Commit | Line | Data |
6f4ddea1 |
1 | package # Hide from PAUSE |
855c6fd0 |
2 | DBIx::Class::SQLAHacks; |
6f4ddea1 |
3 | |
4 | use base qw/SQL::Abstract::Limit/; |
e3764383 |
5 | use strict; |
6 | use warnings; |
b2b22cd6 |
7 | use Carp::Clan qw/^DBIx::Class|^SQL::Abstract/; |
8 | |
9 | BEGIN { |
10 | # reinstall the carp()/croak() functions imported into SQL::Abstract |
11 | # as Carp and Carp::Clan do not like each other much |
12 | no warnings qw/redefine/; |
13 | no strict qw/refs/; |
14 | for my $f (qw/carp croak/) { |
329d7385 |
15 | |
b2b22cd6 |
16 | my $orig = \&{"SQL::Abstract::$f"}; |
17 | *{"SQL::Abstract::$f"} = sub { |
18 | |
19 | local $Carp::CarpLevel = 1; # even though Carp::Clan ignores this, $orig will not |
20 | |
329d7385 |
21 | if (Carp::longmess() =~ /DBIx::Class::SQLAHacks::[\w]+ .+? called \s at/x) { |
b2b22cd6 |
22 | __PACKAGE__->can($f)->(@_); |
23 | } |
24 | else { |
25 | $orig->(@_); |
26 | } |
27 | } |
28 | } |
29 | } |
6f4ddea1 |
30 | |
31 | sub new { |
32 | my $self = shift->SUPER::new(@_); |
33 | |
34 | # This prevents the caching of $dbh in S::A::L, I believe |
35 | # If limit_dialect is a ref (like a $dbh), go ahead and replace |
36 | # it with what it resolves to: |
37 | $self->{limit_dialect} = $self->_find_syntax($self->{limit_dialect}) |
38 | if ref $self->{limit_dialect}; |
39 | |
40 | $self; |
41 | } |
42 | |
43 | |
6f4ddea1 |
44 | # Some databases (sqlite) do not handle multiple parenthesis |
45 | # around in/between arguments. A tentative x IN ( ( 1, 2 ,3) ) |
46 | # is interpreted as x IN 1 or something similar. |
47 | # |
48 | # Since we currently do not have access to the SQLA AST, resort |
49 | # to barbaric mutilation of any SQL supplied in literal form |
50 | |
51 | sub _strip_outer_paren { |
52 | my ($self, $arg) = @_; |
53 | |
54 | return $self->_SWITCH_refkind ($arg, { |
55 | ARRAYREFREF => sub { |
56 | $$arg->[0] = __strip_outer_paren ($$arg->[0]); |
57 | return $arg; |
58 | }, |
59 | SCALARREF => sub { |
60 | return \__strip_outer_paren( $$arg ); |
61 | }, |
62 | FALLBACK => sub { |
63 | return $arg |
64 | }, |
65 | }); |
66 | } |
67 | |
68 | sub __strip_outer_paren { |
69 | my $sql = shift; |
70 | |
71 | if ($sql and not ref $sql) { |
72 | while ($sql =~ /^ \s* \( (.*) \) \s* $/x ) { |
73 | $sql = $1; |
74 | } |
75 | } |
76 | |
77 | return $sql; |
78 | } |
79 | |
80 | sub _where_field_IN { |
81 | my ($self, $lhs, $op, $rhs) = @_; |
82 | $rhs = $self->_strip_outer_paren ($rhs); |
83 | return $self->SUPER::_where_field_IN ($lhs, $op, $rhs); |
84 | } |
85 | |
86 | sub _where_field_BETWEEN { |
87 | my ($self, $lhs, $op, $rhs) = @_; |
88 | $rhs = $self->_strip_outer_paren ($rhs); |
89 | return $self->SUPER::_where_field_BETWEEN ($lhs, $op, $rhs); |
90 | } |
91 | |
15827712 |
92 | # Slow but ANSI standard Limit/Offset support. DB2 uses this |
6f4ddea1 |
93 | sub _RowNumberOver { |
94 | my ($self, $sql, $order, $rows, $offset ) = @_; |
95 | |
96 | $offset += 1; |
03e1d9af |
97 | my $last = $rows + $offset - 1; |
6f4ddea1 |
98 | my ( $order_by ) = $self->_order_by( $order ); |
99 | |
100 | $sql = <<"SQL"; |
101 | SELECT * FROM |
102 | ( |
103 | SELECT Q1.*, ROW_NUMBER() OVER( ) AS ROW_NUM FROM ( |
