1 package SQL::Translator::Producer::ClassDBI;
3 # -------------------------------------------------------------------
4 # $Id: ClassDBI.pm,v 1.21 2003-06-25 19:10:17 allenday Exp $
5 # -------------------------------------------------------------------
6 # Copyright (C) 2003 Allen Day <allenday@ucla.edu>,
7 # Ying Zhang <zyolive@yahoo.com>
9 # This program is free software; you can redistribute it and/or
10 # modify it under the terms of the GNU General Public License as
11 # published by the Free Software Foundation; version 2.
13 # This program is distributed in the hope that it will be useful, but
14 # WITHOUT ANY WARRANTY; without even the implied warranty of
15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 # General Public License for more details.
18 # You should have received a copy of the GNU General Public License
19 # along with this program; if not, write to the Free Software
20 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
22 # -------------------------------------------------------------------
25 use vars qw[ $VERSION $DEBUG ];
26 $VERSION = sprintf "%d.%02d", q$Revision: 1.21 $ =~ /(\d+)\.(\d+)/;
27 $DEBUG = 1 unless defined $DEBUG;
29 use SQL::Translator::Schema::Constants;
30 use SQL::Translator::Utils qw(header_comment);
33 my %CDBI_auto_pkgs = (
39 # -------------------------------------------------------------------
41 my $translator = shift;
42 local $DEBUG = $translator->debug;
43 my $no_comments = $translator->no_comments;
44 my $schema = $translator->schema;
45 my $args = $translator->producer_args;
46 my $db_user = $args->{'db_user'} || '';
47 my $db_pass = $args->{'db_pass'} || '';
48 my $parser_type = $translator->parser_type;
49 my $dsn = $args->{'dsn'} || "dbi:$CDBI_auto_pkgs{$parser_type}:_";
50 my $main_pkg_name = $translator->format_package_name('DBI');
51 my $header = header_comment(__PACKAGE__, "# ");
52 my $sep = '# ' . '-' x 67;
54 my $parser_type = ( split /::/, $translator->parser_type )[-1];
55 my $from = $CDBI_auto_pkgs{ $parser_type } || '';
58 # Iterate over all tables
60 my ( %packages, $order );
61 for my $table ( $schema->get_tables ) {
62 my $table_name = $table->name or next;
64 my $table_pkg_name = $translator->format_package_name($table_name);
65 $packages{ $table_pkg_name } = {
67 pkg_name => $table_pkg_name,
68 base => $main_pkg_name,
73 # Primary key may have a differenct accessor method name
75 if(defined($translator->format_pk_name)) {
76 # if ( my $pk_xform = $translator->format_pk_name ) {
77 if ( my $constraint = $table->primary_key ) {
78 my $field = ($constraint->fields)[0];
79 # my $pk_name = $pk_xform->($table_pkg_name, $field);
80 my $pk_name = $translator->format_pk_name($table_pkg_name, $field);
82 $packages{ $table_pkg_name }{'pk_accessor'} =
83 "#\n# Primary key accessor\n#\n".
84 "sub $pk_name {\n shift->$field\n}\n"
90 # Use foreign keys to set up "has_a/has_many" relationships.
92 foreach my $field ( $table->get_fields ) {
93 if ( $field->is_foreign_key ) {
94 my $table_name = $table->name;
95 my $field_name = $field->name;
96 my $fk = $field->foreign_key_reference;
97 my $ref_table = $fk->reference_table;
98 my $ref_pkg = $translator->format_package_name($ref_table);
100 $translator->format_fk_name($ref_table, $field_name);
102 push @{ $packages{ $table_pkg_name }{'has_a'} },
103 "$table_pkg_name->has_a(\n".
104 " $field_name => '$ref_pkg'\n);\n\n".
106 " return shift->$field_name\n}\n\n"
110 # If this table "has a" to the other, then it follows
111 # that the other table "has many" of this one, right?
113 push @{ $packages{ $ref_pkg }{'has_many'} },
114 "$ref_pkg->has_many(\n '$table_name\s', ".
115 "'$table_pkg_name' => '$field_name'\n);\n\n"
121 # Identify link tables, defined as tables that have
122 # only PK and FK fields.
