Commit | Line | Data |
f68f4d44 |
1 | package DBIx::Class::Storage::DBI::Sybase; |
2 | |
3 | use strict; |
4 | use warnings; |
2ad62d97 |
5 | |
eabab5d0 |
6 | use base qw/ |
d867eeda |
7 | DBIx::Class::Storage::DBI::Sybase::Common |
8 | DBIx::Class::Storage::DBI::AutoCast |
eabab5d0 |
9 | /; |
2ad62d97 |
10 | use mro 'c3'; |
d867eeda |
11 | use Carp::Clan qw/^DBIx::Class/; |
12 | use List::Util (); |
13 | use Sub::Name (); |
14 | |
15 | __PACKAGE__->mk_group_accessors('simple' => |
16 | qw/_identity _blob_log_on_update _writer_storage _is_writer_storage |
17 | _identity_method/ |
18 | ); |
19 | |
20 | my @also_proxy_to_writer_storage = qw/ |
2baff5da |
21 | connect_call_set_auto_cast auto_cast connect_call_blob_setup |
22 | connect_call_datetime_setup |
23 | |
d867eeda |
24 | disconnect _connect_info _sql_maker _sql_maker_opts disable_sth_caching |
25 | auto_savepoint unsafe cursor_class debug debugobj schema |
26 | /; |
27 | |
28 | =head1 NAME |
29 | |
30 | DBIx::Class::Storage::DBI::Sybase - Sybase support for DBIx::Class |
31 | |
32 | =head1 SYNOPSIS |
33 | |
34 | This subclass supports L<DBD::Sybase> for real Sybase databases. If you are |
35 | using an MSSQL database via L<DBD::Sybase>, your storage will be reblessed to |
36 | L<DBIx::Class::Storage::DBI::Sybase::Microsoft_SQL_Server>. |
37 | |
38 | =head1 DESCRIPTION |
39 | |
40 | If your version of Sybase does not support placeholders, then your storage |
41 | will be reblessed to L<DBIx::Class::Storage::DBI::Sybase::NoBindVars>. You can |
42 | also enable that driver explicitly, see the documentation for more details. |
43 | |
44 | With this driver there is unfortunately no way to get the C<last_insert_id> |
45 | without doing a C<SELECT MAX(col)>. This is done safely in a transaction |
46 | (locking the table.) See L</INSERTS WITH PLACEHOLDERS>. |
47 | |
48 | A recommended L<DBIx::Class::Storage::DBI/connect_info> setting: |
49 | |
50 | on_connect_call => [['datetime_setup'], ['blob_setup', log_on_update => 0]] |
51 | |
52 | =head1 METHODS |
53 | |
54 | =cut |
f68f4d44 |
55 | |
47d9646a |
56 | sub _rebless { |
d867eeda |
57 | my $self = shift; |
d29565e0 |
58 | |
d867eeda |
59 | if (ref($self) eq 'DBIx::Class::Storage::DBI::Sybase') { |
ef131d82 |
60 | my $dbtype = eval { |
d867eeda |
61 | @{$self->_get_dbh->selectrow_arrayref(qq{sp_server_info \@attribute_id=1})}[2] |
62 | } || ''; |
63 | |
64 | my $exception = $@; |
65 | $dbtype =~ s/\W/_/gi; |
66 | my $subclass = "DBIx::Class::Storage::DBI::Sybase::${dbtype}"; |
67 | |
68 | if (!$exception && $dbtype && $self->load_optional_class($subclass)) { |
69 | bless $self, $subclass; |
70 | $self->_rebless; |
71 | } else { # real Sybase |
72 | my $no_bind_vars = 'DBIx::Class::Storage::DBI::Sybase::NoBindVars'; |
73 | |
74 | if ($self->using_freetds) { |
75 | carp <<'EOF' unless $ENV{DBIC_SYBASE_FREETDS_NOWARN}; |
76 | |
77 | You are using FreeTDS with Sybase. |
78 | |
79 | We will do our best to support this configuration, but please consider this |
80 | support experimental. |
81 | |
82 | TEXT/IMAGE columns will definitely not work. |
83 | |
84 | You are encouraged to recompile DBD::Sybase with the Sybase Open Client libraries |
85 | instead. |
86 | |
87 | See perldoc DBIx::Class::Storage::DBI::Sybase for more details. |
88 | |
89 | To turn off this warning set the DBIC_SYBASE_FREETDS_NOWARN environment |
90 | variable. |
91 | EOF |
92 | if (not $self->_typeless_placeholders_supported) { |
93 | if ($self->_placeholders_supported) { |
94 | $self->auto_cast(1); |
95 | } else { |
96 | $self->ensure_class_loaded($no_bind_vars); |
97 | bless $self, $no_bind_vars; |
d29565e0 |
