package SQL::Translator::Producer::ClassDBI;
# -------------------------------------------------------------------
-# $Id: ClassDBI.pm,v 1.22 2003-06-25 19:17:06 kycl4rk Exp $
+# $Id: ClassDBI.pm,v 1.26 2003-07-09 05:59:24 allenday Exp $
# -------------------------------------------------------------------
# Copyright (C) 2003 Allen Day <allenday@ucla.edu>,
# Ying Zhang <zyolive@yahoo.com>
use strict;
use vars qw[ $VERSION $DEBUG ];
-$VERSION = sprintf "%d.%02d", q$Revision: 1.22 $ =~ /(\d+)\.(\d+)/;
+$VERSION = sprintf "%d.%02d", q$Revision: 1.26 $ =~ /(\d+)\.(\d+)/;
$DEBUG = 1 unless defined $DEBUG;
use SQL::Translator::Schema::Constants;
# -------------------------------------------------------------------
sub produce {
- my $translator = shift;
- local $DEBUG = $translator->debug;
- my $no_comments = $translator->no_comments;
- my $schema = $translator->schema;
- my $args = $translator->producer_args;
+ my $t = shift;
+ my $create = undef;
+ local $DEBUG = $t->debug;
+ my $no_comments = $t->no_comments;
+ my $schema = $t->schema;
+ my $args = $t->producer_args;
my $db_user = $args->{'db_user'} || '';
my $db_pass = $args->{'db_pass'} || '';
- my $parser_type = $translator->parser_type;
- my $dsn = $args->{'dsn'} || "dbi:$CDBI_auto_pkgs{$parser_type}:_";
- my $main_pkg_name = $translator->format_package_name('DBI');
+ my $main_pkg_name = $t->format_package_name('DBI');
my $header = header_comment(__PACKAGE__, "# ");
+ my $parser_type = ( split /::/, $t->parser_type )[-1];
+ my $from = $CDBI_auto_pkgs{ $parser_type } || '';
+ my $dsn = $args->{'dsn'} || sprintf( 'dbi:%s:_',
+ $CDBI_auto_pkgs{ $parser_type }
+ ? $CDBI_auto_pkgs{ $parser_type } : $parser_type
+ );
my $sep = '# ' . '-' x 67;
- my $parser_type = ( split /::/, $translator->parser_type )[-1];
- my $from = $CDBI_auto_pkgs{ $parser_type } || '';
-
+ #
+ # Identify "link tables" (have only PK and FK fields).
+ #
+ my %linkable;
+ my %linktable;
+ foreach my $table ( $schema->get_tables ) {
+ my $is_link = 1;
+ foreach my $field ( $table->get_fields ) {
+ unless ( $field->is_primary_key or $field->is_foreign_key ) {
+ $is_link = 0;
+ last;
+ }
+ }
+
+ next unless $is_link;
+
+ foreach my $left ( $table->get_fields ) {
+ next unless $left->is_foreign_key;
+ my $lfk = $left->foreign_key_reference or next;
+ my $lr_table = $schema->get_table( $lfk->reference_table )
+ or next;
+ my $lr_field_name = ($lfk->reference_fields)[0];
+ my $lr_field = $lr_table->get_field($lr_field_name);
+ next unless $lr_field->is_primary_key;
+
+ foreach my $right ( $table->get_fields ) {
+ next if $left->name eq $right->name;
+
+ my $rfk = $right->foreign_key_reference or next;
+ my $rr_table = $schema->get_table( $rfk->reference_table )
+ or next;
+ my $rr_field_name = ($rfk->reference_fields)[0];
+ my $rr_field = $rr_table->get_field($rr_field_name);
+ next unless $rr_field->is_primary_key;
+
+ $linkable{ $lr_table->name }{ $rr_table->name } = $table;
+ $linkable{ $rr_table->name }{ $lr_table->name } = $table;
+ $linktable{ $table->name } = $table;
+ }
+ }
+ }
+
#
# Iterate over all tables
#
for my $table ( $schema->get_tables ) {
my $table_name = $table->name or next;
- my $table_pkg_name = $translator->format_package_name($table_name);
+ my $table_pkg_name = $t->format_package_name($table_name);
$packages{ $table_pkg_name } = {
order => ++$order,
pkg_name => $table_pkg_name,
#
# Primary key may have a differenct accessor method name
#
- if ( my $pk_xform = $translator->format_pk_name ) {
+ if ( my $pk_xform = $t->format_pk_name ) {
if ( my $constraint = $table->primary_key ) {
my $field = ($constraint->fields)[0];
my $pk_name = $pk_xform->($table_pkg_name, $field);
$packages{ $table_pkg_name }{'pk_accessor'} =
"#\n# Primary key accessor\n#\n".
