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89c0a5a2 |
1 | package DBIx::Class::ResultSet; |
2 | |
3 | use strict; |
4 | use warnings; |
5 | use overload |
6 | '0+' => 'count', |
a910dc57 |
7 | 'bool' => sub { 1; }, |
89c0a5a2 |
8 | fallback => 1; |
3c5b25c5 |
9 | use Data::Page; |
ea20d0fd |
10 | use Storable; |
89c0a5a2 |
11 | |
ee38fa40 |
12 | =head1 NAME |
13 | |
bfab575a |
14 | DBIx::Class::ResultSet - Responsible for fetching and creating resultset. |
ee38fa40 |
15 | |
bfab575a |
16 | =head1 SYNOPSIS |
ee38fa40 |
17 | |
bfab575a |
18 | my $rs = MyApp::DB::Class->search(registered => 1); |
19 | my @rows = MyApp::DB::Class->search(foo => 'bar'); |
ee38fa40 |
20 | |
21 | =head1 DESCRIPTION |
22 | |
bfab575a |
23 | The resultset is also known as an iterator. It is responsible for handling |
24 | queries that may return an arbitrary number of rows, e.g. via C<search> |
25 | or a C<has_many> relationship. |
ee38fa40 |
26 | |
27 | =head1 METHODS |
28 | |
976f3686 |
29 | =head2 new($source, \%$attrs) |
ee38fa40 |
30 | |
976f3686 |
31 | The resultset constructor. Takes a source object (usually a DBIx::Class::Table) |
32 | and an attribute hash (see below for more information on attributes). Does |
33 | not perform any queries -- these are executed as needed by the other methods. |
ee38fa40 |
34 | |
35 | =cut |
36 | |
89c0a5a2 |
37 | sub new { |
fea3d045 |
38 | my $class = shift; |
f9db5527 |
39 | return $class->new_result(@_) if ref $class; |
fea3d045 |
40 | my ($source, $attrs) = @_; |
b98e75f6 |
41 | #use Data::Dumper; warn Dumper($attrs); |
ea20d0fd |
42 | $attrs = Storable::dclone($attrs || {}); # { %{ $attrs || {} } }; |
c7ce65e6 |
43 | my %seen; |
6aeb9185 |
44 | my $alias = ($attrs->{alias} ||= 'me'); |
976f3686 |
45 | if (!$attrs->{select}) { |
46 | my @cols = ($attrs->{cols} |
47 | ? @{delete $attrs->{cols}} |
48 | : $source->result_class->_select_columns); |
6aeb9185 |
49 | $attrs->{select} = [ map { m/\./ ? $_ : "${alias}.$_" } @cols ]; |
976f3686 |
50 | } |
6aeb9185 |
51 | $attrs->{as} ||= [ map { m/^$alias\.(.*)$/ ? $1 : $_ } @{$attrs->{select}} ]; |
976f3686 |
52 | #use Data::Dumper; warn Dumper(@{$attrs}{qw/select as/}); |
fea3d045 |
53 | $attrs->{from} ||= [ { $alias => $source->from } ]; |
b52e9bf8 |
54 | if (my $join = delete $attrs->{join}) { |
55 | foreach my $j (ref $join eq 'ARRAY' |
56 | ? (@{$join}) : ($join)) { |
c7ce65e6 |
57 | if (ref $j eq 'HASH') { |
58 | $seen{$_} = 1 foreach keys %$j; |
59 | } else { |
60 | $seen{$j} = 1; |
61 | } |
62 | } |
8452e496 |
63 | push(@{$attrs->{from}}, $source->resolve_join($join, $attrs->{alias})); |
c7ce65e6 |
64 | } |
54540863 |
65 | $attrs->{group_by} ||= $attrs->{select} if delete $attrs->{distinct}; |
b52e9bf8 |
66 | foreach my $pre (@{delete $attrs->{prefetch} || []}) { |
8452e496 |
67 | push(@{$attrs->{from}}, $source->resolve_join($pre, $attrs->{alias})) |
c7ce65e6 |
68 | unless $seen{$pre}; |
976f3686 |
69 | my @pre = |
c7ce65e6 |
70 | map { "$pre.$_" } |
f9db5527 |
71 | $source->related_source($pre)->columns; |
976f3686 |
72 | push(@{$attrs->{select}}, @pre); |
73 | push(@{$attrs->{as}}, @pre); |
fef5d100 |
74 | } |
6aeb9185 |
75 | if ($attrs->{page}) { |
76 | $attrs->{rows} ||= 10; |
77 | $attrs->{offset} ||= 0; |
78 | $attrs->{offset} += ($attrs->{rows} * ($attrs->{page} - 1)); |
79 | } |
89c0a5a2 |
80 | my $new = { |
cda04c3a |
81 | source => $source, |
89c0a5a2 |
82 | cond => $attrs->{where}, |
0a3c5b43 |
83 | from => $attrs->{from}, |
3c5b25c5 |
84 | count => undef, |
93b004d3 |
85 | page => delete $attrs->{page}, |
3c5b25c5 |
86 | pager => undef, |
89c0a5a2 |
