Commit | Line | Data |
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1 | package # Hide from PAUSE |
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2 | DBIx::Class::SQLAHacks; |
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3 | |
4 | use base qw/SQL::Abstract::Limit/; |
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5 | use strict; |
6 | use warnings; |
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7 | use Carp::Clan qw/^DBIx::Class/; |
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8 | |
9 | sub new { |
10 | my $self = shift->SUPER::new(@_); |
11 | |
12 | # This prevents the caching of $dbh in S::A::L, I believe |
13 | # If limit_dialect is a ref (like a $dbh), go ahead and replace |
14 | # it with what it resolves to: |
15 | $self->{limit_dialect} = $self->_find_syntax($self->{limit_dialect}) |
16 | if ref $self->{limit_dialect}; |
17 | |
18 | $self; |
19 | } |
20 | |
21 | |
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22 | # Some databases (sqlite) do not handle multiple parenthesis |
23 | # around in/between arguments. A tentative x IN ( ( 1, 2 ,3) ) |
24 | # is interpreted as x IN 1 or something similar. |
25 | # |
26 | # Since we currently do not have access to the SQLA AST, resort |
27 | # to barbaric mutilation of any SQL supplied in literal form |
28 | |
29 | sub _strip_outer_paren { |
30 | my ($self, $arg) = @_; |
31 | |
32 | return $self->_SWITCH_refkind ($arg, { |
33 | ARRAYREFREF => sub { |
34 | $$arg->[0] = __strip_outer_paren ($$arg->[0]); |
35 | return $arg; |
36 | }, |
37 | SCALARREF => sub { |
38 | return \__strip_outer_paren( $$arg ); |
39 | }, |
40 | FALLBACK => sub { |
41 | return $arg |
42 | }, |
43 | }); |
44 | } |
45 | |
46 | sub __strip_outer_paren { |
47 | my $sql = shift; |
48 | |
49 | if ($sql and not ref $sql) { |
50 | while ($sql =~ /^ \s* \( (.*) \) \s* $/x ) { |
51 | $sql = $1; |
52 | } |
53 | } |
54 | |
55 | return $sql; |
56 | } |
57 | |
58 | sub _where_field_IN { |
59 | my ($self, $lhs, $op, $rhs) = @_; |
60 | $rhs = $self->_strip_outer_paren ($rhs); |
61 | return $self->SUPER::_where_field_IN ($lhs, $op, $rhs); |
62 | } |
63 | |
64 | sub _where_field_BETWEEN { |
65 | my ($self, $lhs, $op, $rhs) = @_; |
66 | $rhs = $self->_strip_outer_paren ($rhs); |
67 | return $self->SUPER::_where_field_BETWEEN ($lhs, $op, $rhs); |
68 | } |
69 | |
70 | |
71 | |
72 | # DB2 is the only remaining DB using this. Even though we are not sure if |
73 | # RowNumberOver is still needed here (should be part of SQLA) leave the |
74 | # code in place |
75 | sub _RowNumberOver { |
76 | my ($self, $sql, $order, $rows, $offset ) = @_; |
77 | |
78 | $offset += 1; |
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79 | my $last = $rows + $offset - 1; |
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80 | my ( $order_by ) = $self->_order_by( $order ); |
81 | |
82 | $sql = <<"SQL"; |
83 | SELECT * FROM |
84 | ( |
85 | SELECT Q1.*, ROW_NUMBER() OVER( ) AS ROW_NUM FROM ( |
86 | $sql |
87 | $order_by |
88 | ) Q1 |
89 | ) Q2 |
90 | WHERE ROW_NUM BETWEEN $offset AND $last |
91 | |
92 | SQL |
93 | |
94 | return $sql; |
95 | } |
96 | |
97 | |
98 | # While we're at it, this should make LIMIT queries more efficient, |
99 | # without digging into things too deeply |
100 | use Scalar::Util 'blessed'; |
101 | sub _find_syntax { |
102 | my ($self, $syntax) = @_; |
103 | |
104 | # DB2 is the only remaining DB using this. Even though we are not sure if |
105 | # RowNumberOver is still needed here (should be part of SQLA) leave the |
106 | # code in place |
107 | my $dbhname = blessed($syntax) ? $syntax->{Driver}{Name} : $syntax; |
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108 | if(ref($self) && $dbhname) { |
109 | if ($dbhname eq 'DB2') { |
110 | return 'RowNumberOver'; |
111 | } |
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112 | } |
113 | |
114 | $self->{_cached_syntax} ||= $self->SUPER::_find_syntax($syntax); |
115 | } |
116 | |
117 | sub select { |
118 | my ($self, $table, $fields, $where, $order, @rest) = @_; |
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119 | local $self->{having_bind} = []; |
120 | local $self->{from_bind} = []; |
