Commit | Line | Data |
6f4ddea1 |
1 | package # Hide from PAUSE |
855c6fd0 |
2 | DBIx::Class::SQLAHacks; |
6f4ddea1 |
3 | |
998373c2 |
4 | # This module is a subclass of SQL::Abstract::Limit and includes a number |
5 | # of DBIC-specific workarounds, not yet suitable for inclusion into the |
6 | # SQLA core |
7 | |
6f4ddea1 |
8 | use base qw/SQL::Abstract::Limit/; |
e3764383 |
9 | use strict; |
10 | use warnings; |
b2b22cd6 |
11 | use Carp::Clan qw/^DBIx::Class|^SQL::Abstract/; |
8637bb24 |
12 | use Sub::Name(); |
b2b22cd6 |
13 | |
14 | BEGIN { |
15 | # reinstall the carp()/croak() functions imported into SQL::Abstract |
16 | # as Carp and Carp::Clan do not like each other much |
17 | no warnings qw/redefine/; |
18 | no strict qw/refs/; |
19 | for my $f (qw/carp croak/) { |
329d7385 |
20 | |
b2b22cd6 |
21 | my $orig = \&{"SQL::Abstract::$f"}; |
8637bb24 |
22 | *{"SQL::Abstract::$f"} = Sub::Name::subname "SQL::Abstract::$f" => |
23 | sub { |
24 | if (Carp::longmess() =~ /DBIx::Class::SQLAHacks::[\w]+ .+? called \s at/x) { |
25 | __PACKAGE__->can($f)->(@_); |
26 | } |
27 | else { |
28 | goto $orig; |
29 | } |
30 | }; |
b2b22cd6 |
31 | } |
32 | } |
6f4ddea1 |
33 | |
998373c2 |
34 | |
35 | # Tries to determine limit dialect. |
36 | # |
6f4ddea1 |
37 | sub new { |
38 | my $self = shift->SUPER::new(@_); |
39 | |
40 | # This prevents the caching of $dbh in S::A::L, I believe |
41 | # If limit_dialect is a ref (like a $dbh), go ahead and replace |
42 | # it with what it resolves to: |
43 | $self->{limit_dialect} = $self->_find_syntax($self->{limit_dialect}) |
44 | if ref $self->{limit_dialect}; |
45 | |
46 | $self; |
47 | } |
48 | |
81446c4f |
49 | # generate inner/outer select lists for various limit dialects |
50 | # which result in one or more subqueries (e.g. RNO, Top, RowNum) |
51 | # Any non-root-table columns need to have their table qualifier |
52 | # turned into a column name (otherwise names in subqueries clash |
53 | # and/or lose their source table) |
54 | sub _subqueried_selection { |
55 | my ($self, $rs_attrs) = @_; |
56 | |
57 | croak 'Limit usable only in the context of DBIC (missing $rs_attrs)' unless $rs_attrs; |
58 | |
59 | # correlate select and as |
60 | my @sel; |
61 | for my $i (0 .. $#{$rs_attrs->{select}}) { |
62 | my $s = $rs_attrs->{select}[$i]; |
63 | push @sel, { |
64 | sql => $self->_recurse_fields ($s), |
65 | unquoted_sql => do { local $self->{quote_char}; $self->_recurse_fields ($s) }, |
66 | as => |
67 | ( (ref $s) eq 'HASH' ? $s->{-as} : undef) |
68 | || |
69 | $rs_attrs->{as}[$i] |
70 | || |
71 | croak "Select argument $i ($s) without corresponding 'as'" |
72 | , |
73 | }; |
74 | } |
75 | |
76 | my ($qsep, $qalias) = map { quotemeta $_ } ( |
77 | $self->name_sep || '.', |
78 | $rs_attrs->{alias}, |
79 | ); |
80 | |
81 | # re-alias and remove any name separators from aliases, |
82 | # unless we are dealing with the current source alias |
83 | # (which will transcend the subqueries and is necessary |
84 | # for possible further chaining) |
85 | my (@insel, @outsel); |
86 | for my $node (@sel) { |
87 | if (List::Util::first { $_ =~ / (?<! $qalias ) $qsep /x } ($node->{as}, $node->{unquoted_sql}) ) { |
