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# (c) Sound Object Logic 2000-2001 |
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|
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use strict; |
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|
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package Tangram::Relational::TableSet; |
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|
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use constant TABLES => 0; |
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use constant SORTED_TABLES => 1; |
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use constant KEY => 2; |
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|
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sub new |
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{ |
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my $class = shift; |
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my %seen; |
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my @tables = grep { !$seen{$_}++ } @_; |
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my @sorted_tables = sort @tables; |
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|
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return bless [ \@tables, \@sorted_tables, "@sorted_tables" ], $class; |
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} |
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|
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sub key |
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{ |
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return shift->[KEY]; |
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} |
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|
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sub tables |
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{ |
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@{ shift->[TABLES] } |
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} |
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|
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sub is_improper_superset |
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{ |
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my ($self, $other) = @_; |
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my %other_tables = map { $_ => 1 } $other->tables(); |
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|
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for my $table ($self->tables()) { |
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delete $other_tables{$table}; |
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return 1 if keys(%other_tables) == 0; |
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} |
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|
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return 0; |
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} |
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|
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package Tangram::Relational::Engine; |
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|
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sub new |
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{ |
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my ($class, $schema, %opts) = @_; |
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|
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my $heterogeneity = { }; |
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my $engine = bless { SCHEMA => $schema, HETEROGENEITY => $heterogeneity }, $class; |
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|
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if ($opts{layout1}) { |
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$engine->{layout1} = 1; |
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$engine->{TYPE_COL} = $schema->{sql}{class_col} || 'classId'; |
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} else { |
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$engine->{TYPE_COL} = $schema->{sql}{class_col} || 'type'; |
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} |
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|
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for my $class ($schema->all_classes) { |
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$engine->{ROOT_TABLES}{$class->{table}} = 1 |
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if $class->is_root(); |
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} |
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|
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for my $class ($schema->all_classes) { |
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|
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$engine->{ROOT_TABLES}{$class->{table}} = 1 |
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if $class->is_root(); |
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|
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next if $class->{abstract}; |
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|
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my $table_set = $engine->get_table_set($class); |
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my $key = $table_set->key(); |
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|
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for my $other ($schema->all_classes) { |
