1 package Data::Query::Renderer::SQL::Naive;
5 sub intersperse { my $i = shift; my @i = map +($_, $i), @_; pop @i; @i }
7 use SQL::ReservedWords;
8 use Data::Query::Constants qw(
9 DQ_IDENTIFIER DQ_OPERATOR DQ_VALUE DQ_JOIN DQ_ALIAS DQ_ORDER DQ_LITERAL
13 bless({ %{$_[1]||{}} }, (ref($_[0])||$_[0]))->BUILDALL;
18 $self->{reserved_ident_parts}
20 our $_DEFAULT_RESERVED ||= { map +($_ => 1), SQL::ReservedWords->words }
22 $self->{quote_chars}||=[''];
23 $self->{simple_ops}||=$self->_default_simple_ops;
27 sub _default_simple_ops {
29 (map +($_ => 'binop'), qw(= > < >= <= != LIKE), 'NOT LIKE' ),
30 (map +($_ => 'unop'), qw(NOT) ),
31 (map +($_ => 'unop_reverse'), ('IS NULL', 'IS NOT NULL')),
32 (map +($_ => 'flatten'), qw(AND OR) ),
33 (map +($_ => 'in'), ('IN', 'NOT IN')),
34 (map +($_ => 'between'), ('BETWEEN', 'NOT BETWEEN')),
41 $self->_flatten_structure($self->_render(@_))
44 sub _flatten_structure {
45 my ($self, $struct) = @_;
51 elsif ($r eq 'ARRAY') {
52 my ($sql, @b) = @{$self->_flatten_structure($_)};
56 elsif ($r eq 'HASH') { push @bind, $_; () }
57 else { die "_flatten_structure can't handle ref type $r for $_" }
60 ($p[$_], (($p[$_+1]||',') eq ',') ? () : (' '))
67 # I presented this to permit strange people to easily supply a patch to lc()
68 # their keywords, as I have heard many desire to do, lest they infect me
69 # with whatever malady caused this desire by their continued proximity for
70 # want of such a feature.
72 # Then I realised that SQL::Abstract compatibility work required it.
76 sub _format_keyword { $_[0]->{lc_keywords} ? lc($_[1]) : $_[1] }
79 $_[0]->${\"_render_${\(lc($_[1]->{type})||'broken')}"}($_[1]);
84 require Data::Dumper::Concise;
85 die "Broken DQ entry: ".Data::Dumper::Concise::Dumper($dq);
88 sub _render_identifier {
89 die "Unidentified identifier (SQL can no has \$_)"
90 unless my @i = @{$_[1]->{elements}};
91 # handle single or paired quote chars
92 my ($q1, $q2) = @{$_[0]->{quote_chars}}[0,-1];
93 my $always_quote = $_[0]->{always_quote};
94 my $res_check = $_[0]->{reserved_ident_parts};
97 $_[0]->{identifier_sep}||'.',
99 $_ eq '*' # Yes, this means you can't have a column just called '*'.
100 ? $_ # Yes, this is a feature. Go shoot the DBA if he disagrees.
