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/) { |
15 | my $orig = \&{"SQL::Abstract::$f"}; |
16 | *{"SQL::Abstract::$f"} = sub { |
17 | |
18 | local $Carp::CarpLevel = 1; # even though Carp::Clan ignores this, $orig will not |
19 | |
20 | if (Carp::longmess() =~ /DBIx::Class::SQLAHacks::[\w]+\(\) called/) { |
21 | __PACKAGE__->can($f)->(@_); |
22 | } |
23 | else { |
24 | $orig->(@_); |
25 | } |
26 | } |
27 | } |
28 | } |
6f4ddea1 |
29 | |
30 | sub new { |
31 | my $self = shift->SUPER::new(@_); |
32 | |
33 | # This prevents the caching of $dbh in S::A::L, I believe |
34 | # If limit_dialect is a ref (like a $dbh), go ahead and replace |
35 | # it with what it resolves to: |
36 | $self->{limit_dialect} = $self->_find_syntax($self->{limit_dialect}) |
37 | if ref $self->{limit_dialect}; |
38 | |
39 | $self; |
40 | } |
41 | |
42 | |
6f4ddea1 |
43 | # Some databases (sqlite) do not handle multiple parenthesis |
44 | # around in/between arguments. A tentative x IN ( ( 1, 2 ,3) ) |
45 | # is interpreted as x IN 1 or something similar. |
46 | # |
47 | # Since we currently do not have access to the SQLA AST, resort |
48 | # to barbaric mutilation of any SQL supplied in literal form |
49 | |
50 | sub _strip_outer_paren { |
51 | my ($self, $arg) = @_; |
52 | |
53 | return $self->_SWITCH_refkind ($arg, { |
54 | ARRAYREFREF => sub { |
55 | $$arg->[0] = __strip_outer_paren ($$arg->[0]); |
56 | return $arg; |
57 | }, |
58 | SCALARREF => sub { |
59 | return \__strip_outer_paren( $$arg ); |
60 | }, |
61 | FALLBACK => sub { |
62 | return $arg |
63 | }, |
64 | }); |
65 | } |
66 | |
67 | sub __strip_outer_paren { |
68 | my $sql = shift; |
69 | |
70 | if ($sql and not ref $sql) { |
71 | while ($sql =~ /^ \s* \( (.*) \) \s* $/x ) { |
72 | $sql = $1; |
73 | } |
74 | } |
75 | |
76 | return $sql; |
77 | } |
78 | |
79 | sub _where_field_IN { |
80 | my ($self, $lhs, $op, $rhs) = @_; |
81 | $rhs = $self->_strip_outer_paren ($rhs); |
82 | return $self->SUPER::_where_field_IN ($lhs, $op, $rhs); |
83 | } |
84 | |
85 | sub _where_field_BETWEEN { |
86 | my ($self, $lhs, $op, $rhs) = @_; |
87 | $rhs = $self->_strip_outer_paren ($rhs); |
88 | return $self->SUPER::_where_field_BETWEEN ($lhs, $op, $rhs); |
89 | } |
90 | |
15827712 |
91 | # Slow but ANSI standard Limit/Offset support. DB2 uses this |
6f4ddea1 |
92 | sub _RowNumberOver { |
93 | my ($self, $sql, $order, $rows, $offset ) = @_; |
94 | |
95 | $offset += 1; |
03e1d9af |
96 | my $last = $rows + $offset - 1; |
6f4ddea1 |
97 | my ( $order_by ) = $self->_order_by( $order ); |
98 | |
99 | $sql = <<"SQL"; |
100 | SELECT * FROM |
101 | ( |
102 | SELECT Q1.*, ROW_NUMBER() OVER( ) AS ROW_NUM FROM ( |
103 | $sql |
104 | $order_by |
105 | ) Q1 |
106 | ) Q2 |
107 | WHERE ROW_NUM BETWEEN $offset AND $last |
108 | |
109 | SQL |
110 | |
111 | return $sql; |
112 | } |
113 | |
15827712 |
114 | # Crappy Top based Limit/Offset support. MSSQL uses this currently, |
115 | # but may have to switch to RowNumberOver one day |
116 | sub _Top { |
