1 package SQL::Translator::Producer::ClassDBI;
4 use vars qw[ $VERSION $DEBUG ];
6 $DEBUG = 1 unless defined $DEBUG;
8 use SQL::Translator::Schema::Constants;
9 use SQL::Translator::Utils qw(debug header_comment);
12 my %CDBI_auto_pkgs = (
20 local $DEBUG = $t->debug;
21 my $no_comments = $t->no_comments;
22 my $schema = $t->schema;
23 my $args = $t->producer_args;
26 if ( my $fmt = $args->{'format_pkg_name'} ) {
27 $t->format_package_name( $fmt );
30 if ( my $fmt = $args->{'format_fk_name'} ) {
31 $t->format_fk_name( $fmt );
34 my $db_user = $args->{'db_user'} || '';
35 my $db_pass = $args->{'db_password'} || '';
36 my $main_pkg_name = $args->{'package_name'} ||
37 # $args->{'main_pkg_name'} || # keep this? undocumented
38 $t->format_package_name('DBI');
39 my $header = header_comment( __PACKAGE__, "# " );
40 my $parser_type = ( split /::/, $t->parser_type )[-1];
41 my $from = $CDBI_auto_pkgs{$parser_type} || '';
42 my $dsn = $args->{'dsn'} || sprintf( 'dbi:%s:_',
43 $CDBI_auto_pkgs{ $parser_type }
44 ? $CDBI_auto_pkgs{ $parser_type } : $parser_type
46 my $sep = '# ' . '-' x 67;
50 # Identify "link tables" (have only PK and FK fields).
54 for my $table ( $schema->get_tables ) {
55 debug("PKG: Table = ", $table->name, "\n");
57 for my $field ( $table->get_fields ) {
58 unless ( $field->is_primary_key or $field->is_foreign_key ) {
66 foreach my $left ( $table->get_fields ) {
67 next unless $left->is_foreign_key;
68 my $lfk = $left->foreign_key_reference or next;
69 my $lr_table = $schema->get_table( $lfk->reference_table )
71 my $lr_field_name = ( $lfk->reference_fields )[0];
72 my $lr_field = $lr_table->get_field($lr_field_name);
73 next unless $lr_field->is_primary_key;
75 foreach my $right ( $table->get_fields ) {
76 next if $left->name eq $right->name;
78 my $rfk = $right->foreign_key_reference or next;
79 my $rr_table = $schema->get_table( $rfk->reference_table )
81 my $rr_field_name = ( $rfk->reference_fields )[0];
82 my $rr_field = $rr_table->get_field($rr_field_name);
83 next unless $rr_field->is_primary_key;
85 $linkable{ $lr_table->name }{ $rr_table->name } = $table;
86 $linkable{ $rr_table->name }{ $lr_table->name } = $table;
87 $linktable{ $table->name } = $table;
93 # Iterate over all tables
95 my ( %packages, $order );
96 for my $table ( $schema->get_tables ) {
97 my $table_name = $table->name or next;
99 my $table_pkg_name = join '::', $main_pkg_name, $t->format_package_name($table_name);
100 $packages{ $table_pkg_name } = {
102 pkg_name => $table_pkg_name,
103 base => $main_pkg_name,
104 table => $table_name,
108 # Primary key may have a differenct accessor method name
110 # if ( my $constraint = $table->primary_key ) {
111 # my $field = ( $constraint->fields )[0];
112 # $packages{ $table_pkg_name }{'_columns_primary'} = $field;
114 # if ( my $pk_xform = $t->format_pk_name ) {
115 # my $pk_name = $pk_xform->( $table_pkg_name, $field );
117 # $packages{$table_pkg_name}{'pk_accessor'} =
118 # "#\n# Primary key accessor\n#\n"
119 # . "sub $pk_name {\n shift->$field\n}\n\n";
124 foreach my $field ( $table->get_fields ) {
125 if ( !$field->is_foreign_key and !$field->is_primary_key ) {
126 push @{ $packages{$table_pkg_name}{'_columns_essential'} },
130 elsif ( !$field->is_primary_key ) {
131 push @{ $packages{$table_pkg_name}{'_columns_others'} },
138 foreach my $link ( keys %{ $linkable{$table_name} } ) {
141 if ( my $fk_xform = $t->format_fk_name ) {
143 # ADD CALLBACK FOR PLURALIZATION MANGLING HERE
144 $linkmethodname = $fk_xform->(
145 $linkable{ $table_name }{ $link }->name,
146 ( $schema->get_table( $link )->primary_key->fields )[0]
151 # ADD CALLBACK FOR PLURALIZATION MANGLING HERE
153 $linkable{ $table_name }{ $link }->name . '_'
154 . ( $schema->get_table( $link )->primary_key->fields )[0]
160 foreach my $field ( $linkable{$table_name}{$link}->get_fields )
162 next unless $field->is_foreign_key;
165 $field->foreign_key_reference->reference_table eq
168 $field->foreign_key_reference->reference_table eq $link
172 ( $field->foreign_key_reference->reference_fields )[0]
173 if $field->foreign_key_reference->reference_table eq
176 push @rk_fields, $field->name
177 if $field->foreign_key_reference->reference_table eq
182 # If one possible traversal via link table.
184 if ( scalar(@rk_fields) == 1 and scalar(@lk_fields) == 1 ) {
185 foreach my $rk_field (@rk_fields) {
186 push @{ $packages{$table_pkg_name}{'has_many'}{$link} },
189 . " { my \$self = shift; "
191 . ( $schema->get_table($link)->primary_key->fields )
194 . $linkable{$table_name}{$link}->name . "_"
200 # Else there is more than one way to traverse it.
