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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 | |
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12 | use Moo; |
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13 | |
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14 | has reserved_ident_parts => ( |
15 | is => 'ro', default => sub { |
16 | our $_DEFAULT_RESERVED ||= { map +($_ => 1), SQL::ReservedWords->words } |
17 | } |
18 | ); |
19 | |
20 | has quote_chars => (is => 'ro', default => sub { [''] }); |
21 | |
22 | has simple_ops => (is => 'ro', builder => '_default_simple_ops'); |
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23 | |
24 | sub _default_simple_ops { |
25 | +{ |
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26 | (map +($_ => 'binop'), qw(= > < >= <= != LIKE), 'NOT LIKE' ), |
27 | (map +($_ => 'unop'), qw(NOT) ), |
28 | (map +($_ => 'unop_reverse'), ('IS NULL', 'IS NOT NULL')), |
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29 | (map +($_ => 'flatten'), qw(AND OR) ), |
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30 | (map +($_ => 'in'), ('IN', 'NOT IN')), |
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31 | (map +($_ => 'between'), ('BETWEEN', 'NOT BETWEEN')), |
32 | (apply => 'apply'), |
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33 | } |
34 | } |
35 | |
36 | sub render { |
37 | my $self = shift; |
38 | $self->_flatten_structure($self->_render(@_)) |
39 | } |
40 | |
41 | sub _flatten_structure { |
42 | my ($self, $struct) = @_; |
43 | my @bind; |
bdb576cb |
44 | [ do { |
45 | my @p = map { |
46 | my $r = ref; |
47 | if (!$r) { $_ } |
48 | elsif ($r eq 'ARRAY') { |
49 | my ($sql, @b) = @{$self->_flatten_structure($_)}; |
50 | push @bind, @b; |
51 | $sql; |
52 | } |
53 | elsif ($r eq 'HASH') { push @bind, $_; () } |
54 | else { die "_flatten_structure can't handle ref type $r for $_" } |
55 | } @$struct; |
56 | join '', map { |
57 | ($p[$_], (($p[$_+1]||',') eq ',') ? () : (' ')) |
58 | } 0 .. $#p; |
59 | }, |
60 | @bind |
61 | ]; |
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62 | } |
63 | |
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64 | # I presented this to permit strange people to easily supply a patch to lc() |
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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. |
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68 | # |
69 | # Then I realised that SQL::Abstract compatibility work required it. |
70 | # |
71 | # FEH. |
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72 | |
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73 | sub _format_keyword { $_[0]->{lc_keywords} ? lc($_[1]) : $_[1] } |
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74 | |
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75 | sub _render { |
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76 | $_[0]->${\"_render_${\(lc($_[1]->{type})||'broken')}"}($_[1]); |
77 | } |
78 | |
79 | sub _render_broken { |
80 | my ($self, $dq) = @_; |
81 | require Data::Dumper::Concise; |
82 | die "Broken DQ entry: ".Data::Dumper::Concise::Dumper($dq); |
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83 | } |
84 | |
85 | sub _render_identifier { |
86 | die "Unidentified identifier (SQL can no has \$_)" |
87 | unless my @i = @{$_[1]->{elements}}; |
88 | # handle single or paired quote chars |
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89 | my ($q1, $q2) = @{$_[0]->quote_chars}[0,-1]; |
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90 | my $always_quote = $_[0]->{always_quote}; |
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91 | my $res_check = $_[0]->reserved_ident_parts; |
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92 | return [ |
93 | join |
94 | $_[0]->{identifier_sep}||'.', |
95 | map +( |
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/ |
100 | ? $q1.$_.$q2 |
101 | : $_ |
102 | ) |
103 | ), @i |
104 | ]; |
105 | } |
106 | |
107 | sub _render_value { |
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108 | [ '?', $_[1] ] |
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109 | } |
110 | |
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111 | sub _operator_type { 'SQL.Naive' } |
112 | |
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113 | sub _render_operator { |
114 | my ($self, $dq) = @_; |
115 | my $op = $dq->{operator}; |
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116 | unless (exists $op->{$self->_operator_type}) { |
117 | $op->{$self->_operator_type} = $self->_convert_op($dq); |
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118 | } |
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119 | my $op_name = $op->{$self->_operator_type}; |
120 | if (my $op_type = $self->{simple_ops}{$op_name}) { |
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121 | return $self->${\"_handle_op_type_${op_type}"}($op_name, $dq); |
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122 | } elsif (my $meth = $self->can("_handle_op_special_${op_name}")) { |
123 | return $self->$meth($dq); |
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124 | } |