98 | $self->_rebless; |
d867eeda |
99 | } |
d29565e0 |
100 | } |
d867eeda |
101 | } |
102 | elsif (not $self->_get_dbh->{syb_dynamic_supported}) { |
103 | # not necessarily FreeTDS, but no placeholders nevertheless |
104 | $self->ensure_class_loaded($no_bind_vars); |
105 | bless $self, $no_bind_vars; |
106 | $self->_rebless; |
107 | } elsif (not $self->_typeless_placeholders_supported) { |
108 | # this is highly unlikely, but we check just in case |
109 | $self->auto_cast(1); |
110 | } |
111 | } |
112 | } |
113 | } |
114 | |
115 | sub _init { |
116 | my $self = shift; |
117 | $self->_set_max_connect(256); |
118 | |
119 | # based on LongReadLen in connect_info |
120 | $self->set_textsize if $self->using_freetds; |
121 | |
122 | # create storage for insert/(update blob) transactions, |
123 | # unless this is that storage |
124 | return if $self->_is_writer_storage; |
125 | |
126 | my $writer_storage = (ref $self)->new; |
127 | |
128 | $writer_storage->_is_writer_storage(1); |
129 | $writer_storage->connect_info($self->connect_info); |
2baff5da |
130 | $writer_storage->auto_cast($self->auto_cast); |
d867eeda |
131 | |
132 | $self->_writer_storage($writer_storage); |
133 | } |
134 | |
135 | for my $method (@also_proxy_to_writer_storage) { |
136 | no strict 'refs'; |
2baff5da |
137 | no warnings 'redefine'; |
d867eeda |
138 | |
139 | my $replaced = __PACKAGE__->can($method); |
140 | |
141 | *{$method} = Sub::Name::subname __PACKAGE__."::$method" => sub { |
142 | my $self = shift; |
143 | $self->_writer_storage->$replaced(@_) if $self->_writer_storage; |
144 | return $self->$replaced(@_); |
145 | }; |
146 | } |
147 | |
148 | # Make sure we have CHAINED mode turned on if AutoCommit is off in non-FreeTDS |
149 | # DBD::Sybase (since we don't know how DBD::Sybase was compiled.) If however |
150 | # we're using FreeTDS, CHAINED mode turns on an implicit transaction which we |
151 | # only want when AutoCommit is off. |
152 | sub _populate_dbh { |
153 | my $self = shift; |
154 | |
155 | $self->next::method(@_); |
156 | |
157 | if (not $self->using_freetds) { |
158 | $self->_dbh->{syb_chained_txn} = 1; |
159 | } else { |
160 | if ($self->_dbh_autocommit) { |
161 | $self->_dbh->do('SET CHAINED OFF'); |
162 | } else { |
163 | $self->_dbh->do('SET CHAINED ON'); |
164 | } |
165 | } |
166 | } |
167 | |
168 | =head2 connect_call_blob_setup |
169 | |
170 | Used as: |
171 | |
172 | on_connect_call => [ [ 'blob_setup', log_on_update => 0 ] ] |
173 | |
174 | Does C<< $dbh->{syb_binary_images} = 1; >> to return C<IMAGE> data as raw binary |
175 | instead of as a hex string. |
176 | |
177 | Recommended. |
178 | |
179 | Also sets the C<log_on_update> value for blob write operations. The default is |
180 | C<1>, but C<0> is better if your database is configured for it. |
181 | |
182 | See |
183 | L<DBD::Sybase/Handling_IMAGE/TEXT_data_with_syb_ct_get_data()/syb_ct_send_data()>. |
184 | |
185 | =cut |
186 | |
187 | sub connect_call_blob_setup { |
188 | my $self = shift; |
189 | my %args = @_; |
190 | my $dbh = $self->_dbh; |
191 | $dbh->{syb_binary_images} = 1; |
192 | |
193 | $self->_blob_log_on_update($args{log_on_update}) |
194 | if exists $args{log_on_update}; |
195 | } |
196 | |
197 | sub _is_lob_type { |
198 | my $self = shift; |
199 | my $type = shift; |
200 | $type && $type =~ /(?:text|image|lob|bytea|binary|memo)/i; |
201 | } |
202 | |
2baff5da |
203 | sub _is_lob_column { |
204 | my ($self, $source, $column) = @_; |
205 | |
206 | return $self->_is_lob_type($source->column_info($column)->{data_type}); |
207 | } |
208 | |
d867eeda |
209 | sub _prep_for_execute { |
210 | my $self = shift; |