101 : ( # reserved are stored uc, quote if non-word
102 $always_quote || $res_check->{+uc} || /\W/
114 sub _operator_type { 'SQL.Naive' }
116 sub _render_operator {
117 my ($self, $dq) = @_;
118 my $op = $dq->{operator};
119 unless (exists $op->{$self->_operator_type}) {
120 $op->{$self->_operator_type} = $self->_convert_op($dq);
122 my $op_name = $op->{$self->_operator_type};
123 if (my $op_type = $self->{simple_ops}{$op_name}) {
124 return $self->${\"_handle_op_type_${op_type}"}($op_name, $dq);
125 } elsif (my $meth = $self->can("_handle_op_special_${op_name}")) {
126 return $self->$meth($dq);
128 if (my $argc = @{$dq->{args}}) {
130 return $self->_handle_op_type_unop($op_name, $dq);
131 } elsif ($argc == 2) {
132 return $self->_handle_op_type_binop($op_name, $dq);
135 die "Unsure how to handle ${op_name}";
138 sub _handle_op_type_binop {
139 my ($self, $op_name, $dq) = @_;
140 die "${op_name} registered as binary op but args contain "
141 .scalar(@{$dq->{args}})." entries"
142 unless @{$dq->{args}} == 2;
144 $self->_render($dq->{args}[0]),
146 $self->_render($dq->{args}[1]),
150 sub _handle_op_type_unop {
151 my ($self, $op_name, $dq) = @_;
152 die "${op_name} registered as unary op but args contain "
153 .scalar(@{$dq->{args}})." entries"
154 unless @{$dq->{args}} == 1;
158 $self->_render($dq->{args}[0]),
163 sub _handle_op_type_unop_reverse {
164 my ($self, $op_name, $dq) = @_;
165 die "${op_name} registered as unary op but args contain "
166 .scalar(@{$dq->{args}})." entries"
167 unless @{$dq->{args}} == 1;
169 $self->_render($dq->{args}[0]),
174 sub _handle_op_type_flatten {
175 my ($self, $op_name, $dq) = @_;
176 my @argq = @{$dq->{args}};
178 while (my $arg = shift @argq) {
180 unless ($arg->{type} eq DQ_OPERATOR) {
181 push @arg_final, $arg;
185 my $op = $arg->{operator};
186 unless (exists $op->{$self->_operator_type}) {
187 $op->{$self->_operator_type} = $self->_convert_op($arg);
190 if ($op->{$self->_operator_type} eq $op_name) {
191 unshift @argq, @{$arg->{args}};
193 push @arg_final, $arg;
196 my @sql = ('(', map +($self->_render($_), $op_name), @arg_final);
197 $sql[-1] = ')'; # replace final AND or whatever with )
201 sub _handle_op_type_in {
202 my ($self, $op, $dq) = @_;
203 my ($lhs, @in) = @{$dq->{args}};
204 my @rhs = ('(', map +($self->_render($_), ','), @in);
206 [ $self->_render($lhs), $op, @rhs ];
209 sub _handle_op_type_between {
210 my ($self, $op_name, $dq) = @_;
211 my @args = @{$dq->{args}};
213 my ($lhs, $rhs1, $rhs2) = (map $self->_render($_), @args);
214 [ '(', $lhs, $op_name, $rhs1, 'AND', $rhs2, ')' ];
215 } elsif (@args == 2 and $args[1]->{type} eq DQ_LITERAL) {
216 my ($lhs, $rhs) = (map $self->_render($_), @args);
217 [ '(', $lhs, $op_name, $rhs, ')' ];
219 die "Invalid args for between: ${\scalar @args} given";
223 sub _handle_op_type_apply {
224 my ($self, $op_name, $dq) = @_;
225 my ($func, @args) = @{$dq->{args}};
226 die "Function name must be identifier"
227 unless $func->{type} eq DQ_IDENTIFIER;
229 # The problem we have here is that built-ins can't be quoted, generally.
230 # I rather wonder if things like MAX(...) need to -not- be handled as
231 # an apply and instead of something else, maybe a parenop type - but
232 # as an explicitly Naive renderer this seems like a reasonable answer.
233 local @{$self}{qw(reserved_ident_parts always_quote)};
234 $self->_render_identifier($func)->[0];
238 (map $self->_render($_), @args),
244 my ($self, $dq) = @_;
245 if (my $perl_op = $dq->{'operator'}->{'Perl'}) {
247 $_ eq '==' and return '=';
248 $_ eq 'eq' and return '=';
249 $_ eq '!' and return 'NOT';
251 return uc $perl_op; # hope!
253 die "Can't convert non-perl op yet";
257 my ($self, $dq) = @_;
258 die "Empty select list" unless @{$dq->{select}};
260 # it is, in fact, completely valid for there to be nothing for us
261 # to project from since many databases handle 'SELECT 1;' fine
264 ($_->{type} eq DQ_ALIAS
265 ? $self->_render_alias($_, $self->_format_keyword('AS'))
271 # we put the commas inside the [] for each entry as a hint to the pretty
272 # printer downstream so now we need to eliminate the comma from the last
273 # entry - we know there always is one due to the die guard at the top
278 $self->_format_keyword('SELECT'),
280 # if present this may be a bare FROM, a FROM+WHERE, or a FROM+WHERE+GROUP
281 # since we're the SELECT and therefore always come first, we don't care.
