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::Constants qw(
9 DQ_IDENTIFIER DQ_OPERATOR DQ_VALUE DQ_JOIN DQ_ALIAS DQ_ORDER DQ_LITERAL
10 DQ_GROUP DQ_SELECT DQ_SLICE
15 has reserved_ident_parts => (
16 is => 'ro', default => sub {
17 our $_DEFAULT_RESERVED ||= { map +($_ => 1), SQL::ReservedWords->words }
21 has quote_chars => (is => 'ro', default => sub { [''] });
23 has identifier_sep => (is => 'ro', default => sub { '.' });
25 has simple_ops => (is => 'ro', builder => '_default_simple_ops');
27 has lc_keywords => (is => 'ro', default => sub { 0 });
29 has always_quote => (is => 'ro', default => sub { 0 });
31 has collapse_aliases => (is => 'ro', default => sub { 1 });
33 sub _default_simple_ops {
35 (map +($_ => 'binop'), qw(= > < >= <= != LIKE), 'NOT LIKE' ),
36 (map +($_ => 'unop'), qw(NOT) ),
37 (map +($_ => 'unop_reverse'), ('IS NULL', 'IS NOT NULL')),
38 (map +($_ => 'flatten'), qw(AND OR) ),
39 (map +($_ => 'in'), ('IN', 'NOT IN')),
40 (map +($_ => 'between'), ('BETWEEN', 'NOT BETWEEN')),
47 $self->_flatten_structure($self->_render(@_))
50 sub _flatten_structure {
51 my ($self, $struct) = @_;
57 elsif ($r eq 'ARRAY') {
58 my ($sql, @b) = @{$self->_flatten_structure($_)};
62 elsif ($r eq 'HASH') { push @bind, $_; () }
63 else { die "_flatten_structure can't handle ref type $r for $_" }
66 ($p[$_], (($p[$_+1]||',') eq ',') ? () : (' '))
73 # I presented this to permit strange people to easily supply a patch to lc()
74 # their keywords, as I have heard many desire to do, lest they infect me
75 # with whatever malady caused this desire by their continued proximity for
76 # want of such a feature.
78 # Then I realised that SQL::Abstract compatibility work required it.
82 sub _format_keyword { $_[0]->lc_keywords ? lc($_[1]) : $_[1] }
85 $_[0]->${\"_render_${\(lc($_[1]->{type})||'broken')}"}($_[1]);
90 require Data::Dumper::Concise;
91 die "Broken DQ entry: ".Data::Dumper::Concise::Dumper($dq);
94 sub _render_identifier {
95 die "Unidentified identifier (SQL can no has \$_)"
96 unless my @i = @{$_[1]->{elements}};
97 # handle single or paired quote chars
98 my ($q1, $q2) = @{$_[0]->quote_chars}[0,-1];
99 my $always_quote = $_[0]->always_quote;
100 my $res_check = $_[0]->reserved_ident_parts;
103 $_[0]->identifier_sep,
105 $_ eq '*' # Yes, this means you can't have a column just called '*'.
106 ? $_ # Yes, this is a feature. Go shoot the DBA if he disagrees.
