Commit | Line | Data |
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1 | package Data::Query::Renderer::SQL::Naive; |
2 | |
3 | use strictures 1; |
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4 | |
5 | sub intersperse { my $i = shift; my @i = map +($_, $i), @_; pop @i; @i } |
6 | |
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7 | use SQL::ReservedWords; |
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8 | use Data::Query::Constants qw( |
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9 | DQ_IDENTIFIER DQ_OPERATOR DQ_VALUE DQ_JOIN DQ_ALIAS DQ_ORDER DQ_LITERAL |
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10 | ); |
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11 | |
12 | sub new { |
13 | bless({ %{$_[1]||{}} }, (ref($_[0])||$_[0]))->BUILDALL; |
14 | } |
15 | |
16 | sub BUILDALL { |
17 | my $self = shift; |
18 | $self->{reserved_ident_parts} |
19 | ||= ( |
20 | our $_DEFAULT_RESERVED ||= { map +($_ => 1), SQL::ReservedWords->words } |
21 | ); |
22 | $self->{quote_chars}||=['']; |
23 | $self->{simple_ops}||=$self->_default_simple_ops; |
24 | return $self; |
25 | } |
26 | |
27 | sub _default_simple_ops { |
28 | +{ |
f8343502 |
29 | (map +($_ => 'binop'), qw(= > < >= <= != LIKE), 'NOT LIKE' ), |
30 | (map +($_ => 'unop'), qw(NOT) ), |
31 | (map +($_ => 'unop_reverse'), ('IS NULL', 'IS NOT NULL')), |
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32 | (map +($_ => 'flatten'), qw(AND OR) ), |
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33 | (map +($_ => 'in'), ('IN', 'NOT IN')), |
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34 | (map +($_ => 'between'), ('BETWEEN', 'NOT BETWEEN')), |
35 | (apply => 'apply'), |
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36 | } |
37 | } |
38 | |
39 | sub render { |
40 | my $self = shift; |
41 | $self->_flatten_structure($self->_render(@_)) |
42 | } |
43 | |
44 | sub _flatten_structure { |
45 | my ($self, $struct) = @_; |
46 | my @bind; |
bdb576cb |
47 | [ do { |
48 | my @p = map { |
49 | my $r = ref; |
50 | if (!$r) { $_ } |
51 | elsif ($r eq 'ARRAY') { |
52 | my ($sql, @b) = @{$self->_flatten_structure($_)}; |
53 | push @bind, @b; |
54 | $sql; |
55 | } |
56 | elsif ($r eq 'HASH') { push @bind, $_; () } |
57 | else { die "_flatten_structure can't handle ref type $r for $_" } |
58 | } @$struct; |
59 | join '', map { |
60 | ($p[$_], (($p[$_+1]||',') eq ',') ? () : (' ')) |
61 | } 0 .. $#p; |
62 | }, |
63 | @bind |
64 | ]; |
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65 | } |
66 | |
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67 | # I presented this to permit strange people to easily supply a patch to lc() |
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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. |
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71 | # |
72 | # Then I realised that SQL::Abstract compatibility work required it. |
73 | # |
74 | # FEH. |
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75 | |
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76 | sub _format_keyword { $_[0]->{lc_keywords} ? lc($_[1]) : $_[1] } |
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77 | |
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78 | sub _render { |
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79 | $_[0]->${\"_render_${\(lc($_[1]->{type})||'broken')}"}($_[1]); |
80 | } |
81 | |
82 | sub _render_broken { |
83 | my ($self, $dq) = @_; |
84 | require Data::Dumper::Concise; |
85 | die "Broken DQ entry: ".Data::Dumper::Concise::Dumper($dq); |
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86 | } |
87 | |
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}; |
95 | return [ |
96 | join |
97 | $_[0]->{identifier_sep}||'.', |
98 | map +( |
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/ |
103 | ? $q1.$_.$q2 |
104 | : $_ |
105 | ) |