87 | attrs => $attrs }; |
2f5911b2 |
88 | bless ($new, $class); |
9229f20a |
89 | return $new; |
89c0a5a2 |
90 | } |
91 | |
bfab575a |
92 | =head2 search |
0a3c5b43 |
93 | |
6009260a |
94 | my @obj = $rs->search({ foo => 3 }); # "... WHERE foo = 3" |
95 | my $new_rs = $rs->search({ foo => 3 }); |
96 | |
97 | If you need to pass in additional attributes but no additional condition, |
98 | call it as ->search(undef, \%attrs); |
99 | |
100 | my @all = $class->search({}, { cols => [qw/foo bar/] }); # "SELECT foo, bar FROM $class_table" |
0a3c5b43 |
101 | |
102 | =cut |
103 | |
104 | sub search { |
105 | my $self = shift; |
106 | |
6009260a |
107 | #use Data::Dumper;warn Dumper(@_); |
108 | |
0a3c5b43 |
109 | my $attrs = { %{$self->{attrs}} }; |
110 | if (@_ > 1 && ref $_[$#_] eq 'HASH') { |
6aeb9185 |
111 | $attrs = { %$attrs, %{ pop(@_) } }; |
0a3c5b43 |
112 | } |
113 | |
6aeb9185 |
114 | my $where = (@_ ? ((@_ == 1 || ref $_[0] eq "HASH") ? shift : {@_}) : undef()); |
0a3c5b43 |
115 | if (defined $where) { |
116 | $where = (defined $attrs->{where} |
ad3d2d7c |
117 | ? { '-and' => |
118 | [ map { ref $_ eq 'ARRAY' ? [ -or => $_ ] : $_ } |
119 | $where, $attrs->{where} ] } |
0a3c5b43 |
120 | : $where); |
121 | $attrs->{where} = $where; |
122 | } |
123 | |
fea3d045 |
124 | my $rs = (ref $self)->new($self->{source}, $attrs); |
0a3c5b43 |
125 | |
126 | return (wantarray ? $rs->all : $rs); |
127 | } |
128 | |
bfab575a |
129 | =head2 search_literal |
6009260a |
130 | my @obj = $rs->search_literal($literal_where_cond, @bind); |
131 | my $new_rs = $rs->search_literal($literal_where_cond, @bind); |
132 | |
133 | Pass a literal chunk of SQL to be added to the conditional part of the |
134 | resultset |
135 | |
bfab575a |
136 | =cut |
137 | |
6009260a |
138 | sub search_literal { |
139 | my ($self, $cond, @vals) = @_; |
140 | my $attrs = (ref $vals[$#vals] eq 'HASH' ? { %{ pop(@vals) } } : {}); |
141 | $attrs->{bind} = [ @{$self->{attrs}{bind}||[]}, @vals ]; |
142 | return $self->search(\$cond, $attrs); |
143 | } |
0a3c5b43 |
144 | |
716b3d29 |
145 | =head2 find(@colvalues), find(\%cols) |
146 | |
147 | Finds a row based on its primary key(s). |
148 | |
149 | =cut |
150 | |
151 | sub find { |
152 | my ($self, @vals) = @_; |
153 | my $attrs = (@vals > 1 && ref $vals[$#vals] eq 'HASH' ? pop(@vals) : {}); |
154 | my @pk = $self->{source}->primary_columns; |
155 | #use Data::Dumper; warn Dumper($attrs, @vals, @pk); |
156 | $self->{source}->result_class->throw( "Can't find unless primary columns are defined" ) |
157 | unless @pk; |
158 | my $query; |
159 | if (ref $vals[0] eq 'HASH') { |
160 | $query = $vals[0]; |
161 | } elsif (@pk == @vals) { |
162 | $query = {}; |
163 | @{$query}{@pk} = @vals; |
164 | } else { |
165 | $query = {@vals}; |
166 | } |
167 | #warn Dumper($query); |
168 | # Useless -> disabled |
169 | #$self->{source}->result_class->throw( "Can't find unless all primary keys are specified" ) |
170 | # unless (keys %$query >= @pk); # If we check 'em we run afoul of uc/lc |
171 | # column names etc. Not sure what to do yet |
172 | return $self->search($query)->next; |
173 | } |
174 | |
b52e9bf8 |
175 | =head2 search_related |
176 | |
177 | $rs->search_related('relname', $cond?, $attrs?); |
178 | |
179 | =cut |
180 | |
6aeb9185 |
181 | sub search_related { |
182 | my ($self, $rel, @rest) = @_; |
f9db5527 |
183 | my $rel_obj = $self->{source}->relationship_info($rel); |
6aeb9185 |
184 | $self->{source}->result_class->throw( |
185 | "No such relationship ${rel} in search_related") |
186 | unless $rel_obj; |
6aeb9185 |
187 | my $rs = $self->search(undef, { join => $rel }); |
