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
14 has reserved_ident_parts => (
15 is => 'ro', default => sub {
16 our $_DEFAULT_RESERVED ||= { map +($_ => 1), SQL::ReservedWords->words }
20 has quote_chars => (is => 'ro', default => sub { [''] });
22 has simple_ops => (is => 'ro', builder => '_default_simple_ops');
24 sub _default_simple_ops {
26 (map +($_ => 'binop'), qw(= > < >= <= != LIKE), 'NOT LIKE' ),
27 (map +($_ => 'unop'), qw(NOT) ),
28 (map +($_ => 'unop_reverse'), ('IS NULL', 'IS NOT NULL')),
29 (map +($_ => 'flatten'), qw(AND OR) ),
30 (map +($_ => 'in'), ('IN', 'NOT IN')),
31 (map +($_ => 'between'), ('BETWEEN', 'NOT BETWEEN')),
38 $self->_flatten_structure($self->_render(@_))
41 sub _flatten_structure {
42 my ($self, $struct) = @_;
48 elsif ($r eq 'ARRAY') {
49 my ($sql, @b) = @{$self->_flatten_structure($_)};
53 elsif ($r eq 'HASH') { push @bind, $_; () }
54 else { die "_flatten_structure can't handle ref type $r for $_" }
57 ($p[$_], (($p[$_+1]||',') eq ',') ? () : (' '))
64 # I presented this to permit strange people to easily supply a patch to lc()
65 # their keywords, as I have heard many desire to do, lest they infect me
66 # with whatever malady caused this desire by their continued proximity for
67 # want of such a feature.
69 # Then I realised that SQL::Abstract compatibility work required it.
73 sub _format_keyword { $_[0]->{lc_keywords} ? lc($_[1]) : $_[1] }
76 $_[0]->${\"_render_${\(lc($_[1]->{type})||'broken')}"}($_[1]);
81 require Data::Dumper::Concise;
82 die "Broken DQ entry: ".Data::Dumper::Concise::Dumper($dq);
85 sub _render_identifier {
86 die "Unidentified identifier (SQL can no has \$_)"
87 unless my @i = @{$_[1]->{elements}};
88 # handle single or paired quote chars
89 my ($q1, $q2) = @{$_[0]->quote_chars}[0,-1];
90 my $always_quote = $_[0]->{always_quote};
91 my $res_check = $_[0]->reserved_ident_parts;
94 $_[0]->{identifier_sep}||'.',
96 $_ eq '*' # Yes, this means you can't have a column just called '*'.
97 ? $_ # Yes, this is a feature. Go shoot the DBA if he disagrees.
98 : ( # reserved are stored uc, quote if non-word
99 $always_quote || $res_check->{+uc} || /\W/
111 sub _operator_type { 'SQL.Naive' }
113 sub _render_operator {
114 my ($self, $dq) = @_;
115 my $op = $dq->{operator};
116 unless (exists $op->{$self->_operator_type}) {
117 $op->{$self->_operator_type} = $self->_convert_op($dq);
119 my $op_name = $op->{$self->_operator_type};
120 if (my $op_type = $self->{simple_ops}{$op_name}) {
121 return $self->${\"_handle_op_type_${op_type}"}($op_name, $dq);
122 } elsif (my $meth = $self->can("_handle_op_special_${op_name}")) {
123 return $self->$meth($dq);
125 if (my $argc = @{$dq->{args}}) {
127 return $self->_handle_op_type_unop($op_name, $dq);
128 } elsif ($argc == 2) {
129 return $self->_handle_op_type_binop($op_name, $dq);
132 die "Unsure how to handle ${op_name}";
135 sub _handle_op_type_binop {
136 my ($self, $op_name, $dq) = @_;
137 die "${op_name} registered as binary op but args contain "
138 .scalar(@{$dq->{args}})." entries"
139 unless @{$dq->{args}} == 2;
141 $self->_render($dq->{args}[0]),
143 $self->_render($dq->{args}[1]),
147 sub _handle_op_type_unop {
148 my ($self, $op_name, $dq) = @_;
149 die "${op_name} registered as unary op but args contain "
150 .scalar(@{$dq->{args}})." entries"
151 unless @{$dq->{args}} == 1;
155 $self->_render($dq->{args}[0]),
160 sub _handle_op_type_unop_reverse {
161 my ($self, $op_name, $dq) = @_;
162 die "${op_name} registered as unary op but args contain "
163 .scalar(@{$dq->{args}})." entries"
164 unless @{$dq->{args}} == 1;
166 $self->_render($dq->{args}[0]),
171 sub _handle_op_type_flatten {
172 my ($self, $op_name, $dq) = @_;
173 my @argq = @{$dq->{args}};
175 while (my $arg = shift @argq) {
177 unless ($arg->{type} eq DQ_OPERATOR) {
178 push @arg_final, $arg;
182 my $op = $arg->{operator};
183 unless (exists $op->{$self->_operator_type}) {
184 $op->{$self->_operator_type} = $self->_convert_op($arg);
187 if ($op->{$self->_operator_type} eq $op_name) {
188 unshift @argq, @{$arg->{args}};
190 push @arg_final, $arg;
195 $self->_format_keyword($op_name),
196 map $self->_render($_), @arg_final
202 sub _handle_op_type_in {
203 my ($self, $op, $dq) = @_;
204 my ($lhs, @in) = @{$dq->{args}};
205 [ $self->_render($lhs),
208 intersperse(',', map $self->_render($_), @in),
213 sub _handle_op_type_between {
214 my ($self, $op_name, $dq) = @_;
215 my @args = @{$dq->{args}};
217 my ($lhs, $rhs1, $rhs2) = (map $self->_render($_), @args);
218 [ '(', $lhs, $op_name, $rhs1, 'AND', $rhs2, ')' ];
219 } elsif (@args == 2 and $args[1]->{type} eq DQ_LITERAL) {
220 my ($lhs, $rhs) = (map $self->_render($_), @args);
221 [ '(', $lhs, $op_name, $rhs, ')' ];
223 die "Invalid args for between: ${\scalar @args} given";
227 sub _handle_op_type_apply {
228 my ($self, $op_name, $dq) = @_;
229 my ($func, @args) = @{$dq->{args}};
230 die "Function name must be identifier"
231 unless $func->{type} eq DQ_IDENTIFIER;
233 # The problem we have here is that built-ins can't be quoted, generally.
