clause_renderer => [
'select.setop' => sub { $_[0]->render_aqt($_[2]) }
],
- expander => [ map +($_ => '_expand_setop'), qw(union intersect except) ],
+ expander => [
+ map +($_ => '_expand_setop', "${_}_all" => '_expand_setop'), qw(union intersect except) ],
renderer => [ map +($_ => '_render_setop'), qw(union intersect except) ],
);
sub _expand_setop {
my ($self, $setop, $args) = @_;
+ my $is_all = $setop =~ s/_all$//;
+{ "-${setop}" => {
- %$args,
- queries => [ map $self->expand_expr($_), @{$args->{queries}} ],
+ ($is_all ? (type => 'all') : ()),
+ (ref($args) eq 'ARRAY'
+ ? (queries => [ map $self->expand_expr($_), @$args ])
+ : (
+ %$args,
+ queries => [ map $self->expand_expr($_), @{$args->{queries}} ]
+ )
+ ),
} };
}
my $sqla = SQL::Abstract->new;
SQL::Abstract::ExtraClauses->apply_to($sqla);
+=head1 WARNING
+
+This module is basically a nursery for things that seem like a good idea
+to live in until we figure out if we were right about that.
+
=head1 METHODS
=head2 apply_to
x LEFT JOIN ( y LEFT JOIN z )
[]
+=head2 setops
+
+Expanders are provided for union, union_all, intersect, intersect_all,
+except and except_all, and each takes an arrayref of queries:
+
+ # expr
+ { -union => [
+ { -select => { _ => { -value => 1 } } },
+ { -select => { _ => { -value => 2 } } },
+ ] }
+
+ # aqt
+ { -union => { queries => [
+ { -select =>
+ { select => { -op => [ ',', { -bind => [ undef, 1 ] } ] } }
+ },
+ { -select =>
+ { select => { -op => [ ',', { -bind => [ undef, 2 ] } ] } }
+ },
+ ] } }
+
+ # query
+ (SELECT ?) UNION (SELECT ?)
+ [ 1, 2 ]
+
+ # expr
+ { -union_all => [
+ { -select => { _ => { -value => 1 } } },
+ { -select => { _ => { -value => 2 } } },
+ { -select => { _ => { -value => 1 } } },
+ ] }
+
+ # aqt
+ { -union => {
+ queries => [
+ { -select =>
+ { select => { -op => [ ',', { -bind => [ undef, 1 ] } ] } }
+ },
+ { -select =>
+ { select => { -op => [ ',', { -bind => [ undef, 2 ] } ] } }
+ },
+ { -select =>
+ { select => { -op => [ ',', { -bind => [ undef, 1 ] } ] } }
+ },
+ ],
+ type => 'all',
+ } }
+
+ # query
+ (SELECT ?) UNION ALL (SELECT ?) UNION ALL (SELECT ?)
+ [ 1, 2, 1 ]
+
+=head1 STATEMENT EXTENSIONS
+
+=head2 group by clause for select
+
+Expanded as a list with an ident default:
+
+ # expr
+ { -select => { group_by => [ 'foo', 'bar' ] } }
+
+ # aqt
+ { -select => { group_by =>
+ {
+ -op => [ ',', { -ident => [ 'foo' ] }, { -ident => [ 'bar' ] } ]
+ }
+ } }
+
+ # query
+ GROUP BY foo, bar
+ []
+
+=head2 having clause for select
+
+Basic expr, just like where, given having is pretty much post-group-by
+where clause:
+
+ # expr
+ { -select =>
+ { having => { '>' => [ { -count => { -ident => 'foo' } }, 3 ] } }
+ }
+
+ # aqt
+ { -select => { having => { -op => [
+ '>', { -func => [ 'count', { -ident => [ 'foo' ] } ] },
+ { -bind => [ undef, 3 ] },
+ ] } } }
+
+ # query
+ HAVING COUNT(foo) > ?