104 | $sql |
105 | $order_by |
106 | ) Q1 |
107 | ) Q2 |
108 | WHERE ROW_NUM BETWEEN $offset AND $last |
109 | |
110 | SQL |
111 | |
112 | return $sql; |
113 | } |
114 | |
15827712 |
115 | # Crappy Top based Limit/Offset support. MSSQL uses this currently, |
116 | # but may have to switch to RowNumberOver one day |
117 | sub _Top { |
118 | my ( $self, $sql, $order, $rows, $offset ) = @_; |
119 | |
b1e1d073 |
120 | # mangle the input sql so it can be properly aliased in the outer queries |
121 | $sql =~ s/^ \s* SELECT \s+ (.+?) \s+ (?=FROM)//ix |
122 | or croak "Unrecognizable SELECT: $sql"; |
42e5b103 |
123 | my $sql_select = $1; |
124 | my @sql_select = split (/\s*,\s*/, $sql_select); |
125 | |
126 | # we can't support subqueries (in fact MSSQL can't) - croak |
127 | if (@sql_select != @{$self->{_dbic_rs_attrs}{select}}) { |
128 | croak (sprintf ( |
129 | 'SQL SELECT did not parse cleanly - retrieved %d comma separated elements, while ' |
130 | . 'the resultset select attribure contains %d elements: %s', |
131 | scalar @sql_select, |
132 | scalar @{$self->{_dbic_rs_attrs}{select}}, |
133 | $sql_select, |
134 | )); |
135 | } |
b1e1d073 |
136 | |
42e5b103 |
137 | my $name_sep = $self->name_sep || '.'; |
ac93965c |
138 | my $esc_name_sep = "\Q$name_sep\E"; |
139 | my $col_re = qr/ ^ (?: (.+) $esc_name_sep )? ([^$esc_name_sep]+) $ /x; |
140 | |
141 | my $rs_alias = $self->{_dbic_rs_attrs}{alias}; |
142 | my $quoted_rs_alias = $self->_quote ($rs_alias); |
b1e1d073 |
143 | |
42e5b103 |
144 | # construct the new select lists, rename(alias) some columns if necessary |
145 | my (@outer_select, @inner_select, %seen_names, %col_aliases, %outer_col_aliases); |
b1e1d073 |
146 | |
42e5b103 |
147 | for (@{$self->{_dbic_rs_attrs}{select}}) { |
148 | next if ref $_; |
149 | my ($table, $orig_colname) = ( $_ =~ $col_re ); |
150 | next unless $table; |
151 | $seen_names{$orig_colname}++; |
152 | } |
b1e1d073 |
153 | |
42e5b103 |
154 | for my $i (0 .. $#sql_select) { |
b1e1d073 |
155 | |
42e5b103 |
156 | my $colsel_arg = $self->{_dbic_rs_attrs}{select}[$i]; |
157 | my $colsel_sql = $sql_select[$i]; |
b1e1d073 |
158 | |
42e5b103 |
159 | # this may or may not work (in case of a scalarref or something) |
160 | my ($table, $orig_colname) = ( $colsel_arg =~ $col_re ); |
b1e1d073 |
161 | |
42e5b103 |
162 | my $quoted_alias; |
163 | # do not attempt to understand non-scalar selects - alias numerically |
164 | if (ref $colsel_arg) { |
165 | $quoted_alias = $self->_quote ('column_' . (@inner_select + 1) ); |
166 | } |
167 | # column name seen more than once - alias it |
168 | elsif ($orig_colname && ($seen_names{$orig_colname} > 1) ) { |
169 | $quoted_alias = $self->_quote ("${table}__${orig_colname}"); |
170 | } |
b1e1d073 |
171 | |
42e5b103 |
172 | # we did rename - make a record and adjust |
173 | if ($quoted_alias) { |
174 | # alias inner |
175 | push @inner_select, "$colsel_sql AS $quoted_alias"; |
176 | |
177 | # push alias to outer |
178 | push @outer_select, $quoted_alias; |
179 | |
180 | # Any aliasing accumulated here will be considered |
181 | # both for inner and outer adjustments of ORDER BY |
182 | $self->__record_alias ( |
183 | \%col_aliases, |
184 | $quoted_alias, |
