1 package SQL::Abstract::ExtraClauses;
6 is => 'ro', init_arg => undef,
8 expand_expr expand_maybe_list_expr render_aqt join_query_parts
13 my ($self, $method, @args) = @_;
15 local $self->{sqla} = shift;
16 $self->$method(@args, @_)
21 my ($self, $method, @pairs) = @_;
22 my $sqla = $self->sqla;
23 while (my ($car, $cdr) = splice(@pairs, 0, 2)) {
24 my $cb = $self->cb($cdr);
25 $sqla->$method($car, $cb);
31 my ($self, $sqla) = @_;
32 $self = $self->new unless ref($self);
33 local $self->{sqla} = $sqla;
34 $self->register_extensions($sqla);
37 sub register_extensions {
38 my ($self, $sqla) = @_;
39 my @clauses = $sqla->clauses_of('select');
41 CLAUSE: foreach my $idx (0..$#clauses) {
42 if ($clauses[$idx] eq 'order_by') {
43 @before_setop = @clauses[0..$idx-1];
44 splice(@clauses, $idx, 0, qw(setop group_by having));
48 die "Huh?" unless @before_setop;
49 $sqla->clauses_of(select => 'with', @clauses);
53 => sub { $_[0]->expand_maybe_list_expr($_[2], -ident) },
55 => sub { $_[0]->expand_expr($_[2]) },
58 expander => (join => '_expand_join', from_list => '_expand_from_list')
61 renderer => (join => '_render_join', from_list => '_render_from_list')
63 $sqla->binop_expander(as => $self->cb('_expand_op_as'));
64 $sqla->renderer(as => $self->cb('_render_as'));
65 $sqla->expander(alias => $self->cb('_expand_alias'));
66 $sqla->renderer(alias => $self->cb('_render_alias'));
68 $sqla->clauses_of(update => sub {
69 my ($self, @clauses) = @_;
70 splice(@clauses, 2, 0, 'from');
74 $sqla->clauses_of(delete => sub {
75 my ($self, @clauses) = @_;
76 splice(@clauses, 1, 0, 'using');
80 $sqla->clause_expanders(
81 'update.from' => $self->cb('_expand_from_list'),
82 'delete.using' => $self->cb('_expand_from_list'),
83 'insert.rowvalues' => $self->cb(sub {
84 +(from => $_[0]->expand_expr({ -values => $_[2] }));
86 'insert.select' => $self->cb(sub {
87 +(from => $_[0]->expand_expr({ -select => $_[2] }));
92 $sqla->wrap_expander(select => sub {
93 $self->cb('_expand_select', $_[0], \@before_setop);
96 $sqla->clause_renderer(
97 'select.setop' => $self->cb(sub { $_[0]->render_aqt($_[2]); })
100 foreach my $setop (qw(union intersect except)) {
101 $sqla->expander($setop => $self->cb('_expand_setop'));
102 $sqla->renderer($setop => $self->cb('_render_setop'));
105 my $setop_expander = $self->cb('_expand_clause_setop');
107 $sqla->clause_expanders(
108 map +($_ => $setop_expander),
110 map +($_, "${_}_all", "${_}_distinct"),
111 qw(union intersect except)
114 my $w_exp = $self->cb('_expand_with');
115 my $w_rdr = $self->cb('_render_with');
116 $sqla->clause_expander('select.with' => $w_exp);
117 $sqla->clause_expander('select.with_recursive' => $w_exp);
118 $sqla->clause_renderer('select.with' => $w_rdr);
120 foreach my $stmt (qw(insert update delete)) {
121 $sqla->clauses_of($stmt => 'with', $sqla->clauses_of($stmt));
122 $sqla->clause_expander("${stmt}.$_" => $w_exp)
123 for qw(with with_recursive);
124 $sqla->clause_renderer("${stmt}.with" => $w_rdr);
127 $sqla->expander(cast => $self->cb('_expand_cast'));
129 $sqla->clause_expanders(
130 "select.from", $self->cb('_expand_from_list'),
131 "update.target", $self->cb('_expand_update_clause_target'),
132 "update.update", $self->cb('_expand_update_clause_target'),
139 my ($self, $orig, $before_setop, @args) = @_;
140 my $exp = $self->sqla->$orig(@args);
141 return $exp unless my $setop = (my $sel = $exp->{-select})->{setop};
142 if (my @keys = grep $sel->{$_}, @$before_setop) {
143 my %inner; @inner{@keys} = delete @{$sel}{@keys};
144 unshift @{(values(%$setop))[0]{queries}},
145 { -select => \%inner };
150 sub _expand_from_list {
151 my ($self, undef, $args) = @_;
152 if (ref($args) eq 'HASH') {
153 return $args if $args->{-from_list};
154 return { -from_list => [ $self->expand_expr($args) ] };
157 my @args = ref($args) eq 'ARRAY' ? @$args : ($args);
158 while (my $entry = shift @args) {
159 if (!ref($entry) and $entry =~ /^-(.*)/) {
161 $list[-1] = $self->expand_expr({ -as => [
162 $list[-1], map +(ref($_) eq 'ARRAY' ? @$_ : $_), shift(@args)
166 $entry = { $entry => shift @args };
168 my $aqt = $self->expand_expr($entry, -ident);
169 if ($aqt->{-join} and not $aqt->{-join}{from}) {
170 $aqt->{-join}{from} = pop @list;
174 return { -from_list => \@list };
178 my ($self, undef, $args) = @_;
182 : (to => $args->[0], @{$args}[1..$#$args])
184 if (my $as = delete $proto{as}) {