211 | my ($op, $extra_bind, $ident, $args) = @_; |
212 | |
213 | my ($sql, $bind) = $self->next::method (@_); |
214 | |
215 | if ($op eq 'insert') { |
216 | my $table = $ident->from; |
217 | |
218 | my $bind_info = $self->_resolve_column_info( |
219 | $ident, [map $_->[0], @{$bind}] |
220 | ); |
221 | my $identity_col = List::Util::first |
222 | { $bind_info->{$_}{is_auto_increment} } |
223 | (keys %$bind_info) |
224 | ; |
225 | |
226 | if ($identity_col) { |
227 | $sql = join ("\n", |
228 | "SET IDENTITY_INSERT $table ON", |
229 | $sql, |
230 | "SET IDENTITY_INSERT $table OFF", |
231 | ); |
232 | } |
233 | else { |
234 | $identity_col = List::Util::first |
235 | { $ident->column_info($_)->{is_auto_increment} } |
236 | $ident->columns |
237 | ; |
238 | } |
239 | |
240 | if ($identity_col) { |
241 | $sql = |
242 | "$sql\n" . |
243 | $self->_fetch_identity_sql($ident, $identity_col); |
244 | } |
245 | } |
246 | |
247 | return ($sql, $bind); |
248 | } |
249 | |
250 | # Stolen from SQLT, with some modifications. This is a makeshift |
251 | # solution before a sane type-mapping library is available, thus |
252 | # the 'our' for easy overrides. |
253 | our %TYPE_MAPPING = ( |
254 | number => 'numeric', |
255 | money => 'money', |
256 | varchar => 'varchar', |
257 | varchar2 => 'varchar', |
258 | timestamp => 'datetime', |
259 | text => 'varchar', |
260 | real => 'double precision', |
261 | comment => 'text', |
262 | bit => 'bit', |
263 | tinyint => 'smallint', |
264 | float => 'double precision', |
265 | serial => 'numeric', |
266 | bigserial => 'numeric', |
267 | boolean => 'varchar', |
268 | long => 'varchar', |
269 | ); |
270 | |
271 | sub _native_data_type { |
272 | my ($self, $type) = @_; |
273 | |
274 | $type = lc $type; |
275 | $type =~ s/\s* identity//x; |
276 | |
277 | return uc($TYPE_MAPPING{$type} || $type); |
278 | } |
279 | |
280 | sub _fetch_identity_sql { |
281 | my ($self, $source, $col) = @_; |
282 | |
283 | return sprintf ("SELECT MAX(%s) FROM %s", |
284 | map { $self->sql_maker->_quote ($_) } ($col, $source->from) |
285 | ); |
286 | } |
287 | |
288 | sub _execute { |
289 | my $self = shift; |
290 | my ($op) = @_; |
291 | |
292 | my ($rv, $sth, @bind) = $self->dbh_do($self->can('_dbh_execute'), @_); |
293 | |
294 | if ($op eq 'insert') { |
295 | $self->_identity($sth->fetchrow_array); |
296 | $sth->finish; |
297 | } |
298 | |
299 | return wantarray ? ($rv, $sth, @bind) : $rv; |
300 | } |
301 | |
302 | sub last_insert_id { shift->_identity } |
303 | |
304 | # handles TEXT/IMAGE and transaction for last_insert_id |
305 | sub insert { |
306 | my $self = shift; |
307 | my ($source, $to_insert) = @_; |
308 | |
309 | my $blob_cols = $self->_remove_blob_cols($source, $to_insert); |
310 | |
311 | my $identity_col = List::Util::first |
312 | { $source->column_info($_)->{is_auto_increment} } |
313 | $source->columns; |
314 | |
315 | # do we need the horrific SELECT MAX(COL) hack? |
316 | my $dumb_last_insert_id = |
317 | $identity_col |
318 | && (not exists $to_insert->{$identity_col}) |
319 | && ($self->_identity_method||'') ne '@@IDENTITY'; |
320 | |
321 | my $next = $self->next::can; |
322 | |
323 | # we are already in a transaction, or there are no blobs |
324 | # and we don't need the PK - just (try to) do it |
325 | if ($self->{transaction_depth} |
326 | || (!$blob_cols && !$dumb_last_insert_id) |
327 | ) { |
328 | return $self->_insert ( |
329 | $next, $source, $to_insert, $blob_cols, $identity_col |
330 | ); |
331 | } |
332 | |
333 | # otherwise use the _writer_storage to do the insert+transaction on another |
334 | # connection |
