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1 | package SQL::Translator::Parser::XML::SQLFairy; |
2 | |
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3 | =head1 NAME |
4 | |
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5 | SQL::Translator::Parser::XML::SQLFairy - parser for SQL::Translator's XML. |
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6 | |
7 | =head1 SYNOPSIS |
8 | |
9 | use SQL::Translator; |
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10 | |
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11 | my $translator = SQL::Translator->new( show_warnings => 1 ); |
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12 | |
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13 | my $out = $obj->translate( |
14 | from => 'XML-SQLFairy', |
15 | to => 'MySQL', |
16 | filename => 'schema.xml', |
17 | ) or die $translator->error; |
18 | |
19 | print $out; |
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20 | |
21 | =head1 DESCRIPTION |
22 | |
23 | This parser handles the flavor of XML used natively by the SQLFairy |
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24 | project (L<SQL::Translator>). The XML must be in the namespace |
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25 | "http://sqlfairy.sourceforge.net/sqlfairy.xml." |
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26 | See L<SQL::Translator::Producer::XML::SQLFairy> for details of this format. |
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27 | |
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28 | You do not need to specify every attribute of the Schema objects as any missing |
29 | from the XML will be set to their default values. e.g. A field could be written |
30 | using only; |
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31 | |
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32 | <sqlf:field name="email" data_type="varchar" size="255" /> |
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33 | |
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34 | Instead of the full; |
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35 | |
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36 | <sqlf:field name="email" data_type="varchar" size="255" is_nullable="1" |
37 | is_auto_increment="0" is_primary_key="0" is_foreign_key="0" order="4"> |
38 | <sqlf:comments></sqlf:comments> |
39 | </sqlf:field> |
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40 | |
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41 | If you do not explicitly set the order of items using order attributes on the |
42 | tags then the order the tags appear in the XML will be used. |
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43 | |
44 | =head2 default_value |
45 | |
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46 | Leave the attribute out all together to use the default in L<Schema::Field>. |
47 | Use empty quotes or 'EMPTY_STRING' for a zero lenth string. 'NULL' for an |
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48 | explicit null (currently sets default_value to undef in the |
49 | Schema::Field obj). |
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50 | |
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51 | <sqlf:field default_value="" /> <!-- Empty string --> |
52 | <sqlf:field default_value="EMPTY_STRING" /> <!-- Empty string --> |
53 | <sqlf:field default_value="NULL" /> <!-- NULL --> |
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54 | |
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55 | =head2 ARGS |
56 | |
57 | Doesn't take any extra parser args at the moment. |
58 | |
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59 | =head1 LEGACY FORMAT |
60 | |
61 | The previous version of the SQLFairy XML allowed the attributes of the the |
62 | schema objects to be written as either xml attributes or as data elements, in |
63 | any combination. While this allows for lots of flexibility in writing the XML |
64 | the result is a great many possible XML formats, not so good for DTD writing, |
65 | XPathing etc! So we have moved to a fixed version described in |
66 | L<SQL::Translator::Producer::XML::SQLFairy>. |
67 | |
68 | This version of the parser will still parse the old formats and emmit warnings |
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69 | when it sees them being used but they should be considered B<heavily |
70 | depreciated>. |
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71 | |
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72 | To convert your old format files simply pass them through the translator :) |
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73 | |
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74 | $ sqlt -f XML-SQLFairy -t XML-SQLFairy schema-old.xml > schema-new.xml |
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75 | |
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76 | =cut |
77 | |
78 | # ------------------------------------------------------------------- |
79 | |
80 | use strict; |
81 | |
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82 | use vars qw[ $DEBUG $VERSION @EXPORT_OK ]; |
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83 | $VERSION = '1.59'; |
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84 | $DEBUG = 0 unless defined $DEBUG; |
85 | |
86 | use Data::Dumper; |
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87 | use Carp::Clan qw/^SQL::Translator/; |
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88 | use Exporter; |
89 | use base qw(Exporter); |
90 | @EXPORT_OK = qw(parse); |
91 | |
92 | use base qw/SQL::Translator::Parser/; # Doesnt do anything at the mo! |
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93 | use SQL::Translator::Utils 'debug'; |
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94 | use XML::LibXML 1.69; |
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95 | use XML::LibXML::XPathContext; |
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96 | |
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97 | sub parse { |
98 | my ( $translator, $data ) = @_; |
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99 | my $schema = $translator->schema; |
100 | local $DEBUG = $translator->debug; |
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101 | my $doc = XML::LibXML->new->parse_string($data); |
102 | my $xp = XML::LibXML::XPathContext->new($doc); |
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103 | |
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104 | $xp->registerNs("sqlf", "http://sqlfairy.sourceforge.net/sqlfairy.xml"); |
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105 | |