88 | $node->{as} =~ s/ $qsep /__/xg; |
89 | push @insel, sprintf '%s AS %s', $node->{sql}, $self->_quote($node->{as}); |
90 | push @outsel, $self->_quote ($node->{as}); |
91 | } |
92 | else { |
93 | push @insel, $node->{sql}; |
94 | push @outsel, $self->_quote ($node->{as}); |
95 | } |
96 | } |
97 | |
98 | return map { join (', ', @$_ ) } (\@insel, \@outsel); |
99 | } |
100 | |
6f4ddea1 |
101 | |
6553ac38 |
102 | # ANSI standard Limit/Offset implementation. DB2 and MSSQL use this |
6f4ddea1 |
103 | sub _RowNumberOver { |
a6b68a60 |
104 | my ($self, $sql, $rs_attrs, $rows, $offset ) = @_; |
6f4ddea1 |
105 | |
81446c4f |
106 | # mangle the input sql as we will be replacing the selector |
107 | $sql =~ s/^ \s* SELECT \s+ .+? \s+ (?= \b FROM \b )//ix |
cb478051 |
108 | or croak "Unrecognizable SELECT: $sql"; |
109 | |
81446c4f |
110 | # get selectors |
111 | my ($insel, $outsel) = $self->_subqueried_selection ($rs_attrs); |
112 | |
a6b68a60 |
113 | # make up an order if none exists |
6553ac38 |
114 | my $order_by = $self->_order_by( |
a6b68a60 |
115 | (delete $rs_attrs->{order_by}) || $self->_rno_default_order |
6553ac38 |
116 | ); |
6f4ddea1 |
117 | |
81446c4f |
118 | # whatever is left of the order_by (only where is processed at this point) |
a6b68a60 |
119 | my $group_having = $self->_parse_rs_attrs($rs_attrs); |
6f4ddea1 |
120 | |
a6b68a60 |
121 | my $qalias = $self->_quote ($rs_attrs->{alias}); |
1f36ab67 |
122 | |
81446c4f |
123 | my $idx_name = $self->_quote ('rno__row__index'); |
124 | |
cb478051 |
125 | $sql = sprintf (<<EOS, $offset + 1, $offset + $rows, ); |
6f4ddea1 |
126 | |
81446c4f |
127 | SELECT $outsel FROM ( |
128 | SELECT $outsel, ROW_NUMBER() OVER($order_by ) AS $idx_name FROM ( |
129 | SELECT $insel ${sql}${group_having} |
cb478051 |
130 | ) $qalias |
81446c4f |
131 | ) $qalias WHERE $idx_name BETWEEN %d AND %d |
6553ac38 |
132 | |
133 | EOS |
134 | |
135 | $sql =~ s/\s*\n\s*/ /g; # easier to read in the debugger |
6f4ddea1 |
136 | return $sql; |
137 | } |
138 | |
84ddb3da |
139 | # some databases are happy with OVER (), some need OVER (ORDER BY (SELECT (1)) ) |
140 | sub _rno_default_order { |
141 | return undef; |
142 | } |
143 | |
193590c2 |
144 | # Informix specific limit, almost like LIMIT/OFFSET |
145 | sub _SkipFirst { |
a6b68a60 |
146 | my ($self, $sql, $rs_attrs, $rows, $offset) = @_; |
193590c2 |
147 | |
148 | $sql =~ s/^ \s* SELECT \s+ //ix |
149 | or croak "Unrecognizable SELECT: $sql"; |
150 | |
151 | return sprintf ('SELECT %s%s%s%s', |
152 | $offset |
153 | ? sprintf ('SKIP %d ', $offset) |
154 | : '' |
155 | , |
156 | sprintf ('FIRST %d ', $rows), |
157 | $sql, |
a6b68a60 |
158 | $self->_parse_rs_attrs ($rs_attrs), |
193590c2 |
159 | ); |
160 | } |
161 | |
145b2a3d |
162 | # Firebird specific limit, reverse of _SkipFirst for Informix |
163 | sub _FirstSkip { |
a6b68a60 |
164 | my ($self, $sql, $rs_attrs, $rows, $offset) = @_; |
145b2a3d |
165 | |
166 | $sql =~ s/^ \s* SELECT \s+ //ix |
167 | or croak "Unrecognizable SELECT: $sql"; |
168 | |
169 | return sprintf ('SELECT %s%s%s%s', |
170 | sprintf ('FIRST %d ', $rows), |
171 | $offset |
