=head1 METHODS
-=head2 new
+=head2 new
=over 4
# year = 2005 OR year = 2004
If you need to pass in additional attributes but no additional condition,
-call it as C<search(undef, \%attrs);>.
+call it as C<search(undef, \%attrs)>.
# "SELECT name, artistid FROM $artist_table"
my @all_artists = $schema->resultset('Artist')->search(undef, {
sub search {
my $self = shift;
-
- my $rs;
- if( @_ ) {
- my $attrs = { %{$self->{attrs}} };
- my $having = delete $attrs->{having};
- $attrs = { %$attrs, %{ pop(@_) } } if @_ > 1 and ref $_[$#_] eq 'HASH';
-
- my $where = (@_
- ? ((@_ == 1 || ref $_[0] eq "HASH")
- ? shift
- : ((@_ % 2)
- ? $self->throw_exception(
- "Odd number of arguments to search")
- : {@_}))
- : undef());
- if (defined $where) {
- $attrs->{where} = (defined $attrs->{where}
- ? { '-and' =>
- [ map { ref $_ eq 'ARRAY' ? [ -or => $_ ] : $_ }
- $where, $attrs->{where} ] }
- : $where);
- }
-
- if (defined $having) {
- $attrs->{having} = (defined $attrs->{having}
- ? { '-and' =>
- [ map { ref $_ eq 'ARRAY' ? [ -or => $_ ] : $_ }
- $having, $attrs->{having} ] }
- : $having);
- }
+ my $attrs = { %{$self->{attrs}} };
+ my $having = delete $attrs->{having};
+ $attrs = { %$attrs, %{ pop(@_) } } if @_ > 1 and ref $_[$#_] eq 'HASH';
+
+ my $where = (@_
+ ? ((@_ == 1 || ref $_[0] eq "HASH")
+ ? shift
+ : ((@_ % 2)
+ ? $self->throw_exception(
+ "Odd number of arguments to search")
+ : {@_}))
+ : undef());
+ if (defined $where) {
+ $attrs->{where} = (defined $attrs->{where}
+ ? { '-and' =>
+ [ map { ref $_ eq 'ARRAY' ? [ -or => $_ ] : $_ }
+ $where, $attrs->{where} ] }
+ : $where);
+ }
- $rs = (ref $self)->new($self->result_source, $attrs);
+ if (defined $having) {
+ $attrs->{having} = (defined $attrs->{having}
+ ? { '-and' =>
+ [ map { ref $_ eq 'ARRAY' ? [ -or => $_ ] : $_ }
+ $having, $attrs->{having} ] }
+ : $having);
}
- else {
- $rs = $self;
- $rs->reset;
+
+ my $rs = (ref $self)->new($self->result_source, $attrs);
+
+ unless (@_) { # no search, effectively just a clone
+ my $rows = $self->get_cache;
+ if ($rows) {
+ $rs->set_cache($rows);
+ }
}
+
return (wantarray ? $rs->all : $rs);
}
=over 4
-=item Arguments: (@values | \%cols), \%attrs?
+=item Arguments: @values | \%cols, \%attrs?
=item Return Value: $row_object
return keys %{$rs->{collapse}} ? $rs->next : $rs->single;
} else {
return keys %{$self->{collapse}} ?
- $self->search($query)->next :
- $self->single($query);
+ $self->search($query)->next :
+ $self->single($query);
}
}
name => 'Emo-R-Us',
});
-Search the specified relationship, optionally specify a condition and
+Searches the specified relationship, optionally specifying a condition and
attributes for matching records. See L</ATTRIBUTES> for more information.
=cut
if ($where) {
if (defined $attrs->{where}) {
$attrs->{where} = {
- '-and' =>
+ '-and' =>
[ map { ref $_ eq 'ARRAY' ? [ -or => $_ ] : $_ }
$where, delete $attrs->{where} ]
};
# WHERE title LIKE '%blue%'
$cd_rs = $rs->search_like({ title => '%blue%'});
-Perform a search, but use C<LIKE> instead of C<=> as the condition. Note
+Performs a search, but uses C<LIKE> instead of C<=> as the condition. Note
that this is simply a convenience method. You most likely want to use
L</search> with specific operators.