185 $proto{to} = $self->expand_expr({ -as => [ $proto{to}, $as ] });
187 if (defined($proto{using}) and ref(my $using = $proto{using}) ne 'HASH') {
189 map [ $self->expand_expr($_, -ident) ],
190 ref($using) eq 'ARRAY' ? @$using: $using
193 my %ret = map +($_ => $self->expand_expr($proto{$_}, -ident)),
195 return +{ -join => \%ret };
198 sub _render_from_list {
199 my ($self, undef, $list) = @_;
200 return $self->join_query_parts(', ', @$list);
204 my ($self, undef, $args) = @_;
208 { -keyword => join '_', ($args->{type}||()), 'join' },
209 (map +($_->{-ident} || $_->{-as} ? $_ : ('(', $_, ')')), $args->{to}),
211 { -keyword => 'on' },
215 { -keyword => 'using' },
216 '(', $args->{using}, ')',
219 return $self->join_query_parts(' ', @parts);
223 my ($self, undef, $vv, $k) = @_;
224 my @vv = (ref($vv) eq 'ARRAY' ? @$vv : $vv);
225 my $ik = $self->expand_expr($k, -ident);
226 return +{ -as => [ $ik, $self->expand_expr($vv[0], -alias) ] }
227 if @vv == 1 and ref($vv[0]) eq 'HASH';
229 my @as = map $self->expand_expr($_, -ident), @vv;
230 return { -as => [ $ik, { -alias => \@as } ] };
234 my ($self, undef, $args) = @_;
235 my ($thing, $alias) = @$args;
236 return $self->join_query_parts(
239 { -keyword => 'as' },
245 my ($self, undef, $args) = @_;
246 my ($as, @cols) = @$args;
248 ? $self->join_query_parts('',
251 $self->join_query_parts(
257 : $self->render_aqt($as)
261 sub _expand_update_clause_target {
262 my ($self, undef, $target) = @_;
263 +(target => $self->_expand_from_list(undef, $target));
267 my ($self, undef, $thing) = @_;
268 return { -func => [ cast => $thing ] } if ref($thing) eq 'HASH';
269 my ($cast, $to) = @{$thing};
270 +{ -func => [ cast => { -as => [
271 $self->expand_expr($cast),
272 $self->expand_expr($to, -ident),
277 my ($self, undef, $args) = @_;
278 if (ref($args) eq 'HASH' and my $alias = $args->{-alias}) {
282 map $self->expand_expr($_, -ident),
283 ref($args) eq 'ARRAY' ? @{$args} : $args
289 my ($self, $name, $with) = @_;
290 my (undef, $type) = split '_', $name;
291 if (ref($with) eq 'HASH') {
296 $self->expand_expr({ -alias => $_->[0] }, -ident),
297 $self->expand_expr($_->[1]),
298 ], @{$with->{queries}}
304 while (my ($alias, $query) = splice @with, 0, 2) {
306 $self->expand_expr({ -alias => $alias }, -ident),
307 $self->expand_expr($query)
310 return +(with => { ($type ? (type => $type) : ()), queries => \@exp });
314 my ($self, undef, $with) = @_;
315 my $q_part = $self->join_query_parts(', ',
317 my ($alias, $query) = @$_;
318 $self->join_query_parts(' ',
320 { -keyword => 'as' },
323 } @{$with->{queries}}
325 return $self->join_query_parts(' ',
326 { -keyword => join '_', 'with', ($with->{type}||'') },
332 my ($self, $setop, $args) = @_;
335 queries => [ map $self->expand_expr($_), @{$args->{queries}} ],
340 my ($self, $setop, $args) = @_;
341 $self->join_query_parts(
342 { -keyword => ' '.join('_', $setop, ($args->{type}||())).' ' },
347 sub _expand_clause_setop {
348 my ($self, $setop, $args) = @_;
349 my ($op, $type) = split '_', $setop;
350 +(setop => $self->expand_expr({
352 ($type ? (type => $type) : ()),
353 queries => (ref($args) eq 'ARRAY' ? $args : [ $args ])
364 SQL::Abstract::ExtraClauses - new/experimental additions to L<SQL::Abstract>
368 my $sqla = SQL::Abstract->new;
369 SQL::Abstract::ExtraClauses->apply_to($sqla);
375 Applies the plugin to an L<SQL::Abstract> object.
379 For plugin authors, creates a callback to call a method on the plugin.
383 Available only during plugin callback executions, contains the currently
384 active L<SQL::Abstract> object.
390 Represents a table alias. Expands name and column names with ident as default.
393 { -alias => [ 't', 'x', 'y', 'z' ] }
397 { -ident => [ 't' ] }, { -ident => [ 'x' ] },
398 { -ident => [ 'y' ] }, { -ident => [ 'z' ] },
407 Represents an sql AS. LHS is expanded with ident as default, RHS is treated
408 as a list of arguments for the alias node.
411 { foo => { -as => 'bar' } }
416 { -ident => [ 'foo' ] },
417 { -alias => [ { -ident => [ 'bar' ] } ] },
426 { -as => [ { -select => { _ => 'blah' } }, 't', 'blah' ] }
431 { select => { -op => [ ',', { -ident => [ 'blah' ] } ] } }
433 { -alias => [ { -ident => [ 't' ] }, { -ident => [ 'blah' ] } ] },
437 (SELECT blah) AS t(blah)
443 { -cast => [ { -ident => 'birthday' }, 'date' ] }
448 -as => [ { -ident => [ 'birthday' ] }, { -ident => [ 'date' ] } ]
453 CAST(birthday AS date)