107 : ( # reserved are stored uc, quote if non-word
108 ($always_quote and $q1) || $res_check->{+uc} || /\W/
120 sub _operator_type { 'SQL.Naive' }
122 sub _render_operator {
123 my ($self, $dq) = @_;
124 my $op = $dq->{operator};
125 unless (exists $op->{$self->_operator_type}) {
126 $op->{$self->_operator_type} = $self->_convert_op($dq);
128 my $op_name = $op->{$self->_operator_type};
129 if (my $op_type = $self->simple_ops->{$op_name}) {
130 return $self->${\"_handle_op_type_${op_type}"}($op_name, $dq);
131 } elsif (my $meth = $self->can("_handle_op_special_${op_name}")) {
132 return $self->$meth($dq);
134 if (my $argc = @{$dq->{args}}) {
136 return $self->_handle_op_type_unop($op_name, $dq);
137 } elsif ($argc == 2) {
138 return $self->_handle_op_type_binop($op_name, $dq);
141 die "Unsure how to handle ${op_name}";
144 sub _maybe_parenthesise {
145 my ($self, $dq) = @_;
146 my %parenthesise = map +($_ => 1), DQ_SELECT, DQ_SLICE;
148 ($parenthesise{$dq->{type}}
149 ? [ '(', $self->_render($dq), ')' ]
150 : $self->_render($dq));
153 sub _handle_op_type_binop {
154 my ($self, $op_name, $dq) = @_;
155 die "${op_name} registered as binary op but args contain "
156 .scalar(@{$dq->{args}})." entries"
157 unless @{$dq->{args}} == 2;
159 $self->_maybe_parenthesise($dq->{args}[0]),
161 $self->_maybe_parenthesise($dq->{args}[1]),
165 sub _handle_op_type_unop {
166 my ($self, $op_name, $dq) = @_;
167 die "${op_name} registered as unary op but args contain "
168 .scalar(@{$dq->{args}})." entries"
169 unless @{$dq->{args}} == 1;
173 $self->_render($dq->{args}[0]),
178 sub _handle_op_type_unop_reverse {
179 my ($self, $op_name, $dq) = @_;
180 die "${op_name} registered as unary op but args contain "
181 .scalar(@{$dq->{args}})." entries"
182 unless @{$dq->{args}} == 1;
184 $self->_render($dq->{args}[0]),
189 sub _handle_op_type_flatten {
190 my ($self, $op_name, $dq) = @_;
191 my @argq = @{$dq->{args}};
193 while (my $arg = shift @argq) {
195 unless ($arg->{type} eq DQ_OPERATOR) {
196 push @arg_final, $arg;
200 my $op = $arg->{operator};
201 unless (exists $op->{$self->_operator_type}) {
202 $op->{$self->_operator_type} = $self->_convert_op($arg);
205 if ($op->{$self->_operator_type} eq $op_name) {
206 unshift @argq, @{$arg->{args}};
208 push @arg_final, $arg;
213 $self->_format_keyword($op_name),
214 map $self->_maybe_parenthesise($_), @arg_final
220 sub _handle_op_type_in {
221 my ($self, $op, $dq) = @_;
222 my ($lhs, @in) = @{$dq->{args}};
223 [ $self->_render($lhs),
226 intersperse(',', map $self->_render($_), @in),
231 sub _handle_op_type_between {
232 my ($self, $op_name, $dq) = @_;
233 my @args = @{$dq->{args}};
235 my ($lhs, $rhs1, $rhs2) = (map $self->_maybe_parenthesise($_), @args);
236 [ '(', $lhs, $op_name, $rhs1, 'AND', $rhs2, ')' ];
237 } elsif (@args == 2 and $args[1]->{type} eq DQ_LITERAL) {
238 my ($lhs, $rhs) = (map $self->_render($_), @args);
239 [ '(', $lhs, $op_name, $rhs, ')' ];
241 die "Invalid args for between: ${\scalar @args} given";
245 sub _handle_op_type_apply {
246 my ($self, $op_name, $dq) = @_;
247 my ($func, @args) = @{$dq->{args}};
248 die "Function name must be identifier"
249 unless $func->{type} eq DQ_IDENTIFIER;
251 # The problem we have here is that built-ins can't be quoted, generally.
252 # I rather wonder if things like MAX(...) need to -not- be handled as
253 # an apply and instead of something else, maybe a parenop type - but
254 # as an explicitly Naive renderer this seems like a reasonable answer.
255 local @{$self}{qw(reserved_ident_parts always_quote)};
256 $self->_render_identifier($func)->[0];
260 intersperse(',', map $self->_maybe_parenthesise($_), @args),
266 my ($self, $dq) = @_;
267 if (my $perl_op = $dq->{'operator'}->{'Perl'}) {
269 $_ eq '==' and return '=';
270 $_ eq 'eq' and return '=';
271 $_ eq '!' and return 'NOT';
273 return uc $perl_op; # hope!
275 die "Can't convert non-perl op yet";
279 my ($self, $dq) = @_;
280 die "Empty select list" unless @{$dq->{select}};
282 # it is, in fact, completely valid for there to be nothing for us
283 # to project from since many databases handle 'SELECT 1;' fine
285 my @select = intersperse(',',
286 map +($_->{type} eq DQ_ALIAS
287 ? $self->_render_alias($_, $self->_format_keyword('AS'))
288 : $self->_render($_)), @{$dq->{select}}
292 $self->_format_keyword('SELECT'),
294 # if present this may be a bare FROM, a FROM+WHERE, or a FROM+WHERE+GROUP
295 # since we're the SELECT and therefore always come first, we don't care.