172 | ? sprintf ('SKIP %d ', $offset) |
173 | : '' |
174 | , |
175 | $sql, |
a6b68a60 |
176 | $self->_parse_rs_attrs ($rs_attrs), |
145b2a3d |
177 | ); |
178 | } |
179 | |
81446c4f |
180 | # WhOracle limits |
181 | sub _RowNum { |
182 | my ( $self, $sql, $rs_attrs, $rows, $offset ) = @_; |
183 | |
184 | # mangle the input sql as we will be replacing the selector |
185 | $sql =~ s/^ \s* SELECT \s+ .+? \s+ (?= \b FROM \b )//ix |
186 | or croak "Unrecognizable SELECT: $sql"; |
187 | |
188 | my ($insel, $outsel) = $self->_subqueried_selection ($rs_attrs); |
189 | |
190 | my $qalias = $self->_quote ($rs_attrs->{alias}); |
191 | my $idx_name = $self->_quote ('rownum__index'); |
192 | my $order_group_having = $self->_parse_rs_attrs($rs_attrs); |
193 | |
194 | $sql = sprintf (<<EOS, $offset + 1, $offset + $rows, ); |
195 | |
196 | SELECT $outsel FROM ( |
197 | SELECT $outsel, ROWNUM $idx_name FROM ( |
198 | SELECT $insel ${sql}${order_group_having} |
199 | ) $qalias |
200 | ) $qalias WHERE $idx_name BETWEEN %d AND %d |
201 | |
202 | EOS |
203 | |
204 | $sql =~ s/\s*\n\s*/ /g; # easier to read in the debugger |
205 | return $sql; |
206 | } |
207 | |
208 | =begin |
6553ac38 |
209 | # Crappy Top based Limit/Offset support. Legacy from MSSQL. |
15827712 |
210 | sub _Top { |
a6b68a60 |
211 | my ( $self, $sql, $rs_attrs, $rows, $offset ) = @_; |
15827712 |
212 | |
81446c4f |
213 | # mangle the input sql as we will be replacing the selector |
214 | $sql =~ s/^ \s* SELECT \s+ .+? \s+ (?= \b FROM \b )//ix |
b1e1d073 |
215 | or croak "Unrecognizable SELECT: $sql"; |
b1e1d073 |
216 | |
81446c4f |
217 | # get selectors |
218 | my ($insel, $outsel) = $self->_subqueried_selection ($rs_attrs); |
219 | |
220 | # deal with order |
221 | my $rs_alias = $rs_attrs->{alias}; |
222 | my $req_order = delete $rs_attrs->{order_by}; |
42e5b103 |
223 | my $name_sep = $self->name_sep || '.'; |
81446c4f |
224 | |
225 | # examine normalized version, collapses nesting |
226 | my $limit_order = scalar $self->_order_by_chunks ($req_order) |
227 | ? $req_order |
228 | : [ map |
229 | { join ('', $rs_alias, $name_sep, $_ ) } |
230 | ( $rs_attrs->{_rsroot_source_handle}->resolve->primary_columns ) |
231 | ] |
232 | ; |
233 | |
234 | my ( $order_by_inner, $order_by_outer ) = $self->_order_directions($limit_order); |
235 | my $order_by_requested = $self->_order_by ($req_order); |
236 | |
237 | |
238 | |
239 | |
ac93965c |
240 | my $esc_name_sep = "\Q$name_sep\E"; |
241 | my $col_re = qr/ ^ (?: (.+) $esc_name_sep )? ([^$esc_name_sep]+) $ /x; |
242 | |
ac93965c |
243 | my $quoted_rs_alias = $self->_quote ($rs_alias); |
b1e1d073 |
244 | |
42e5b103 |
245 | # construct the new select lists, rename(alias) some columns if necessary |
246 | my (@outer_select, @inner_select, %seen_names, %col_aliases, %outer_col_aliases); |
b1e1d073 |
247 | |
a6b68a60 |
248 | for (@{$rs_attrs->{select}}) { |
42e5b103 |
249 | next if ref $_; |
250 | my ($table, $orig_colname) = ( $_ =~ $col_re ); |
251 | next unless $table; |
252 | $seen_names{$orig_colname}++; |
253 | } |
b1e1d073 |
254 | |
42e5b103 |
255 | for my $i (0 .. $#sql_select) { |
b1e1d073 |
256 | |
a6b68a60 |