121 | |
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122 | if (ref $table eq 'SCALAR') { |
123 | $table = $$table; |
124 | } |
125 | elsif (not ref $table) { |
126 | $table = $self->_quote($table); |
127 | } |
128 | local $self->{rownum_hack_count} = 1 |
129 | if (defined $rest[0] && $self->{limit_dialect} eq 'RowNum'); |
130 | @rest = (-1) unless defined $rest[0]; |
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131 | croak "LIMIT 0 Does Not Compute" if $rest[0] == 0; |
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132 | # and anyway, SQL::Abstract::Limit will cause a barf if we don't first |
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133 | my ($sql, @where_bind) = $self->SUPER::select( |
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134 | $table, $self->_recurse_fields($fields), $where, $order, @rest |
135 | ); |
136 | $sql .= |
137 | $self->{for} ? |
138 | ( |
139 | $self->{for} eq 'update' ? ' FOR UPDATE' : |
140 | $self->{for} eq 'shared' ? ' FOR SHARE' : |
141 | '' |
142 | ) : |
143 | '' |
144 | ; |
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145 | return wantarray ? ($sql, @{$self->{from_bind}}, @where_bind, @{$self->{having_bind}}) : $sql; |
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146 | } |
147 | |
148 | sub insert { |
149 | my $self = shift; |
150 | my $table = shift; |
151 | $table = $self->_quote($table) unless ref($table); |
152 | $self->SUPER::insert($table, @_); |
153 | } |
154 | |
155 | sub update { |
156 | my $self = shift; |
157 | my $table = shift; |
158 | $table = $self->_quote($table) unless ref($table); |
159 | $self->SUPER::update($table, @_); |
160 | } |
161 | |
162 | sub delete { |
163 | my $self = shift; |
164 | my $table = shift; |
165 | $table = $self->_quote($table) unless ref($table); |
166 | $self->SUPER::delete($table, @_); |
167 | } |
168 | |
169 | sub _emulate_limit { |
170 | my $self = shift; |
171 | if ($_[3] == -1) { |
172 | return $_[1].$self->_order_by($_[2]); |
173 | } else { |
174 | return $self->SUPER::_emulate_limit(@_); |
175 | } |
176 | } |
177 | |
178 | sub _recurse_fields { |
179 | my ($self, $fields, $params) = @_; |
180 | my $ref = ref $fields; |
181 | return $self->_quote($fields) unless $ref; |
182 | return $$fields if $ref eq 'SCALAR'; |
183 | |
184 | if ($ref eq 'ARRAY') { |
185 | return join(', ', map { |
186 | $self->_recurse_fields($_) |
187 | .(exists $self->{rownum_hack_count} && !($params && $params->{no_rownum_hack}) |
188 | ? ' AS col'.$self->{rownum_hack_count}++ |
189 | : '') |
190 | } @$fields); |
191 | } elsif ($ref eq 'HASH') { |
192 | foreach my $func (keys %$fields) { |
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193 | if ($func eq 'distinct') { |
194 | my $_fields = $fields->{$func}; |
195 | if (ref $_fields eq 'ARRAY' && @{$_fields} > 1) { |
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196 | croak "Unsupported syntax, please use " . |
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197 | "{ group_by => [ qw/" . (join ' ', @$_fields) . "/ ] }" . |
198 | " or " . |
199 | "{ select => [ qw/" . (join ' ', @$_fields) . "/ ], distinct => 1 }"; |
200 | } |
201 | else { |
202 | $_fields = @{$_fields}[0] if ref $_fields eq 'ARRAY'; |
203 | carp "This syntax will be deprecated in 09, please use " . |
204 | "{ group_by => '${_fields}' }" . |
205 | " or " . |
206 | "{ select => '${_fields}', distinct => 1 }"; |
207 | } |
208 | } |
209 | |
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210 | return $self->_sqlcase($func) |
211 | .'( '.$self->_recurse_fields($fields->{$func}).' )'; |
212 | } |
213 | } |
214 | # Is the second check absolutely necessary? |
215 | elsif ( $ref eq 'REF' and ref($$fields) eq 'ARRAY' ) { |
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216 | return $self->_fold_sqlbind( $fields ); |
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217 | } |
218 | else { |
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219 | croak($ref . qq{ unexpected in _recurse_fields()}) |
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220 | } |
221 | } |
222 | |
223 | sub _order_by { |
224 | my $self = shift; |