335 | my $guard = $self->_writer_storage->txn_scope_guard; |
336 | |
337 | my $updated_cols = $self->_writer_storage->_insert ( |
338 | $next, $source, $to_insert, $blob_cols, $identity_col |
339 | ); |
340 | |
341 | $self->_identity($self->_writer_storage->_identity); |
342 | |
343 | $guard->commit; |
344 | |
345 | return $updated_cols; |
346 | } |
347 | |
348 | sub _insert { |
349 | my ($self, $next, $source, $to_insert, $blob_cols, $identity_col) = @_; |
350 | |
351 | my $updated_cols = $self->$next ($source, $to_insert); |
352 | |
353 | my $final_row = { |
354 | $identity_col => $self->last_insert_id($source, $identity_col), |
355 | %$to_insert, |
356 | %$updated_cols, |
357 | }; |
358 | |
359 | $self->_insert_blobs ($source, $blob_cols, $final_row) if $blob_cols; |
360 | |
361 | return $updated_cols; |
362 | } |
363 | |
364 | sub update { |
365 | my $self = shift; |
2baff5da |
366 | my ($source, $fields, $where, @rest) = @_; |
d867eeda |
367 | |
368 | my $wantarray = wantarray; |
2baff5da |
369 | |
d867eeda |
370 | my $blob_cols = $self->_remove_blob_cols($source, $fields); |
371 | |
2baff5da |
372 | my $table = $source->name; |
373 | |
374 | my $identity_col = List::Util::first |
375 | { $source->column_info($_)->{is_auto_increment} } |
376 | $source->columns; |
377 | |
378 | my $is_identity_update = $identity_col && defined $fields->{$identity_col}; |
379 | |
d867eeda |
380 | if (not $blob_cols) { |
2baff5da |
381 | $self->_set_identity_insert($table, 'update') if $is_identity_update; |
d867eeda |
382 | return $self->next::method(@_); |
2baff5da |
383 | $self->_unset_identity_insert($table, 'update') if $is_identity_update; |
384 | } |
385 | |
386 | # check that we're not updating a blob column that's also in $where |
387 | for my $blob (grep $self->_is_lob_column($source, $_), $source->columns) { |
388 | if (exists $where->{$blob} && exists $fields->{$blob}) { |
389 | croak |
390 | 'Update of TEXT/IMAGE column that is also in search condition impossible'; |
391 | } |
d867eeda |
392 | } |
393 | |
394 | # update+blob update(s) done atomically on separate connection |
395 | $self = $self->_writer_storage; |
396 | |
397 | my $guard = $self->txn_scope_guard; |
398 | |
2baff5da |
399 | # First update the blob columns to be updated to '' (taken from $fields, where |
400 | # it is originally put by _remove_blob_cols .) |
401 | my %blobs_to_empty = map { ($_ => delete $fields->{$_}) } keys %$blob_cols; |
d867eeda |
402 | |
2baff5da |
403 | $self->next::method($source, \%blobs_to_empty, $where, @rest); |
e19677ad |
404 | |
2baff5da |
405 | # Now update the blobs before the other columns in case the update of other |
406 | # columns makes the search condition invalid. |
d867eeda |
407 | $self->_update_blobs($source, $blob_cols, $where); |
408 | |
2baff5da |
409 | my @res; |
410 | if (%$fields) { |
411 | $self->_set_identity_insert($table, 'update') if $is_identity_update; |
412 | |
413 | if ($wantarray) { |
414 | @res = $self->next::method(@_); |
415 | } |
416 | elsif (defined $wantarray) { |
417 | $res[0] = $self->next::method(@_); |
418 | } |
419 | else { |
420 | $self->next::method(@_); |
421 | } |
422 | |
423 | $self->_unset_identity_insert($table, 'update') if $is_identity_update; |
424 | } |
425 | |
d867eeda |
426 | $guard->commit; |
427 | |
428 | return $wantarray ? @res : $res[0]; |
429 | } |
430 | |
431 | ### the insert_bulk stuff stolen from DBI/MSSQL.pm |
432 | |
433 | sub _set_identity_insert { |
2baff5da |
434 | my ($self, $table, $op) = @_; |
d867eeda |
435 | |
436 | my $sql = sprintf ( |
2baff5da |
437 | 'SET IDENTITY_%s %s ON', |
438 | (uc($op) || 'INSERT'), |
d867eeda |