117 | my ( $self, $sql, $order, $rows, $offset ) = @_; |
118 | |
b1e1d073 |
119 | # mangle the input sql so it can be properly aliased in the outer queries |
120 | $sql =~ s/^ \s* SELECT \s+ (.+?) \s+ (?=FROM)//ix |
121 | or croak "Unrecognizable SELECT: $sql"; |
42e5b103 |
122 | my $sql_select = $1; |
123 | my @sql_select = split (/\s*,\s*/, $sql_select); |
124 | |
125 | # we can't support subqueries (in fact MSSQL can't) - croak |
126 | if (@sql_select != @{$self->{_dbic_rs_attrs}{select}}) { |
127 | croak (sprintf ( |
128 | 'SQL SELECT did not parse cleanly - retrieved %d comma separated elements, while ' |
129 | . 'the resultset select attribure contains %d elements: %s', |
130 | scalar @sql_select, |
131 | scalar @{$self->{_dbic_rs_attrs}{select}}, |
132 | $sql_select, |
133 | )); |
134 | } |
b1e1d073 |
135 | |
42e5b103 |
136 | my $name_sep = $self->name_sep || '.'; |
137 | $name_sep = "\Q$name_sep\E"; |
138 | my $col_re = qr/ ^ (?: (.+) $name_sep )? ([^$name_sep]+) $ /x; |
b1e1d073 |
139 | |
42e5b103 |
140 | # construct the new select lists, rename(alias) some columns if necessary |
141 | my (@outer_select, @inner_select, %seen_names, %col_aliases, %outer_col_aliases); |
b1e1d073 |
142 | |
42e5b103 |
143 | for (@{$self->{_dbic_rs_attrs}{select}}) { |
144 | next if ref $_; |
145 | my ($table, $orig_colname) = ( $_ =~ $col_re ); |
146 | next unless $table; |
147 | $seen_names{$orig_colname}++; |
148 | } |
b1e1d073 |
149 | |
42e5b103 |
150 | for my $i (0 .. $#sql_select) { |
b1e1d073 |
151 | |
42e5b103 |
152 | my $colsel_arg = $self->{_dbic_rs_attrs}{select}[$i]; |
153 | my $colsel_sql = $sql_select[$i]; |
b1e1d073 |
154 | |
42e5b103 |
155 | # this may or may not work (in case of a scalarref or something) |
156 | my ($table, $orig_colname) = ( $colsel_arg =~ $col_re ); |
b1e1d073 |
157 | |
42e5b103 |
158 | my $quoted_alias; |
159 | # do not attempt to understand non-scalar selects - alias numerically |
160 | if (ref $colsel_arg) { |
161 | $quoted_alias = $self->_quote ('column_' . (@inner_select + 1) ); |
162 | } |
163 | # column name seen more than once - alias it |
164 | elsif ($orig_colname && ($seen_names{$orig_colname} > 1) ) { |
165 | $quoted_alias = $self->_quote ("${table}__${orig_colname}"); |
166 | } |
b1e1d073 |
167 | |
42e5b103 |
168 | # we did rename - make a record and adjust |
169 | if ($quoted_alias) { |
170 | # alias inner |
171 | push @inner_select, "$colsel_sql AS $quoted_alias"; |
172 | |
173 | # push alias to outer |
174 | push @outer_select, $quoted_alias; |
175 | |
176 | # Any aliasing accumulated here will be considered |
177 | # both for inner and outer adjustments of ORDER BY |
178 | $self->__record_alias ( |
179 | \%col_aliases, |
180 | $quoted_alias, |
181 | $colsel_arg, |
182 | $table ? $orig_colname : undef, |
183 | ); |
b1e1d073 |
184 | } |
185 | |
42e5b103 |
186 | # otherwise just leave things intact inside, and use the abbreviated one outside |
187 | # (as we do not have table names anymore) |
188 | else { |
189 | push @inner_select, $colsel_sql; |
190 | |