106 | ), @i |
107 | ]; |
108 | } |
109 | |
110 | sub _render_value { |
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111 | [ '?', $_[1] ] |
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112 | } |
113 | |
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114 | sub _operator_type { 'SQL.Naive' } |
115 | |
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116 | sub _render_operator { |
117 | my ($self, $dq) = @_; |
118 | my $op = $dq->{operator}; |
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119 | unless (exists $op->{$self->_operator_type}) { |
120 | $op->{$self->_operator_type} = $self->_convert_op($dq); |
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121 | } |
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122 | my $op_name = $op->{$self->_operator_type}; |
123 | if (my $op_type = $self->{simple_ops}{$op_name}) { |
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124 | return $self->${\"_handle_op_type_${op_type}"}($op_name, $dq); |
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125 | } elsif (my $meth = $self->can("_handle_op_special_${op_name}")) { |
126 | return $self->$meth($dq); |
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127 | } |
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128 | if (my $argc = @{$dq->{args}}) { |
129 | if ($argc == 1) { |
130 | return $self->_handle_op_type_unop($op_name, $dq); |
131 | } elsif ($argc == 2) { |
132 | return $self->_handle_op_type_binop($op_name, $dq); |
133 | } |
134 | } |
135 | die "Unsure how to handle ${op_name}"; |
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136 | } |
137 | |
138 | sub _handle_op_type_binop { |
139 | my ($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; |
143 | [ |
144 | $self->_render($dq->{args}[0]), |
145 | $op_name, |
146 | $self->_render($dq->{args}[1]), |
147 | ] |
148 | } |
149 | |
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; |
155 | [ |
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156 | '(', |
157 | $op_name, |
158 | $self->_render($dq->{args}[0]), |
159 | ')', |
160 | ] |
161 | } |
162 | |
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; |
168 | [ |
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169 | $self->_render($dq->{args}[0]), |
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170 | $op_name, |
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171 | ] |
172 | } |
173 | |
174 | sub _handle_op_type_flatten { |
175 | my ($self, $op_name, $dq) = @_; |
176 | my @argq = @{$dq->{args}}; |
177 | my @arg_final; |
178 | while (my $arg = shift @argq) { |
179 | |
180 | unless ($arg->{type} eq DQ_OPERATOR) { |
181 | push @arg_final, $arg; |
182 | next; |
183 | } |
184 | |
185 | my $op = $arg->{operator}; |
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186 | unless (exists $op->{$self->_operator_type}) { |
187 | $op->{$self->_operator_type} = $self->_convert_op($arg); |
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188 | } |
189 | |
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190 | if ($op->{$self->_operator_type} eq $op_name) { |
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191 | unshift @argq, @{$arg->{args}}; |
192 | } else { |
193 | push @arg_final, $arg; |
194 | } |
195 | } |
196 | my @sql = ('(', map +($self->_render($_), $op_name), @arg_final); |
197 | $sql[-1] = ')'; # replace final AND or whatever with ) |
198 | \@sql; |
199 | } |
200 | |
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201 | sub _handle_op_type_in { |
202 | my ($self, $op, $dq) = @_; |
203 | my ($lhs, @in) = @{$dq->{args}}; |
204 | my @rhs = ('(', map +($self->_render($_), ','), @in); |
205 | $rhs[-1] = ')'; |
206 | [ $self->_render($lhs), $op, @rhs ]; |
207 | } |
208 | |
209 | sub _handle_op_type_between { |
210 | my ($self, $op_name, $dq) = @_; |
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211 | my @args = @{$dq->{args}}; |
