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 identifier_sep => (is => 'ro', default => sub { '.' });
24 has simple_ops => (is => 'ro', builder => '_default_simple_ops');
26 has lc_keywords => (is => 'ro', default => sub { 0 });
28 has always_quote => (is => 'ro', default => sub { 0 });
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 || $res_check->{+uc} || /\W/
117 sub _operator_type { 'SQL.Naive' }
119 sub _render_operator {
120 my ($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 ${op_name}";
141 sub _handle_op_type_binop {
142 my ($self, $op_name, $dq) = @_;
143 die "${op_name} registered as binary op but args contain "
144 .scalar(@{$dq->{args}})." entries"
145 unless @{$dq->{args}} == 2;
147 $self->_render($dq->{args}[0]),
149 $self->_render($dq->{args}[1]),
153 sub _handle_op_type_unop {
154 my ($self, $op_name, $dq) = @_;
155 die "${op_name} registered as unary op but args contain "
156 .scalar(@{$dq->{args}})." entries"
157 unless @{$dq->{args}} == 1;
161 $self->_render($dq->{args}[0]),
166 sub _handle_op_type_unop_reverse {
167 my ($self, $op_name, $dq) = @_;
168 die "${op_name} registered as unary op but args contain "
169 .scalar(@{$dq->{args}})." entries"
170 unless @{$dq->{args}} == 1;
172 $self->_render($dq->{args}[0]),
177 sub _handle_op_type_flatten {
178 my ($self, $op_name, $dq) = @_;
179 my @argq = @{$dq->{args}};
181 while (my $arg = shift @argq) {
183 unless ($arg->{type} eq DQ_OPERATOR) {
184 push @arg_final, $arg;
188 my $op = $arg->{operator};
189 unless (exists $op->{$self->_operator_type}) {
190 $op->{$self->_operator_type} = $self->_convert_op($arg);
193 if ($op->{$self->_operator_type} eq $op_name) {
194 unshift @argq, @{$arg->{args}};
196 push @arg_final, $arg;
201 $self->_format_keyword($op_name),
202 map $self->_render($_), @arg_final
208 sub _handle_op_type_in {
209 my ($self, $op, $dq) = @_;
210 my ($lhs, @in) = @{$dq->{args}};
211 [ $self->_render($lhs),
214 intersperse(',', map $self->_render($_), @in),
219 sub _handle_op_type_between {
220 my ($self, $op_name, $dq) = @_;
221 my @args = @{$dq->{args}};
223 my ($lhs, $rhs1, $rhs2) = (map $self->_render($_), @args);
224 [ '(', $lhs, $op_name, $rhs1, 'AND', $rhs2, ')' ];
225 } elsif (@args == 2 and $args[1]->{type} eq DQ_LITERAL) {
226 my ($lhs, $rhs) = (map $self->_render($_), @args);
227 [ '(', $lhs, $op_name, $rhs, ')' ];
229 die "Invalid args for between: ${\scalar @args} given";
233 sub _handle_op_type_apply {
234 my ($self, $op_name, $dq) = @_;
235 my ($func, @args) = @{$dq->{args}};
236 die "Function name must be identifier"
237 unless $func->{type} eq DQ_IDENTIFIER;
239 # The problem we have here is that built-ins can't be quoted, generally.
240 # I rather wonder if things like MAX(...) need to -not- be handled as
241 # an apply and instead of something else, maybe a parenop type - but
242 # as an explicitly Naive renderer this seems like a reasonable answer.
243 local @{$self}{qw(reserved_ident_parts always_quote)};
244 $self->_render_identifier($func)->[0];
248 intersperse(',', map $self->_render($_), @args),
254 my ($self, $dq) = @_;
255 if (my $perl_op = $dq->{'operator'}->{'Perl'}) {
257 $_ eq '==' and return '=';
258 $_ eq 'eq' and return '=';
259 $_ eq '!' and return 'NOT';
261 return uc $perl_op; # hope!