191 | my $outer_quoted = $self->_quote ($orig_colname); # it was not a duplicate so should just work |
192 | push @outer_select, $outer_quoted; |
193 | $self->__record_alias ( |
194 | \%outer_col_aliases, |
195 | $outer_quoted, |
196 | $colsel_arg, |
197 | $table ? $orig_colname : undef, |
198 | ); |
199 | } |
b1e1d073 |
200 | } |
201 | |
202 | my $outer_select = join (', ', @outer_select ); |
42e5b103 |
203 | my $inner_select = join (', ', @inner_select ); |
b1e1d073 |
204 | |
42e5b103 |
205 | %outer_col_aliases = (%outer_col_aliases, %col_aliases); |
b1e1d073 |
206 | |
207 | # deal with order |
15827712 |
208 | croak '$order supplied to SQLAHacks limit emulators must be a hash' |
209 | if (ref $order ne 'HASH'); |
210 | |
8f6dbee9 |
211 | $order = { %$order }; #copy |
212 | |
02d133f0 |
213 | my $req_order = $order->{order_by}; |
214 | my $limit_order = |
215 | scalar $self->_order_by_chunks ($req_order) # exaime normalized version, collapses nesting |
216 | ? $req_order |
217 | : $order->{_virtual_order_by} |
218 | ; |
b1e1d073 |
219 | |
42e5b103 |
220 | my ( $order_by_inner, $order_by_outer ) = $self->_order_directions($limit_order); |
221 | my $order_by_requested = $self->_order_by ($req_order); |
15827712 |
222 | |
64c7c000 |
223 | # generate the rest |
224 | delete $order->{$_} for qw/order_by _virtual_order_by/; |
225 | my $grpby_having = $self->_order_by ($order); |
226 | |
227 | # short circuit for counts - the ordering complexity is needless |
228 | if ($self->{_dbic_rs_attrs}{-for_count_only}) { |
229 | return "SELECT TOP $rows $inner_select $sql $grpby_having $order_by_outer"; |
230 | } |
231 | |
42e5b103 |
232 | # we can't really adjust the order_by columns, as introspection is lacking |
233 | # resort to simple substitution |
234 | for my $col (keys %outer_col_aliases) { |
235 | for ($order_by_requested, $order_by_outer) { |
236 | $_ =~ s/\s+$col\s+/ $outer_col_aliases{$col} /g; |
b1e1d073 |
237 | } |
238 | } |
42e5b103 |
239 | for my $col (keys %col_aliases) { |
240 | $order_by_inner =~ s/\s+$col\s+/$col_aliases{$col}/g; |
241 | } |
1cbd3034 |
242 | |
02d133f0 |
243 | |
42e5b103 |
244 | my $inner_lim = $rows + $offset; |
15827712 |
245 | |
618a0fe3 |
246 | $sql = "SELECT TOP $inner_lim $inner_select $sql $grpby_having $order_by_inner"; |
42e5b103 |
247 | |
248 | if ($offset) { |
249 | $sql = <<"SQL"; |
b1e1d073 |
250 | |
251 | SELECT TOP $rows $outer_select FROM |
15827712 |
252 | ( |
42e5b103 |
253 | $sql |
02d133f0 |
254 | ) AS me |
15827712 |
255 | $order_by_outer |
b1e1d073 |
256 | SQL |
257 | |
42e5b103 |
258 | } |
15827712 |
259 | |
42e5b103 |
260 | if ($order_by_requested) { |
b1e1d073 |
261 | $sql = <<"SQL"; |
262 | |
42e5b103 |
263 | SELECT $outer_select FROM |
02d133f0 |
264 | ( $sql ) AS me |
42e5b103 |
265 | $order_by_requested; |
15827712 |
266 | SQL |
b1e1d073 |
267 | |
268 | } |
269 | |
270 | return $sql; |
15827712 |
271 | } |
272 | |
42e5b103 |
273 | # action at a distance to shorten Top code above |
274 | sub __record_alias { |
275 | my ($self, $register, $alias, $fqcol, $col) = @_; |