=back
Returns a resultset or object list representing a subset of elements from the
-resultset slice is called on. Indexes are from 0 - i.e. to get the first
-three records, call
+resultset slice is called on. Indexes are from 0, i.e., to get the first
+three records, call:
my ($one, $two, $three) = $rs->slice(0, 2);
sub slice {
my ($self, $min, $max) = @_;
- my $attrs = { %{ $self->{attrs} || {} } };
- $attrs->{offset} ||= 0;
+ my $attrs = {}; # = { %{ $self->{attrs} || {} } };
+ $attrs->{offset} = $self->{attrs}{offset} || 0;
$attrs->{offset} += $min;
$attrs->{rows} = ($max ? ($max - $min + 1) : 1);
- my $slice = (ref $self)->new($self->result_source, $attrs);
- return (wantarray ? $slice->all : $slice);
+ return $self->search(undef(), $attrs);
+ #my $slice = (ref $self)->new($self->result_source, $attrs);
+ #return (wantarray ? $slice->all : $slice);
}
=head2 next
print $cd->title;
}
+Note that you need to store the resultset object, and call C<next> on it.
+Calling C<< resultset('Table')->next >> repeatedly will always return the
+first record from the resultset.
+
=cut
sub next {
my ($self) = @_;
- if (@{$self->{all_cache} || []}) {
+ if (my $cache = $self->get_cache) {
$self->{all_cache_position} ||= 0;
- return $self->{all_cache}->[$self->{all_cache_position}++];
+ return $cache->[$self->{all_cache_position}++];
}
if ($self->{attrs}{cache}) {
$self->{all_cache_position} = 1;
return ($self->all)[0];
}
my @row = (exists $self->{stashed_row} ?
- @{delete $self->{stashed_row}} :
- $self->cursor->next
+ @{delete $self->{stashed_row}} :
+ $self->cursor->next
);
# warn Dumper(\@row); use Data::Dumper;
return unless (@row);
my @collapse;
if (defined $prefix) {
@collapse = map {
- m/^\Q${prefix}.\E(.+)$/ ? ($1) : ()
+ m/^\Q${prefix}.\E(.+)$/ ? ($1) : ()
} keys %{$self->{collapse}}
} else {
@collapse = keys %{$self->{collapse}};
my (@final, @raw);
while ( !(grep {
!defined($tree->[0]->{$_}) ||
- $co_check{$_} ne $tree->[0]->{$_}
+ $co_check{$_} ne $tree->[0]->{$_}
} @co_key) ) {
push(@final, $tree);
last unless (@raw = $self->cursor->next);
$row = $self->{stashed_row} = \@raw;
$tree = $self->_collapse_result($as, $row, $c_prefix);
- #warn Data::Dumper::Dumper($tree, $row);
}
- @$target = @final;
+ @$target = (@final ? @final : [ {}, {} ]);
+ # single empty result to indicate an empty prefetched has_many
}
return $info;
=over 4
-=item Arguments: ($cond, \%attrs?)?
+=item Arguments: $cond, \%attrs??
=item Return Value: $count
sub count {
my $self = shift;
return $self->search(@_)->count if @_ and defined $_[0];
- return scalar @{ $self->get_cache } if @{ $self->get_cache };
+ return scalar @{ $self->get_cache } if $self->get_cache;
my $count = $self->_count;
return 0 unless $count;
@distinct = ($column);
last;
}
- }
+ }
}
$select = { count => { distinct => \@distinct } };
sub all {
my ($self) = @_;
- return @{ $self->get_cache } if @{ $self->get_cache };
+ return @{ $self->get_cache } if $self->get_cache;
my @obj;
=back
Resets the resultset and returns an object for the first result (if the
-resultset contains anything).