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106 | # |
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107 | # Work our way through the tables |
108 | # |
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109 | my @nodes = $xp->findnodes( |
110 | '/sqlf:schema/sqlf:table|/sqlf:schema/sqlf:tables/sqlf:table' |
111 | ); |
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112 | for my $tblnode ( |
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113 | sort { |
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114 | ("".$xp->findvalue('sqlf:order|@order',$a) || 0) |
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115 | <=> |
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116 | ("".$xp->findvalue('sqlf:order|@order',$b) || 0) |
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117 | } @nodes |
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118 | ) { |
119 | debug "Adding table:".$xp->findvalue('sqlf:name',$tblnode); |
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120 | |
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121 | my $table = $schema->add_table( |
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122 | get_tagfields($xp, $tblnode, "sqlf:" => qw/name order extra/) |
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123 | ) or die $schema->error; |
124 | |
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125 | # |
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126 | # Fields |
127 | # |
128 | my @nodes = $xp->findnodes('sqlf:fields/sqlf:field',$tblnode); |
129 | foreach ( |
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130 | sort { |
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131 | ("".$xp->findvalue('sqlf:order',$a) || 0) |
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132 | <=> |
133 | ("".$xp->findvalue('sqlf:order',$b) || 0) |
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134 | } @nodes |
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135 | ) { |
136 | my %fdata = get_tagfields($xp, $_, "sqlf:", |
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137 | qw/name data_type size default_value is_nullable extra |
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138 | is_auto_increment is_primary_key is_foreign_key comments/ |
139 | ); |
140 | |
141 | if ( |
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142 | exists $fdata{'default_value'} and |
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143 | defined $fdata{'default_value'} |
144 | ) { |
145 | if ( $fdata{'default_value'} =~ /^\s*NULL\s*$/ ) { |
146 | $fdata{'default_value'}= undef; |
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147 | } |
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148 | elsif ( $fdata{'default_value'} =~ /^\s*EMPTY_STRING\s*$/ ) { |
149 | $fdata{'default_value'} = ""; |
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150 | } |
151 | } |
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152 | |
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153 | my $field = $table->add_field( %fdata ) or die $table->error; |
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154 | |
155 | $table->primary_key( $field->name ) if $fdata{'is_primary_key'}; |
156 | |
157 | # |
158 | # TODO: |
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159 | # - We should be able to make the table obj spot this when |
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160 | # we use add_field. |
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161 | # |
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162 | } |
163 | |
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164 | # |
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165 | # Constraints |
166 | # |
167 | @nodes = $xp->findnodes('sqlf:constraints/sqlf:constraint',$tblnode); |
168 | foreach (@nodes) { |
169 | my %data = get_tagfields($xp, $_, "sqlf:", |
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170 | qw/name type table fields reference_fields reference_table |
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171 | match_type on_delete on_update extra/ |
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172 | ); |
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173 | $table->add_constraint( %data ) or die $table->error; |
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174 | } |
175 | |
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176 | # |
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177 | # Indexes |
178 | # |
179 | @nodes = $xp->findnodes('sqlf:indices/sqlf:index',$tblnode); |
180 | foreach (@nodes) { |
181 | my %data = get_tagfields($xp, $_, "sqlf:", |
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182 | qw/name type fields options extra/); |
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183 | $table->add_index( %data ) or die $table->error; |
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184 | } |
185 | |
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186 | |
187 | # |
188 | # Comments |
189 | # |
190 | @nodes = $xp->findnodes('sqlf:comments/sqlf:comment',$tblnode); |
191 | foreach (@nodes) { |
192 | my $data = $_->string_value; |
193 | $table->comments( $data ); |
194 | } |
195 | |
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196 | } # tables loop |
197 | |
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198 | # |
199 | # Views |
200 | # |
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201 | @nodes = $xp->findnodes( |
202 | '/sqlf:schema/sqlf:view|/sqlf:schema/sqlf:views/sqlf:view' |
203 | ); |
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204 | foreach (@nodes) { |
205 | my %data = get_tagfields($xp, $_, "sqlf:", |
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206 | qw/name sql fields order extra/ |
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207 | ); |
208 | $schema->add_view( %data ) or die $schema->error; |
209 | } |
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210 | |
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211 | # |
212 | # Triggers |
213 | # |
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214 | @nodes = $xp->findnodes( |
215 | '/sqlf:schema/sqlf:trigger|/sqlf:schema/sqlf:triggers/sqlf:trigger' |
216 | ); |
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217 | foreach (@nodes) { |
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218 | my %data = get_tagfields($xp, $_, "sqlf:", qw/ |
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219 | name perform_action_when database_event database_events fields |
220 | on_table action order extra |
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221 | /); |
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222 | |