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++$heterogeneity->{$key} if my $ss = $engine->get_table_set($other)->is_improper_superset($table_set); |
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my $other_key = $engine->get_table_set($other)->key; |
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} |
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} |
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|
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# use Data::Dumper; print Dumper $heterogeneity; |
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|
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return $engine; |
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} |
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|
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sub get_table_set |
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{ |
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my ($self, $class) = @_; |
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|
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return $self->{CLASSES}{$class->{name}}{table_set} ||= do { |
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|
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my @table; |
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|
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if ($self->{ROOT_TABLES}{$class->{table}}) { |
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push @table, $class->{table}; |
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} else { |
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my $context = { layout1 => $self->{layout1} }; |
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|
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for my $field ($class->direct_fields()) { |
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if ($field->get_export_cols($context)) { |
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push @table, $class->{table}; |
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last; |
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} |
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} |
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} |
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|
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Tangram::Relational::TableSet |
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->new((map { $self->get_table_set($_)->tables } $class->direct_bases()), @table ); |
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}; |
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} |
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|
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sub get_parts |
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{ |
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my ($self, $class) = @_; |
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|
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@{ $self->{CLASSES}{$class->{name}}{PARTS} ||= do { |
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my %seen; |
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[ grep { !$seen{ $_->{name} }++ } |
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(map { $self->get_parts($_) } $class->direct_bases()), |
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$class |
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] |
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} } |
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} |
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|
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sub get_save_cache |
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{ |
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my ($self, $class) = @_; |
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|
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return $self->{CLASSES}{$class}{SAVE} ||= do { |
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|
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my $schema = $self->{SCHEMA}; |
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my $id_col = $schema->{sql}{id_col}; |
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my $type_col = $self->{TYPE_COL}; |
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|
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my (%tables, @tables); |
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my (@export_sources, @export_closures); |
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|
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my $context = { layout1 => $self->{layout1} }; |
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|
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my $field_index = 2; |
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|
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for my $part ($self->get_parts($class)) { |
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my $table_name = $part->{table}; |
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|
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$context->{class} = $part; |
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|
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my $table = $tables{$table_name} ||= do { push @tables, my $table = [ $table_name, [], [] ]; $table }; |
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|