185 | $colsel_arg, |
186 | $table ? $orig_colname : undef, |
187 | ); |
b1e1d073 |
188 | } |
189 | |
42e5b103 |
190 | # otherwise just leave things intact inside, and use the abbreviated one outside |
191 | # (as we do not have table names anymore) |
192 | else { |
193 | push @inner_select, $colsel_sql; |
194 | |
195 | my $outer_quoted = $self->_quote ($orig_colname); # it was not a duplicate so should just work |
196 | push @outer_select, $outer_quoted; |
197 | $self->__record_alias ( |
198 | \%outer_col_aliases, |
199 | $outer_quoted, |
200 | $colsel_arg, |
201 | $table ? $orig_colname : undef, |
202 | ); |
203 | } |
b1e1d073 |
204 | } |
205 | |
206 | my $outer_select = join (', ', @outer_select ); |
42e5b103 |
207 | my $inner_select = join (', ', @inner_select ); |
b1e1d073 |
208 | |
42e5b103 |
209 | %outer_col_aliases = (%outer_col_aliases, %col_aliases); |
b1e1d073 |
210 | |
211 | # deal with order |
15827712 |
212 | croak '$order supplied to SQLAHacks limit emulators must be a hash' |
213 | if (ref $order ne 'HASH'); |
214 | |
8f6dbee9 |
215 | $order = { %$order }; #copy |
216 | |
02d133f0 |
217 | my $req_order = $order->{order_by}; |
e2db8319 |
218 | |
219 | # examine normalized version, collapses nesting |
220 | my $limit_order; |
221 | if (scalar $self->_order_by_chunks ($req_order)) { |
222 | $limit_order = $req_order; |
223 | } |
224 | else { |
e2db8319 |
225 | $limit_order = [ map |
226 | { join ('', $rs_alias, $name_sep, $_ ) } |
227 | ( $self->{_dbic_rs_attrs}{_source_handle}->resolve->primary_columns ) |
228 | ]; |
229 | } |
b1e1d073 |
230 | |
42e5b103 |
231 | my ( $order_by_inner, $order_by_outer ) = $self->_order_directions($limit_order); |
232 | my $order_by_requested = $self->_order_by ($req_order); |
15827712 |
233 | |
64c7c000 |
234 | # generate the rest |
e2db8319 |
235 | delete $order->{order_by}; |
64c7c000 |
236 | my $grpby_having = $self->_order_by ($order); |
237 | |
238 | # short circuit for counts - the ordering complexity is needless |
239 | if ($self->{_dbic_rs_attrs}{-for_count_only}) { |
240 | return "SELECT TOP $rows $inner_select $sql $grpby_having $order_by_outer"; |
241 | } |
242 | |
42e5b103 |
243 | # we can't really adjust the order_by columns, as introspection is lacking |
244 | # resort to simple substitution |
245 | for my $col (keys %outer_col_aliases) { |
246 | for ($order_by_requested, $order_by_outer) { |
247 | $_ =~ s/\s+$col\s+/ $outer_col_aliases{$col} /g; |
b1e1d073 |
248 | } |
249 | } |
42e5b103 |
250 | for my $col (keys %col_aliases) { |
251 | $order_by_inner =~ s/\s+$col\s+/$col_aliases{$col}/g; |
252 | } |
1cbd3034 |
253 | |
02d133f0 |
254 | |
42e5b103 |
255 | my $inner_lim = $rows + $offset; |
15827712 |
256 | |
618a0fe3 |
257 | $sql = "SELECT TOP $inner_lim $inner_select $sql $grpby_having $order_by_inner"; |
42e5b103 |
258 | |
259 | if ($offset) { |
260 | $sql = <<"SQL"; |
b1e1d073 |
261 | |
262 | SELECT TOP $rows $outer_select FROM |
15827712 |
263 | ( |
42e5b103 |
264 | $sql |
ac93965c |
265 | ) $quoted_rs_alias |
15827712 |
266 | $order_by_outer |
b1e1d073 |
267 | SQL |
268 | |
42e5b103 |
269 | } |
15827712 |
270 | |
42e5b103 |
271 | if ($order_by_requested) { |
b1e1d073 |