263 die "Can't convert non-perl op yet";
267 my ($self, $dq) = @_;
268 die "Empty select list" unless @{$dq->{select}};
270 # it is, in fact, completely valid for there to be nothing for us
271 # to project from since many databases handle 'SELECT 1;' fine
273 my @select = intersperse(',',
274 map +($_->{type} eq DQ_ALIAS
275 ? $self->_render_alias($_, $self->_format_keyword('AS'))
276 : $self->_render($_)), @{$dq->{select}}
280 $self->_format_keyword('SELECT'),
282 # if present this may be a bare FROM, a FROM+WHERE, or a FROM+WHERE+GROUP
283 # since we're the SELECT and therefore always come first, we don't care.
285 ? ($self->_format_keyword('FROM'), @{$self->_render($dq->{from})})
292 my ($self, $dq, $as) = @_;
293 # FROM foo foo -> FROM foo
294 # FROM foo.bar bar -> FROM foo.bar
295 if ($dq->{alias}{type} eq DQ_IDENTIFIER) {
296 if ($dq->{alias}{elements}[-1] eq $dq->{as}) {
297 return $self->_render($dq->{alias});
301 $self->_render($dq->{alias}),
303 $self->_render_identifier({ elements => [ $dq->{as} ] })
307 sub _render_literal {
308 my ($self, $dq) = @_;
309 unless ($dq->{subtype} eq 'SQL') {
310 die "Can't render non-SQL literal";
312 if ($dq->{literal}) {
314 $dq->{literal}, @{$dq->{values}||[]}
316 } elsif ($dq->{parts}) {
317 return [ map $self->_render($_), @{$dq->{parts}} ];
319 die "Invalid SQL literal - neither 'literal' nor 'parts' found";
324 my ($self, $dq) = @_;
325 my ($left, $right) = @{$dq->{join}};
326 die "No support for ON yet" if $dq->{on};
327 die "No support for LEFT/RIGHT yet" if $dq->{outer};
328 [ $self->_render($left), ',', $self->_render($right) ];
332 my ($self, $dq) = @_;
333 my ($from, $where) = @{$dq}{qw(from where)};
335 ($from ? $self->_render($from) : ()),
336 $self->_format_keyword('WHERE'),
337 $self->_render($where)
342 my ($self, $dq) = @_;
344 $self->_format_keyword('ORDER BY'),
345 $self->_render($dq->{by}),
346 ($dq->{direction} ? $self->_format_keyword($dq->{direction}) : ())
349 while ($from = $dq->{from}) {
350 last unless $from->{type} eq DQ_ORDER;
354 $self->_render($dq->{by}),
355 ($dq->{direction} ? $self->_format_keyword($dq->{direction}) : ())
358 unshift @ret, $self->_render($from) if $from;
363 my ($self, $dq) = @_;
364 my ($target, $where) = @{$dq}{qw(target where)};
365 [ $self->_format_keyword('DELETE FROM'),
366 $self->_render($target),
368 ? ($self->_format_keyword('WHERE'), $self->_render($where))
374 my ($self, $dq) = @_;
375 my ($target, $set, $where) = @{$dq}{qw(target set where)};
377 die "Must have set key - names+value keys not yet tested";
378 my ($names, $value) = @{$dq}{qw(names value)};
379 die "Must have names and value or set" unless $names and $value;
380 die "names and value must be same size" unless @$names == @$value;
381 $set = [ map [ $names->[$_], $value->[$_] ], 0..$#$names ];
383 my @rendered_set = intersperse(
384 ',', map [ intersperse('=', map $self->_render($_), @$_) ], @{$set}
386 [ $self->_format_keyword('UPDATE'),
387 $self->_render($target),
388 $self->_format_keyword('SET'),
391 ? ($self->_format_keyword('WHERE'), $self->_render($where))
397 my ($self, $dq) = @_;
398 my ($target, $names, $values, $returning)
399 = @{$dq}{qw(target names values returning)};
401 die "Must have values key - sets key not yet implemented";
403 [ $self->_format_keyword('INSERT INTO'),
404 $self->_render($target),
406 ? ('(', intersperse(',', map $self->_render($_), @$names), ')')
408 $self->_format_keyword('VALUES'),
410 map [ '(', intersperse(',', map $self->_render($_), @$_), ')' ],
414 ? ($self->_format_keyword('RETURNING'),
415 intersperse(',', map $self->_render($_), @$returning))