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for my $field ($part->direct_fields()) { |
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|
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my $exporter = $field->get_exporter($context) |
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or next; |
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|
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if (ref $exporter) { |
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push @export_closures, $exporter; |
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push @export_sources, 'shift(@closures)->($obj, $context)'; |
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} else { |
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push @export_sources, $exporter; |
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} |
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|
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my @export_cols = $field->get_export_cols($context); |
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push @{ $table->[1] }, @export_cols; |
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push @{ $table->[2] }, $field_index..($field_index + $#export_cols); |
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$field_index += @export_cols; |
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} |
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} |
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|
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my $export_source = join ",\n", @export_sources; |
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my $copy_closures = @export_closures ? ' my @closures = @export_closures;' : ''; |
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|
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# $Tangram::TRACE = \*STDOUT; |
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|
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$export_source = "sub { my (\$obj, \$context) = \@_;$copy_closures\n$export_source }"; |
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|
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print $Tangram::TRACE "Compiling exporter for $class->{name}...\n$export_source\n" |
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if $Tangram::TRACE; |
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|
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# use Data::Dumper; print Dumper \@cols; |
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my $exporter = eval $export_source or die; |
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|
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my (@inserts, @updates, @insert_fields, @update_fields); |
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|
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for my $table (@tables) { |
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my ($table_name, $cols, $fields) = @$table; |
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my @meta = ( $id_col ); |
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my @meta_fields = ( 0 ); |
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|
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if ($self->{ROOT_TABLES}{$table_name}) { |
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push @meta, $type_col; |
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push @meta_fields, 1; |
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} |
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|
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next unless @meta > 1 || @$cols; |
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|
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push @inserts, sprintf('INSERT INTO %s (%s) VALUES (%s)', |
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$table_name, |
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join(', ', @meta, @$cols), |
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join(', ', ('?') x (@meta + @$cols))); |
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push @insert_fields, [ @meta_fields, @$fields ]; |
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|
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if (@$cols) { |
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push @updates, sprintf('UPDATE %s SET %s WHERE %s = ?', |
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$table_name, |
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join(', ', map { "$_ = ?" } @$cols), |
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$id_col); |
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push @update_fields, [ @$fields, 0 ]; |
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} |
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} |
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|
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{ |
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EXPORTER => $exporter, |
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INSERT_FIELDS => \@insert_fields, INSERTS => \@inserts, |
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UPDATE_FIELDS => \@update_fields, UPDATES => \@updates, |
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} |
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}; |
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} |
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|
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sub get_instance_select |