+resultset returns anything).
=cut
return $_[0]->reset->next;
}
+# _cond_for_update_delete
+#
+# update/delete require the condition to be modified to handle
+# the differing SQL syntax available. This transforms the $self->{cond}
+# appropriately, returning the new condition.
+
+sub _cond_for_update_delete {
+ my ($self) = @_;
+ my $cond = {};
+
+ if (!ref($self->{cond})) {
+ # No-op. No condition, we're updating/deleting everything
+ }
+ elsif (ref $self->{cond} eq 'ARRAY') {
+ $cond = [
+ map {
+ my %hash;
+ foreach my $key (keys %{$_}) {
+ $key =~ /([^.]+)$/;
+ $hash{$1} = $_->{$key};
+ }
+ \%hash;
+ } @{$self->{cond}}
+ ];
+ }
+ elsif (ref $self->{cond} eq 'HASH') {
+ if ((keys %{$self->{cond}})[0] eq '-and') {
+ $cond->{-and} = [];
+
+ my @cond = @{$self->{cond}{-and}};
+ for (my $i = 0; $i < @cond - 1; $i++) {
+ my $entry = $cond[$i];
+
+ my %hash;
+ if (ref $entry eq 'HASH') {
+ foreach my $key (keys %{$entry}) {
+ $key =~ /([^.]+)$/;
+ $hash{$1} = $entry->{$key};
+ }
+ }
+ else {
+ $entry =~ /([^.]+)$/;
+ $hash{$entry} = $cond[++$i];
+ }
+
+ push @{$cond->{-and}}, \%hash;
+ }
+ }
+ else {
+ foreach my $key (keys %{$self->{cond}}) {
+ $key =~ /([^.]+)$/;
+ $cond->{$1} = $self->{cond}{$key};
+ }
+ }
+ }
+ else {
+ $self->throw_exception(
+ "Can't update/delete on resultset with condition unless hash or array"
+ );
+ }
+
+ return $cond;
+}
+
+
=head2 update
=over 4
my ($self, $values) = @_;
$self->throw_exception("Values for update must be a hash")
unless ref $values eq 'HASH';
+
+ my $cond = $self->_cond_for_update_delete;
+
return $self->result_source->storage->update(
- $self->result_source->from, $values, $self->{cond}
+ $self->result_source->from, $values, $cond
);
}
=back
-Fetches all objects and updates them one at a time. Note that C<update_all>
-will run cascade triggers while L</update> will not.
+Fetches all objects and updates them one at a time. Note that C<update_all>
+will run DBIC cascade triggers, while L</update> will not.
=cut
=back
Deletes the contents of the resultset from its result source. Note that this
-will not run cascade triggers. See L</delete_all> if you need triggers to run.
+will not run DBIC cascade triggers. See L</delete_all> if you need triggers
+to run.
=cut
my ($self) = @_;
my $del = {};
- if (!ref($self->{cond})) {
-
- # No-op. No condition, we're deleting everything
-
- } elsif (ref $self->{cond} eq 'ARRAY') {
-
- $del = [ map { my %hash;
- foreach my $key (keys %{$_}) {
- $key =~ /([^.]+)$/;
- $hash{$1} = $_->{$key};
- }; \%hash; } @{$self->{cond}} ];
-
- } elsif (ref $self->{cond} eq 'HASH') {
-
- if ((keys %{$self->{cond}})[0] eq '-and') {
-
- $del->{-and} = [ map { my %hash;
- foreach my $key (keys %{$_}) {
- $key =~ /([^.]+)$/;
- $hash{$1} = $_->{$key};
- }; \%hash; } @{$self->{cond}{-and}} ];
-
- } else {
-
- foreach my $key (keys %{$self->{cond}}) {
- $key =~ /([^.]+)$/;
- $del->{$1} = $self->{cond}{$key};
- }
- }
-
- } else {
- $self->throw_exception(
- "Can't delete on resultset with condition unless hash or array"
- );
- }
+ my $cond = $self->_cond_for_update_delete;
- $self->result_source->storage->delete($self->result_source->from, $del);
+ $self->result_source->storage->delete($self->result_source->from, $cond);
return 1;
}
=back
-Fetches all objects and deletes them one at a time. Note that C<delete_all>
-will run cascade triggers while L</delete> will not.