257 | my $colsel_arg = $rs_attrs->{select}[$i]; |
42e5b103 |
258 | my $colsel_sql = $sql_select[$i]; |
b1e1d073 |
259 | |
42e5b103 |
260 | # this may or may not work (in case of a scalarref or something) |
261 | my ($table, $orig_colname) = ( $colsel_arg =~ $col_re ); |
b1e1d073 |
262 | |
42e5b103 |
263 | my $quoted_alias; |
264 | # do not attempt to understand non-scalar selects - alias numerically |
265 | if (ref $colsel_arg) { |
266 | $quoted_alias = $self->_quote ('column_' . (@inner_select + 1) ); |
267 | } |
268 | # column name seen more than once - alias it |
ed4cdb4f |
269 | elsif ($orig_colname && |
270 | ($seen_names{$orig_colname} && $seen_names{$orig_colname} > 1) ) { |
42e5b103 |
271 | $quoted_alias = $self->_quote ("${table}__${orig_colname}"); |
272 | } |
b1e1d073 |
273 | |
42e5b103 |
274 | # we did rename - make a record and adjust |
275 | if ($quoted_alias) { |
276 | # alias inner |
277 | push @inner_select, "$colsel_sql AS $quoted_alias"; |
278 | |
279 | # push alias to outer |
280 | push @outer_select, $quoted_alias; |
281 | |
282 | # Any aliasing accumulated here will be considered |
283 | # both for inner and outer adjustments of ORDER BY |
284 | $self->__record_alias ( |
285 | \%col_aliases, |
286 | $quoted_alias, |
287 | $colsel_arg, |
288 | $table ? $orig_colname : undef, |
289 | ); |
b1e1d073 |
290 | } |
291 | |
42e5b103 |
292 | # otherwise just leave things intact inside, and use the abbreviated one outside |
293 | # (as we do not have table names anymore) |
294 | else { |
295 | push @inner_select, $colsel_sql; |
296 | |
297 | my $outer_quoted = $self->_quote ($orig_colname); # it was not a duplicate so should just work |
298 | push @outer_select, $outer_quoted; |
299 | $self->__record_alias ( |
300 | \%outer_col_aliases, |
301 | $outer_quoted, |
302 | $colsel_arg, |
303 | $table ? $orig_colname : undef, |
304 | ); |
305 | } |
b1e1d073 |
306 | } |
307 | |
308 | my $outer_select = join (', ', @outer_select ); |
42e5b103 |
309 | my $inner_select = join (', ', @inner_select ); |
b1e1d073 |
310 | |
42e5b103 |
311 | %outer_col_aliases = (%outer_col_aliases, %col_aliases); |
b1e1d073 |
312 | |
15827712 |
313 | |
1cbd3034 |
314 | |
15827712 |
315 | |
64c7c000 |
316 | # generate the rest |
a6b68a60 |
317 | my $grpby_having = $self->_parse_rs_attrs ($rs_attrs); |
8f6dbee9 |
318 | |
64c7c000 |
319 | # short circuit for counts - the ordering complexity is needless |
a6b68a60 |
320 | if ($rs_attrs->{-for_count_only}) { |
64c7c000 |
321 | return "SELECT TOP $rows $inner_select $sql $grpby_having $order_by_outer"; |
322 | } |
323 | |
42e5b103 |
324 | # we can't really adjust the order_by columns, as introspection is lacking |
325 | # resort to simple substitution |
326 | for my $col (keys %outer_col_aliases) { |
327 | for ($order_by_requested, $order_by_outer) { |
328 | $_ =~ s/\s+$col\s+/ $outer_col_aliases{$col} /g; |
b1e1d073 |
329 | } |
330 | } |
42e5b103 |
331 | for my $col (keys %col_aliases) { |
9c1ffdde |
332 | $order_by_inner =~ s/\s+$col\s+/ $col_aliases{$col} /g; |
42e5b103 |
333 | } |
15827712 |
334 | |
15827712 |
335 | |
42e5b103 |
336 | my $inner_lim = $rows + $offset; |
15827712 |