- "sub $pk_name {\n shift->$field\n}\n"
+ "sub $pk_name {\n shift->$field\n}\n\n"
;
}
}
#
# Use foreign keys to set up "has_a/has_many" relationships.
#
+ my $is_data = 0;
foreach my $field ( $table->get_fields ) {
+ $is_data++ if !$field->is_foreign_key and !$field->is_primary_key;
if ( $field->is_foreign_key ) {
my $table_name = $table->name;
my $field_name = $field->name;
+ my $fk_method = $t->format_fk_name($table_name, $field_name);
my $fk = $field->foreign_key_reference;
my $ref_table = $fk->reference_table;
- my $ref_pkg = $translator->format_package_name($ref_table);
- my $ref_fld =
- $translator->format_fk_name($ref_table, $field_name);
+ my $ref_pkg = $t->format_package_name($ref_table);
+ my $ref_field = ($fk->reference_fields)[0];
push @{ $packages{ $table_pkg_name }{'has_a'} },
"$table_pkg_name->has_a(\n".
" $field_name => '$ref_pkg'\n);\n\n".
- "sub $ref_fld {\n".
+ "sub $fk_method {\n".
" return shift->$field_name\n}\n\n"
;
# If this table "has a" to the other, then it follows
# that the other table "has many" of this one, right?
#
+ # No... there is the possibility of 1-1 cardinality
push @{ $packages{ $ref_pkg }{'has_many'} },
- "$ref_pkg->has_many(\n '$table_name\s', ".
+ "$ref_pkg->has_many(\n '${table_name}_${field_name}', ".
"'$table_pkg_name' => '$field_name'\n);\n\n"
;
}
- }
+ }
- #
- # Identify link tables, defined as tables that have
- # only PK and FK fields.
- #
-# my %linkable;
-# my %linktable;
-# foreach my $table ( $schema->get_tables ) {
-# my $is_link = 1;
-# foreach my $field ( $table->get_fields ) {
-# unless ( $field->is_primary_key or $field->is_foreign_key ) {
-# $is_link = 0;
-# last;
-# }
-# }
-#
-# if ( $is_link ) {
-# foreach my $left ( $table->get_fields ) {
-# next unless $left->is_foreign_key and $schema->get_table(
-# $left->foreign_key_reference->reference_table
-# );
-#
-# next unless $left->is_foreign_key and $schema->get_table(
-# $left->foreign_key_reference->reference_table
-# )->get_field(
-# ($left->foreign_key_reference->reference_fields)[0]
-# )->is_primary_key;
-#
-# foreach my $right ( $table->get_fields ) {
-# #skip the diagonal
-# next if $left->name eq $right->name;
-#
-# next unless $right->is_foreign_key and
-# $schema->get_table(
-# $right->foreign_key_reference->reference_table
-# )
-# ;
-#
-# next unless $right->is_foreign_key and
-# $schema->get_table(
-# $right->foreign_key_reference->reference_table
-# )->get_field(
-# ($right->foreign_key_reference->reference_fields)[0]
-# )->is_primary_key
-# ;
-#
-#
-# $linkable{
-# $left->foreign_key_reference->reference_table
-# }{
-# $right->foreign_key_reference->reference_table
-# } = $table;
-#
-# $linkable{
-# $right->foreign_key_reference->reference_table
-# }{
-# $left->foreign_key_reference->reference_table
-# } = $table;
-#
-# $linktable{ $table->name } = $table;
-# }
-# }
-# }
-# }
-#
-# #
-# # Generate many-to-many linking methods for data tables
-# #
-# my $is_data = 0;
-# for ( $table->get_fields ) {
-# $is_data++ if !$_->is_foreign_key and !$_->is_primary_key;
-# }
-#
-# my %linked;
-# if ( $is_data ) {
-# foreach my $link ( keys %{ $linkable{ $table->name } } ) {
-# my $linkmethodname =
-# "_".$translator->format_fk_name($table->name,$link)."_refs"
-# ;
-#
-# $create .= $translator->format_package_name($table->name).
-# "->has_many('$linkmethodname','".
-# $translator->format_package_name(
-# $linkable{$table->name}{$link}->name
-# )."','".