ea20d0fd |
188 | return $self->{source}->schema->resultset($rel_obj->{class} |
189 | )->search( undef, |
190 | { %{$rs->{attrs}}, |
191 | alias => $rel, |
192 | select => undef(), |
193 | as => undef() } |
6aeb9185 |
194 | )->search(@rest); |
195 | } |
b52e9bf8 |
196 | |
bfab575a |
197 | =head2 cursor |
ee38fa40 |
198 | |
bfab575a |
199 | Returns a storage-driven cursor to the given resultset. |
ee38fa40 |
200 | |
201 | =cut |
202 | |
73f58123 |
203 | sub cursor { |
204 | my ($self) = @_; |
2f5911b2 |
205 | my ($source, $attrs) = @{$self}{qw/source attrs/}; |
6aeb9185 |
206 | $attrs = { %$attrs }; |
73f58123 |
207 | return $self->{cursor} |
976f3686 |
208 | ||= $source->storage->select($self->{from}, $attrs->{select}, |
73f58123 |
209 | $attrs->{where},$attrs); |
210 | } |
211 | |
bfab575a |
212 | =head2 search_like |
58a4bd18 |
213 | |
214 | Identical to search except defaults to 'LIKE' instead of '=' in condition |
215 | |
216 | =cut |
217 | |
218 | sub search_like { |
219 | my $class = shift; |
220 | my $attrs = { }; |
221 | if (@_ > 1 && ref $_[$#_] eq 'HASH') { |
222 | $attrs = pop(@_); |
223 | } |
224 | my $query = ref $_[0] eq "HASH" ? { %{shift()} }: {@_}; |
225 | $query->{$_} = { 'like' => $query->{$_} } for keys %$query; |
226 | return $class->search($query, { %$attrs }); |
227 | } |
228 | |
bfab575a |
229 | =head2 slice($first, $last) |
ee38fa40 |
230 | |
bfab575a |
231 | Returns a subset of elements from the resultset. |
ee38fa40 |
232 | |
233 | =cut |
234 | |
89c0a5a2 |
235 | sub slice { |
236 | my ($self, $min, $max) = @_; |
237 | my $attrs = { %{ $self->{attrs} || {} } }; |
6aeb9185 |
238 | $attrs->{offset} ||= 0; |
239 | $attrs->{offset} += $min; |
89c0a5a2 |
240 | $attrs->{rows} = ($max ? ($max - $min + 1) : 1); |
fea3d045 |
241 | my $slice = (ref $self)->new($self->{source}, $attrs); |
89c0a5a2 |
242 | return (wantarray ? $slice->all : $slice); |
243 | } |
244 | |
bfab575a |
245 | =head2 next |
ee38fa40 |
246 | |
bfab575a |
247 | Returns the next element in the resultset (undef is there is none). |
ee38fa40 |
248 | |
249 | =cut |
250 | |
89c0a5a2 |
251 | sub next { |
252 | my ($self) = @_; |
73f58123 |
253 | my @row = $self->cursor->next; |
89c0a5a2 |
254 | return unless (@row); |
c7ce65e6 |
255 | return $self->_construct_object(@row); |
256 | } |
257 | |
258 | sub _construct_object { |
259 | my ($self, @row) = @_; |
976f3686 |
260 | my @cols = @{ $self->{attrs}{as} }; |
261 | #warn "@cols -> @row"; |
b52e9bf8 |
262 | my (%me, %pre); |
263 | foreach my $col (@cols) { |
264 | if ($col =~ /([^\.]+)\.([^\.]+)/) { |
6aeb9185 |
265 | $pre{$1}[0]{$2} = shift @row; |
b52e9bf8 |
266 | } else { |
267 | $me{$col} = shift @row; |
c7ce65e6 |
268 | } |
c7ce65e6 |
269 | } |
c01ab172 |
270 | my $new = $self->{source}->result_class->inflate_result( |
271 | $self->{source}, \%me, \%pre); |
33ce49d6 |
272 | $new = $self->{attrs}{record_filter}->($new) |
273 | if exists $self->{attrs}{record_filter}; |
274 | return $new; |
89c0a5a2 |
275 | } |
276 | |
bfab575a |
277 | =head2 count |
ee38fa40 |
278 | |
bfab575a |
279 | Performs an SQL C<COUNT> with the same query as the resultset was built |
6009260a |
280 | with to find the number of elements. If passed arguments, does a search |
281 | on the resultset and counts the results of that. |
ee38fa40 |
282 | |
283 | =cut |
284 | |
89c0a5a2 |
285 | sub count { |
6009260a |
286 | my $self = shift; |
287 | return $self->search(@_)->count if @_ && defined $_[0]; |
54540863 |
288 | die "Unable to ->count with a GROUP BY" if defined $self->{attrs}{group_by}; |
6aeb9185 |
289 | unless (defined $self->{count}) { |