337 | |
618a0fe3 |
338 | $sql = "SELECT TOP $inner_lim $inner_select $sql $grpby_having $order_by_inner"; |
42e5b103 |
339 | |
340 | if ($offset) { |
341 | $sql = <<"SQL"; |
b1e1d073 |
342 | |
343 | SELECT TOP $rows $outer_select FROM |
15827712 |
344 | ( |
42e5b103 |
345 | $sql |
ac93965c |
346 | ) $quoted_rs_alias |
15827712 |
347 | $order_by_outer |
b1e1d073 |
348 | SQL |
349 | |
42e5b103 |
350 | } |
15827712 |
351 | |
42e5b103 |
352 | if ($order_by_requested) { |
b1e1d073 |
353 | $sql = <<"SQL"; |
15827712 |
354 | |
42e5b103 |
355 | SELECT $outer_select FROM |
ac93965c |
356 | ( $sql ) $quoted_rs_alias |
357 | $order_by_requested |
15827712 |
358 | SQL |
b1e1d073 |
359 | |
360 | } |
361 | |
ac93965c |
362 | $sql =~ s/\s*\n\s*/ /g; # parsing out multiline statements is harder than a single line |
b1e1d073 |
363 | return $sql; |
15827712 |
364 | } |
81446c4f |
365 | =cut |
6f4ddea1 |
366 | |
367 | # While we're at it, this should make LIMIT queries more efficient, |
368 | # without digging into things too deeply |
6f4ddea1 |
369 | sub _find_syntax { |
370 | my ($self, $syntax) = @_; |
ac788c46 |
371 | return $self->{_cached_syntax} ||= $self->SUPER::_find_syntax($syntax); |
6f4ddea1 |
372 | } |
373 | |
998373c2 |
374 | # Quotes table names, handles "limit" dialects (e.g. where rownum between x and |
a6b68a60 |
375 | # y) |
6f4ddea1 |
376 | sub select { |
a6b68a60 |
377 | my ($self, $table, $fields, $where, $rs_attrs, @rest) = @_; |
1cbd3034 |
378 | |
379 | $self->{"${_}_bind"} = [] for (qw/having from order/); |
db56cf3d |
380 | |
c2b7c5dc |
381 | if (not ref($table) or ref($table) eq 'SCALAR') { |
6f4ddea1 |
382 | $table = $self->_quote($table); |
383 | } |
c2b7c5dc |
384 | |
6f4ddea1 |
385 | local $self->{rownum_hack_count} = 1 |
386 | if (defined $rest[0] && $self->{limit_dialect} eq 'RowNum'); |
387 | @rest = (-1) unless defined $rest[0]; |
e8fcf76f |
388 | croak "LIMIT 0 Does Not Compute" if $rest[0] == 0; |
6f4ddea1 |
389 | # and anyway, SQL::Abstract::Limit will cause a barf if we don't first |
a6b68a60 |
390 | |
db56cf3d |
391 | my ($sql, @where_bind) = $self->SUPER::select( |
a6b68a60 |
392 | $table, $self->_recurse_fields($fields), $where, $rs_attrs, @rest |
6f4ddea1 |
393 | ); |
1cbd3034 |
394 | return wantarray ? ($sql, @{$self->{from_bind}}, @where_bind, @{$self->{having_bind}}, @{$self->{order_bind}} ) : $sql; |
6f4ddea1 |
395 | } |
396 | |
998373c2 |
397 | # Quotes table names, and handles default inserts |
6f4ddea1 |
398 | sub insert { |
399 | my $self = shift; |
400 | my $table = shift; |
c2b7c5dc |
401 | $table = $self->_quote($table); |
7a72e5a5 |
402 | |
403 | # SQLA will emit INSERT INTO $table ( ) VALUES ( ) |
404 | # which is sadly understood only by MySQL. Change default behavior here, |
405 | # until SQLA2 comes with proper dialect support |
406 | if (! $_[0] or (ref $_[0] eq 'HASH' and !keys %{$_[0]} ) ) { |
28d28903 |
407 | my $sql = "INSERT INTO ${table} DEFAULT VALUES"; |
408 | |
ef8d02eb |
409 | if (my $ret = ($_[1]||{})->{returning} ) { |
410 | $sql .= $self->_insert_returning ($ret); |
28d28903 |
411 | } |
412 | |
413 | return $sql; |
7a72e5a5 |
414 | } |
415 | |