272 | $sql = <<"SQL"; |
273 | |
42e5b103 |
274 | SELECT $outer_select FROM |
ac93965c |
275 | ( $sql ) $quoted_rs_alias |
276 | $order_by_requested |
15827712 |
277 | SQL |
b1e1d073 |
278 | |
279 | } |
280 | |
ac93965c |
281 | $sql =~ s/\s*\n\s*/ /g; # parsing out multiline statements is harder than a single line |
b1e1d073 |
282 | return $sql; |
15827712 |
283 | } |
284 | |
42e5b103 |
285 | # action at a distance to shorten Top code above |
286 | sub __record_alias { |
287 | my ($self, $register, $alias, $fqcol, $col) = @_; |
288 | |
289 | # record qualified name |
290 | $register->{$fqcol} = $alias; |
291 | $register->{$self->_quote($fqcol)} = $alias; |
292 | |
293 | return unless $col; |
294 | |
b6d347e0 |
295 | # record unqualified name, undef (no adjustment) if a duplicate is found |
42e5b103 |
296 | if (exists $register->{$col}) { |
297 | $register->{$col} = undef; |
298 | } |
299 | else { |
300 | $register->{$col} = $alias; |
301 | } |
302 | |
303 | $register->{$self->_quote($col)} = $register->{$col}; |
304 | } |
305 | |
15827712 |
306 | |
6f4ddea1 |
307 | |
308 | # While we're at it, this should make LIMIT queries more efficient, |
309 | # without digging into things too deeply |
6f4ddea1 |
310 | sub _find_syntax { |
311 | my ($self, $syntax) = @_; |
ac788c46 |
312 | return $self->{_cached_syntax} ||= $self->SUPER::_find_syntax($syntax); |
6f4ddea1 |
313 | } |
314 | |
ec7cfd36 |
315 | my $for_syntax = { |
316 | update => 'FOR UPDATE', |
317 | shared => 'FOR SHARE', |
318 | }; |
6f4ddea1 |
319 | sub select { |
320 | my ($self, $table, $fields, $where, $order, @rest) = @_; |
1cbd3034 |
321 | |
322 | $self->{"${_}_bind"} = [] for (qw/having from order/); |
db56cf3d |
323 | |
6f4ddea1 |
324 | if (ref $table eq 'SCALAR') { |
325 | $table = $$table; |
326 | } |
327 | elsif (not ref $table) { |
328 | $table = $self->_quote($table); |
329 | } |
330 | local $self->{rownum_hack_count} = 1 |
331 | if (defined $rest[0] && $self->{limit_dialect} eq 'RowNum'); |
332 | @rest = (-1) unless defined $rest[0]; |
e8fcf76f |
333 | croak "LIMIT 0 Does Not Compute" if $rest[0] == 0; |
6f4ddea1 |
334 | # and anyway, SQL::Abstract::Limit will cause a barf if we don't first |
db56cf3d |
335 | my ($sql, @where_bind) = $self->SUPER::select( |
6f4ddea1 |
336 | $table, $self->_recurse_fields($fields), $where, $order, @rest |
337 | ); |
ec7cfd36 |
338 | if (my $for = delete $self->{_dbic_rs_attrs}{for}) { |
339 | $sql .= " $for_syntax->{$for}" if $for_syntax->{$for}; |
340 | } |
341 | |
1cbd3034 |
342 | return wantarray ? ($sql, @{$self->{from_bind}}, @where_bind, @{$self->{having_bind}}, @{$self->{order_bind}} ) : $sql; |
6f4ddea1 |
343 | } |
344 | |
345 | sub insert { |
346 | my $self = shift; |
347 | my $table = shift; |
348 | $table = $self->_quote($table) unless ref($table); |
7a72e5a5 |
349 | |
350 | # SQLA will emit INSERT INTO $table ( ) VALUES ( ) |
351 | # which is sadly understood only by MySQL. Change default behavior here, |
352 | # until SQLA2 comes with proper dialect support |
353 | if (! $_[0] or (ref $_[0] eq 'HASH' and !keys %{$_[0]} ) ) { |
354 | return "INSERT INTO ${table} DEFAULT VALUES" |
355 | } |
356 | |
6f4ddea1 |
357 | $self->SUPER::insert($table, @_); |