976f3686 |
290 | my $attrs = { %{ $self->{attrs} }, |
54540863 |
291 | select => { 'count' => '*' }, |
292 | as => [ 'count' ] }; |
ea20d0fd |
293 | # offset, order by and page are not needed to count. record_filter is cdbi |
294 | delete $attrs->{$_} for qw/rows offset order_by page pager record_filter/; |
3c5b25c5 |
295 | |
fea3d045 |
296 | ($self->{count}) = (ref $self)->new($self->{source}, $attrs)->cursor->next; |
3c5b25c5 |
297 | } |
298 | return 0 unless $self->{count}; |
6aeb9185 |
299 | my $count = $self->{count}; |
300 | $count -= $self->{attrs}{offset} if $self->{attrs}{offset}; |
301 | $count = $self->{attrs}{rows} if |
302 | ($self->{attrs}{rows} && $self->{attrs}{rows} < $count); |
303 | return $count; |
89c0a5a2 |
304 | } |
305 | |
bfab575a |
306 | =head2 count_literal |
6009260a |
307 | |
bfab575a |
308 | Calls search_literal with the passed arguments, then count. |
6009260a |
309 | |
310 | =cut |
311 | |
312 | sub count_literal { shift->search_literal(@_)->count; } |
313 | |
bfab575a |
314 | =head2 all |
ee38fa40 |
315 | |
bfab575a |
316 | Returns all elements in the resultset. Called implictly if the resultset |
317 | is returned in list context. |
ee38fa40 |
318 | |
319 | =cut |
320 | |
89c0a5a2 |
321 | sub all { |
322 | my ($self) = @_; |
c7ce65e6 |
323 | return map { $self->_construct_object(@$_); } |
73f58123 |
324 | $self->cursor->all; |
89c0a5a2 |
325 | } |
326 | |
bfab575a |
327 | =head2 reset |
ee38fa40 |
328 | |
bfab575a |
329 | Resets the resultset's cursor, so you can iterate through the elements again. |
ee38fa40 |
330 | |
331 | =cut |
332 | |
89c0a5a2 |
333 | sub reset { |
334 | my ($self) = @_; |
73f58123 |
335 | $self->cursor->reset; |
89c0a5a2 |
336 | return $self; |
337 | } |
338 | |
bfab575a |
339 | =head2 first |
ee38fa40 |
340 | |
bfab575a |
341 | Resets the resultset and returns the first element. |
ee38fa40 |
342 | |
343 | =cut |
344 | |
89c0a5a2 |
345 | sub first { |
346 | return $_[0]->reset->next; |
347 | } |
348 | |
c01ab172 |
349 | =head2 update(\%values) |
350 | |
351 | Sets the specified columns in the resultset to the supplied values |
352 | |
353 | =cut |
354 | |
355 | sub update { |
356 | my ($self, $values) = @_; |
357 | die "Values for update must be a hash" unless ref $values eq 'HASH'; |
358 | return $self->{source}->storage->update( |
359 | $self->{source}->from, $values, $self->{cond}); |
360 | } |
361 | |
362 | =head2 update_all(\%values) |
363 | |
364 | Fetches all objects and updates them one at a time. ->update_all will run |
365 | cascade triggers, ->update will not. |
366 | |
367 | =cut |
368 | |
369 | sub update_all { |
370 | my ($self, $values) = @_; |
371 | die "Values for update must be a hash" unless ref $values eq 'HASH'; |
372 | foreach my $obj ($self->all) { |
373 | $obj->set_columns($values)->update; |
374 | } |
375 | return 1; |
376 | } |
377 | |
bfab575a |
378 | =head2 delete |
ee38fa40 |
379 | |
c01ab172 |
380 | Deletes the contents of the resultset from its result source. |
ee38fa40 |
381 | |
382 | =cut |
383 | |
28927b50 |
384 | sub delete { |
89c0a5a2 |
385 | my ($self) = @_; |
c01ab172 |
386 | $self->{source}->storage->delete($self->{source}->from, $self->{cond}); |
89c0a5a2 |
387 | return 1; |
388 | } |
389 | |
c01ab172 |
390 | =head2 delete_all |
391 | |
392 | Fetches all objects and deletes them one at a time. ->delete_all will run |
393 | cascade triggers, ->delete will not. |
394 | |
395 | =cut |
396 | |
397 | sub delete_all { |
398 | my ($self) = @_; |
399 | $_->delete for $self->all; |
400 | return 1; |
401 | } |
28927b50 |
402 | |
bfab575a |
