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