276 | |
277 | # record qualified name |
278 | $register->{$fqcol} = $alias; |
279 | $register->{$self->_quote($fqcol)} = $alias; |
280 | |
281 | return unless $col; |
282 | |
283 | # record unqialified name, undef (no adjustment) if a duplicate is found |
284 | if (exists $register->{$col}) { |
285 | $register->{$col} = undef; |
286 | } |
287 | else { |
288 | $register->{$col} = $alias; |
289 | } |
290 | |
291 | $register->{$self->_quote($col)} = $register->{$col}; |
292 | } |
293 | |
15827712 |
294 | |
6f4ddea1 |
295 | |
296 | # While we're at it, this should make LIMIT queries more efficient, |
297 | # without digging into things too deeply |
6f4ddea1 |
298 | sub _find_syntax { |
299 | my ($self, $syntax) = @_; |
ac788c46 |
300 | return $self->{_cached_syntax} ||= $self->SUPER::_find_syntax($syntax); |
6f4ddea1 |
301 | } |
302 | |
ec7cfd36 |
303 | my $for_syntax = { |
304 | update => 'FOR UPDATE', |
305 | shared => 'FOR SHARE', |
306 | }; |
6f4ddea1 |
307 | sub select { |
308 | my ($self, $table, $fields, $where, $order, @rest) = @_; |
1cbd3034 |
309 | |
310 | $self->{"${_}_bind"} = [] for (qw/having from order/); |
db56cf3d |
311 | |
6f4ddea1 |
312 | if (ref $table eq 'SCALAR') { |
313 | $table = $$table; |
314 | } |
315 | elsif (not ref $table) { |
316 | $table = $self->_quote($table); |
317 | } |
318 | local $self->{rownum_hack_count} = 1 |
319 | if (defined $rest[0] && $self->{limit_dialect} eq 'RowNum'); |
320 | @rest = (-1) unless defined $rest[0]; |
e8fcf76f |
321 | croak "LIMIT 0 Does Not Compute" if $rest[0] == 0; |
6f4ddea1 |
322 | # and anyway, SQL::Abstract::Limit will cause a barf if we don't first |
db56cf3d |
323 | my ($sql, @where_bind) = $self->SUPER::select( |
6f4ddea1 |
324 | $table, $self->_recurse_fields($fields), $where, $order, @rest |
325 | ); |
ec7cfd36 |
326 | if (my $for = delete $self->{_dbic_rs_attrs}{for}) { |
327 | $sql .= " $for_syntax->{$for}" if $for_syntax->{$for}; |
328 | } |
329 | |
1cbd3034 |
330 | return wantarray ? ($sql, @{$self->{from_bind}}, @where_bind, @{$self->{having_bind}}, @{$self->{order_bind}} ) : $sql; |
6f4ddea1 |
331 | } |
332 | |
333 | sub insert { |
334 | my $self = shift; |
335 | my $table = shift; |
336 | $table = $self->_quote($table) unless ref($table); |
7a72e5a5 |
337 | |
338 | # SQLA will emit INSERT INTO $table ( ) VALUES ( ) |
339 | # which is sadly understood only by MySQL. Change default behavior here, |
340 | # until SQLA2 comes with proper dialect support |
341 | if (! $_[0] or (ref $_[0] eq 'HASH' and !keys %{$_[0]} ) ) { |
342 | return "INSERT INTO ${table} DEFAULT VALUES" |
343 | } |
344 | |
6f4ddea1 |
345 | $self->SUPER::insert($table, @_); |
346 | } |
347 | |
348 | sub update { |
349 | my $self = shift; |
350 | my $table = shift; |
351 | $table = $self->_quote($table) unless ref($table); |
352 | $self->SUPER::update($table, @_); |
353 | } |
354 | |
355 | sub delete { |
356 | my $self = shift; |
357 | my $table = shift; |
358 | $table = $self->_quote($table) unless ref($table); |