6f4ddea1 |
416 | $self->SUPER::insert($table, @_); |
417 | } |
418 | |
998373c2 |
419 | # Just quotes table names. |
6f4ddea1 |
420 | sub update { |
421 | my $self = shift; |
422 | my $table = shift; |
c2b7c5dc |
423 | $table = $self->_quote($table); |
6f4ddea1 |
424 | $self->SUPER::update($table, @_); |
425 | } |
426 | |
998373c2 |
427 | # Just quotes table names. |
6f4ddea1 |
428 | sub delete { |
429 | my $self = shift; |
430 | my $table = shift; |
c2b7c5dc |
431 | $table = $self->_quote($table); |
6f4ddea1 |
432 | $self->SUPER::delete($table, @_); |
433 | } |
434 | |
435 | sub _emulate_limit { |
436 | my $self = shift; |
a6b68a60 |
437 | # my ( $syntax, $sql, $order, $rows, $offset ) = @_; |
438 | |
6f4ddea1 |
439 | if ($_[3] == -1) { |
a6b68a60 |
440 | return $_[1] . $self->_parse_rs_attrs($_[2]); |
6f4ddea1 |
441 | } else { |
442 | return $self->SUPER::_emulate_limit(@_); |
443 | } |
444 | } |
445 | |
446 | sub _recurse_fields { |
81446c4f |
447 | my ($self, $fields) = @_; |
6f4ddea1 |
448 | my $ref = ref $fields; |
449 | return $self->_quote($fields) unless $ref; |
450 | return $$fields if $ref eq 'SCALAR'; |
451 | |
452 | if ($ref eq 'ARRAY') { |
81446c4f |
453 | return join(', ', map { $self->_recurse_fields($_) } @$fields); |
83e09b5b |
454 | } |
455 | elsif ($ref eq 'HASH') { |
81446c4f |
456 | my %hash = %$fields; # shallow copy |
83e09b5b |
457 | |
50136dd9 |
458 | my $as = delete $hash{-as}; # if supplied |
459 | |
81446c4f |
460 | my ($func, $args, @toomany) = %hash; |
461 | |
462 | # there should be only one pair |
463 | if (@toomany) { |
464 | croak "Malformed select argument - too many keys in hash: " . join (',', keys %$fields ); |
465 | } |
50136dd9 |
466 | |
467 | if (lc ($func) eq 'distinct' && ref $args eq 'ARRAY' && @$args > 1) { |
468 | croak ( |
469 | 'The select => { distinct => ... } syntax is not supported for multiple columns.' |
470 | .' Instead please use { group_by => [ qw/' . (join ' ', @$args) . '/ ] }' |
471 | .' or { select => [ qw/' . (join ' ', @$args) . '/ ], distinct => 1 }' |
83e09b5b |
472 | ); |
6f4ddea1 |
473 | } |
83e09b5b |
474 | |
50136dd9 |
475 | my $select = sprintf ('%s( %s )%s', |
476 | $self->_sqlcase($func), |
477 | $self->_recurse_fields($args), |
478 | $as |
0491b597 |
479 | ? sprintf (' %s %s', $self->_sqlcase('as'), $self->_quote ($as) ) |
50136dd9 |
480 | : '' |
481 | ); |
482 | |
83e09b5b |
483 | return $select; |
6f4ddea1 |
484 | } |
485 | # Is the second check absolutely necessary? |
486 | elsif ( $ref eq 'REF' and ref($$fields) eq 'ARRAY' ) { |
db56cf3d |
487 | return $self->_fold_sqlbind( $fields ); |
6f4ddea1 |
488 | } |
489 | else { |
e8fcf76f |
490 | croak($ref . qq{ unexpected in _recurse_fields()}) |
6f4ddea1 |
491 | } |
492 | } |
493 | |
a6b68a60 |
494 | my $for_syntax = { |
495 | update => 'FOR UPDATE', |
496 | shared => 'FOR SHARE', |
497 | }; |
498 | |
499 | # this used to be a part of _order_by but is broken out for clarity. |
500 | # What we have been doing forever is hijacking the $order arg of |
501 | # SQLA::select to pass in arbitrary pieces of data (first the group_by, |
502 | # then pretty much the entire resultset attr-hash, as more and more |