439 | $self->sql_maker->_quote ($table), |
440 | ); |
441 | |
2baff5da |
442 | $self->_query_start($sql); |
443 | |
d867eeda |
444 | my $dbh = $self->_get_dbh; |
445 | eval { $dbh->do ($sql) }; |
2baff5da |
446 | my $exception = $@; |
447 | |
448 | $self->_query_end($sql); |
449 | |
450 | if ($exception) { |
d867eeda |
451 | $self->throw_exception (sprintf "Error executing '%s': %s", |
452 | $sql, |
453 | $dbh->errstr, |
454 | ); |
455 | } |
456 | } |
457 | |
458 | sub _unset_identity_insert { |
2baff5da |
459 | my ($self, $table, $op) = @_; |
d867eeda |
460 | |
461 | my $sql = sprintf ( |
2baff5da |
462 | 'SET IDENTITY_%s %s OFF', |
463 | (uc($op) || 'INSERT'), |
d867eeda |
464 | $self->sql_maker->_quote ($table), |
465 | ); |
466 | |
2baff5da |
467 | $self->_query_start($sql); |
468 | |
d867eeda |
469 | my $dbh = $self->_get_dbh; |
470 | $dbh->do ($sql); |
2baff5da |
471 | |
472 | $self->_query_end($sql); |
d867eeda |
473 | } |
474 | |
2baff5da |
475 | # for tests |
476 | sub _can_insert_bulk { 1 } |
477 | |
d867eeda |
478 | # XXX this should use the DBD::Sybase bulk API, where possible |
479 | sub insert_bulk { |
480 | my $self = shift; |
481 | my ($source, $cols, $data) = @_; |
482 | |
483 | my $is_identity_insert = (List::Util::first |
484 | { $source->column_info ($_)->{is_auto_increment} } |
485 | (@{$cols}) |
486 | ) |
487 | ? 1 |
488 | : 0; |
489 | |
490 | if ($is_identity_insert) { |
491 | $self->_set_identity_insert ($source->name); |
492 | } |
493 | |
494 | $self->next::method(@_); |
495 | |
496 | if ($is_identity_insert) { |
497 | $self->_unset_identity_insert ($source->name); |
498 | } |
499 | } |
500 | |
501 | ### end of stolen insert_bulk section |
502 | |
2baff5da |
503 | # Make sure blobs are not bound as placeholders, and return any non-empty ones |
504 | # as a hash. |
d867eeda |
505 | sub _remove_blob_cols { |
506 | my ($self, $source, $fields) = @_; |
507 | |
508 | my %blob_cols; |
509 | |
510 | for my $col (keys %$fields) { |
511 | if ($self->_is_lob_type($source->column_info($col)->{data_type})) { |
2baff5da |
512 | my $blob_val = delete $fields->{$col}; |
513 | if (not defined $blob_val) { |
514 | $fields->{$col} = \'NULL'; |
515 | } |
516 | else { |
517 | $fields->{$col} = \"''"; |
518 | $blob_cols{$col} = $blob_val unless $blob_val eq ''; |
519 | } |
d867eeda |
520 | } |
521 | } |
522 | |
523 | return keys %blob_cols ? \%blob_cols : undef; |
524 | } |
525 | |
526 | sub _update_blobs { |
527 | my ($self, $source, $blob_cols, $where) = @_; |
528 | |
529 | my (@primary_cols) = $source->primary_columns; |
530 | |
531 | $self->throw_exception('Cannot update TEXT/IMAGE column(s) without a primary key') |
532 | unless @primary_cols; |
533 | |
534 | # check if we're updating a single row by PK |
535 | my $pk_cols_in_where = 0; |
536 | for my $col (@primary_cols) { |
537 | $pk_cols_in_where++ if defined $where->{$col}; |
538 | } |
539 | my @rows; |
540 | |
541 | if ($pk_cols_in_where == @primary_cols) { |
542 | my %row_to_update; |
543 | @row_to_update{@primary_cols} = @{$where}{@primary_cols}; |
544 | @rows = \%row_to_update; |
545 | } else { |
546 | my $cursor = $self->select ($source, \@primary_cols, $where, {}); |
547 | @rows = map { |
548 | my %row; @row{@primary_cols} = @$_; \%row |
549 | } $cursor->all; |
550 | } |
551 | |
552 | for my $row (@rows) { |
553 | $self->_insert_blobs($source, $blob_cols, $row); |
554 | } |
555 | } |
556 | |
557 | sub _insert_blobs { |
558 | my ($self, $source, $blob_cols, $row) = @_; |
559 | my $dbh = $self->_get_dbh; |
560 | |
2baff5da |
561 | my $table = $source->name; |
d867eeda |
562 | |
563 | my %row = %$row; |
