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package Basset::DB::Table::View; |
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#Basset::DB::Table::View, copyright and (c) 2004 James A Thomason III |
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#Basset::DB::Table is distributed under the terms of the Perl Artistic License. |
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$VERSION = '1.00'; |
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use Basset::DB::Table; |
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@ISA = qw(Basset::DB::Table); |
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use strict; |
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use warnings; |
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=pod |
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=head1 NAME |
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Basset::DB::Table::View - used to define virtual views to your objects. |
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=head1 AUTHOR |
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Jim Thomason, jim@jimandkoka.com |
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=head1 SYNOPSIS |
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For example, |
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my $table = Basset::DB::Table::View->new( |
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'name' => 'user', |
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'primary_column' => 'id', |
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'select_query' => <<' eSQL', |
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select |
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user.id, |
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name, |
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count(*) as movies |
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from |
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user, movies |
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where |
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user.id = movies.user |
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and user.id = ? |
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group by |
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user.id, name |
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eSQL |
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'definition' => { |
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'id' => 'SQL_INTEGER', |
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'name' => 'SQL_VARCHAR', |
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'movies' => 'SQL_INTEGER', |
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} |
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); |
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Some::Class->add_primarytable($table); |
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my $object = Some::Class->load(1); #load by user 1 |
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print $object->id, "\n"; #id (user id) |
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print $object->name, "\n"; #"Jack Sprat" |
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print $object->movies, "\n"; #145 (he owns 145 movies) |
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=head1 DESCRIPTION |
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Basset::DB::Table::View provides an abstract and consistent location for defining database views. Normally, |
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your objects are mapped to tables (most frequently in a 1-1 manner), but sometimes it's convenient to hide |
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a view of data behind an object. This way you can access a complex data query as if it were an object. |
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Basset::DB::Table::View as your primary table allows you to do that. |
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Naturally, by virtue of the fact that these are potentially complex queries, objects that use view tables |
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are read-only. |
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=cut |
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=pod |
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=head1 ATTRIBUTES |
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=over |
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=cut |
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=pod |
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=item select_query |
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In view tables, the select_query is an attribute, not a method. You should explicitly define the select query that is |
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used by this table view. |
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$table->select_query('select * from somewhere'); |
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=cut |
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__PACKAGE__->add_attr('select_query'); |
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=pod |
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=begin btest select_query |
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my $o = __PACKAGE__->new(); |
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$test->ok($o, "Got object"); |
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$test->is(scalar(__PACKAGE__->select_query), undef, "could not call object method as class method"); |
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$test->is(__PACKAGE__->errcode, "BO-08", "proper error code"); |
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$test->is(scalar($o->select_query), undef, 'select_query is undefined'); |
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$test->is($o->select_query('abc'), 'abc', 'set select_query to abc'); |
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$test->is($o->select_query(), 'abc', 'read value of select_query - abc'); |
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my $h = {}; |
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$test->ok($h, 'got hashref'); |
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$test->is($o->select_query($h), $h, 'set select_query to hashref'); |
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$test->is($o->select_query(), $h, 'read value of select_query - hashref'); |
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my $a = []; |
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$test->ok($a, 'got arrayref'); |
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$test->is($o->select_query($a), $a, 'set select_query to arrayref'); |
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$test->is($o->select_query(), $a, 'read value of select_query - arrayref'); |
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=end btest |
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=back |
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=cut |
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sub insert_query { |
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return shift->error("Views cannot insert", "BDTV-01"); |
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} |
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=pod |
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=begin btest insert_query |
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my $o = __PACKAGE__->new(); |
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$test->ok($o, "got object"); |
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$test->ok(! $o->insert_query, "Cannot call insert_query"); |
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$test->is($o->errcode, "BDTV-01", "proper error code"); |
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=end btest |
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=cut |
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sub replace_query { |
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return shift->error("Views cannot replace", "BDTV-02"); |
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} |
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=pod |
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=begin btest replace_query |
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my $o = __PACKAGE__->new(); |
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$test->ok($o, "got object"); |
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$test->ok(! $o->replace_query, "Cannot call replace_query"); |
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$test->is($o->errcode, "BDTV-02", "proper error code"); |
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=end btest |
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=cut |
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sub update_query { |
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return shift->error("Views cannot update", "BDTV-03"); |
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} |
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=pod |
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=begin btest update_query |
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my $o = __PACKAGE__->new(); |
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$test->ok($o, "got object"); |
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$test->ok(! $o->update_query, "Cannot call update_query"); |
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$test->is($o->errcode, "BDTV-03", "proper error code"); |
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=end btest |
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=cut |
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sub delete_query { |
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return shift->error("Views cannot delete", "BDTV-04"); |
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} |
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=pod |
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=begin btest delete_query |
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my $o = __PACKAGE__->new(); |
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$test->ok($o, "got object"); |
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$test->ok(! $o->delete_query, "Cannot call delete_query"); |
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$test->is($o->errcode, "BDTV-04", "proper error code"); |
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=end btest |
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=cut |
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sub multiselect_query { |
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return shift->error("Views cannot multiselect", "BDTV-05"); |
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} |
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=pod |
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=begin btest multiselect_query |
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my $o = __PACKAGE__->new(); |
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$test->ok($o, "got object"); |
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$test->ok(! $o->multiselect_query, "Cannot call multiselect_query"); |
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$test->is($o->errcode, "BDTV-05", "proper error code"); |
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=end btest |
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=cut |
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sub attach_to_query { |
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my $self = shift; |
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my $query = shift; |
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return $self->SUPER::attach_to_query($query); |
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} |
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=pod |
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=begin btest attach_to_query |
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my $o = __PACKAGE__->new(); |
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$test->ok($o, "got object"); |
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$test->ok(! $o->attach_to_query, "cannot attach to query w/o query"); |
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$test->is($o->errcode, "BDT-02", "proper error code"); |
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$test->is($o->attach_to_query('foo'), 'foo', 'query returns query'); |
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$test->is($o->attach_to_query('foo', {}), 'foo', 'query returns query'); |
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$test->is($o->attach_to_query('foo', {'where' => '2 > 1'}), 'foo', 'query returns query'); |
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=end btest |
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=cut |
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1; |