126 # foreach my $table ( $schema->get_tables ) {
128 # foreach my $field ( $table->get_fields ) {
129 # unless ( $field->is_primary_key or $field->is_foreign_key ) {
136 # foreach my $left ( $table->get_fields ) {
137 # next unless $left->is_foreign_key and $schema->get_table(
138 # $left->foreign_key_reference->reference_table
141 # next unless $left->is_foreign_key and $schema->get_table(
142 # $left->foreign_key_reference->reference_table
144 # ($left->foreign_key_reference->reference_fields)[0]
147 # foreach my $right ( $table->get_fields ) {
149 # next if $left->name eq $right->name;
151 # next unless $right->is_foreign_key and
152 # $schema->get_table(
153 # $right->foreign_key_reference->reference_table
157 # next unless $right->is_foreign_key and
158 # $schema->get_table(
159 # $right->foreign_key_reference->reference_table
161 # ($right->foreign_key_reference->reference_fields)[0]
167 # $left->foreign_key_reference->reference_table
169 # $right->foreign_key_reference->reference_table
173 # $right->foreign_key_reference->reference_table
175 # $left->foreign_key_reference->reference_table
178 # $linktable{ $table->name } = $table;
185 # # Generate many-to-many linking methods for data tables
188 # for ( $table->get_fields ) {
189 # $is_data++ if !$_->is_foreign_key and !$_->is_primary_key;
194 # foreach my $link ( keys %{ $linkable{ $table->name } } ) {
195 # my $linkmethodname =
196 # "_".$translator->format_fk_name($table->name,$link)."_refs"
199 # $create .= $translator->format_package_name($table->name).
200 # "->has_many('$linkmethodname','".
201 # $translator->format_package_name(
202 # $linkable{$table->name}{$link}->name
204 # ($schema->get_table($link)->primary_key->fields)[0]."');\n"
207 # $create .= "sub ". $translator->format_fk_name($table,$link).
208 # # HARDCODED 's' HERE.
209 # # ADD CALLBACK FOR PLURALIZATION MANGLING
210 # "s {\n my \$self = shift; return map \$_->".$link.
211 # ", \$self->".$linkmethodname.";\n}\n\n"
217 my $base_pkg = sprintf( 'Class::DBI%s', $from ? "::$from" : '' );
218 my $create = join("\n",
219 "package $main_pkg_name;\n",
222 "use base '$base_pkg';\n",
223 "$main_pkg_name->set_db('Main', '$dsn', '$db_user', '$db_pass');\n\n",
227 sort { $packages{ $a }{'order'} <=> $packages{ $b }{'order'} }
230 my $pkg = $packages{ $pkg_name };
232 $create .= join("\n",
234 "package ".$pkg->{'pkg_name'}.";",
235 "use base '".$pkg->{'base'}."';",
236 "use Class::DBI::Pager;\n\n",
241 $pkg->{'pkg_name'}."->set_up_table('".$pkg->{'table'}."');\n\n";
244 my $table = $schema->get_table( $pkg->{'table'} );
245 my @field_names = map { $_->name } $table->get_fields;
247 $create .= join("\n",
248 $pkg_name."->table('".$pkg->{'table'}."');\n",
249 $pkg_name."->columns(All => qw/".
250 join(' ', @field_names)."/);\n\n",
254 if ( my $pk = $pkg->{'pk_accessor'} ) {
258 if ( my @has_a = @{ $pkg->{'has_a'} || [] } ) {
259 $create .= $_ for @has_a;
262 if ( my @has_many = @{ $pkg->{'has_many'} || [] } ) {
263 $create .= $_ for @has_many;
274 # -------------------------------------------------------------------
280 SQL::Translator::Producer::ClassDBI - create Class::DBI classes from schema
284 Use this producer as you would any other from SQL::Translator. See
285 L<SQL::Translator> for details.
287 This package utilizes SQL::Translator's formatting methods
288 format_package_name(), format_pk_name(), format_fk_name(), and
289 format_table_name() as it creates classes, one per table in the schema
290 provided. An additional base class is also created for database connectivity
291 configuration. See L<Class::DBI> for details on how this works.
295 Allen Day E<lt>allenday@ucla.eduE<gt>
296 Ying Zhang E<lt>zyolive@yahoo.comE<gt>,
297 Ken Y. Clark E<lt>kclark@cpan.org<gt>.