564 | my (@primary_cols) = $source->primary_columns; |
565 | |
566 | $self->throw_exception('Cannot update TEXT/IMAGE column(s) without a primary key') |
567 | unless @primary_cols; |
568 | |
569 | $self->throw_exception('Cannot update TEXT/IMAGE column(s) without primary key values') |
570 | if ((grep { defined $row{$_} } @primary_cols) != @primary_cols); |
571 | |
572 | for my $col (keys %$blob_cols) { |
573 | my $blob = $blob_cols->{$col}; |
574 | |
575 | my %where = map { ($_, $row{$_}) } @primary_cols; |
576 | |
577 | my $cursor = $self->select ($source, [$col], \%where, {}); |
578 | $cursor->next; |
579 | my $sth = $cursor->sth; |
580 | |
2baff5da |
581 | if (not $sth) { |
b561bb6f |
582 | |
583 | $self->throw_exception( |
584 | "Could not find row in table '$table' for blob update:\n" |
585 | . $self->_pretty_print (\%where) |
586 | ); |
2baff5da |
587 | } |
588 | |
d867eeda |
589 | eval { |
590 | do { |
591 | $sth->func('CS_GET', 1, 'ct_data_info') or die $sth->errstr; |
592 | } while $sth->fetch; |
593 | |
594 | $sth->func('ct_prepare_send') or die $sth->errstr; |
595 | |
596 | my $log_on_update = $self->_blob_log_on_update; |
597 | $log_on_update = 1 if not defined $log_on_update; |
598 | |
599 | $sth->func('CS_SET', 1, { |
600 | total_txtlen => length($blob), |
601 | log_on_update => $log_on_update |
602 | }, 'ct_data_info') or die $sth->errstr; |
603 | |
604 | $sth->func($blob, length($blob), 'ct_send_data') or die $sth->errstr; |
605 | |
606 | $sth->func('ct_finish_send') or die $sth->errstr; |
607 | }; |
608 | my $exception = $@; |
609 | $sth->finish if $sth; |
610 | if ($exception) { |
611 | if ($self->using_freetds) { |
612 | $self->throw_exception ( |
613 | 'TEXT/IMAGE operation failed, probably because you are using FreeTDS: ' |
614 | . $exception |
615 | ); |
616 | } else { |
617 | $self->throw_exception($exception); |
618 | } |
619 | } |
620 | } |
621 | } |
622 | |
623 | =head2 connect_call_datetime_setup |
624 | |
625 | Used as: |
626 | |
627 | on_connect_call => 'datetime_setup' |
628 | |
629 | In L<DBIx::Class::Storage::DBI/connect_info> to set: |
630 | |
631 | $dbh->syb_date_fmt('ISO_strict'); # output fmt: 2004-08-21T14:36:48.080Z |
632 | $dbh->do('set dateformat mdy'); # input fmt: 08/13/1979 18:08:55.080 |
633 | |
634 | On connection for use with L<DBIx::Class::InflateColumn::DateTime>, using |
635 | L<DateTime::Format::Sybase>, which you will need to install. |
636 | |
637 | This works for both C<DATETIME> and C<SMALLDATETIME> columns, although |
638 | C<SMALLDATETIME> columns only have minute precision. |
639 | |
640 | =cut |
641 | |
642 | { |
643 | my $old_dbd_warned = 0; |
644 | |
645 | sub connect_call_datetime_setup { |
646 | my $self = shift; |
647 | my $dbh = $self->_dbh; |
648 | |
649 | if ($dbh->can('syb_date_fmt')) { |
650 | # amazingly, this works with FreeTDS |
651 | $dbh->syb_date_fmt('ISO_strict'); |
652 | } elsif (not $old_dbd_warned) { |
653 | carp "Your DBD::Sybase is too old to support ". |
654 | "DBIx::Class::InflateColumn::DateTime, please upgrade!"; |
655 | $old_dbd_warned = 1; |
47d9646a |
656 | } |
d867eeda |
657 | |
658 | $dbh->do('SET DATEFORMAT mdy'); |
659 | |
660 | 1; |
661 | } |
662 | } |
663 | |
664 | sub datetime_parser_type { "DateTime::Format::Sybase" } |
665 | |
666 | # ->begin_work and such have no effect with FreeTDS but we run them anyway to |
667 | # let the DBD keep any state it needs to. |
668 | # |
669 | # If they ever do start working, the extra statements will do no harm (because |
670 | # Sybase supports nested transactions.) |
671 | |
672 | sub _dbh_begin_work { |
673 | my $self = shift; |
674 | $self->next::method(@_); |