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{ |
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my ($self, $class) = @_; |
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|
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return $self->{CLASSES}{$class}{INSTANCE_SELECT} ||= do { |
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my $schema = $self->{SCHEMA}; |
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my $id_col = $schema->{sql}{id_col}; |
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my $context = { engine => $self, schema => $schema, layout1 => $self->{layout1} }; |
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my @cols; |
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|
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for my $part ($self->get_parts($class)) { |
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my $table = $part->{table}; |
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$context->{class} = $part; |
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push @cols, map { "$table.$_" } map { $_->get_import_cols($context) } $part->direct_fields() |
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} |
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|
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my ($first_table, @other_tables) = $self->get_table_set($class)->tables(); |
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|
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sprintf("SELECT %s FROM %s WHERE %s", |
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join(', ', @cols), |
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join(', ', $first_table, @other_tables), |
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join(' AND ', "$first_table.$id_col = ?", map { "$first_table.$id_col = $_.$id_col" } @other_tables)); |
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}; |
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} |
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|
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sub get_polymorphic_select |
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{ |
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my ($self, $class, $storage) = @_; |
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|
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my $selects = $self->{CLASSES}{$class}{POLYMORPHIC_SELECT} ||= do { |
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my $schema = $self->{SCHEMA}; |
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my $id_col = $schema->{sql}{id_col}; |
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my $type_col = $self->{TYPE_COL}; |
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my $context = { engine => $self, schema => $schema, layout1 => $self->{layout1} }; |
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|
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my $table_set = $self->get_table_set($class); |
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my %base_tables = do { my $ph = 0; map { $_ => $ph++ } $table_set->tables() }; |
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|
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my %partition; |
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|
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$class->for_conforming(sub { |
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my $class = shift; |
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push @{ $partition{ $self->get_table_set($class)->key } }, $class |
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unless $class->{abstract}; |
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} ); |
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|
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my @selects; |
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|
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for my $table_set_key (keys %partition) { |
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|
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my $mates = $partition{$table_set_key}; |
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|
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my %slice; |
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my %col_index; |
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my $col_mark = 0; |
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my (@cols, @expand); |
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|
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my @tables = $self->get_table_set($mates->[0])->tables(); |
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|
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my $root_table = $tables[0]; |
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push @cols, qualify($id_col, $root_table, \%base_tables, \@expand); |
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push @cols, qualify($type_col, $root_table, \%base_tables, \@expand); |
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|
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my %used; |
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$used{$root_table} += 2; |
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|
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for my $class (@$mates) { |
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my @slice; |