403 | =head2 pager |
ee38fa40 |
404 | |
405 | Returns a L<Data::Page> object for the current resultset. Only makes |
406 | sense for queries with page turned on. |
407 | |
408 | =cut |
409 | |
3c5b25c5 |
410 | sub pager { |
411 | my ($self) = @_; |
412 | my $attrs = $self->{attrs}; |
93b004d3 |
413 | die "Can't create pager for non-paged rs" unless $self->{page}; |
6aeb9185 |
414 | $attrs->{rows} ||= 10; |
415 | $self->count; |
416 | return $self->{pager} ||= Data::Page->new( |
93b004d3 |
417 | $self->{count}, $attrs->{rows}, $self->{page}); |
3c5b25c5 |
418 | } |
419 | |
bfab575a |
420 | =head2 page($page_num) |
ee38fa40 |
421 | |
bfab575a |
422 | Returns a new resultset for the specified page. |
ee38fa40 |
423 | |
424 | =cut |
425 | |
3c5b25c5 |
426 | sub page { |
427 | my ($self, $page) = @_; |
6aeb9185 |
428 | my $attrs = { %{$self->{attrs}} }; |
3c5b25c5 |
429 | $attrs->{page} = $page; |
fea3d045 |
430 | return (ref $self)->new($self->{source}, $attrs); |
431 | } |
432 | |
433 | =head2 new_result(\%vals) |
434 | |
435 | Creates a result in the resultset's result class |
436 | |
437 | =cut |
438 | |
439 | sub new_result { |
440 | my ($self, $values) = @_; |
441 | $self->{source}->result_class->throw( "new_result needs a hash" ) |
442 | unless (ref $values eq 'HASH'); |
443 | $self->{source}->result_class->throw( "Can't abstract implicit construct, condition not a hash" ) |
444 | if ($self->{cond} && !(ref $self->{cond} eq 'HASH')); |
445 | my %new = %$values; |
446 | my $alias = $self->{attrs}{alias}; |
447 | foreach my $key (keys %{$self->{cond}||{}}) { |
448 | $new{$1} = $self->{cond}{$key} if ($key =~ m/^(?:$alias\.)?([^\.]+)$/); |
449 | } |
097d3227 |
450 | my $obj = $self->{source}->result_class->new(\%new); |
451 | $obj->result_source($self->{source}) if $obj->can('result_source'); |
452 | $obj; |
fea3d045 |
453 | } |
454 | |
455 | =head2 create(\%vals) |
456 | |
457 | Inserts a record into the resultset and returns the object |
458 | |
459 | Effectively a shortcut for ->new_result(\%vals)->insert |
460 | |
461 | =cut |
462 | |
463 | sub create { |
464 | my ($self, $attrs) = @_; |
465 | $self->{source}->result_class->throw( "create needs a hashref" ) unless ref $attrs eq 'HASH'; |
466 | return $self->new_result($attrs)->insert; |
3c5b25c5 |
467 | } |
468 | |
c2b15ecc |
469 | =head2 find_or_create(\%vals) |
470 | |
471 | $class->find_or_create({ key => $val, ... }); |
472 | |
473 | Searches for a record matching the search condition; if it doesn't find one, |
474 | creates one and returns that instead. |
475 | |
476 | =cut |
477 | |
478 | sub find_or_create { |
479 | my $self = shift; |
480 | my $hash = ref $_[0] eq "HASH" ? shift: {@_}; |
481 | my $exists = $self->find($hash); |
482 | return defined($exists) ? $exists : $self->create($hash); |
483 | } |
484 | |
40dbc108 |
485 | =head1 ATTRIBUTES |
076652e8 |
486 | |
bfab575a |
487 | The resultset takes various attributes that modify its behavior. |
488 | Here's an overview of them: |
489 | |
490 | =head2 order_by |
076652e8 |
491 | |
bfab575a |
492 | Which column(s) to order the results by. This is currently passed |
493 | through directly to SQL, so you can give e.g. C<foo DESC> for a |
494 | descending order. |
076652e8 |
495 | |
976f3686 |
496 | =head2 cols (arrayref) |
497 | |
498 | Shortcut to request a particular set of columns to be retrieved - adds |
499 | 'me.' onto the start of any column without a '.' in it and sets 'select' |
500 | from that, then auto-populates 'as' from 'select' as normal |
501 | |
502 | =head2 select (arrayref) |
503 | |
504 | Indicates which columns should be selected from the storage |