212 | if (@args == 3) { |
213 | my ($lhs, $rhs1, $rhs2) = (map $self->_render($_), @args); |
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214 | [ '(', $lhs, $op_name, $rhs1, 'AND', $rhs2, ')' ]; |
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215 | } elsif (@args == 2 and $args[1]->{type} eq DQ_LITERAL) { |
216 | my ($lhs, $rhs) = (map $self->_render($_), @args); |
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217 | [ '(', $lhs, $op_name, $rhs, ')' ]; |
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218 | } else { |
219 | die "Invalid args for between: ${\scalar @args} given"; |
220 | } |
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221 | } |
222 | |
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223 | sub _handle_op_type_apply { |
224 | my ($self, $op_name, $dq) = @_; |
225 | my ($func, @args) = @{$dq->{args}}; |
226 | die "Function name must be identifier" |
227 | unless $func->{type} eq DQ_IDENTIFIER; |
54a46537 |
228 | my $ident = do { |
229 | # The problem we have here is that built-ins can't be quoted, generally. |
230 | # I rather wonder if things like MAX(...) need to -not- be handled as |
231 | # an apply and instead of something else, maybe a parenop type - but |
232 | # as an explicitly Naive renderer this seems like a reasonable answer. |
233 | local @{$self}{qw(reserved_ident_parts always_quote)}; |
234 | $self->_render_identifier($func)->[0]; |
235 | }; |
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236 | [ |
237 | "$ident(", |
238 | (map $self->_render($_), @args), |
239 | ')' |
240 | ] |
241 | } |
242 | |
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243 | sub _convert_op { |
244 | my ($self, $dq) = @_; |
245 | if (my $perl_op = $dq->{'operator'}->{'Perl'}) { |
246 | for ($perl_op) { |
247 | $_ eq '==' and return '='; |
248 | $_ eq 'eq' and return '='; |
249 | $_ eq '!' and return 'NOT'; |
250 | } |
251 | return uc $perl_op; # hope! |
252 | } |
253 | die "Can't convert non-perl op yet"; |
254 | } |
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255 | |
256 | sub _render_select { |
257 | my ($self, $dq) = @_; |
258 | die "Empty select list" unless @{$dq->{select}}; |
259 | |
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 |
262 | |
bdb576cb |
263 | my @select = map [ |
264 | ($_->{type} eq DQ_ALIAS |
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265 | ? $self->_render_alias($_, $self->_format_keyword('AS')) |
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266 | : $self->_render($_) |
267 | ), |
268 | ',' |
269 | ], @{$dq->{select}}; |
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270 | |
271 | # we put the commas inside the [] for each entry as a hint to the pretty |
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272 | # printer downstream so now we need to eliminate the comma from the last |
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273 | # entry - we know there always is one due to the die guard at the top |
274 | |
275 | pop @{$select[-1]}; |
276 | |
277 | return [ |
278 | $self->_format_keyword('SELECT'), |
279 | \@select, |
280 | # if present this may be a bare FROM, a FROM+WHERE, or a FROM+WHERE+GROUP |
281 | # since we're the SELECT and therefore always come first, we don't care. |
2cf0bb42 |
282 | ($dq->{from} |
283 | ? ($self->_format_keyword('FROM'), @{$self->_render($dq->{from})}) |
284 | : () |
285 | ) |
286 | ]; |
287 | } |
288 | |
289 | sub _render_alias { |
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290 | my ($self, $dq, $as) = @_; |
2cf0bb42 |
291 | # FROM foo foo -> FROM foo |
292 | # FROM foo.bar bar -> FROM foo.bar |
293 | if ($dq->{alias}{type} eq DQ_IDENTIFIER) { |
294 | if ($dq->{alias}{elements}[-1] eq $dq->{as}) { |
295 | return $self->_render($dq->{alias}); |
296 | } |
297 | } |
298 | return [ |
299 | $self->_render($dq->{alias}), |