225 | my $ret = ''; |
226 | my @extra; |
227 | if (ref $_[0] eq 'HASH') { |
228 | if (defined $_[0]->{group_by}) { |
229 | $ret = $self->_sqlcase(' group by ') |
230 | .$self->_recurse_fields($_[0]->{group_by}, { no_rownum_hack => 1 }); |
231 | } |
232 | if (defined $_[0]->{having}) { |
233 | my $frag; |
234 | ($frag, @extra) = $self->_recurse_where($_[0]->{having}); |
235 | push(@{$self->{having_bind}}, @extra); |
236 | $ret .= $self->_sqlcase(' having ').$frag; |
237 | } |
238 | if (defined $_[0]->{order_by}) { |
239 | $ret .= $self->_order_by($_[0]->{order_by}); |
240 | } |
241 | if (grep { $_ =~ /^-(desc|asc)/i } keys %{$_[0]}) { |
242 | return $self->SUPER::_order_by($_[0]); |
243 | } |
244 | } elsif (ref $_[0] eq 'SCALAR') { |
245 | $ret = $self->_sqlcase(' order by ').${ $_[0] }; |
246 | } elsif (ref $_[0] eq 'ARRAY' && @{$_[0]}) { |
247 | my @order = @{+shift}; |
248 | $ret = $self->_sqlcase(' order by ') |
249 | .join(', ', map { |
250 | my $r = $self->_order_by($_, @_); |
251 | $r =~ s/^ ?ORDER BY //i; |
252 | $r; |
253 | } @order); |
254 | } else { |
255 | $ret = $self->SUPER::_order_by(@_); |
256 | } |
257 | return $ret; |
258 | } |
259 | |
260 | sub _order_directions { |
261 | my ($self, $order) = @_; |
262 | $order = $order->{order_by} if ref $order eq 'HASH'; |
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263 | if (ref $order eq 'HASH') { |
264 | $order = [$self->_order_directions_hash($order)]; |
265 | } elsif (ref $order eq 'ARRAY') { |
266 | $order = [map { |
267 | if (ref $_ eq 'HASH') { |
268 | $self->_order_directions_hash($_); |
269 | } else { |
270 | $_; |
271 | } |
272 | } @{ $order }]; |
273 | } |
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274 | return $self->SUPER::_order_directions($order); |
275 | } |
276 | |
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277 | sub _order_directions_hash { |
278 | my ($self, $order) = @_; |
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279 | my @new_order; |
280 | foreach my $key (keys %{ $order }) { |
281 | if ($key =~ /^-(desc|asc)/i ) { |
282 | my $direction = $1; |
283 | my $type = ref $order->{ $key }; |
284 | if ($type eq 'ARRAY') { |
285 | push @new_order, map( "$_ $direction", @{ $order->{ $key } } ); |
286 | } elsif (!$type) { |
287 | push @new_order, "$order->{$key} $direction"; |
288 | } else { |
289 | croak "hash order_by can only contain Scalar or Array, not $type"; |
290 | } |
291 | } else { |
292 | croak "$key is not a valid direction, use -asc or -desc"; |
293 | } |
294 | } |
295 | return @new_order; |
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296 | } |
297 | |
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298 | sub _table { |
299 | my ($self, $from) = @_; |
300 | if (ref $from eq 'ARRAY') { |
301 | return $self->_recurse_from(@$from); |
302 | } elsif (ref $from eq 'HASH') { |
303 | return $self->_make_as($from); |
304 | } else { |
305 | return $from; # would love to quote here but _table ends up getting called |
306 | # twice during an ->select without a limit clause due to |
307 | # the way S::A::Limit->select works. should maybe consider |
308 | # bypassing this and doing S::A::select($self, ...) in |
309 | # our select method above. meantime, quoting shims have |
310 | # been added to select/insert/update/delete here |
311 | } |
312 | } |
313 | |
314 | sub _recurse_from { |
315 | my ($self, $from, @join) = @_; |
316 | my @sqlf; |
317 | push(@sqlf, $self->_make_as($from)); |
318 | foreach my $j (@join) { |
319 | my ($to, $on) = @$j; |
320 | |
321 | # check whether a join type exists |
322 | my $join_clause = ''; |
323 | my $to_jt = ref($to) eq 'ARRAY' ? $to->[0] : $to; |
324 | if (ref($to_jt) eq 'HASH' and exists($to_jt->{-join_type})) { |
325 | $join_clause = ' '.uc($to_jt->{-join_type}).' JOIN '; |
326 | } else { |
327 | $join_clause = ' JOIN '; |
328 | } |
329 | push(@sqlf, $join_clause); |
330 | |
331 | if (ref $to eq 'ARRAY') { |
332 | push(@sqlf, '(', $self->_recurse_from(@$to), ')'); |
333 | } else { |
334 | push(@sqlf, $self->_make_as($to)); |
335 | } |
336 | push(@sqlf, ' ON ', $self->_join_condition($on)); |
337 | } |
338 | return join('', @sqlf); |