358 | } |
359 | |
360 | sub update { |
361 | my $self = shift; |
362 | my $table = shift; |
363 | $table = $self->_quote($table) unless ref($table); |
364 | $self->SUPER::update($table, @_); |
365 | } |
366 | |
367 | sub delete { |
368 | my $self = shift; |
369 | my $table = shift; |
370 | $table = $self->_quote($table) unless ref($table); |
371 | $self->SUPER::delete($table, @_); |
372 | } |
373 | |
374 | sub _emulate_limit { |
375 | my $self = shift; |
376 | if ($_[3] == -1) { |
377 | return $_[1].$self->_order_by($_[2]); |
378 | } else { |
379 | return $self->SUPER::_emulate_limit(@_); |
380 | } |
381 | } |
382 | |
383 | sub _recurse_fields { |
384 | my ($self, $fields, $params) = @_; |
385 | my $ref = ref $fields; |
386 | return $self->_quote($fields) unless $ref; |
387 | return $$fields if $ref eq 'SCALAR'; |
388 | |
389 | if ($ref eq 'ARRAY') { |
390 | return join(', ', map { |
391 | $self->_recurse_fields($_) |
392 | .(exists $self->{rownum_hack_count} && !($params && $params->{no_rownum_hack}) |
393 | ? ' AS col'.$self->{rownum_hack_count}++ |
394 | : '') |
395 | } @$fields); |
83e09b5b |
396 | } |
397 | elsif ($ref eq 'HASH') { |
398 | my %hash = %$fields; |
399 | my ($select, $as); |
400 | |
401 | if ($hash{-select}) { |
402 | $select = $self->_recurse_fields (delete $hash{-select}); |
403 | $as = $self->_quote (delete $hash{-as}); |
404 | } |
405 | else { |
406 | my ($func, $args) = each %hash; |
407 | delete $hash{$func}; |
408 | |
409 | if (lc ($func) eq 'distinct' && ref $args eq 'ARRAY' && @$args > 1) { |
410 | croak ( |
411 | 'The select => { distinct => ... } syntax is not supported for multiple columns.' |
412 | .' Instead please use { group_by => [ qw/' . (join ' ', @$args) . '/ ] }' |
413 | .' or { select => [ qw/' . (join ' ', @$args) . '/ ], distinct => 1 }' |
414 | ); |
db56cf3d |
415 | } |
83e09b5b |
416 | $select = sprintf ('%s( %s )', |
417 | $self->_sqlcase($func), |
418 | $self->_recurse_fields($args) |
419 | ); |
6f4ddea1 |
420 | } |
83e09b5b |
421 | |
422 | # there should be nothing left |
423 | if (keys %hash) { |
424 | croak "Malformed select argument - too many keys in hash: " . join (',', keys %$fields ); |
6f4ddea1 |
425 | } |
83e09b5b |
426 | |
427 | $select .= " AS $as" if $as; |
428 | return $select; |
6f4ddea1 |
429 | } |
430 | # Is the second check absolutely necessary? |
431 | elsif ( $ref eq 'REF' and ref($$fields) eq 'ARRAY' ) { |
db56cf3d |
432 | return $self->_fold_sqlbind( $fields ); |
6f4ddea1 |
433 | } |
434 | else { |
e8fcf76f |
435 | croak($ref . qq{ unexpected in _recurse_fields()}) |
6f4ddea1 |
436 | } |
437 | } |
438 | |
439 | sub _order_by { |
1cbd3034 |
440 | my ($self, $arg) = @_; |
15827712 |
441 | |
1cbd3034 |
442 | if (ref $arg eq 'HASH' and keys %$arg and not grep { $_ =~ /^-(?:desc|asc)/i } keys %$arg ) { |
443 | |
444 | my $ret = ''; |
445 | |
83e09b5b |
446 | if (my $g = $self->_recurse_fields($arg->{group_by}, { no_rownum_hack => 1 }) ) { |
447 | $ret = $self->_sqlcase(' group by ') . $g; |
6f4ddea1 |
448 | } |
15827712 |
449 | |
1cbd3034 |
450 | if (defined $arg->{having}) { |
451 | my ($frag, @bind) = $self->_recurse_where($arg->{having}); |
452 | push(@{$self->{having_bind}}, @bind); |