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300 | $as || ' ', |
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301 | $self->_render_identifier({ elements => [ $dq->{as} ] }) |
302 | ]; |
303 | } |
304 | |
305 | sub _render_literal { |
306 | my ($self, $dq) = @_; |
307 | unless ($dq->{subtype} eq 'SQL') { |
308 | die "Can't render non-SQL literal"; |
309 | } |
5edb4362 |
310 | if ($dq->{literal}) { |
311 | return [ |
312 | $dq->{literal}, @{$dq->{values}||[]} |
313 | ]; |
314 | } elsif ($dq->{parts}) { |
315 | return [ map $self->_render($_), @{$dq->{parts}} ]; |
316 | } else { |
317 | die "Invalid SQL literal - neither 'literal' nor 'parts' found"; |
318 | } |
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319 | } |
320 | |
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321 | sub _render_join { |
322 | my ($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) ]; |
327 | } |
328 | |
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329 | sub _render_where { |
330 | my ($self, $dq) = @_; |
331 | my ($from, $where) = @{$dq}{qw(from where)}; |
332 | [ |
333 | ($from ? $self->_render($from) : ()), |
334 | $self->_format_keyword('WHERE'), |
335 | $self->_render($where) |
336 | ] |
337 | } |
338 | |
339 | sub _render_order { |
340 | my ($self, $dq) = @_; |
341 | my @ret = ( |
342 | $self->_format_keyword('ORDER BY'), |
343 | $self->_render($dq->{by}), |
344 | ($dq->{direction} ? $self->_format_keyword($dq->{direction}) : ()) |
345 | ); |
346 | my $from; |
347 | while ($from = $dq->{from}) { |
348 | last unless $from->{type} eq DQ_ORDER; |
349 | $dq = $from; |
350 | push @ret, ( |
351 | ',', |
352 | $self->_render($dq->{by}), |
353 | ($dq->{direction} ? $self->_format_keyword($dq->{direction}) : ()) |
354 | ); |
355 | } |
356 | unshift @ret, $self->_render($from) if $from; |
357 | \@ret; |
358 | } |
359 | |
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360 | sub _render_delete { |
361 | my ($self, $dq) = @_; |
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362 | my ($target, $where) = @{$dq}{qw(target where)}; |
363 | [ $self->_format_keyword('DELETE FROM'), |
364 | $self->_render($target), |
365 | ($where |
366 | ? ($self->_format_keyword('WHERE'), $self->_render($where)) |
367 | : ()) |
368 | ]; |
369 | } |
370 | |
371 | sub _render_update { |
372 | my ($self, $dq) = @_; |
373 | my ($target, $set, $where) = @{$dq}{qw(target set where)}; |
a5c0a2d5 |
374 | unless ($set) { |
375 | die "Must have set key - names+value keys not yet tested"; |
376 | my ($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 ]; |
380 | } |
87867dad |
381 | my @rendered_set = intersperse( |
382 | ',', map [ intersperse('=', map $self->_render($_), @$_) ], @{$set} |
383 | ); |
384 | [ $self->_format_keyword('UPDATE'), |
385 | $self->_render($target), |
386 | $self->_format_keyword('SET'), |
387 | @rendered_set, |
388 | ($where |
389 | ? ($self->_format_keyword('WHERE'), $self->_render($where)) |
390 | : ()) |
391 | ]; |
dc657ce1 |
392 | } |
393 | |
a5c0a2d5 |
394 | sub _render_insert { |
395 | my ($self, $dq) = @_; |
396 | my ($target, $names, $values, $returning) |
397 | = @{$dq}{qw(target names values returning)}; |
398 | unless ($values) { |
399 | die "Must have values key - sets key not yet implemented"; |
400 | } |
401 | [ $self->_format_keyword('INSERT INTO'), |
402 | $self->_render($target), |
403 | ($names |
404 | ? ('(', intersperse(',', map $self->_render($_), @$names), ')') |
405 | : ()), |
406 | $self->_format_keyword('VALUES'), |
407 | intersperse(',', |
408 | map [ '(', intersperse(',', map $self->_render($_), @$_), ')' ], |
409 | @$values |
410 | ), |
411 | ($returning |
412 | ? ($self->_format_keyword('RETURNING'), |
413 | intersperse(',', map $self->_render($_), @$returning)) |
414 | : ()), |
415 | ]; |
416 | } |
417 | |
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418 | 1; |