339 | } |
340 | |
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341 | sub _fold_sqlbind { |
342 | my ($self, $sqlbind) = @_; |
343 | my $sql = shift @$$sqlbind; |
344 | push @{$self->{from_bind}}, @$$sqlbind; |
345 | return $sql; |
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346 | } |
347 | |
348 | sub _make_as { |
349 | my ($self, $from) = @_; |
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350 | return join(' ', map { (ref $_ eq 'SCALAR' ? $$_ |
351 | : ref $_ eq 'REF' ? $self->_fold_sqlbind($_) |
352 | : $self->_quote($_)) |
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353 | } reverse each %{$self->_skip_options($from)}); |
354 | } |
355 | |
356 | sub _skip_options { |
357 | my ($self, $hash) = @_; |
358 | my $clean_hash = {}; |
359 | $clean_hash->{$_} = $hash->{$_} |
360 | for grep {!/^-/} keys %$hash; |
361 | return $clean_hash; |
362 | } |
363 | |
364 | sub _join_condition { |
365 | my ($self, $cond) = @_; |
366 | if (ref $cond eq 'HASH') { |
367 | my %j; |
368 | for (keys %$cond) { |
369 | my $v = $cond->{$_}; |
370 | if (ref $v) { |
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371 | croak (ref($v) . qq{ reference arguments are not supported in JOINS - try using \"..." instead'}) |
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372 | if ref($v) ne 'SCALAR'; |
373 | $j{$_} = $v; |
374 | } |
375 | else { |
376 | my $x = '= '.$self->_quote($v); $j{$_} = \$x; |
377 | } |
378 | }; |
379 | return scalar($self->_recurse_where(\%j)); |
380 | } elsif (ref $cond eq 'ARRAY') { |
381 | return join(' OR ', map { $self->_join_condition($_) } @$cond); |
382 | } else { |
383 | die "Can't handle this yet!"; |
384 | } |
385 | } |
386 | |
387 | sub _quote { |
388 | my ($self, $label) = @_; |
389 | return '' unless defined $label; |
390 | return "*" if $label eq '*'; |
391 | return $label unless $self->{quote_char}; |
392 | if(ref $self->{quote_char} eq "ARRAY"){ |
393 | return $self->{quote_char}->[0] . $label . $self->{quote_char}->[1] |
394 | if !defined $self->{name_sep}; |
395 | my $sep = $self->{name_sep}; |
396 | return join($self->{name_sep}, |
397 | map { $self->{quote_char}->[0] . $_ . $self->{quote_char}->[1] } |
398 | split(/\Q$sep\E/,$label)); |
399 | } |
400 | return $self->SUPER::_quote($label); |
401 | } |
402 | |
403 | sub limit_dialect { |
404 | my $self = shift; |
405 | $self->{limit_dialect} = shift if @_; |
406 | return $self->{limit_dialect}; |
407 | } |
408 | |
409 | sub quote_char { |
410 | my $self = shift; |
411 | $self->{quote_char} = shift if @_; |
412 | return $self->{quote_char}; |
413 | } |
414 | |
415 | sub name_sep { |
416 | my $self = shift; |
417 | $self->{name_sep} = shift if @_; |
418 | return $self->{name_sep}; |
419 | } |
420 | |
421 | 1; |
422 | |
423 | __END__ |
424 | |
425 | =pod |
426 | |
427 | =head1 NAME |
428 | |
855c6fd0 |
429 | DBIx::Class::SQLAHacks - This module is a subclass of SQL::Abstract::Limit |
430 | and includes a number of DBIC-specific workarounds, not yet suitable for |
431 | inclusion into SQLA proper. |
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432 | |
433 | =head1 METHODS |
434 | |
435 | =head2 new |
436 | |
437 | Tries to determine limit dialect. |
438 | |
439 | =head2 select |
440 | |
441 | Quotes table names, handles "limit" dialects (e.g. where rownum between x and |
442 | y), supports SELECT ... FOR UPDATE and SELECT ... FOR SHARE. |
443 | |
444 | =head2 insert update delete |
445 | |
446 | Just quotes table names. |
447 | |
448 | =head2 limit_dialect |
449 | |
450 | Specifies the dialect of used for implementing an SQL "limit" clause for |
451 | restricting the number of query results returned. Valid values are: RowNum. |
452 | |
453 | See L<DBIx::Class::Storage::DBI/connect_info> for details. |
454 | |
455 | =head2 name_sep |
456 | |
457 | Character separating quoted table names. |
458 | |
459 | See L<DBIx::Class::Storage::DBI/connect_info> for details. |
460 | |
461 | =head2 quote_char |
462 | |
463 | Set to an array-ref to specify separate left and right quotes for table names. |
464 | |
465 | See L<DBIx::Class::Storage::DBI/connect_info> for details. |
466 | |
467 | =cut |
468 | |