359 | $self->SUPER::delete($table, @_); |
360 | } |
361 | |
362 | sub _emulate_limit { |
363 | my $self = shift; |
364 | if ($_[3] == -1) { |
365 | return $_[1].$self->_order_by($_[2]); |
366 | } else { |
367 | return $self->SUPER::_emulate_limit(@_); |
368 | } |
369 | } |
370 | |
371 | sub _recurse_fields { |
372 | my ($self, $fields, $params) = @_; |
373 | my $ref = ref $fields; |
374 | return $self->_quote($fields) unless $ref; |
375 | return $$fields if $ref eq 'SCALAR'; |
376 | |
377 | if ($ref eq 'ARRAY') { |
378 | return join(', ', map { |
379 | $self->_recurse_fields($_) |
380 | .(exists $self->{rownum_hack_count} && !($params && $params->{no_rownum_hack}) |
381 | ? ' AS col'.$self->{rownum_hack_count}++ |
382 | : '') |
383 | } @$fields); |
384 | } elsif ($ref eq 'HASH') { |
385 | foreach my $func (keys %$fields) { |
db56cf3d |
386 | if ($func eq 'distinct') { |
387 | my $_fields = $fields->{$func}; |
388 | if (ref $_fields eq 'ARRAY' && @{$_fields} > 1) { |
04ebc6f4 |
389 | croak ( |
390 | 'The select => { distinct => ... } syntax is not supported for multiple columns.' |
391 | .' Instead please use { group_by => [ qw/' . (join ' ', @$_fields) . '/ ] }' |
392 | .' or { select => [ qw/' . (join ' ', @$_fields) . '/ ], distinct => 1 }' |
393 | ); |
db56cf3d |
394 | } |
395 | else { |
396 | $_fields = @{$_fields}[0] if ref $_fields eq 'ARRAY'; |
04ebc6f4 |
397 | carp ( |
398 | 'The select => { distinct => ... } syntax will be deprecated in DBIC version 0.09,' |
399 | ." please use { group_by => '${_fields}' } or { select => '${_fields}', distinct => 1 }" |
400 | ); |
db56cf3d |
401 | } |
402 | } |
6f4ddea1 |
403 | return $self->_sqlcase($func) |
404 | .'( '.$self->_recurse_fields($fields->{$func}).' )'; |
405 | } |
406 | } |
407 | # Is the second check absolutely necessary? |
408 | elsif ( $ref eq 'REF' and ref($$fields) eq 'ARRAY' ) { |
db56cf3d |
409 | return $self->_fold_sqlbind( $fields ); |
6f4ddea1 |
410 | } |
411 | else { |
e8fcf76f |
412 | croak($ref . qq{ unexpected in _recurse_fields()}) |
6f4ddea1 |
413 | } |
414 | } |
415 | |
416 | sub _order_by { |
1cbd3034 |
417 | my ($self, $arg) = @_; |
15827712 |
418 | |
1cbd3034 |
419 | if (ref $arg eq 'HASH' and keys %$arg and not grep { $_ =~ /^-(?:desc|asc)/i } keys %$arg ) { |
420 | |
421 | my $ret = ''; |
422 | |
423 | if (defined $arg->{group_by}) { |
6f4ddea1 |
424 | $ret = $self->_sqlcase(' group by ') |
1cbd3034 |
425 | .$self->_recurse_fields($arg->{group_by}, { no_rownum_hack => 1 }); |
6f4ddea1 |
426 | } |
15827712 |
427 | |
1cbd3034 |
428 | if (defined $arg->{having}) { |
429 | my ($frag, @bind) = $self->_recurse_where($arg->{having}); |
430 | push(@{$self->{having_bind}}, @bind); |
6f4ddea1 |
431 | $ret .= $self->_sqlcase(' having ').$frag; |
432 | } |
15827712 |
433 | |
1cbd3034 |
434 | if (defined $arg->{order_by}) { |
435 | my ($frag, @bind) = $self->SUPER::_order_by($arg->{order_by}); |
436 | push(@{$self->{order_bind}}, @bind); |
437 | $ret .= $frag; |
6f4ddea1 |
438 | } |
15827712 |
439 | |
1cbd3034 |