283 ? ($self->_format_keyword('FROM'), @{$self->_render($dq->{from})})
290 my ($self, $dq, $as) = @_;
291 # FROM foo foo -> FROM foo
292 # FROM foo.bar bar -> FROM foo.bar
293 if ($dq->{alias}{type} eq DQ_IDENTIFIER) {
294 if ($dq->{alias}{elements}[-1] eq $dq->{as}) {
295 return $self->_render($dq->{alias});
299 $self->_render($dq->{alias}),
301 $self->_render_identifier({ elements => [ $dq->{as} ] })
305 sub _render_literal {
306 my ($self, $dq) = @_;
307 unless ($dq->{subtype} eq 'SQL') {
308 die "Can't render non-SQL literal";
310 if ($dq->{literal}) {
312 $dq->{literal}, @{$dq->{values}||[]}
314 } elsif ($dq->{parts}) {
315 return [ map $self->_render($_), @{$dq->{parts}} ];
317 die "Invalid SQL literal - neither 'literal' nor 'parts' found";
322 my ($self, $dq) = @_;
323 my ($left, $right) = @{$dq->{join}};
324 die "No support for ON yet" if $dq->{on};
325 die "No support for LEFT/RIGHT yet" if $dq->{outer};
326 [ $self->_render($left), ',', $self->_render($right) ];
330 my ($self, $dq) = @_;
331 my ($from, $where) = @{$dq}{qw(from where)};
333 ($from ? $self->_render($from) : ()),
334 $self->_format_keyword('WHERE'),
335 $self->_render($where)
340 my ($self, $dq) = @_;
342 $self->_format_keyword('ORDER BY'),
343 $self->_render($dq->{by}),
344 ($dq->{direction} ? $self->_format_keyword($dq->{direction}) : ())
347 while ($from = $dq->{from}) {
348 last unless $from->{type} eq DQ_ORDER;
352 $self->_render($dq->{by}),
353 ($dq->{direction} ? $self->_format_keyword($dq->{direction}) : ())
356 unshift @ret, $self->_render($from) if $from;
361 my ($self, $dq) = @_;
362 my ($target, $where) = @{$dq}{qw(target where)};
363 [ $self->_format_keyword('DELETE FROM'),
364 $self->_render($target),
366 ? ($self->_format_keyword('WHERE'), $self->_render($where))
372 my ($self, $dq) = @_;
373 my ($target, $set, $where) = @{$dq}{qw(target set where)};
375 die "Must have set key - names+value keys not yet tested";
376 my ($names, $value) = @{$dq}{qw(names value)};
377 die "Must have names and value or set" unless $names and $value;
378 die "names and value must be same size" unless @$names == @$value;
379 $set = [ map [ $names->[$_], $value->[$_] ], 0..$#$names ];
381 my @rendered_set = intersperse(
382 ',', map [ intersperse('=', map $self->_render($_), @$_) ], @{$set}
384 [ $self->_format_keyword('UPDATE'),
385 $self->_render($target),
386 $self->_format_keyword('SET'),
389 ? ($self->_format_keyword('WHERE'), $self->_render($where))
395 my ($self, $dq) = @_;
396 my ($target, $names, $values, $returning)
397 = @{$dq}{qw(target names values returning)};
399 die "Must have values key - sets key not yet implemented";
401 [ $self->_format_keyword('INSERT INTO'),
402 $self->_render($target),
404 ? ('(', intersperse(',', map $self->_render($_), @$names), ')')
406 $self->_format_keyword('VALUES'),
408 map [ '(', intersperse(',', map $self->_render($_), @$_), ')' ],
412 ? ($self->_format_keyword('RETURNING'),
413 intersperse(',', map $self->_render($_), @$returning))