-# ($schema->get_table($link)->primary_key->fields)[0]."');\n"
-# ;
-#
-# $create .= "sub ". $translator->format_fk_name($table,$link).
-# # HARDCODED 's' HERE.
-# # ADD CALLBACK FOR PLURALIZATION MANGLING
-# "s {\n my \$self = shift; return map \$_->".$link.
-# ", \$self->".$linkmethodname.";\n}\n\n"
-# ;
-# }
-# }
+ my %linked;
+ if ( $is_data ) {
+ foreach my $link ( keys %{ $linkable{ $table_name } } ) {
+ my $linkmethodname;
+
+ # ADD CALLBACK FOR PLURALIZATION MANGLING HERE
+ if ( my $fk_xform = $t->format_fk_name ){
+ $linkmethodname = $fk_xform->($linkable{$table_name}{$link}->name,
+ ($schema->get_table($link)->primary_key->fields)[0]).'s';
+ } else {
+ $linkmethodname = $linkable{$table_name}{$link}->name.'_'.
+ ($schema->get_table($link)->primary_key->fields)[0].'s';
+ }
+
+#$create .= $field->name. "\n";
+#$create .= $field->foreign_key_reference->reference_table. "\n";
+#$create .= $linkable{ $table_name }{ $link }->name. "\n";
+#$create .= $table_name. "\n";
+#$create .= $link. "\n";
+#$create .= "***\n\n";
+
+ my @rk_fields = ();
+ my @lk_fields = ();
+ foreach my $field ($linkable{$table_name}{$link}->get_fields){
+ next unless $field->is_foreign_key;
+
+ next unless(
+ $field->foreign_key_reference->reference_table eq $table_name
+ ||
+ $field->foreign_key_reference->reference_table eq $link
+ );
+ push @lk_fields, ($field->foreign_key_reference->reference_fields)[0]
+ if $field->foreign_key_reference->reference_table eq $link;
+ push @rk_fields, $field->name
+ if $field->foreign_key_reference->reference_table eq $table_name;
+ }
+
+ #if one possible traversal via link table
+ if(scalar(@rk_fields) == 1 and scalar(@lk_fields) == 1){
+ foreach my $rk_field (@rk_fields){
+ push @{ $packages{ $table_pkg_name }{'has_many'} },
+ "sub ".$linkmethodname." { my \$self = shift; ".
+ "return map \$_->".
+ ($schema->get_table($link)->primary_key->fields)[0].
+ ", \$self->".$linkable{$table_name}{$link}->name.
+ "_".$rk_field." }\n\n";
+ }
+ #else there is more than one way to traverse it. ack!
+ #let's treat these types of link tables as a many-to-one (easier)
+ #
+ #NOTE: we need to rethink the link method name, as the cardinality
+ #has shifted on us.
+ } elsif(scalar(@rk_fields) == 1){
+ foreach my $rk_field (@rk_fields){
+ push @{ $packages{ $table_pkg_name }{'has_many'} },
+ "sub " . $linkable{$table_name}{$link}->name .
+ "s { my \$self = shift; return \$self->" .
+ $linkable{$table_name}{$link}->name . "_" .
+ $rk_field . "(\@_) }\n\n";
+ }
+ } elsif(scalar(@lk_fields) == 1){
+ #these will be taken care of on the other end...
+ } else {
+ foreach my $rk_field (@rk_fields){
+ push @{ $packages{ $table_pkg_name }{'has_many'} },
+ "sub " . $linkable{$table_name}{$link}->name . "_" . $rk_field .
+ "s { my \$self = shift; return \$self->" .
+ $linkable{$table_name}{$link}->name . "_" .
+ $rk_field . "(\@_) }\n\n";
+ }
+ }
+ }
+ }
}
+ #
+ # Now build up text of package.
+ #
my $base_pkg = sprintf( 'Class::DBI%s', $from ? "::$from" : '' );
- my $create = join("\n",
- "package $main_pkg_name;\n",
- $header,
- "use strict;",
- "use base '$base_pkg';\n",
- "$main_pkg_name->set_db('Main', '$dsn', '$db_user', '$db_pass');\n\n",
+ $create .= join("\n",
+ "package $main_pkg_name;\n",
+ $header,
+ "use strict;",
+ "use base '$base_pkg';\n",
+ "$main_pkg_name->set_db('Main', '$dsn', '$db_user', '$db_pass');\n\n",
);
for my $pkg_name (
projects / dbsrgits/SQL-Translator.git / blobdiff