440 | return $ret; |
fde3719a |
441 | } |
1cbd3034 |
442 | else { |
443 | my ($sql, @bind) = $self->SUPER::_order_by ($arg); |
444 | push(@{$self->{order_bind}}, @bind); |
445 | return $sql; |
fd4cb60a |
446 | } |
6f4ddea1 |
447 | } |
448 | |
1cbd3034 |
449 | sub _order_directions { |
fd4cb60a |
450 | my ($self, $order) = @_; |
15827712 |
451 | |
1cbd3034 |
452 | # strip bind values - none of the current _order_directions users support them |
453 | return $self->SUPER::_order_directions( [ map |
454 | { ref $_ ? $_->[0] : $_ } |
455 | $self->_order_by_chunks ($order) |
456 | ]); |
fd4cb60a |
457 | } |
458 | |
6f4ddea1 |
459 | sub _table { |
460 | my ($self, $from) = @_; |
461 | if (ref $from eq 'ARRAY') { |
462 | return $self->_recurse_from(@$from); |
463 | } elsif (ref $from eq 'HASH') { |
464 | return $self->_make_as($from); |
465 | } else { |
466 | return $from; # would love to quote here but _table ends up getting called |
467 | # twice during an ->select without a limit clause due to |
468 | # the way S::A::Limit->select works. should maybe consider |
469 | # bypassing this and doing S::A::select($self, ...) in |
470 | # our select method above. meantime, quoting shims have |
471 | # been added to select/insert/update/delete here |
472 | } |
473 | } |
474 | |
475 | sub _recurse_from { |
476 | my ($self, $from, @join) = @_; |
477 | my @sqlf; |
478 | push(@sqlf, $self->_make_as($from)); |
479 | foreach my $j (@join) { |
480 | my ($to, $on) = @$j; |
481 | |
482 | # check whether a join type exists |
483 | my $join_clause = ''; |
484 | my $to_jt = ref($to) eq 'ARRAY' ? $to->[0] : $to; |
485 | if (ref($to_jt) eq 'HASH' and exists($to_jt->{-join_type})) { |
486 | $join_clause = ' '.uc($to_jt->{-join_type}).' JOIN '; |
487 | } else { |
488 | $join_clause = ' JOIN '; |
489 | } |
490 | push(@sqlf, $join_clause); |
491 | |
492 | if (ref $to eq 'ARRAY') { |
493 | push(@sqlf, '(', $self->_recurse_from(@$to), ')'); |
494 | } else { |
495 | push(@sqlf, $self->_make_as($to)); |
496 | } |
497 | push(@sqlf, ' ON ', $self->_join_condition($on)); |
498 | } |
499 | return join('', @sqlf); |
500 | } |
501 | |
db56cf3d |
502 | sub _fold_sqlbind { |
503 | my ($self, $sqlbind) = @_; |
69989ea9 |
504 | |
505 | my @sqlbind = @$$sqlbind; # copy |
506 | my $sql = shift @sqlbind; |
507 | push @{$self->{from_bind}}, @sqlbind; |
508 | |
db56cf3d |
509 | return $sql; |
6f4ddea1 |
510 | } |
511 | |
512 | sub _make_as { |
513 | my ($self, $from) = @_; |
db56cf3d |
514 | return join(' ', map { (ref $_ eq 'SCALAR' ? $$_ |
515 | : ref $_ eq 'REF' ? $self->_fold_sqlbind($_) |
516 | : $self->_quote($_)) |
6f4ddea1 |
517 | } reverse each %{$self->_skip_options($from)}); |
518 | } |
519 | |
520 | sub _skip_options { |
521 | my ($self, $hash) = @_; |
522 | my $clean_hash = {}; |
523 | $clean_hash->{$_} = $hash->{$_} |
524 | for grep {!/^-/} keys %$hash; |
525 | return $clean_hash; |
526 | } |
527 | |
528 | sub _join_condition { |
529 | my ($self, $cond) = @_; |
530 | if (ref $cond eq 'HASH') { |
531 | my %j; |
