1 package Data::Query::Renderer::SQL::Naive;
5 sub intersperse { my $i = shift; my @i = map +($_, $i), @_; pop @i; @i }
7 use SQL::ReservedWords;
8 use Data::Query::ExprHelpers;
12 has reserved_ident_parts => (
13 is => 'ro', default => sub {
14 our $_DEFAULT_RESERVED ||= { map +($_ => 1), SQL::ReservedWords->words }
18 has quote_chars => (is => 'ro', default => sub { [''] });
20 has identifier_sep => (is => 'ro', default => sub { '.' });
22 has simple_ops => (is => 'ro', builder => '_default_simple_ops');
24 has lc_keywords => (is => 'ro', default => sub { 0 });
26 has always_quote => (is => 'ro', default => sub { 0 });
28 has collapse_aliases => (is => 'ro', default => sub { 1 });
30 sub _default_simple_ops {
32 (map +($_ => 'binop'), qw(= > < >= <= != LIKE), 'NOT LIKE' ),
33 (map +($_ => 'unop'), qw(NOT) ),
34 (map +($_ => 'unop_reverse'), ('IS NULL', 'IS NOT NULL')),
35 (map +($_ => 'flatten'), qw(AND OR) ),
36 (map +($_ => 'in'), ('IN', 'NOT IN')),
37 (map +($_ => 'between'), ('BETWEEN', 'NOT BETWEEN')),
44 $self->_flatten_structure($self->_render(@_))
47 sub _flatten_structure {
48 my ($self, $struct) = @_;
54 elsif ($r eq 'ARRAY') {
55 my ($sql, @b) = @{$self->_flatten_structure($_)};
59 elsif ($r eq 'HASH') { push @bind, $_; () }
60 else { die "_flatten_structure can't handle ref type $r for $_" }
63 ($p[$_], (($p[$_+1]||',') eq ',') ? () : (' '))
70 # I presented this to permit strange people to easily supply a patch to lc()
71 # their keywords, as I have heard many desire to do, lest they infect me
72 # with whatever malady caused this desire by their continued proximity for
73 # want of such a feature.
75 # Then I realised that SQL::Abstract compatibility work required it.
79 sub _format_keyword { $_[0]->lc_keywords ? lc($_[1]) : $_[1] }
82 $_[0]->${\"_render_${\(lc($_[1]->{type})||'broken')}"}($_[1]);
87 require Data::Dumper::Concise;
88 die "Broken DQ entry: ".Data::Dumper::Concise::Dumper($dq);
91 sub _render_identifier {
92 die "Unidentified identifier (SQL can no has \$_)"
93 unless my @i = @{$_[1]->{elements}};
94 # handle single or paired quote chars
95 my ($q1, $q2) = @{$_[0]->quote_chars}[0,-1];
96 my $always_quote = $_[0]->always_quote;
97 my $res_check = $_[0]->reserved_ident_parts;
100 $_[0]->identifier_sep,
102 $_ eq '*' # Yes, this means you can't have a column just called '*'.
103 ? $_ # Yes, this is a feature. Go shoot the DBA if he disagrees.