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|
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for my $part ($self->get_parts($class)) { |
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my $table = $part->{table}; |
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$context->{class} = $part; |
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|
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for my $field ($part->direct_fields()) { |
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my @import_cols = $field->get_import_cols($context); |
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$used{$table} += @import_cols; |
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|
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for my $col (@import_cols) { |
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my $qualified_col = "$table.$col"; |
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unless (exists $col_index{$qualified_col}) { |
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push @cols, qualify($col, $table, \%base_tables, \@expand); |
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$col_index{$qualified_col} = $col_mark++; |
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} |
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|
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push @slice, $col_index{$qualified_col}; |
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} |
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} |
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} |
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|
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$slice{ $storage->{class2id}{$class->{name}} || $class->{id} } = \@slice; # should be $class->{id} (compat) |
| 308 |
} |
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|
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my @from; |
| 311 |
|
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for my $table (@tables) { |
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next unless $used{$table}; |
| 314 |
if (exists $base_tables{$table}) { |
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push @expand, $base_tables{$table}; |
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push @from, "$table t%d"; |
| 317 |
} else { |
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push @from, $table; |
| 319 |
} |
| 320 |
} |
| 321 |
|
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my @where = map { |
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qualify($id_col, $root_table, \%base_tables, \@expand) . ' = ' . qualify($id_col, $_, \%base_tables, \@expand) |
| 324 |
} grep { $used{$_} } @tables[1..$#tables]; |
| 325 |
|
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unless (@$mates == $self->{HETEROGENEITY}{$table_set_key}) { |
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push @where, sprintf "%s IN (%s)", qualify($type_col, $root_table, \%base_tables, \@expand), |
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join ', ', map { |
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$storage->{class2id}{$_->{name}} or $_->{id} # try $storage first for compatibility with layout1 |
| 330 |
} @$mates |
| 331 |
} |
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|
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push @selects, Tangram::Relational::PolySelectTemplate->new(\@expand, \@cols, \@from, \@where, \%slice); |
| 334 |
} |
| 335 |
|
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\@selects; |
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}; |
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|
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return @$selects; |
| 340 |
} |
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|
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sub qualify |
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{ |
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my ($col, $table, $ph, $expand) = @_; |
| 345 |
|
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if (exists $ph->{$table}) { |
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push @$expand, $ph->{$table}; |
| 348 |
return "t%d.$col"; |
| 349 |
} else { |
| 350 |
return "$table.$col"; |
| 351 |
} |
| 352 |
} |
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|
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sub get_import_cache |
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{ |
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my ($self, $class) = @_; |
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|
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return $self->{CLASSES}{$class}{IMPORTER} ||= |
| 359 |
do { |
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my $schema = $self->{SCHEMA}; |
| 361 |
|
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my $context = { schema => $schema, layout1 => $self->{layout1} }; |
| 363 |
|
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my (@import_sources, @import_closures); |
| 365 |
|
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for my $part ($self->get_parts($class)) { |
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my $table_name = $part->{table}; |
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|
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$context->{class} = $part; |
| 370 |
|
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for my $field ($part->direct_fields) { |