297 ? ($self->_format_keyword('FROM'), @{$self->_render($dq->{from})})
304 my ($self, $dq, $as) = @_;
305 # FROM foo foo -> FROM foo
306 # FROM foo.bar bar -> FROM foo.bar
307 if ($self->collapse_aliases) {
308 if ($dq->{from}{type} eq DQ_IDENTIFIER) {
309 if ($dq->{from}{elements}[-1] eq $dq->{to}) {
310 return $self->_render($dq->{from});
314 my %parenthesise = map +($_ => 1), DQ_SELECT, DQ_SLICE;
315 return [ # XXX not sure this is the right place to detect this
316 $self->_maybe_parenthesise($dq->{from}),
318 $self->_render_identifier({ elements => [ $dq->{to} ] })
322 sub _render_literal {
323 my ($self, $dq) = @_;
324 unless ($dq->{subtype} eq 'SQL') {
325 die "Can't render non-SQL literal";
327 if (defined($dq->{literal})) {
329 $dq->{literal}, @{$dq->{values}||[]}
331 } elsif ($dq->{parts}) {
332 return [ map $self->_render($_), @{$dq->{parts}} ];
334 die "Invalid SQL literal - neither 'literal' nor 'parts' found";
339 my ($self, $dq) = @_;
340 my ($left, $right) = @{$dq}{qw(left right)};
343 $self->_format_keyword(uc($dq->{outer}).' JOIN');
344 } elsif ($dq->{on}) {
345 $self->_format_keyword('JOIN');
350 my $rhs = $self->_render($right);
352 $self->_render($left), $join,
353 ($right->{type} eq DQ_JOIN ? ('(', $rhs, ')') : $rhs),
355 ? ($self->_format_keyword('ON'), $self->_render($dq->{on}))
361 my ($self, $dq) = @_;
362 my ($from, $where) = @{$dq}{qw(from where)};
363 my $keyword = ($from && $from->{type} eq DQ_GROUP) ? 'HAVING' : 'WHERE';
365 ($from ? $self->_render($from) : ()),
366 $self->_format_keyword($keyword),
367 $self->_render($where)
372 my ($self, $dq) = @_;
374 $self->_format_keyword('ORDER BY'),
375 $self->_render($dq->{by}),
377 ? $self->_format_keyword('DESC')
381 while ($from = $dq->{from}) {
382 last unless $from->{type} eq DQ_ORDER;
386 $self->_render($dq->{by}),
388 ? $self->_format_keyword('DESC')
392 unshift @ret, $self->_render($from) if $from;
397 my ($self, $dq) = @_;
398 # this could also squash like order does. but I dunno whether that should
399 # move somewhere else just yet.
401 ($dq->{from} ? $self->_render($dq->{from}) : ()),
404 $self->_format_keyword('GROUP BY'),
405 intersperse(',', map $self->_render($_), @{$dq->{by}})
413 my ($self, $dq) = @_;
414 my ($target, $where) = @{$dq}{qw(target where)};
415 [ $self->_format_keyword('DELETE FROM'),
416 $self->_render($target),
418 ? ($self->_format_keyword('WHERE'), $self->_render($where))
424 my ($self, $dq) = @_;
425 my ($target, $set, $where) = @{$dq}{qw(target set where)};
427 die "Must have set key - names+value keys not yet tested";
428 my ($names, $value) = @{$dq}{qw(names value)};
429 die "Must have names and value or set" unless $names and $value;
430 die "names and value must be same size" unless @$names == @$value;
431 $set = [ map [ $names->[$_], $value->[$_] ], 0..$#$names ];
433 my @rendered_set = intersperse(
434 ',', map [ intersperse('=', map $self->_render($_), @$_) ], @{$set}
436 [ $self->_format_keyword('UPDATE'),
437 $self->_render($target),
438 $self->_format_keyword('SET'),
441 ? ($self->_format_keyword('WHERE'), $self->_render($where))
447 my ($self, $dq) = @_;
448 my ($target, $names, $values, $returning)
449 = @{$dq}{qw(target names values returning)};
451 die "Must have values key - sets key not yet implemented";
453 [ $self->_format_keyword('INSERT INTO'),
454 $self->_render($target),
456 ? ('(', intersperse(',', map $self->_render($_), @$names), ')')
458 $self->_format_keyword('VALUES'),
460 map [ '(', intersperse(',', map $self->_render($_), @$_), ')' ],
464 ? ($self->_format_keyword('RETURNING'),
465 intersperse(',', map $self->_render($_), @$returning))