6f4ddea1 |
453 | $ret .= $self->_sqlcase(' having ').$frag; |
454 | } |
15827712 |
455 | |
1cbd3034 |
456 | if (defined $arg->{order_by}) { |
457 | my ($frag, @bind) = $self->SUPER::_order_by($arg->{order_by}); |
458 | push(@{$self->{order_bind}}, @bind); |
459 | $ret .= $frag; |
6f4ddea1 |
460 | } |
15827712 |
461 | |
1cbd3034 |
462 | return $ret; |
fde3719a |
463 | } |
1cbd3034 |
464 | else { |
465 | my ($sql, @bind) = $self->SUPER::_order_by ($arg); |
466 | push(@{$self->{order_bind}}, @bind); |
467 | return $sql; |
fd4cb60a |
468 | } |
6f4ddea1 |
469 | } |
470 | |
1cbd3034 |
471 | sub _order_directions { |
fd4cb60a |
472 | my ($self, $order) = @_; |
15827712 |
473 | |
1cbd3034 |
474 | # strip bind values - none of the current _order_directions users support them |
475 | return $self->SUPER::_order_directions( [ map |
476 | { ref $_ ? $_->[0] : $_ } |
477 | $self->_order_by_chunks ($order) |
478 | ]); |
fd4cb60a |
479 | } |
480 | |
6f4ddea1 |
481 | sub _table { |
482 | my ($self, $from) = @_; |
483 | if (ref $from eq 'ARRAY') { |
484 | return $self->_recurse_from(@$from); |
485 | } elsif (ref $from eq 'HASH') { |
486 | return $self->_make_as($from); |
487 | } else { |
488 | return $from; # would love to quote here but _table ends up getting called |
489 | # twice during an ->select without a limit clause due to |
490 | # the way S::A::Limit->select works. should maybe consider |
491 | # bypassing this and doing S::A::select($self, ...) in |
492 | # our select method above. meantime, quoting shims have |
493 | # been added to select/insert/update/delete here |
494 | } |
495 | } |
496 | |
497 | sub _recurse_from { |
498 | my ($self, $from, @join) = @_; |
499 | my @sqlf; |
500 | push(@sqlf, $self->_make_as($from)); |
501 | foreach my $j (@join) { |
502 | my ($to, $on) = @$j; |
503 | |
504 | # check whether a join type exists |
505 | my $join_clause = ''; |
506 | my $to_jt = ref($to) eq 'ARRAY' ? $to->[0] : $to; |
507 | if (ref($to_jt) eq 'HASH' and exists($to_jt->{-join_type})) { |
508 | $join_clause = ' '.uc($to_jt->{-join_type}).' JOIN '; |
509 | } else { |
510 | $join_clause = ' JOIN '; |
511 | } |
512 | push(@sqlf, $join_clause); |
513 | |
514 | if (ref $to eq 'ARRAY') { |
515 | push(@sqlf, '(', $self->_recurse_from(@$to), ')'); |
516 | } else { |
517 | push(@sqlf, $self->_make_as($to)); |
518 | } |
519 | push(@sqlf, ' ON ', $self->_join_condition($on)); |
520 | } |
521 | return join('', @sqlf); |
522 | } |
523 | |
db56cf3d |
524 | sub _fold_sqlbind { |
525 | my ($self, $sqlbind) = @_; |
69989ea9 |
526 | |
527 | my @sqlbind = @$$sqlbind; # copy |
528 | my $sql = shift @sqlbind; |
529 | push @{$self->{from_bind}}, @sqlbind; |
530 | |
db56cf3d |
531 | return $sql; |
6f4ddea1 |
532 | } |
533 | |
534 | sub _make_as { |
535 | my ($self, $from) = @_; |
db56cf3d |
536 | return join(' ', map { (ref $_ eq 'SCALAR' ? $$_ |
537 | : ref $_ eq 'REF' ? $self->_fold_sqlbind($_) |
538 | : $self->_quote($_)) |
6f4ddea1 |
539 | } reverse each %{$self->_skip_options($from)}); |
540 | } |
541 | |
542 | sub _skip_options { |
543 | my ($self, $hash) = @_; |
544 | my $clean_hash = {}; |
545 | $clean_hash->{$_} = $hash->{$_} |
546 | for grep {!/^-/} keys %$hash; |