675 | if ($self->using_freetds) { |
676 | $self->_get_dbh->do('BEGIN TRAN'); |
677 | } |
47d9646a |
678 | } |
679 | |
d867eeda |
680 | sub _dbh_commit { |
681 | my $self = shift; |
682 | if ($self->using_freetds) { |
683 | $self->_dbh->do('COMMIT'); |
684 | } |
685 | return $self->next::method(@_); |
686 | } |
687 | |
688 | sub _dbh_rollback { |
689 | my $self = shift; |
690 | if ($self->using_freetds) { |
691 | $self->_dbh->do('ROLLBACK'); |
692 | } |
693 | return $self->next::method(@_); |
694 | } |
695 | |
696 | # savepoint support using ASE syntax |
697 | |
698 | sub _svp_begin { |
699 | my ($self, $name) = @_; |
700 | |
701 | $self->_get_dbh->do("SAVE TRANSACTION $name"); |
702 | } |
703 | |
704 | # A new SAVE TRANSACTION with the same name releases the previous one. |
705 | sub _svp_release { 1 } |
706 | |
707 | sub _svp_rollback { |
708 | my ($self, $name) = @_; |
709 | |
710 | $self->_get_dbh->do("ROLLBACK TRANSACTION $name"); |
a964a928 |
711 | } |
712 | |
f68f4d44 |
713 | 1; |
714 | |
d867eeda |
715 | =head1 Schema::Loader Support |
f68f4d44 |
716 | |
d867eeda |
717 | There is an experimental branch of L<DBIx::Class::Schema::Loader> that will |
718 | allow you to dump a schema from most (if not all) versions of Sybase. |
f68f4d44 |
719 | |
d867eeda |
720 | It is available via subversion from: |
721 | |
722 | http://dev.catalyst.perl.org/repos/bast/branches/DBIx-Class-Schema-Loader/current/ |
723 | |
724 | =head1 FreeTDS |
725 | |
726 | This driver supports L<DBD::Sybase> compiled against FreeTDS |
727 | (L<http://www.freetds.org/>) to the best of our ability, however it is |
728 | recommended that you recompile L<DBD::Sybase> against the Sybase Open Client |
729 | libraries. They are a part of the Sybase ASE distribution: |
730 | |
731 | The Open Client FAQ is here: |
732 | L<http://www.isug.com/Sybase_FAQ/ASE/section7.html>. |
733 | |
734 | Sybase ASE for Linux (which comes with the Open Client libraries) may be |
735 | downloaded here: L<http://response.sybase.com/forms/ASE_Linux_Download>. |
736 | |
737 | To see if you're using FreeTDS check C<< $schema->storage->using_freetds >>, or run: |
738 | |
739 | perl -MDBI -le 'my $dbh = DBI->connect($dsn, $user, $pass); print $dbh->{syb_oc_version}' |
740 | |
741 | Some versions of the libraries involved will not support placeholders, in which |
742 | case the storage will be reblessed to |
743 | L<DBIx::Class::Storage::DBI::Sybase::NoBindVars>. |
744 | |
745 | In some configurations, placeholders will work but will throw implicit type |
746 | conversion errors for anything that's not expecting a string. In such a case, |
747 | the C<auto_cast> option from L<DBIx::Class::Storage::DBI::AutoCast> is |
748 | automatically set, which you may enable on connection with |
749 | L<DBIx::Class::Storage::DBI::AutoCast/connect_call_set_auto_cast>. The type info |
750 | for the C<CAST>s is taken from the L<DBIx::Class::ResultSource/data_type> |
751 | definitions in your Result classes, and are mapped to a Sybase type (if it isn't |
752 | already) using a mapping based on L<SQL::Translator>. |
753 | |
754 | In other configurations, placeholers will work just as they do with the Sybase |
755 | Open Client libraries. |
756 | |
757 | Inserts or updates of TEXT/IMAGE columns will B<NOT> work with FreeTDS. |
758 | |
759 | =head1 INSERTS WITH PLACEHOLDERS |
760 | |
761 | With placeholders enabled, inserts are done in a transaction so that there are |
762 | no concurrency issues with getting the inserted identity value using |
763 | C<SELECT MAX(col)>, which is the only way to get the C<IDENTITY> value in this |
764 | mode. |