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125 | if (my $argc = @{$dq->{args}}) { |
126 | if ($argc == 1) { |
127 | return $self->_handle_op_type_unop($op_name, $dq); |
128 | } elsif ($argc == 2) { |
129 | return $self->_handle_op_type_binop($op_name, $dq); |
130 | } |
131 | } |
132 | die "Unsure how to handle ${op_name}"; |
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133 | } |
134 | |
135 | sub _handle_op_type_binop { |
136 | my ($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; |
140 | [ |
141 | $self->_render($dq->{args}[0]), |
142 | $op_name, |
143 | $self->_render($dq->{args}[1]), |
144 | ] |
145 | } |
146 | |
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; |
152 | [ |
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153 | '(', |
154 | $op_name, |
155 | $self->_render($dq->{args}[0]), |
156 | ')', |
157 | ] |
158 | } |
159 | |
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; |
165 | [ |
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166 | $self->_render($dq->{args}[0]), |
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167 | $op_name, |
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168 | ] |
169 | } |
170 | |
171 | sub _handle_op_type_flatten { |
172 | my ($self, $op_name, $dq) = @_; |
173 | my @argq = @{$dq->{args}}; |
174 | my @arg_final; |
175 | while (my $arg = shift @argq) { |
176 | |
177 | unless ($arg->{type} eq DQ_OPERATOR) { |
178 | push @arg_final, $arg; |
179 | next; |
180 | } |
181 | |
182 | my $op = $arg->{operator}; |
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183 | unless (exists $op->{$self->_operator_type}) { |
184 | $op->{$self->_operator_type} = $self->_convert_op($arg); |
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185 | } |
186 | |
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187 | if ($op->{$self->_operator_type} eq $op_name) { |
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188 | unshift @argq, @{$arg->{args}}; |
189 | } else { |
190 | push @arg_final, $arg; |
191 | } |
192 | } |
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193 | [ '(', |
194 | intersperse( |
195 | $self->_format_keyword($op_name), |
196 | map $self->_render($_), @arg_final |
197 | ), |
198 | ')' |
199 | ]; |
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200 | } |
201 | |
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202 | sub _handle_op_type_in { |
203 | my ($self, $op, $dq) = @_; |
204 | my ($lhs, @in) = @{$dq->{args}}; |
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205 | [ $self->_render($lhs), |
206 | $op, |
207 | '(', |
208 | intersperse(',', map $self->_render($_), @in), |
209 | ')' |
210 | ]; |
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211 | } |
212 | |
213 | sub _handle_op_type_between { |
214 | my ($self, $op_name, $dq) = @_; |
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215 | my @args = @{$dq->{args}}; |
216 | if (@args == 3) { |
217 | my ($lhs, $rhs1, $rhs2) = (map $self->_render($_), @args); |
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218 | [ '(', $lhs, $op_name, $rhs1, 'AND', $rhs2, ')' ]; |
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219 | } elsif (@args == 2 and $args[1]->{type} eq DQ_LITERAL) { |
220 | my ($lhs, $rhs) = (map $self->_render($_), @args); |
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221 | [ '(', $lhs, $op_name, $rhs, ')' ]; |
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222 | } else { |
223 | die "Invalid args for between: ${\scalar @args} given"; |
224 | } |
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225 | } |
226 | |
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227 | sub _handle_op_type_apply { |
228 | my ($self, $op_name, $dq) = @_; |
229 | my ($func, @args) = @{$dq->{args}}; |
230 | die "Function name must be identifier" |
231 | unless $func->{type} eq DQ_IDENTIFIER; |
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232 | my $ident = do { |
233 | # The problem we have here is that built-ins can't be quoted, generally. |
234 | # I rather wonder if things like MAX(...) need to -not- be handled as |
235 | # an apply and instead of something else, maybe a parenop type - but |
236 | # as an explicitly Naive renderer this seems like a reasonable answer. |
237 | local @{$self}{qw(reserved_ident_parts always_quote)}; |
238 | $self->_render_identifier($func)->[0]; |
239 | }; |
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240 | [ |
241 | "$ident(", |
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242 | intersperse(',', map $self->_render($_), @args), |
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243 | ')' |
244 | ] |
245 | } |
246 | |
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247 | sub _convert_op { |
248 | my ($self, $dq) = @_; |
249 | if (my $perl_op = $dq->{'operator'}->{'Perl'}) { |
250 | for ($perl_op) { |
251 | $_ eq '==' and return '='; |
252 | $_ eq 'eq' and return '='; |
253 | $_ eq '!' and return 'NOT'; |
254 | } |
255 | return uc $perl_op; # hope! |
256 | } |
257 | die "Can't convert non-perl op yet"; |
258 | } |
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259 | |
260 | sub _render_select { |
261 | my ($self, $dq) = @_; |