503 | # things in the SQLA space need to have mopre info about the $rs they |
504 | # create SQL for. The alternative would be to keep expanding the |
505 | # signature of _select with more and more positional parameters, which |
506 | # is just gross. All hail SQLA2! |
507 | sub _parse_rs_attrs { |
1cbd3034 |
508 | my ($self, $arg) = @_; |
15827712 |
509 | |
a6b68a60 |
510 | my $sql = ''; |
1cbd3034 |
511 | |
a6b68a60 |
512 | if (my $g = $self->_recurse_fields($arg->{group_by}, { no_rownum_hack => 1 }) ) { |
513 | $sql .= $self->_sqlcase(' group by ') . $g; |
514 | } |
1cbd3034 |
515 | |
a6b68a60 |
516 | if (defined $arg->{having}) { |
517 | my ($frag, @bind) = $self->_recurse_where($arg->{having}); |
518 | push(@{$self->{having_bind}}, @bind); |
519 | $sql .= $self->_sqlcase(' having ') . $frag; |
520 | } |
15827712 |
521 | |
a6b68a60 |
522 | if (defined $arg->{order_by}) { |
523 | $sql .= $self->_order_by ($arg->{order_by}); |
524 | } |
15827712 |
525 | |
a6b68a60 |
526 | if (my $for = $arg->{for}) { |
527 | $sql .= " $for_syntax->{$for}" if $for_syntax->{$for}; |
528 | } |
529 | |
530 | return $sql; |
531 | } |
532 | |
533 | sub _order_by { |
534 | my ($self, $arg) = @_; |
15827712 |
535 | |
a6b68a60 |
536 | # check that we are not called in legacy mode (order_by as 4th argument) |
537 | if (ref $arg eq 'HASH' and not grep { $_ =~ /^-(?:desc|asc)/i } keys %$arg ) { |
538 | return $self->_parse_rs_attrs ($arg); |
fde3719a |
539 | } |
1cbd3034 |
540 | else { |
541 | my ($sql, @bind) = $self->SUPER::_order_by ($arg); |
a6b68a60 |
542 | push @{$self->{order_bind}}, @bind; |
1cbd3034 |
543 | return $sql; |
fd4cb60a |
544 | } |
6f4ddea1 |
545 | } |
546 | |
1cbd3034 |
547 | sub _order_directions { |
fd4cb60a |
548 | my ($self, $order) = @_; |
15827712 |
549 | |
1cbd3034 |
550 | # strip bind values - none of the current _order_directions users support them |
551 | return $self->SUPER::_order_directions( [ map |
552 | { ref $_ ? $_->[0] : $_ } |
553 | $self->_order_by_chunks ($order) |
554 | ]); |
fd4cb60a |
555 | } |
556 | |
6f4ddea1 |
557 | sub _table { |
558 | my ($self, $from) = @_; |
559 | if (ref $from eq 'ARRAY') { |
560 | return $self->_recurse_from(@$from); |
561 | } elsif (ref $from eq 'HASH') { |
562 | return $self->_make_as($from); |
563 | } else { |
564 | return $from; # would love to quote here but _table ends up getting called |
565 | # twice during an ->select without a limit clause due to |
566 | # the way S::A::Limit->select works. should maybe consider |
567 | # bypassing this and doing S::A::select($self, ...) in |
568 | # our select method above. meantime, quoting shims have |
569 | # been added to select/insert/update/delete here |
570 | } |
571 | } |
572 | |
b8391c87 |
573 | sub _generate_join_clause { |
574 | my ($self, $join_type) = @_; |
575 | |
576 | return sprintf ('%s JOIN ', |
577 | $join_type ? ' ' . uc($join_type) : '' |
578 | ); |
579 | } |
580 | |
6f4ddea1 |
581 | sub _recurse_from { |
582 | my ($self, $from, @join) = @_; |
583 | my @sqlf; |
584 | push(@sqlf, $self->_make_as($from)); |
585 | foreach my $j (@join) { |
586 | my ($to, $on) = @$j; |