532 | for (keys %$cond) { |
533 | my $v = $cond->{$_}; |
534 | if (ref $v) { |
e8fcf76f |
535 | croak (ref($v) . qq{ reference arguments are not supported in JOINS - try using \"..." instead'}) |
6f4ddea1 |
536 | if ref($v) ne 'SCALAR'; |
537 | $j{$_} = $v; |
538 | } |
539 | else { |
540 | my $x = '= '.$self->_quote($v); $j{$_} = \$x; |
541 | } |
542 | }; |
543 | return scalar($self->_recurse_where(\%j)); |
544 | } elsif (ref $cond eq 'ARRAY') { |
545 | return join(' OR ', map { $self->_join_condition($_) } @$cond); |
546 | } else { |
547 | die "Can't handle this yet!"; |
548 | } |
549 | } |
550 | |
551 | sub _quote { |
552 | my ($self, $label) = @_; |
553 | return '' unless defined $label; |
554 | return "*" if $label eq '*'; |
555 | return $label unless $self->{quote_char}; |
556 | if(ref $self->{quote_char} eq "ARRAY"){ |
557 | return $self->{quote_char}->[0] . $label . $self->{quote_char}->[1] |
558 | if !defined $self->{name_sep}; |
559 | my $sep = $self->{name_sep}; |
560 | return join($self->{name_sep}, |
561 | map { $self->{quote_char}->[0] . $_ . $self->{quote_char}->[1] } |
562 | split(/\Q$sep\E/,$label)); |
563 | } |
564 | return $self->SUPER::_quote($label); |
565 | } |
566 | |
567 | sub limit_dialect { |
568 | my $self = shift; |
569 | $self->{limit_dialect} = shift if @_; |
570 | return $self->{limit_dialect}; |
571 | } |
572 | |
573 | sub quote_char { |
574 | my $self = shift; |
575 | $self->{quote_char} = shift if @_; |
576 | return $self->{quote_char}; |
577 | } |
578 | |
579 | sub name_sep { |
580 | my $self = shift; |
581 | $self->{name_sep} = shift if @_; |
582 | return $self->{name_sep}; |
583 | } |
584 | |
585 | 1; |
586 | |
587 | __END__ |
588 | |
589 | =pod |
590 | |
591 | =head1 NAME |
592 | |
855c6fd0 |
593 | DBIx::Class::SQLAHacks - This module is a subclass of SQL::Abstract::Limit |
594 | and includes a number of DBIC-specific workarounds, not yet suitable for |
595 | inclusion into SQLA proper. |
6f4ddea1 |
596 | |
597 | =head1 METHODS |
598 | |
599 | =head2 new |
600 | |
601 | Tries to determine limit dialect. |
602 | |
603 | =head2 select |
604 | |
605 | Quotes table names, handles "limit" dialects (e.g. where rownum between x and |
606 | y), supports SELECT ... FOR UPDATE and SELECT ... FOR SHARE. |
607 | |
608 | =head2 insert update delete |
609 | |
610 | Just quotes table names. |
611 | |
612 | =head2 limit_dialect |
613 | |
614 | Specifies the dialect of used for implementing an SQL "limit" clause for |
615 | restricting the number of query results returned. Valid values are: RowNum. |
616 | |
617 | See L<DBIx::Class::Storage::DBI/connect_info> for details. |
618 | |
619 | =head2 name_sep |
620 | |
621 | Character separating quoted table names. |
622 | |
623 | See L<DBIx::Class::Storage::DBI/connect_info> for details. |
624 | |
625 | =head2 quote_char |
626 | |
627 | Set to an array-ref to specify separate left and right quotes for table names. |
628 | |
629 | See L<DBIx::Class::Storage::DBI/connect_info> for details. |
630 | |
631 | =cut |
632 | |