547 | return $clean_hash; |
548 | } |
549 | |
550 | sub _join_condition { |
551 | my ($self, $cond) = @_; |
552 | if (ref $cond eq 'HASH') { |
553 | my %j; |
554 | for (keys %$cond) { |
555 | my $v = $cond->{$_}; |
556 | if (ref $v) { |
e8fcf76f |
557 | croak (ref($v) . qq{ reference arguments are not supported in JOINS - try using \"..." instead'}) |
6f4ddea1 |
558 | if ref($v) ne 'SCALAR'; |
559 | $j{$_} = $v; |
560 | } |
561 | else { |
562 | my $x = '= '.$self->_quote($v); $j{$_} = \$x; |
563 | } |
564 | }; |
565 | return scalar($self->_recurse_where(\%j)); |
566 | } elsif (ref $cond eq 'ARRAY') { |
567 | return join(' OR ', map { $self->_join_condition($_) } @$cond); |
568 | } else { |
569 | die "Can't handle this yet!"; |
570 | } |
571 | } |
572 | |
573 | sub _quote { |
574 | my ($self, $label) = @_; |
575 | return '' unless defined $label; |
576 | return "*" if $label eq '*'; |
577 | return $label unless $self->{quote_char}; |
578 | if(ref $self->{quote_char} eq "ARRAY"){ |
579 | return $self->{quote_char}->[0] . $label . $self->{quote_char}->[1] |
580 | if !defined $self->{name_sep}; |
581 | my $sep = $self->{name_sep}; |
582 | return join($self->{name_sep}, |
583 | map { $self->{quote_char}->[0] . $_ . $self->{quote_char}->[1] } |
584 | split(/\Q$sep\E/,$label)); |
585 | } |
586 | return $self->SUPER::_quote($label); |
587 | } |
588 | |
589 | sub limit_dialect { |
590 | my $self = shift; |
591 | $self->{limit_dialect} = shift if @_; |
592 | return $self->{limit_dialect}; |
593 | } |
594 | |
595 | sub quote_char { |
596 | my $self = shift; |
597 | $self->{quote_char} = shift if @_; |
598 | return $self->{quote_char}; |
599 | } |
600 | |
601 | sub name_sep { |
602 | my $self = shift; |
603 | $self->{name_sep} = shift if @_; |
604 | return $self->{name_sep}; |
605 | } |
606 | |
607 | 1; |
608 | |
609 | __END__ |
610 | |
611 | =pod |
612 | |
613 | =head1 NAME |
614 | |
855c6fd0 |
615 | DBIx::Class::SQLAHacks - This module is a subclass of SQL::Abstract::Limit |
616 | and includes a number of DBIC-specific workarounds, not yet suitable for |
617 | inclusion into SQLA proper. |
6f4ddea1 |
618 | |
619 | =head1 METHODS |
620 | |
621 | =head2 new |
622 | |
623 | Tries to determine limit dialect. |
624 | |
625 | =head2 select |
626 | |
627 | Quotes table names, handles "limit" dialects (e.g. where rownum between x and |
628 | y), supports SELECT ... FOR UPDATE and SELECT ... FOR SHARE. |
629 | |
630 | =head2 insert update delete |
631 | |
632 | Just quotes table names. |
633 | |
634 | =head2 limit_dialect |
635 | |
636 | Specifies the dialect of used for implementing an SQL "limit" clause for |
637 | restricting the number of query results returned. Valid values are: RowNum. |
638 | |
639 | See L<DBIx::Class::Storage::DBI/connect_info> for details. |
640 | |
641 | =head2 name_sep |
642 | |
643 | Character separating quoted table names. |
644 | |
645 | See L<DBIx::Class::Storage::DBI/connect_info> for details. |
646 | |
647 | =head2 quote_char |
648 | |
649 | Set to an array-ref to specify separate left and right quotes for table names. |
650 | |
651 | See L<DBIx::Class::Storage::DBI/connect_info> for details. |
652 | |
653 | =cut |
654 | |