201 # ack! Let's treat these types of link tables as
202 # a many-to-one (easier)
204 # NOTE: we need to rethink the link method name,
205 # as the cardinality has shifted on us.
208 elsif ( scalar(@rk_fields) == 1 ) {
209 foreach my $rk_field (@rk_fields) {
211 # ADD CALLBACK FOR PLURALIZATION MANGLING HERE
213 push @{ $packages{$table_pkg_name}{'has_many'}{$link} },
215 . $linkable{$table_name}{$link}->name
216 . "s { my \$self = shift; return \$self->"
217 . $linkable{$table_name}{$link}->name . "_"
222 elsif ( scalar(@lk_fields) == 1 ) {
224 # These will be taken care of on the other end...
229 # Many many many. Need multiple iterations here,
230 # data structure revision to handle N FK sources.
231 # This code has not been tested and likely doesn't
234 foreach my $rk_field (@rk_fields) {
235 # ADD CALLBACK FOR PLURALIZATION MANGLING HERE
236 push @{ $packages{$table_pkg_name}{'has_many'}{$link} },
238 . $linkable{$table_name}{$link}->name . "_"
240 . "s { my \$self = shift; return \$self->"
241 . $linkable{$table_name}{$link}->name . "_"
250 # Use foreign keys to set up "has_a/has_many" relationships.
252 foreach my $field ( $table->get_fields ) {
253 if ( $field->is_foreign_key ) {
254 my $table_name = $table->name;
255 my $field_name = $field->name;
256 # my $fk_method = $t->format_fk_name( $table_name, $field_name );
257 my $fk_method = join('::', $table_pkg_name,
258 $t->format_fk_name( $table_name, $field_name )
260 my $fk = $field->foreign_key_reference;
261 my $ref_table = $fk->reference_table;
262 my $ref_pkg = $t->format_package_name($ref_table);
263 my $ref_field = ( $fk->reference_fields )[0];
264 # my $fk_method = join('::',
265 # $table_pkg_name, $t->format_fk_name( $ref_table )
268 push @{ $packages{$table_pkg_name}{'has_a'} },
269 "$table_pkg_name->has_a(\n"
270 . " $field_name => '$ref_pkg'\n);\n\n"
271 . "sub $fk_method {\n"
272 . " return shift->$field_name\n}\n\n"
275 # if there weren't M-M relationships via the has_many
276 # being set up here, create nice pluralized method alias
277 # rather for user as alt. to ugly tablename_fieldname name
279 # if ( !$packages{$ref_pkg}{'has_many'}{$table_name} ) {
281 # # ADD CALLBACK FOR PLURALIZATION MANGLING HERE
283 # push @{ $packages{$ref_pkg}{'has_many'}{$table_name} },
284 # "sub ${table_name}s {\n " .
285 # "return shift->$table_name\_$field_name\n}\n\n";
291 push @{ $packages{$ref_pkg}{'has_many'}{$table_name} },
292 "$ref_pkg->has_many(\n '${table_name}_${field_name}', "
293 . "'$table_pkg_name' => '$field_name'\n);\n\n";
300 # Now build up text of package.
302 my $base_pkg = sprintf( 'Class::DBI%s', $from ? "::$from" : '' );
303 push @create, join ( "\n",
304 "package $main_pkg_name;\n",
307 "use base '$base_pkg';\n",
308 "$main_pkg_name->set_db('Main', '$dsn', '$db_user', '$db_pass');\n\n",
312 sort { $packages{ $a }{'order'} <=> $packages{ $b }{'order'} }
315 my $pkg = $packages{$pkg_name} or next;
316 next unless $pkg->{'pkg_name'};
318 push @create, join ( "\n",
320 "package " . $pkg->{'pkg_name'} . ";",
321 "use base '" . $pkg->{'base'} . "';",
322 "use Class::DBI::Pager;\n\n",
326 push @create, join('',
334 my $table = $schema->get_table( $pkg->{'table'} );
335 my @field_names = map { $_->name } $table->get_fields;
337 push @create, join("\n",
338 $pkg_name."->table('".$pkg->{'table'}."');\n",
339 $pkg_name."->columns(All => qw/".
340 join(' ', @field_names)."/);\n\n",
346 if ( my $pk = $pkg->{'pk_accessor'} ) {
350 if ( my @has_a = @{ $pkg->{'has_a'} || [] } ) {
351 push @create, $_ for @has_a;
354 foreach my $has_many_key ( keys %{ $pkg->{'has_many'} } ) {
355 if ( my @has_many = @{ $pkg->{'has_many'}{$has_many_key} || [] } ) {
356 push @create, $_ for @has_many;
361 push @create, "1;\n";
374 SQL::Translator::Producer::ClassDBI - create Class::DBI classes from schema
378 Use this producer as you would any other from SQL::Translator. See
379 L<SQL::Translator> for details.
381 This package uses SQL::Translator's formatting methods
382 format_package_name(), format_pk_name(), format_fk_name(), and
383 format_table_name() as it creates classes, one per table in the schema
384 provided. An additional base class is also created for database connectivity
385 configuration. See L<Class::DBI> for details on how this works.
389 Allen Day E<lt>allenday@ucla.eduE<gt>,
390 Ying Zhang E<lt>zyolive@yahoo.comE<gt>,
391 Ken Youens-Clark E<lt>kclark@cpan.orgE<gt>.