234 # I rather wonder if things like MAX(...) need to -not- be handled as
235 # an apply and instead of something else, maybe a parenop type - but
236 # as an explicitly Naive renderer this seems like a reasonable answer.
237 local @{$self}{qw(reserved_ident_parts always_quote)};
238 $self->_render_identifier($func)->[0];
242 intersperse(',', map $self->_render($_), @args),
248 my ($self, $dq) = @_;
249 if (my $perl_op = $dq->{'operator'}->{'Perl'}) {
251 $_ eq '==' and return '=';
252 $_ eq 'eq' and return '=';
253 $_ eq '!' and return 'NOT';
255 return uc $perl_op; # hope!
257 die "Can't convert non-perl op yet";
261 my ($self, $dq) = @_;
262 die "Empty select list" unless @{$dq->{select}};
264 # it is, in fact, completely valid for there to be nothing for us
265 # to project from since many databases handle 'SELECT 1;' fine
267 my @select = intersperse(',',
268 map +($_->{type} eq DQ_ALIAS
269 ? $self->_render_alias($_, $self->_format_keyword('AS'))
270 : $self->_render($_)), @{$dq->{select}}
274 $self->_format_keyword('SELECT'),
276 # if present this may be a bare FROM, a FROM+WHERE, or a FROM+WHERE+GROUP
277 # since we're the SELECT and therefore always come first, we don't care.
279 ? ($self->_format_keyword('FROM'), @{$self->_render($dq->{from})})
286 my ($self, $dq, $as) = @_;
287 # FROM foo foo -> FROM foo
288 # FROM foo.bar bar -> FROM foo.bar
289 if ($dq->{alias}{type} eq DQ_IDENTIFIER) {
290 if ($dq->{alias}{elements}[-1] eq $dq->{as}) {
291 return $self->_render($dq->{alias});
295 $self->_render($dq->{alias}),
297 $self->_render_identifier({ elements => [ $dq->{as} ] })
301 sub _render_literal {
302 my ($self, $dq) = @_;
303 unless ($dq->{subtype} eq 'SQL') {
304 die "Can't render non-SQL literal";
306 if ($dq->{literal}) {
308 $dq->{literal}, @{$dq->{values}||[]}
310 } elsif ($dq->{parts}) {
311 return [ map $self->_render($_), @{$dq->{parts}} ];
313 die "Invalid SQL literal - neither 'literal' nor 'parts' found";
318 my ($self, $dq) = @_;
319 my ($left, $right) = @{$dq->{join}};
320 die "No support for ON yet" if $dq->{on};
321 die "No support for LEFT/RIGHT yet" if $dq->{outer};
322 [ $self->_render($left), ',', $self->_render($right) ];
326 my ($self, $dq) = @_;
327 my ($from, $where) = @{$dq}{qw(from where)};
329 ($from ? $self->_render($from) : ()),
330 $self->_format_keyword('WHERE'),
331 $self->_render($where)
336 my ($self, $dq) = @_;
338 $self->_format_keyword('ORDER BY'),
339 $self->_render($dq->{by}),
340 ($dq->{direction} ? $self->_format_keyword($dq->{direction}) : ())
343 while ($from = $dq->{from}) {
344 last unless $from->{type} eq DQ_ORDER;
348 $self->_render($dq->{by}),
349 ($dq->{direction} ? $self->_format_keyword($dq->{direction}) : ())
352 unshift @ret, $self->_render($from) if $from;
357 my ($self, $dq) = @_;
358 my ($target, $where) = @{$dq}{qw(target where)};
359 [ $self->_format_keyword('DELETE FROM'),
360 $self->_render($target),
362 ? ($self->_format_keyword('WHERE'), $self->_render($where))
368 my ($self, $dq) = @_;
369 my ($target, $set, $where) = @{$dq}{qw(target set where)};
371 die "Must have set key - names+value keys not yet tested";
372 my ($names, $value) = @{$dq}{qw(names value)};
373 die "Must have names and value or set" unless $names and $value;
374 die "names and value must be same size" unless @$names == @$value;
375 $set = [ map [ $names->[$_], $value->[$_] ], 0..$#$names ];
377 my @rendered_set = intersperse(
378 ',', map [ intersperse('=', map $self->_render($_), @$_) ], @{$set}
380 [ $self->_format_keyword('UPDATE'),
381 $self->_render($target),
382 $self->_format_keyword('SET'),
385 ? ($self->_format_keyword('WHERE'), $self->_render($where))
391 my ($self, $dq) = @_;
392 my ($target, $names, $values, $returning)
393 = @{$dq}{qw(target names values returning)};
395 die "Must have values key - sets key not yet implemented";
397 [ $self->_format_keyword('INSERT INTO'),
398 $self->_render($target),
400 ? ('(', intersperse(',', map $self->_render($_), @$names), ')')
402 $self->_format_keyword('VALUES'),
404 map [ '(', intersperse(',', map $self->_render($_), @$_), ')' ],
408 ? ($self->_format_keyword('RETURNING'),
409 intersperse(',', map $self->_render($_), @$returning))