| 372 |
|
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my $importer = $field->get_importer($context) |
| 374 |
or next; |
| 375 |
|
| 376 |
if (ref $importer) { |
| 377 |
push @import_closures, $importer; |
| 378 |
push @import_sources, 'shift(@closures)->($obj, $row, $context)'; |
| 379 |
} else { |
| 380 |
push @import_sources, $importer; |
| 381 |
} |
| 382 |
} |
| 383 |
} |
| 384 |
|
| 385 |
my $import_source = join ";\n", @import_sources; |
| 386 |
my $copy_closures = @import_closures ? ' my @closures = @import_closures;' : ''; |
| 387 |
|
| 388 |
# $Tangram::TRACE = \*STDOUT; |
| 389 |
|
| 390 |
$import_source = "sub { my (\$obj, \$row, \$context) = \@_;$copy_closures\n$import_source }"; |
| 391 |
|
| 392 |
print $Tangram::TRACE "Compiling importer for $class->{name}...\n$import_source\n" |
| 393 |
if $Tangram::TRACE; |
| 394 |
|
| 395 |
# use Data::Dumper; print Dumper \@cols; |
| 396 |
eval $import_source or die; |
| 397 |
}; |
| 398 |
} |
| 399 |
|
| 400 |
sub get_deletes |
| 401 |
{ |
| 402 |
my ($self, $class) = @_; |
| 403 |
|
| 404 |
return $self->{CLASSES}{$class}{DELETES} ||= do { |
| 405 |
my $id_col = $self->{SCHEMA}{sql}{id_col}; |
| 406 |
[ map { "DELETE FROM $_ WHERE $id_col = ?" } $self->get_table_set($class)->tables() ] |
| 407 |
}; |
| 408 |
} |
| 409 |
|
| 410 |
sub deploy |
| 411 |
{ |
| 412 |
my ($self, $out) = @_; |
| 413 |
$self->relational_schema()->deploy($out); |
| 414 |
} |
| 415 |
|
| 416 |
sub retreat |
| 417 |
{ |
| 418 |
my ($self, $out) = @_; |
| 419 |
$self->relational_schema()->retreat($out); |
| 420 |
} |
| 421 |
|
| 422 |
sub get_deploy_info |
| 423 |
{ |
| 424 |
my ($self) = @_; |
| 425 |
return { LAYOUT => 2, ENGINE => ref($self), ENGINE_LAYOUT => 1 }; |
| 426 |
} |
| 427 |
|
| 428 |
sub relational_schema |
| 429 |
{ |
| 430 |
my ($self) = @_; |
| 431 |
|
| 432 |
my $schema = $self->{SCHEMA}; |
| 433 |
my $classes = $schema->{classes}; |
| 434 |
my $tables = {}; |
| 435 |
|
| 436 |
foreach my $class (keys %{$schema->{classes}}) { |
| 437 |
|
| 438 |
my $classdef = $classes->{$class}; |
| 439 |
my $tabledef = $tables->{ $classdef->{table} } ||= {}; |
| 440 |
my $cols = $tabledef->{COLS} ||= {}; |
| 441 |
|
| 442 |
$cols->{ $schema->{sql}{id_col} } = $schema->{sql}{id}; |
| 443 |
|
| 444 |
$cols->{ $schema->{sql}{class_col} || 'type' } = $schema->{sql}{cid} if $self->{ROOT_TABLES}{$classdef->{table}}; |
| 445 |
|
| 446 |
$tables->{$class}->{SQL} = $classdef->{sql} if $classdef->{sql}; |
| 447 |
|
| 448 |
foreach my $typetag (keys %{$classdef->{members}}) |
| 449 |
{ |
| 450 |
my $members = $classdef->{members}{$typetag}; |
| 451 |
my $type = $schema->{types}{$typetag}; |
| 452 |
|
| 453 |
$type->coldefs($tabledef->{COLS}, $members, $schema, $class, $tables); |
| 454 |
} |
| 455 |
} |
| 456 |
|
| 457 |
delete @$tables{ grep { 1 == keys %{ $tables->{$_}{COLS} } } keys %$tables }; |
| 458 |
|
| 459 |
return bless [ $tables, $self ], 'Tangram::RelationalSchema'; |
| 460 |
} |
| 461 |
|
| 462 |
sub Tangram::Scalar::_coldefs |
| 463 |
{ |
| 464 |
my ($self, $cols, $members, $sql, $schema) = @_; |
| 465 |
|
| 466 |
for my $def (values %$members) |
| 467 |
{ |
| 468 |
$cols->{ $def->{col} } = $def->{sql} || "$sql $schema->{sql}{default_null}"; |
| 469 |
} |
| 470 |
} |
| 471 |
sub Tangram::Integer::coldefs |
| 472 |
{ |
| 473 |
my ($self, $cols, $members, $schema) = @_; |
| 474 |
$self->_coldefs($cols, $members, 'INT', $schema); |
| 475 |
} |
| 476 |
|
| 477 |
sub Tangram::Real::coldefs |
| 478 |
{ |
| 479 |
my ($self, $cols, $members, $schema) = @_; |
| 480 |
$self->_coldefs($cols, $members, 'REAL', $schema); |
| 481 |
} |
| 482 |
|
| 483 |
# sub Tangram::Ref::coldefs |
| 484 |
# { |
| 485 |
# my ($self, $cols, $members, $schema) = @_; |
| 486 |
|
| 487 |
# for my $def (values %$members) |
| 488 |
# { |
| 489 |
# $cols->{ $def->{col} } = !exists($def->{null}) || $def->{null} |
| 490 |
# ? "$schema->{sql}{id} $schema->{sql}{default_null}" |
| 491 |
# : $schema->{sql}{id}; |
| 492 |
# } |
| 493 |
# } |
| 494 |
|
| 495 |
sub Tangram::String::coldefs |
| 496 |
{ |
| 497 |
my ($self, $cols, $members, $schema) = @_; |
| 498 |
$self->_coldefs($cols, $members, 'VARCHAR(255)', $schema); |
| 499 |
} |
| 500 |
|
| 501 |
sub Tangram::Set::coldefs |
| 502 |
{ |
| 503 |
my ($self, $cols, $members, $schema, $class, $tables) = @_; |
| 504 |
|
| 505 |
foreach my $member (values %$members) |
| 506 |
{ |
| 507 |
$tables->{ $member->{table} }{COLS} = |
| 508 |
{ |
| 509 |
$member->{coll} => $schema->{sql}{id}, |
| 510 |
$member->{item} => $schema->{sql}{id}, |
| 511 |
}; |
| 512 |
} |
| 513 |
} |
| 514 |
|
| 515 |
sub Tangram::IntrSet::coldefs |
| 516 |
{ |
| 517 |
my ($self, $cols, $members, $schema, $class, $tables) = @_; |
| 518 |
|
| 519 |
foreach my $member (values %$members) |
| 520 |
{ |
| 521 |
my $table = $tables->{ $schema->{classes}{$member->{class}}{table} } ||= {}; |
| 522 |
$table->{COLS}{$member->{coll}} = "$schema->{sql}{id} $schema->{sql}{default_null}"; |
| 523 |
} |
| 524 |
} |
| 525 |
|
| 526 |
sub Tangram::Array::coldefs |
| 527 |
{ |
| 528 |
my ($self, $cols, $members, $schema, $class, $tables) = @_; |
| 529 |
|
| 530 |
foreach my $member (values %$members) |
| 531 |
{ |
| 532 |
$tables->{ $member->{table} }{COLS} = |
| 533 |
{ |
| 534 |
$member->{coll} => $schema->{sql}{id}, |
| 535 |
$member->{item} => $schema->{sql}{id}, |
| 536 |
$member->{slot} => "INT $schema->{sql}{default_null}" |
| 537 |
}; |
| 538 |
} |
| 539 |
} |
| 540 |