+Fetches all objects and deletes them one at a time. Note that C<delete_all>
+will run DBIC cascade triggers, while L</delete> will not.
=cut
Returns a resultset for the $page_number page of the resultset on which page
is called, where each page contains a number of rows equal to the 'rows'
-attribute set on the resultset, or 10 by default
+attribute set on the resultset (10 by default).
=cut
$class->update_or_create({ col => $val, ... });
-First, search for an existing row matching one of the unique constraints
-(including the primary key) on the source of this resultset. If a row is
-found, update it with the other given column values. Otherwise, create a new
+First, searches for an existing row matching one of the unique constraints
+(including the primary key) on the source of this resultset. If a row is
+found, updates it with the other given column values. Otherwise, creates a new
row.
Takes an optional C<key> attribute to search on a specific unique constraint.
If no C<key> is specified, it searches on all unique constraints defined on the
source, including the primary key.
-If the C<key> is specified as C<primary>, search only on the primary key.
+If the C<key> is specified as C<primary>, it searches only on the primary key.
See also L</find> and L</find_or_create>.
if (@unique_hashes) {
my $row = $self->single(\@unique_hashes);
if (defined $row) {
- $row->set_columns($hash);
- $row->update;
+ $row->update($hash);
return $row;
}
}
=back
-Gets the contents of the cache for the resultset if the cache is set
+Gets the contents of the cache for the resultset, if the cache is set.
=cut
sub get_cache {
- shift->{all_cache} || [];
+ shift->{all_cache};
}
=head2 set_cache
sub set_cache {
my ( $self, $data ) = @_;
$self->throw_exception("set_cache requires an arrayref")
- if ref $data ne 'ARRAY';
- my $result_class = $self->result_class;
- foreach( @$data ) {
- $self->throw_exception(
- "cannot cache object of type '$_', expected '$result_class'"
- ) if ref $_ ne $result_class;
- }
+ if defined($data) && (ref $data ne 'ARRAY');
$self->{all_cache} = $data;
}
=cut
sub clear_cache {
- shift->set_cache([]);
+ shift->set_cache(undef);
}
=head2 related_resultset
=item Value: ($order_by | \@order_by)
+=back
+
Which column(s) to order the results by. This is currently passed
through directly to SQL, so you can give e.g. C<year DESC> for a
descending order on the column `year'.
=back
-Contains one or more relationships that should be fetched along with the main
+Contains one or more relationships that should be fetched along with the main
query (when they are accessed afterwards they will have already been
"prefetched"). This is useful for when you know you will need the related
objects, because it saves at least one query:
In simple terms, C<from> works as follows:
[
- { <alias> => <table>, -join-type => 'inner|left|right' }
+ { <alias> => <table>, -join_type => 'inner|left|right' }
[] # nested JOIN (optional)
{ <table.column> => <foreign_table.foreign_key> }
]
from => [
{ child => 'person' },
[
- { father => 'person', -join-type => 'inner' },
+ { father => 'person', -join_type => 'inner' },
{ 'father.id' => 'child.father_id' }
],
]
group_by => [qw/ column1 column2 ... /]
+=head2 having
+
+=over 4
+
+=item Value: $condition
+
+=back
+
+HAVING is a select statement attribute that is applied between GROUP BY and
+ORDER BY. It is applied to the after the grouping calculations have been
+done.
+
+ having => { 'count(employee)' => { '>=', 100 } }
+
=head2 distinct
=over 4
... do stuff ...
}
- $rs->first; # without cache, this would issue a query
+ $rs->first; # without cache, this would issue a query
By default, searches are not cached.
projects / dbsrgits/DBIx-Class.git / blobdiff