223 | # back compat |
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224 | if (my $evt = $data{database_event} and $translator->{show_warnings}) { |
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225 | carp 'The database_event tag is deprecated - please use ' . |
226 | 'database_events (which can take one or more comma separated ' . |
227 | 'event names)'; |
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228 | $data{database_events} = join (', ', |
229 | $data{database_events} || (), |
230 | $evt, |
231 | ); |
232 | } |
233 | |
234 | # split into arrayref |
235 | if (my $evts = $data{database_events}) { |
236 | $data{database_events} = [split (/\s*,\s*/, $evts) ]; |
237 | } |
238 | |
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239 | $schema->add_trigger( %data ) or die $schema->error; |
240 | } |
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241 | |
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242 | # |
243 | # Procedures |
244 | # |
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245 | @nodes = $xp->findnodes( |
246 | '/sqlf:schema/sqlf:procedure|/sqlf:schema/sqlf:procedures/sqlf:procedure' |
247 | ); |
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248 | foreach (@nodes) { |
249 | my %data = get_tagfields($xp, $_, "sqlf:", |
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250 | qw/name sql parameters owner comments order extra/ |
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251 | ); |
252 | $schema->add_procedure( %data ) or die $schema->error; |
253 | } |
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254 | |
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255 | return 1; |
256 | } |
257 | |
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258 | # ------------------------------------------------------------------- |
259 | sub get_tagfields { |
260 | # |
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261 | # get_tagfields XP, NODE, NAMESPACE => qw/TAGNAMES/; |
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262 | # get_tagfields $node, "sqlf:" => qw/name type fields reference/; |
263 | # |
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264 | # Returns hash of data. |
265 | # TODO - Add handling of an explicit NULL value. |
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266 | # |
267 | |
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268 | my ($xp, $node, @names) = @_; |
269 | my (%data, $ns); |
270 | foreach (@names) { |
271 | if ( m/:$/ ) { $ns = $_; next; } # Set def namespace |
272 | my $thisns = (s/(^.*?:)// ? $1 : $ns); |
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273 | |
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274 | my $is_attrib = m/^(sql|comments|action|extra)$/ ? 0 : 1; |
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275 | |
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276 | my $attrib_path = "\@$_"; |
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277 | my $tag_path = "$thisns$_"; |
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278 | if ( my $found = $xp->find($attrib_path,$node) ) { |
279 | $data{$_} = "".$found->to_literal; |
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280 | warn "Use of '$_' as an attribute is depricated." |
281 | ." Use a child tag instead." |
282 | ." To convert your file to the new version see the Docs.\n" |
283 | unless $is_attrib; |
284 | debug "Got $_=".( defined $data{ $_ } ? $data{ $_ } : 'UNDEF' ); |
285 | } |
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286 | elsif ( $found = $xp->find($tag_path,$node) ) { |
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287 | if ($_ eq "extra") { |
288 | my %extra; |
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289 | foreach ( $found->pop->getAttributes ) { |
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290 | $extra{$_->getName} = $_->getData; |
291 | } |
292 | $data{$_} = \%extra; |
293 | } |
294 | else { |
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295 | $data{$_} = "".$found->to_literal; |
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296 | } |
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297 | warn "Use of '$_' as a child tag is depricated." |
298 | ." Use an attribute instead." |
299 | ." To convert your file to the new version see the Docs.\n" |
300 | if $is_attrib; |
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301 | debug "Got $_=".( defined $data{ $_ } ? $data{ $_ } : 'UNDEF' ); |
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302 | } |
303 | } |
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304 | |
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305 | return wantarray ? %data : \%data; |
306 | } |
307 | |
308 | 1; |
309 | |
310 | # ------------------------------------------------------------------- |
311 | |
312 | =pod |
313 | |
314 | =head1 BUGS |
315 | |
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316 | Ignores the order attribute for Constraints, Views, Indices, Views, Triggers |
317 | and Procedures, using the tag order instead. (This is the order output by the |
318 | SQLFairy XML producer). |
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319 | |
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320 | =head1 SEE ALSO |
321 | |
322 | L<perl>, L<SQL::Translator>, L<SQL::Translator::Producer::XML::SQLFairy>, |
323 | L<SQL::Translator::Schema>. |
324 | |
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325 | =head1 TODO |
326 | |
327 | =over 4 |
328 | |
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329 | =item * |
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330 | |
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331 | Support options attribute. |
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332 | |
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333 | =item * |
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334 | |
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335 | Test foreign keys are parsed ok. |
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336 | |
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337 | =item * |
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338 | |
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339 | Control over defaulting. |
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340 | |
341 | =back |
342 | |
343 | =head1 AUTHOR |
344 | |
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345 | Mark D. Addison E<lt>mark.addison@itn.co.ukE<gt>, |
346 | Jonathan Yu E<lt>frequency@cpan.orgE<gt> |
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347 | |
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348 | =cut |