262 | die "Empty select list" unless @{$dq->{select}}; |
263 | |
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 |
266 | |
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267 | my @select = intersperse(',', |
268 | map +($_->{type} eq DQ_ALIAS |
269 | ? $self->_render_alias($_, $self->_format_keyword('AS')) |
270 | : $self->_render($_)), @{$dq->{select}} |
271 | ); |
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272 | |
273 | return [ |
274 | $self->_format_keyword('SELECT'), |
275 | \@select, |
276 | # if present this may be a bare FROM, a FROM+WHERE, or a FROM+WHERE+GROUP |
277 | # since we're the SELECT and therefore always come first, we don't care. |
2cf0bb42 |
278 | ($dq->{from} |
279 | ? ($self->_format_keyword('FROM'), @{$self->_render($dq->{from})}) |
280 | : () |
281 | ) |
282 | ]; |
283 | } |
284 | |
285 | sub _render_alias { |
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286 | my ($self, $dq, $as) = @_; |
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287 | # FROM foo foo -> FROM foo |
288 | # FROM foo.bar bar -> FROM foo.bar |
289 | if ($dq->{alias}{type} eq DQ_IDENTIFIER) { |
290 | if ($dq->{alias}{elements}[-1] eq $dq->{as}) { |
291 | return $self->_render($dq->{alias}); |
292 | } |
293 | } |
294 | return [ |
295 | $self->_render($dq->{alias}), |
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296 | $as || ' ', |
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297 | $self->_render_identifier({ elements => [ $dq->{as} ] }) |
298 | ]; |
299 | } |
300 | |
301 | sub _render_literal { |
302 | my ($self, $dq) = @_; |
303 | unless ($dq->{subtype} eq 'SQL') { |
304 | die "Can't render non-SQL literal"; |
305 | } |
5edb4362 |
306 | if ($dq->{literal}) { |
307 | return [ |
308 | $dq->{literal}, @{$dq->{values}||[]} |
309 | ]; |
310 | } elsif ($dq->{parts}) { |
311 | return [ map $self->_render($_), @{$dq->{parts}} ]; |
312 | } else { |
313 | die "Invalid SQL literal - neither 'literal' nor 'parts' found"; |
314 | } |
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315 | } |
316 | |
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317 | sub _render_join { |
318 | my ($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) ]; |
323 | } |
324 | |
7f462f86 |
325 | sub _render_where { |
326 | my ($self, $dq) = @_; |
327 | my ($from, $where) = @{$dq}{qw(from where)}; |
328 | [ |
329 | ($from ? $self->_render($from) : ()), |
330 | $self->_format_keyword('WHERE'), |
331 | $self->_render($where) |
332 | ] |
333 | } |
334 | |
335 | sub _render_order { |
336 | my ($self, $dq) = @_; |
337 | my @ret = ( |
338 | $self->_format_keyword('ORDER BY'), |
339 | $self->_render($dq->{by}), |
340 | ($dq->{direction} ? $self->_format_keyword($dq->{direction}) : ()) |
341 | ); |
342 | my $from; |
343 | while ($from = $dq->{from}) { |
344 | last unless $from->{type} eq DQ_ORDER; |
345 | $dq = $from; |
346 | push @ret, ( |
347 | ',', |
348 | $self->_render($dq->{by}), |
349 | ($dq->{direction} ? $self->_format_keyword($dq->{direction}) : ()) |
350 | ); |
351 | } |
352 | unshift @ret, $self->_render($from) if $from; |
353 | \@ret; |
354 | } |
355 | |
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356 | sub _render_delete { |
357 | my ($self, $dq) = @_; |
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358 | my ($target, $where) = @{$dq}{qw(target where)}; |
359 | [ $self->_format_keyword('DELETE FROM'), |
360 | $self->_render($target), |
361 | ($where |
362 | ? ($self->_format_keyword('WHERE'), $self->_render($where)) |
363 | : ()) |
364 | ]; |
365 | } |
366 | |
367 | sub _render_update { |
368 | my ($self, $dq) = @_; |
369 | my ($target, $set, $where) = @{$dq}{qw(target set where)}; |
a5c0a2d5 |
370 | unless ($set) { |
371 | die "Must have set key - names+value keys not yet tested"; |
372 | my ($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 ]; |
376 | } |
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377 | my @rendered_set = intersperse( |
378 | ',', map [ intersperse('=', map $self->_render($_), @$_) ], @{$set} |
379 | ); |
380 | [ $self->_format_keyword('UPDATE'), |
381 | $self->_render($target), |
382 | $self->_format_keyword('SET'), |
383 | @rendered_set, |
384 | ($where |
385 | ? ($self->_format_keyword('WHERE'), $self->_render($where)) |
386 | : ()) |
387 | ]; |
dc657ce1 |
388 | } |
389 | |
a5c0a2d5 |
390 | sub _render_insert { |
391 | my ($self, $dq) = @_; |
392 | my ($target, $names, $values, $returning) |
393 | = @{$dq}{qw(target names values returning)}; |
394 | unless ($values) { |
395 | die "Must have values key - sets key not yet implemented"; |
396 | } |
397 | [ $self->_format_keyword('INSERT INTO'), |
398 | $self->_render($target), |
399 | ($names |
400 | ? ('(', intersperse(',', map $self->_render($_), @$names), ')') |
401 | : ()), |
402 | $self->_format_keyword('VALUES'), |
403 | intersperse(',', |
404 | map [ '(', intersperse(',', map $self->_render($_), @$_), ')' ], |
405 | @$values |
406 | ), |
407 | ($returning |
408 | ? ($self->_format_keyword('RETURNING'), |
409 | intersperse(',', map $self->_render($_), @$returning)) |
410 | : ()), |
411 | ]; |
412 | } |
413 | |
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414 | 1; |