587 | |
aa82ce29 |
588 | |
6f4ddea1 |
589 | # check whether a join type exists |
6f4ddea1 |
590 | my $to_jt = ref($to) eq 'ARRAY' ? $to->[0] : $to; |
aa82ce29 |
591 | my $join_type; |
592 | if (ref($to_jt) eq 'HASH' and defined($to_jt->{-join_type})) { |
593 | $join_type = $to_jt->{-join_type}; |
594 | $join_type =~ s/^\s+ | \s+$//xg; |
6f4ddea1 |
595 | } |
aa82ce29 |
596 | |
de5f71ef |
597 | $join_type = $self->{_default_jointype} if not defined $join_type; |
aa82ce29 |
598 | |
b8391c87 |
599 | push @sqlf, $self->_generate_join_clause( $join_type ); |
6f4ddea1 |
600 | |
601 | if (ref $to eq 'ARRAY') { |
602 | push(@sqlf, '(', $self->_recurse_from(@$to), ')'); |
603 | } else { |
604 | push(@sqlf, $self->_make_as($to)); |
605 | } |
606 | push(@sqlf, ' ON ', $self->_join_condition($on)); |
607 | } |
608 | return join('', @sqlf); |
609 | } |
610 | |
db56cf3d |
611 | sub _fold_sqlbind { |
612 | my ($self, $sqlbind) = @_; |
69989ea9 |
613 | |
614 | my @sqlbind = @$$sqlbind; # copy |
615 | my $sql = shift @sqlbind; |
616 | push @{$self->{from_bind}}, @sqlbind; |
617 | |
db56cf3d |
618 | return $sql; |
6f4ddea1 |
619 | } |
620 | |
621 | sub _make_as { |
622 | my ($self, $from) = @_; |
db56cf3d |
623 | return join(' ', map { (ref $_ eq 'SCALAR' ? $$_ |
624 | : ref $_ eq 'REF' ? $self->_fold_sqlbind($_) |
625 | : $self->_quote($_)) |
6f4ddea1 |
626 | } reverse each %{$self->_skip_options($from)}); |
627 | } |
628 | |
629 | sub _skip_options { |
630 | my ($self, $hash) = @_; |
631 | my $clean_hash = {}; |
632 | $clean_hash->{$_} = $hash->{$_} |
633 | for grep {!/^-/} keys %$hash; |
634 | return $clean_hash; |
635 | } |
636 | |
637 | sub _join_condition { |
638 | my ($self, $cond) = @_; |
639 | if (ref $cond eq 'HASH') { |
640 | my %j; |
641 | for (keys %$cond) { |
642 | my $v = $cond->{$_}; |
643 | if (ref $v) { |
e8fcf76f |
644 | croak (ref($v) . qq{ reference arguments are not supported in JOINS - try using \"..." instead'}) |
6f4ddea1 |
645 | if ref($v) ne 'SCALAR'; |
646 | $j{$_} = $v; |
647 | } |
648 | else { |
649 | my $x = '= '.$self->_quote($v); $j{$_} = \$x; |
650 | } |
651 | }; |
652 | return scalar($self->_recurse_where(\%j)); |
653 | } elsif (ref $cond eq 'ARRAY') { |
654 | return join(' OR ', map { $self->_join_condition($_) } @$cond); |
655 | } else { |
656 | die "Can't handle this yet!"; |
657 | } |
658 | } |
659 | |
6f4ddea1 |
660 | sub limit_dialect { |
661 | my $self = shift; |
b2c7cf74 |
662 | if (@_) { |
663 | $self->{limit_dialect} = shift; |
664 | undef $self->{_cached_syntax}; |
665 | } |
6f4ddea1 |
666 | return $self->{limit_dialect}; |
667 | } |
668 | |
998373c2 |
669 | # Set to an array-ref to specify separate left and right quotes for table names. |
670 | # A single scalar is equivalen to [ $char, $char ] |
6f4ddea1 |
671 | sub quote_char { |
672 | my $self = shift; |
673 | $self->{quote_char} = shift if @_; |
674 | return $self->{quote_char}; |
675 | } |
676 | |
998373c2 |
677 | # Character separating quoted table names. |
6f4ddea1 |
678 | sub name_sep { |
679 | my $self = shift; |
680 | $self->{name_sep} = shift if @_; |
681 | return $self->{name_sep}; |
682 | } |
683 | |
684 | 1; |