104 : ( # reserved are stored uc, quote if non-word
105 ($always_quote and $q1) || $res_check->{+uc} || /\W/
117 sub _operator_type { 'SQL.Naive' }
119 sub _render_operator {
120 my ($self, $dq) = @_;
121 my $op = $dq->{operator};
122 unless (exists $op->{$self->_operator_type}) {
123 $op->{$self->_operator_type} = $self->_convert_op($dq);
125 my $op_name = $op->{$self->_operator_type};
126 if (my $op_type = $self->simple_ops->{$op_name}) {
127 return $self->${\"_handle_op_type_${op_type}"}($op_name, $dq);
128 } elsif (my $meth = $self->can("_handle_op_special_${op_name}")) {
129 return $self->$meth($dq);
131 if (my $argc = @{$dq->{args}}) {
133 return $self->_handle_op_type_unop($op_name, $dq);
134 } elsif ($argc == 2) {
135 return $self->_handle_op_type_binop($op_name, $dq);
138 die "Unsure how to handle ${op_name}";
141 sub _maybe_parenthesise {
142 my ($self, $dq) = @_;
144 return is_Select() || is_Slice()
145 ? [ '(', $self->_render($dq), ')' ]
146 : $self->_render($dq);
150 sub _handle_op_type_binop {
151 my ($self, $op_name, $dq) = @_;
152 die "${op_name} registered as binary op but args contain "
153 .scalar(@{$dq->{args}})." entries"
154 unless @{$dq->{args}} == 2;
156 $self->_maybe_parenthesise($dq->{args}[0]),
158 $self->_maybe_parenthesise($dq->{args}[1]),
162 sub _handle_op_type_unop {
163 my ($self, $op_name, $dq) = @_;
164 die "${op_name} registered as unary op but args contain "
165 .scalar(@{$dq->{args}})." entries"
166 unless @{$dq->{args}} == 1;
170 $self->_render($dq->{args}[0]),
175 sub _handle_op_type_unop_reverse {
176 my ($self, $op_name, $dq) = @_;
177 die "${op_name} registered as unary op but args contain "
178 .scalar(@{$dq->{args}})." entries"
179 unless @{$dq->{args}} == 1;
181 $self->_render($dq->{args}[0]),
186 sub _handle_op_type_flatten {
187 my ($self, $op_name, $dq) = @_;
188 my @argq = @{$dq->{args}};
190 while (my $arg = shift @argq) {
192 unless (is_Operator($arg)) {
193 push @arg_final, $arg;
197 my $op = $arg->{operator};
198 unless (exists $op->{$self->_operator_type}) {
199 $op->{$self->_operator_type} = $self->_convert_op($arg);
202 if ($op->{$self->_operator_type} eq $op_name) {
203 unshift @argq, @{$arg->{args}};
205 push @arg_final, $arg;
210 $self->_format_keyword($op_name),
211 map $self->_maybe_parenthesise($_), @arg_final
217 sub _handle_op_type_in {
218 my ($self, $op, $dq) = @_;
219 my ($lhs, @in) = @{$dq->{args}};
220 [ $self->_render($lhs),
223 intersperse(',', map $self->_render($_), @in),
228 sub _handle_op_type_between {
229 my ($self, $op_name, $dq) = @_;
230 my @args = @{$dq->{args}};
232 my ($lhs, $rhs1, $rhs2) = (map $self->_maybe_parenthesise($_), @args);
233 [ '(', $lhs, $op_name, $rhs1, 'AND', $rhs2, ')' ];
234 } elsif (@args == 2 and is_Literal $args[1]->{type}) {
235 my ($lhs, $rhs) = (map $self->_render($_), @args);
236 [ '(', $lhs, $op_name, $rhs, ')' ];
238 die "Invalid args for between: ${\scalar @args} given";
242 sub _handle_op_type_apply {
243 my ($self, $op_name, $dq) = @_;
244 my ($func, @args) = @{$dq->{args}};
245 die "Function name must be identifier"
246 unless is_Identifier $func;
248 # The problem we have here is that built-ins can't be quoted, generally.
249 # I rather wonder if things like MAX(...) need to -not- be handled as
250 # an apply and instead of something else, maybe a parenop type - but
251 # as an explicitly Naive renderer this seems like a reasonable answer.
252 local @{$self}{qw(reserved_ident_parts always_quote)};
253 $self->_render_identifier($func)->[0];
257 intersperse(',', map $self->_maybe_parenthesise($_), @args),
263 my ($self, $dq) = @_;
264 if (my $perl_op = $dq->{'operator'}->{'Perl'}) {
266 $_ eq '==' and return '=';
267 $_ eq 'eq' and return '=';
268 $_ eq '!' and return 'NOT';
270 return uc $perl_op; # hope!
272 die "Can't convert non-perl op yet";
276 my ($self, $dq) = @_;
277 die "Empty select list" unless @{$dq->{select}};
279 # it is, in fact, completely valid for there to be nothing for us
280 # to project from since many databases handle 'SELECT 1;' fine
282 my @select = intersperse(',',
284 ? $self->_render_alias($_, $self->_format_keyword('AS'))
285 : $self->_render($_)), @{$dq->{select}}
289 $self->_format_keyword('SELECT'),
291 # if present this may be a bare FROM, a FROM+WHERE, or a FROM+WHERE+GROUP
292 # since we're the SELECT and therefore always come first, we don't care.