765 | |
766 | In addition, they are done on a separate connection so that it's possible to |
767 | have active cursors when doing an insert. |
768 | |
769 | When using C<DBIx::Class::Storage::DBI::Sybase::NoBindVars> transactions are |
770 | disabled, as there are no concurrency issues with C<SELECT @@IDENTITY> as it's a |
771 | session variable. |
772 | |
773 | =head1 TRANSACTIONS |
774 | |
775 | Due to limitations of the TDS protocol, L<DBD::Sybase>, or both; you cannot |
776 | begin a transaction while there are active cursors. An active cursor is, for |
777 | example, a L<ResultSet|DBIx::Class::ResultSet> that has been executed using |
778 | C<next> or C<first> but has not been exhausted or |
779 | L<reset|DBIx::Class::ResultSet/reset>. |
780 | |
781 | For example, this will not work: |
782 | |
783 | $schema->txn_do(sub { |
784 | my $rs = $schema->resultset('Book'); |
785 | while (my $row = $rs->next) { |
786 | $schema->resultset('MetaData')->create({ |
787 | book_id => $row->id, |
788 | ... |
789 | }); |
790 | } |
791 | }); |
792 | |
793 | Transactions done for inserts in C<AutoCommit> mode when placeholders are in use |
794 | are not affected, as they are done on an extra database handle. |
795 | |
796 | Some workarounds: |
797 | |
798 | =over 4 |
799 | |
800 | =item * use L<DBIx::Class::Storage::DBI::Replicated> |
801 | |
802 | =item * L<connect|DBIx::Class::Schema/connect> another L<Schema|DBIx::Class::Schema> |
803 | |
804 | =item * load the data from your cursor with L<DBIx::Class::ResultSet/all> |
805 | |
806 | =back |
807 | |
808 | =head1 MAXIMUM CONNECTIONS |
809 | |
810 | The TDS protocol makes separate connections to the server for active statements |
811 | in the background. By default the number of such connections is limited to 25, |
812 | on both the client side and the server side. |
813 | |
814 | This is a bit too low for a complex L<DBIx::Class> application, so on connection |
815 | the client side setting is set to C<256> (see L<DBD::Sybase/maxConnect>.) You |
816 | can override it to whatever setting you like in the DSN. |
817 | |
818 | See |
819 | L<http://infocenter.sybase.com/help/index.jsp?topic=/com.sybase.help.ase_15.0.sag1/html/sag1/sag1272.htm> |
820 | for information on changing the setting on the server side. |
821 | |
822 | =head1 DATES |
823 | |
824 | See L</connect_call_datetime_setup> to setup date formats |
825 | for L<DBIx::Class::InflateColumn::DateTime>. |
826 | |
827 | =head1 TEXT/IMAGE COLUMNS |
828 | |
829 | L<DBD::Sybase> compiled with FreeTDS will B<NOT> allow you to insert or update |
830 | C<TEXT/IMAGE> columns. |
831 | |
832 | Setting C<< $dbh->{LongReadLen} >> will also not work with FreeTDS use either: |
833 | |
834 | $schema->storage->dbh->do("SET TEXTSIZE $bytes"); |
f68f4d44 |
835 | |
d867eeda |
836 | or |
f68f4d44 |
837 | |
d867eeda |
838 | $schema->storage->set_textsize($bytes); |
d4483998 |
839 | |
d867eeda |
840 | instead. |
d4483998 |
841 | |
d867eeda |
842 | However, the C<LongReadLen> you pass in |
843 | L<DBIx::Class::Storage::DBI/connect_info> is used to execute the equivalent |
844 | C<SET TEXTSIZE> command on connection. |
d4483998 |
845 | |
d867eeda |
846 | See L</connect_call_blob_setup> for a L<DBIx::Class::Storage::DBI/connect_info> |
847 | setting you need to work with C<IMAGE> columns. |
f68f4d44 |
848 | |
d867eeda |
849 | =head1 AUTHOR |
f68f4d44 |
850 | |
d867eeda |
851 | See L<DBIx::Class/CONTRIBUTORS>. |
47d9646a |
852 | |
f68f4d44 |
853 | =head1 LICENSE |
854 | |
855 | You may distribute this code under the same terms as Perl itself. |
856 | |
857 | =cut |
d867eeda |
858 | # vim:sts=2 sw=2: |