+ [ 3 ]
+
+=head2 setop clauses
+
+If a select query contains a clause matching any of the setop node types,
+clauses that appear before the setop would in the resulting query are
+gathered together and moved into an inner select node:
+
+ # expr
+ { -select => {
+ _ => '*',
+ from => 'foo',
+ order_by => 'baz',
+ union =>
+ {
+ -select => { _ => '*', from => 'bar', where => { thing => 1 } }
+ },
+ where => { thing => 1 },
+ } }
+
+ # aqt
+ { -select => {
+ order_by => { -op => [ ',', { -ident => [ 'baz' ] } ] },
+ setop => { -union => { queries => [
+ { -select => {
+ from => { -ident => [ 'foo' ] },
+ select => { -op => [ ',', { -ident => [ '*' ] } ] },
+ where => { -op => [
+ '=', { -ident => [ 'thing' ] },
+ { -bind => [ 'thing', 1 ] },
+ ] },
+ } }, ] },
+ { -select => {
+ from => { -ident => [ 'bar' ] },
+ select => { -op => [ ',', { -ident => [ '*' ] } ] },
+ where => { -op => [
+ '=', { -ident => [ 'thing' ] },
+ { -bind => [ 'thing', 1 ] },
+ } },
+ ] } },
+ } }
+
+ # query
+ (SELECT * FROM foo WHERE thing = ?) UNION (
+ SELECT * FROM bar WHERE thing = ?
+ )
+ ORDER BY baz
+ [ 1, 1 ]
+
+=head2 update from clause
+
+Some databases allow an additional FROM clause to reference other tables
+for the data to update; this clause is expanded as a normal from list, check
+your database for what is and isn't allowed in practice.
+
+ # expr
+ { -update => {
+ _ => 'employees',
+ from => 'accounts',
+ set => { sales_count => { sales_count => { '+' => \1 } } },
+ where => {
+ 'accounts.name' => { '=' => \"'Acme Corporation'" },
+ 'employees.id' => { -ident => 'accounts.sales_person' },
+ },
+ } }
+
+ # aqt
+ { -update => {
+ from => { -ident => [ 'accounts' ] },
+ set => { -op => [
+ ',', { -op => [
+ '=', { -ident => [ 'sales_count' ] }, { -op => [
+ '+', { -ident => [ 'sales_count' ] },
+ { -literal => [ 1 ] },
+ ] },
+ ] },
+ ] },
+ target => { -ident => [ 'employees' ] },
+ where => { -op => [
+ 'and', { -op => [
+ '=', { -ident => [ 'accounts', 'name' ] },
+ { -literal => [ "'Acme Corporation'" ] },
+ ] }, { -op => [
+ '=', { -ident => [ 'employees', 'id' ] },
+ { -ident => [ 'accounts', 'sales_person' ] },
+ ] },
+ ] },
+ } }
+
+ # query
+ UPDATE employees SET sales_count = sales_count + 1 FROM accounts
+ WHERE (
+ accounts.name = 'Acme Corporation'
+ AND employees.id = accounts.sales_person
+ )
+
+ []
+
+ []
+
+=head2 delete using clause
+
+Some databases allow an additional USING clause to reference other tables
+for the data to update; this clause is expanded as a normal from list, check
+your database for what is and isn't allowed in practice.
+
+ # expr
+ { -delete => {
+ from => 'x',
+ using => 'y',
+ where => { 'x.id' => { -ident => 'y.x_id' } },
+ } }
+
+ # aqt
+ { -delete => {
+ target => { -op => [ ',', { -ident => [ 'x' ] } ] },
+ using => { -ident => [ 'y' ] },
+ where => { -op => [
+ '=', { -ident => [ 'x', 'id' ] },
+ { -ident => [ 'y', 'x_id' ] },
+ ] },
+ } }
+
+ # query
+ DELETE FROM x USING y WHERE x.id = y.x_id
+ []
+
=cut