294 ? ($self->_format_keyword('FROM'), @{$self->_render($dq->{from})})
301 my ($self, $dq, $as) = @_;
302 # FROM foo foo -> FROM foo
303 # FROM foo.bar bar -> FROM foo.bar
304 if ($self->collapse_aliases) {
305 if (is_Identifier(my $from = $dq->{from})) {
306 if ($from->{elements}[-1] eq $dq->{to}) {
307 return $self->_render($from);
312 $self->_maybe_parenthesise($dq->{from}),
314 $self->_render_identifier({ elements => [ $dq->{to} ] })
318 sub _render_literal {
319 my ($self, $dq) = @_;
320 unless ($dq->{subtype} eq 'SQL') {
321 die "Can't render non-SQL literal";
323 if (defined($dq->{literal})) {
325 $dq->{literal}, @{$dq->{values}||[]}
327 } elsif ($dq->{parts}) {
328 return [ map $self->_render($_), @{$dq->{parts}} ];
330 die "Invalid SQL literal - neither 'literal' nor 'parts' found";
335 my ($self, $dq) = @_;
336 my ($left, $right) = @{$dq}{qw(left right)};
339 $self->_format_keyword(uc($dq->{outer}).' JOIN');
340 } elsif ($dq->{on}) {
341 $self->_format_keyword('JOIN');
346 my $rhs = $self->_render($right);
348 $self->_render($left), $join,
349 (is_Join($right) ? ('(', $rhs, ')') : $rhs),
351 ? ($self->_format_keyword('ON'), $self->_render($dq->{on}))
357 my ($self, $dq) = @_;
358 my ($from, $where) = @{$dq}{qw(from where)};
359 my $keyword = (is_Group($from) ? 'HAVING' : 'WHERE');
361 ($from ? $self->_render($from) : ()),
362 $self->_format_keyword($keyword),
363 $self->_render($where)
368 my ($self, $dq) = @_;
370 $self->_format_keyword('ORDER BY'),
371 $self->_render($dq->{by}),
373 ? $self->_format_keyword('DESC')
377 while ($from = $dq->{from}) {
378 last unless is_Order $from;
382 $self->_render($dq->{by}),
384 ? $self->_format_keyword('DESC')
388 unshift @ret, $self->_render($from) if $from;
393 my ($self, $dq) = @_;
394 # this could also squash like order does. but I dunno whether that should
395 # move somewhere else just yet.
397 ($dq->{from} ? $self->_render($dq->{from}) : ()),
400 $self->_format_keyword('GROUP BY'),
401 intersperse(',', map $self->_render($_), @{$dq->{by}})
409 my ($self, $dq) = @_;
410 my ($target, $where) = @{$dq}{qw(target where)};
411 [ $self->_format_keyword('DELETE FROM'),
412 $self->_render($target),
414 ? ($self->_format_keyword('WHERE'), $self->_render($where))
420 my ($self, $dq) = @_;
421 my ($target, $set, $where) = @{$dq}{qw(target set where)};
423 die "Must have set key - names+value keys not yet tested";
424 my ($names, $value) = @{$dq}{qw(names value)};
425 die "Must have names and value or set" unless $names and $value;
426 die "names and value must be same size" unless @$names == @$value;
427 $set = [ map [ $names->[$_], $value->[$_] ], 0..$#$names ];
429 my @rendered_set = intersperse(
430 ',', map [ intersperse('=', map $self->_render($_), @$_) ], @{$set}
432 [ $self->_format_keyword('UPDATE'),
433 $self->_render($target),
434 $self->_format_keyword('SET'),
437 ? ($self->_format_keyword('WHERE'), $self->_render($where))
443 my ($self, $dq) = @_;
444 my ($target, $names, $values, $returning)
445 = @{$dq}{qw(target names values returning)};
447 die "Must have values key - sets key not yet implemented";
449 [ $self->_format_keyword('INSERT INTO'),
450 $self->_render($target),
452 ? ('(', intersperse(',', map $self->_render($_), @$names), ')')
454 $self->_format_keyword('VALUES'),
456 map [ '(', intersperse(',', map $self->_render($_), @$_), ')' ],
460 ? ($self->_format_keyword('RETURNING'),
461 intersperse(',', map $self->_render($_), @$returning))