|
| 541 |
sub Tangram::Hash::coldefs |
| 542 |
{ |
| 543 |
my ($self, $cols, $members, $schema, $class, $tables) = @_; |
| 544 |
|
| 545 |
foreach my $member (values %$members) |
| 546 |
{ |
| 547 |
$tables->{ $member->{table} }{COLS} = |
| 548 |
{ |
| 549 |
$member->{coll} => $schema->{sql}{id}, |
| 550 |
$member->{item} => $schema->{sql}{id}, |
| 551 |
$member->{slot} => "VARCHAR(255) $schema->{sql}{default_null}" |
| 552 |
}; |
| 553 |
} |
| 554 |
} |
| 555 |
|
| 556 |
sub Tangram::IntrArray::coldefs |
| 557 |
{ |
| 558 |
my ($self, $cols, $members, $schema, $class, $tables) = @_; |
| 559 |
|
| 560 |
foreach my $member (values %$members) |
| 561 |
{ |
| 562 |
my $table = $tables->{ $schema->{classes}{$member->{class}}{table} } ||= {}; |
| 563 |
$table->{COLS}{$member->{coll}} = "$schema->{sql}{id} $schema->{sql}{default_null}"; |
| 564 |
$table->{COLS}{$member->{slot}} = "INT $schema->{sql}{default_null}"; |
| 565 |
} |
| 566 |
} |
| 567 |
|
| 568 |
sub Tangram::HashRef::coldefs |
| 569 |
{ |
| 570 |
#later |
| 571 |
} |
| 572 |
|
| 573 |
sub Tangram::BackRef::coldefs |
| 574 |
{ |
| 575 |
return (); |
| 576 |
} |
| 577 |
|
| 578 |
package Tangram::RelationalSchema; |
| 579 |
|
| 580 |
sub _deploy_do |
| 581 |
{ |
| 582 |
my $output = shift; |
| 583 |
|
| 584 |
return ref($output) && eval { $output->isa('DBI::db') } |
| 585 |
? sub { print $Tangram::TRACE @_, "\n" if $Tangram::TRACE; |
| 586 |
$output->do( join '', @_ ); } |
| 587 |
: sub { print $output @_, ";\n\n" }; |
| 588 |
} |
| 589 |
|
| 590 |
sub deploy |
| 591 |
{ |
| 592 |
my ($self, $output) = @_; |
| 593 |
my ($tables, $engine) = @$self; |
| 594 |
my $schema = $engine->{SCHEMA}; |
| 595 |
|
| 596 |
$output ||= \*STDOUT; |
| 597 |
|
| 598 |
my $do = _deploy_do($output); |
| 599 |
|
| 600 |
foreach my $table (sort keys %$tables) |
| 601 |
{ |
| 602 |
my $def = $tables->{$table}; |
| 603 |
my $cols = $def->{COLS}; |
| 604 |
my $sql = $def->{SQL}; |
| 605 |
|
| 606 |
my @base_cols; |
| 607 |
my $id_col = $schema->{sql}{id_col}; |
| 608 |
my $class_col = $schema->{sql}{class_col} || 'type'; |
| 609 |
my $table_type = $sql->{table_type} || $schema->{sql}{table_type}; |
| 610 |
|
| 611 |
push @base_cols, "$id_col $schema->{sql}{id} NOT NULL,\n PRIMARY KEY( id )" if exists $cols->{$id_col}; |
| 612 |
push @base_cols, "$class_col $schema->{sql}{cid} NOT NULL" if exists $cols->{$class_col}; |
| 613 |
|
| 614 |
delete @$cols{$id_col}; |
| 615 |
delete @$cols{$class_col}; |
| 616 |
|
| 617 |
$do->("CREATE TABLE $table\n(\n ", |
| 618 |
join( ",\n ", @base_cols, map { "$_ $cols->{$_}" } keys %$cols ), |
| 619 |
"\n)", ($table_type ? " TYPE=$table_type" : '') ); |
| 620 |
} |
| 621 |
|
| 622 |
my $table_type = $schema->{sql}{table_type}; |
| 623 |
my $control_type = ($table_type ? " TYPE=$table_type" : ''); |
| 624 |
my $control = $schema->{control}; |
| 625 |
|
| 626 |
$do->( <<SQL ); |
| 627 |
CREATE TABLE $control |
| 628 |
( |
| 629 |
layout INTEGER NOT NULL, |
| 630 |
engine VARCHAR(255), |
| 631 |
engine_layout INTEGER, |
| 632 |
mark INTEGER NOT NULL |
| 633 |
) |
| 634 |
$control_type |
| 635 |
SQL |
| 636 |
|
| 637 |
my $info = $engine->get_deploy_info(); |
| 638 |
my ($l) = split '\.', $Tangram::VERSION; |
| 639 |
|
| 640 |
$do->("INSERT INTO $control (layout, engine, engine_layout, mark) VALUES ($info->{LAYOUT}, '$info->{ENGINE}', $info->{ENGINE_LAYOUT}, 0)"); |
| 641 |
} |
| 642 |
|
| 643 |
sub retreat |
| 644 |
{ |
| 645 |
my ($self, $output) = @_; |
| 646 |
my ($tables, $engine) = @$self; |
| 647 |
my $schema = $engine->{SCHEMA}; |
| 648 |
|
| 649 |
$output ||= \*STDOUT; |
| 650 |
|
| 651 |
my $do = _deploy_do($output); |
| 652 |
|
| 653 |
for my $table (sort keys %$tables, $schema->{control}) |
| 654 |
{ |
| 655 |
$do->( "DROP TABLE $table" ); |
| 656 |
} |
| 657 |
} |
| 658 |
|
| 659 |
sub classids |
| 660 |
{ |
| 661 |
my ($self) = @_; |
| 662 |
my ($tables, $schema) = @$self; |
| 663 |
my $classes = $schema->{classes}; |
| 664 |
# use Data::Dumper; |
| 665 |
return { map { $_ => $classes->{$_}{id} } keys %$classes }; |
| 666 |
} |
| 667 |
|
| 668 |
package Tangram::Relational::PolySelectTemplate; |
| 669 |
|
| 670 |
sub new |
| 671 |
{ |
| 672 |
my $class = shift; |
| 673 |
bless [ @_ ], $class; |
| 674 |
} |
| 675 |
|
| 676 |
sub instantiate |
| 677 |
{ |
| 678 |
my ($self, $remote, $xcols, $xfrom, $xwhere) = @_; |
| 679 |
my ($expand, $cols, $from, $where) = @$self; |
| 680 |
|
| 681 |
$xcols ||= []; |
| 682 |
$xfrom ||= []; |
| 683 |
|
| 684 |
my @xwhere; |
| 685 |
|
| 686 |
if (@$xwhere) { |
| 687 |
$xwhere[0] = join ' AND ', @$xwhere; |
| 688 |
$xwhere[0] =~ s[%][%%]g; |
| 689 |
} |
| 690 |
|
| 691 |
my @tables = $remote->table_ids(); |
| 692 |
|
| 693 |
my $select = sprintf "SELECT %s\n FROM %s", join(', ', @$cols, @$xcols), join(', ', @$from, @$xfrom); |
| 694 |
|
| 695 |
$select = sprintf "%s\n WHERE %s", $select, join(' AND ', @$where, @xwhere) |
| 696 |
if @$where || @$xwhere; |
| 697 |
|
| 698 |
sprintf $select, map { $tables[$_] } @$expand; |
| 699 |
} |
| 700 |
|
| 701 |
sub extract |
| 702 |
{ |
| 703 |
my ($self, $row) = @_; |
| 704 |
my $id = shift @$row; |
| 705 |
my $class_id = shift @$row; |
| 706 |
my $slice = $self->[-1]{$class_id} or Carp::croak "unexpected class id '$class_id'"; |
| 707 |
my $state = [ @$row[ @$slice ] ]; |
| 708 |
splice @$row, 0, @{ $self->[1] } - 2; |
| 709 |
return ($id, $class_id, $state); |
| 710 |
} |
| 711 |
|
| 712 |
1; |
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