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 || $res_check->{+uc} || /\W/
111 defined($_[1]->{value})
116 sub _operator_type { 'SQL.Naive' }
118 sub _render_operator {
119 my ($self, $dq) = @_;
120 my $op = $dq->{operator};
121 unless (exists $op->{$self->_operator_type}) {
122 $op->{$self->_operator_type} = $self->_convert_op($dq);
124 my $op_name = $op->{$self->_operator_type};
125 if (my $op_type = $self->{simple_ops}{$op_name}) {
126 return $self->${\"_handle_op_type_${op_type}"}($op_name, $dq);
127 } elsif (my $meth = $self->can("_handle_op_special_${op_name}")) {
128 return $self->$meth($dq);
130 if (my $argc = @{$dq->{args}}) {
132 return $self->_handle_op_type_unop($op_name, $dq);
133 } elsif ($argc == 2) {
134 return $self->_handle_op_type_binop($op_name, $dq);
137 die "Unsure how to handle ${op_name}";
140 sub _handle_op_type_binop {
141 my ($self, $op_name, $dq) = @_;
142 die "${op_name} registered as binary op but args contain "
143 .scalar(@{$dq->{args}})." entries"
144 unless @{$dq->{args}} == 2;
146 $self->_render($dq->{args}[0]),
148 $self->_render($dq->{args}[1]),
152 sub _handle_op_type_unop {
153 my ($self, $op_name, $dq) = @_;
154 die "${op_name} registered as unary op but args contain "
155 .scalar(@{$dq->{args}})." entries"
156 unless @{$dq->{args}} == 1;
160 $self->_render($dq->{args}[0]),
165 sub _handle_op_type_unop_reverse {
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;
171 $self->_render($dq->{args}[0]),
176 sub _handle_op_type_flatten {
177 my ($self, $op_name, $dq) = @_;
178 my @argq = @{$dq->{args}};
180 while (my $arg = shift @argq) {
182 unless ($arg->{type} eq DQ_OPERATOR) {
183 push @arg_final, $arg;
187 my $op = $arg->{operator};
188 unless (exists $op->{$self->_operator_type}) {
189 $op->{$self->_operator_type} = $self->_convert_op($arg);
192 if ($op->{$self->_operator_type} eq $op_name) {
193 unshift @argq, @{$arg->{args}};
195 push @arg_final, $arg;
198 my @sql = ('(', map +($self->_render($_), $op_name), @arg_final);
199 $sql[-1] = ')'; # replace final AND or whatever with )
203 sub _handle_op_type_in {
204 my ($self, $op, $dq) = @_;
205 my ($lhs, @in) = @{$dq->{args}};
206 my @rhs = ('(', map +($self->_render($_), ','), @in);
208 [ $self->_render($lhs), $op, @rhs ];
211 sub _handle_op_type_between {
212 my ($self, $op_name, $dq) = @_;
213 my @args = @{$dq->{args}};
215 my ($lhs, $rhs1, $rhs2) = (map $self->_render($_), @args);
216 [ '(', $lhs, $op_name, $rhs1, 'AND', $rhs2, ')' ];
217 } elsif (@args == 2 and $args[1]->{type} eq DQ_LITERAL) {
218 my ($lhs, $rhs) = (map $self->_render($_), @args);
219 [ '(', $lhs, $op_name, $rhs, ')' ];
221 die "Invalid args for between: ${\scalar @args} given";
225 sub _handle_op_type_apply {
226 my ($self, $op_name, $dq) = @_;
227 my ($func, @args) = @{$dq->{args}};
228 die "Function name must be identifier"
229 unless $func->{type} eq DQ_IDENTIFIER;
231 # The problem we have here is that built-ins can't be quoted, generally.
232 # I rather wonder if things like MAX(...) need to -not- be handled as
233 # an apply and instead of something else, maybe a parenop type - but
234 # as an explicitly Naive renderer this seems like a reasonable answer.
235 local @{$self}{qw(reserved_ident_parts always_quote)};
236 $self->_render_identifier($func)->[0];
240 (map $self->_render($_), @args),
246 my ($self, $dq) = @_;
247 if (my $perl_op = $dq->{'operator'}->{'Perl'}) {
249 $_ eq '==' and return '=';
250 $_ eq 'eq' and return '=';
251 $_ eq '!' and return 'NOT';
253 return uc $perl_op; # hope!
255 die "Can't convert non-perl op yet";
259 my ($self, $dq) = @_;
260 die "Empty select list" unless @{$dq->{select}};
262 # it is, in fact, completely valid for there to be nothing for us
263 # to project from since many databases handle 'SELECT 1;' fine
266 ($_->{type} eq DQ_ALIAS
267 ? $self->_render_alias($_, $self->_format_keyword('AS'))
273 # we put the commas inside the [] for each entry as a hint to the pretty
274 # printer downstream so now we need to eliminate the comma from the last
275 # entry - we know there always is one due to the die guard at the top
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)};
376 my @rendered_set = intersperse(
377 ',', map [ intersperse('=', map $self->_render($_), @$_) ], @{$set}
379 [ $self->_format_keyword('UPDATE'),
380 $self->_render($target),
381 $self->_format_keyword('SET'),
384 ? ($self->_format_keyword('WHERE'), $self->_render($where))