505 | |
506 | =head2 as (arrayref) |
076652e8 |
507 | |
976f3686 |
508 | Indicates column names for object inflation |
ee38fa40 |
509 | |
bfab575a |
510 | =head2 join |
ee38fa40 |
511 | |
bfab575a |
512 | Contains a list of relationships that should be joined for this query. Can also |
513 | contain a hash reference to refer to that relation's relations. So, if one column |
514 | in your class C<belongs_to> foo and another C<belongs_to> bar, you can do |
515 | C<< join => [qw/ foo bar /] >> to join both (and e.g. use them for C<order_by>). |
516 | If a foo contains many margles and you want to join those too, you can do |
517 | C<< join => { foo => 'margle' } >>. If you want to fetch the columns from the |
518 | related table as well, see C<prefetch> below. |
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519 | |
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520 | =head2 prefetch |
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521 | |
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522 | Contains a list of relationships that should be fetched along with the main |
523 | query (when they are accessed afterwards they will have already been |
524 | "prefetched"). This is useful for when you know you will need the related |
525 | object(s), because it saves a query. Currently limited to prefetching |
526 | one relationship deep, so unlike C<join>, prefetch must be an arrayref. |
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527 | |
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528 | =head2 from |
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529 | |
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530 | This attribute can contain a arrayref of elements. Each element can be another |
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531 | arrayref, to nest joins, or it can be a hash which represents the two sides |
532 | of the join. |
533 | |
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534 | NOTE: Use this on your own risk. This allows you to shoot your foot off! |
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535 | |
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536 | =head2 page |
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537 | |
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538 | For a paged resultset, specifies which page to retrieve. Leave unset |
539 | for an unpaged resultset. |
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540 | |
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541 | =head2 rows |
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542 | |
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543 | For a paged resultset, how many rows per page |
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544 | |
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545 | =head2 group_by (listref) |
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546 | |
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547 | A listref of columns to group by (note that 'count' doesn't work on grouped |
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548 | resultsets) |
549 | |
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550 | group_by => [qw/ column1 column2 ... /] |
551 | |
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552 | =head2 distinct |
553 | |
554 | Set to 1 to group by all columns |
555 | |
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556 | =cut |
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557 | |
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558 | 1; |