are in any way unsure about the use of the attributes above (C< join
>, C< select >, C< as > and C< group_by >).
+=head2 Subqueries
+
+You can write subqueries relatively easily in DBIC.
+
+ my $inside_rs = $schema->resultset('Artist')->search({
+ name => [ 'Billy Joel', 'Brittany Spears' ],
+ });
+
+ my $rs = $schema->resulset('CD')->search({
+ artist_id => { 'IN' => $inside_rs->get_column('id')->as_query },
+ });
+
+The usual operators ( =, !=, IN, NOT IN, etc) are supported.
+
+B<NOTE>: You have to explicitly use '=' when doing an equality comparison.
+The following will B<not> work:
+
+ my $rs = $schema->resulset('CD')->search({
+ artist_id => $inside_rs->get_column('id')->as_query,
+ });
+
=head2 Predefined searches
You can write your own L<DBIx::Class::ResultSet> class by inheriting from it
return \%unaliased;
}
+=head2 as_query
+
+=over 4
+
+=item Arguments: none
+
+=item Return Value: \[ $sql, @bind ]
+
+=back
+
+Returns the SQL query and bind vars associated with the invocant.
+
+This is generally used as the RHS for a subquery.
+
+=cut
+
+sub as_query { return shift->cursor->as_query(@_) }
+
=head2 find_or_new
=over 4
return $new;
}
+=head2 as_query
+
+=over 4
+
+=item Arguments: none
+
+=item Return Value: \[ $sql, @bind ]
+
+=back
+
+Returns the SQL query and bind vars associated with the invocant.
+
+This is generally used as the RHS for a subquery.
+
+=cut
+
+sub as_query { return shift->_resultset->as_query }
+
=head2 next
=over 4
);
}
-
1;
=head1 AUTHORS
sub _prep_for_execute {
my ($self, $op, $extra_bind, $ident, $args) = @_;
+ if( blessed($ident) && $ident->isa("DBIx::Class::ResultSource") ) {
+ $ident = $ident->from();
+ }
+
my ($sql, @bind) = $self->sql_maker->$op($ident, @$args);
+
unshift(@bind,
map { ref $_ eq 'ARRAY' ? $_ : [ '!!dummy', $_ ] } @$extra_bind)
if $extra_bind;
-
return ($sql, \@bind);
}
sub _dbh_execute {
my ($self, $dbh, $op, $extra_bind, $ident, $bind_attributes, @args) = @_;
- if( blessed($ident) && $ident->isa("DBIx::Class::ResultSource") ) {
- $ident = $ident->from();
- }
-
my ($sql, $bind) = $self->_prep_for_execute($op, $extra_bind, $ident, \@args);
$self->_query_start( $sql, @$bind );
}
sub _select {
+ my $self = shift;
+ my $sql_maker = $self->sql_maker;
+ local $sql_maker->{for};
+ return $self->_execute($self->_select_args(@_));
+}
+
+sub _select_args {
my ($self, $ident, $select, $condition, $attrs) = @_;
my $order = $attrs->{order_by};
push @args, $attrs->{rows}, $attrs->{offset};
}
- return $self->_execute(@args);
+ return @args;
}
sub source_bind_attributes {
return bless ($new, $class);
}
+=head2 as_query
+
+=over 4
+
+=item Arguments: none
+
+=item Return Value: \[ $sql, @bind ]
+
+=back
+
+Returns the SQL statement and bind vars associated with the invocant.
+
+=cut
+
+sub as_query {
+ my $self = shift;
+
+ my $storage = $self->{storage};
+ my $sql_maker = $storage->sql_maker;
+ local $sql_maker->{for};
+
+ my @args = $storage->_select_args(@{$self->{args}});
+ my ($sql, $bind) = $storage->_prep_for_execute(@args[0 .. 2], [@args[4 .. $#args]]);
+ return \[ $sql, @$bind ];
+}
+
=head2 next
=over 4
--- /dev/null
+#!/usr/bin/perl
+
+use strict;
+use warnings FATAL => 'all';
+
+use Data::Dumper;
+
+use Test::More;
+use lib qw(t/lib);
+use DBICTest;
+use DBIC::SqlMakerTest;
+
+plan tests => 5;
+
+my $schema = DBICTest->init_schema();
+my $art_rs = $schema->resultset('Artist');
+my $cdrs = $schema->resultset('CD');
+
+{
+ my $arr = $art_rs->as_query;
+ my ($query, @bind) = @{$$arr};
+
+ is_same_sql_bind(
+ $query, \@bind,
+ "SELECT me.artistid, me.name, me.rank, me.charfield FROM artist me", [],
+ );
+}
+
+$art_rs = $art_rs->search({ name => 'Billy Joel' });
+
+{
+ my $arr = $art_rs->as_query;
+ my ($query, @bind) = @{$$arr};
+
+ is_same_sql_bind(
+ $query, \@bind,
+ "SELECT me.artistid, me.name, me.rank, me.charfield FROM artist me WHERE ( name = ? )",
+ [ [ name => 'Billy Joel' ] ],
+ );
+}
+
+$art_rs = $art_rs->search({ rank => 2 });
+
+{
+ my $arr = $art_rs->as_query;
+ my ($query, @bind) = @{$$arr};
+
+ is_same_sql_bind(
+ $query, \@bind,
+ "SELECT me.artistid, me.name, me.rank, me.charfield FROM artist me WHERE ( ( rank = ? ) AND ( name = ? ) )",
+ [ [ rank => 2 ], [ name => 'Billy Joel' ] ],
+ );
+}
+
+my $rscol = $art_rs->get_column( 'charfield' );
+
+{
+ my $arr = $rscol->as_query;
+ my ($query, @bind) = @{$$arr};
+
+ is_same_sql_bind(
+ $query, \@bind,
+ "SELECT me.charfield FROM artist me WHERE ( ( ( rank = ? ) AND ( name = ? ) ) )",
+ [ [ rank => 2 ], [ name => 'Billy Joel' ] ],
+ );
+}
+
+# This is an actual subquery.
+{
+ my $cdrs2 = $cdrs->search({
+ artist_id => { 'in' => $art_rs->search({}, { rows => 1 })->get_column( 'id' )->as_query },
+ });
+
+ my $arr = $cdrs2->as_query;
+ my ($query, @bind) = @{$$arr};
+ is_same_sql_bind(
+ $query, \@bind,
+ "SELECT me.cdid,me.artist,me.title,me.year,me.genreid,me.single_track FROM cd me WHERE artist_id IN ( SELECT id FROM artist me WHERE ( rank = ? ) AND ( name = ? ) LIMIT 1 )",
+ [ [ rank => 2 ], [ name => 'Billy Joel' ] ],
+ );
+}
+
+__END__
projects / dbsrgits/DBIx-Class.git / commitdiff