |
221 | } |
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222 | |
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223 | return 1; |
224 | } |
225 | |
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226 | # ------------------------------------------------------------------- |
227 | sub get_tagfields { |
228 | # |
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229 | # get_tagfields XP, NODE, NAMESPACE => qw/TAGNAMES/; |
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230 | # get_tagfields $node, "sqlf:" => qw/name type fields reference/; |
231 | # |
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232 | # Returns hash of data. |
233 | # TODO - Add handling of an explicit NULL value. |
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234 | # |
235 | |
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236 | my ($xp, $node, @names) = @_; |
237 | my (%data, $ns); |
238 | foreach (@names) { |
239 | if ( m/:$/ ) { $ns = $_; next; } # Set def namespace |
240 | my $thisns = (s/(^.*?:)// ? $1 : $ns); |
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241 | |
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242 | my $is_attrib = m/^sql|comments|action$/ ? 0 : 1; |
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243 | |
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244 | my $attrib_path = "\@$thisns$_"; |
245 | my $tag_path = "$thisns$_"; |
246 | if ( $xp->exists($attrib_path,$node) ) { |
247 | $data{$_} = "".$xp->findvalue($attrib_path,$node); |
248 | warn "Use of '$_' as an attribute is depricated." |
249 | ." Use a child tag instead." |
250 | ." To convert your file to the new version see the Docs.\n" |
251 | unless $is_attrib; |
252 | debug "Got $_=".( defined $data{ $_ } ? $data{ $_ } : 'UNDEF' ); |
253 | } |
254 | elsif ( $xp->exists($tag_path,$node) ) { |
255 | $data{$_} = "".$xp->findvalue($tag_path,$node); |
256 | warn "Use of '$_' as a child tag is depricated." |
257 | ." Use an attribute instead." |
258 | ." To convert your file to the new version see the Docs.\n" |
259 | if $is_attrib; |
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260 | debug "Got $_=".( defined $data{ $_ } ? $data{ $_ } : 'UNDEF' ); |
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261 | } |
262 | } |
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263 | |
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264 | return wantarray ? %data : \%data; |
265 | } |
266 | |
267 | 1; |
268 | |
269 | # ------------------------------------------------------------------- |
270 | |
271 | =pod |
272 | |
273 | =head1 BUGS |
274 | |
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275 | Ignores the order attribute for Constraints, Views, Indices, |
276 | Views, Triggers and Procedures, using the tag order instead. (This is the order |
277 | output by the SQLFairy XML producer). |
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278 | |
279 | =head1 TODO |
280 | |
281 | =over 4 |
282 | |
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283 | =item * |
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284 | |
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285 | Support options and extra attributes. |
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286 | |
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287 | =item * |
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288 | |
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289 | Test foreign keys are parsed ok. |
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290 | |
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291 | =item * |
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292 | |
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293 | Control over defaulting of non-existant tags. |
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294 | |
295 | =back |
296 | |
297 | =head1 AUTHOR |
298 | |
299 | Mark D. Addison E<lt>mark.addison@itn.co.ukE<gt>. |
300 | |
301 | =head1 SEE ALSO |
302 | |
303 | perl(1), SQL::Translator, SQL::Translator::Producer::XML::SQLFairy, |
304 | SQL::Translator::Schema. |
305 | |
306 | =cut |