Commit | Line | Data |
3885cff6 |
1 | package DBIx::Class::Storage::DBI::Sybase; |
2 | |
3 | use strict; |
4 | use warnings; |
2ad62d97 |
5 | |
eabab5d0 |
6 | use base qw/ |
2f92e90b |
7 | DBIx::Class::Storage::DBI::Sybase::Common |
07a5866e |
8 | DBIx::Class::Storage::DBI::AutoCast |
eabab5d0 |
9 | /; |
2ad62d97 |
10 | use mro 'c3'; |
6b1f5ef7 |
11 | use Carp::Clan qw/^DBIx::Class/; |
289877b0 |
12 | use List::Util (); |
6b1f5ef7 |
13 | |
285baccb |
14 | __PACKAGE__->mk_group_accessors('simple' => |
322b7a6b |
15 | qw/_identity _blob_log_on_update _insert_dbh _identity_method/ |
285baccb |
16 | ); |
17 | |
98259fe4 |
18 | =head1 NAME |
19 | |
928f0af8 |
20 | DBIx::Class::Storage::DBI::Sybase - Sybase support for DBIx::Class |
98259fe4 |
21 | |
22 | =head1 SYNOPSIS |
23 | |
24 | This subclass supports L<DBD::Sybase> for real Sybase databases. If you are |
25 | using an MSSQL database via L<DBD::Sybase>, your storage will be reblessed to |
26 | L<DBIx::Class::Storage::DBI::Sybase::Microsoft_SQL_Server>. |
27 | |
28 | =head1 DESCRIPTION |
29 | |
30 | If your version of Sybase does not support placeholders, then your storage |
31 | will be reblessed to L<DBIx::Class::Storage::DBI::Sybase::NoBindVars>. You can |
32 | also enable that driver explicitly, see the documentation for more details. |
33 | |
34 | With this driver there is unfortunately no way to get the C<last_insert_id> |
310a0a0a |
35 | without doing a C<SELECT MAX(col)>. This is done safely in a transaction |
322b7a6b |
36 | (locking the table.) See L</INSERTS WITH PLACEHOLDERS>. |
98259fe4 |
37 | |
61cfaef7 |
38 | A recommended L<DBIx::Class::Storage::DBI/connect_info> setting: |
98259fe4 |
39 | |
61cfaef7 |
40 | on_connect_call => [['datetime_setup'], ['blob_setup', log_on_update => 0]] |
98259fe4 |
41 | |
42 | =head1 METHODS |
43 | |
44 | =cut |
45 | |
47d9646a |
46 | sub _rebless { |
b50a5275 |
47 | my $self = shift; |
c5ce7cd6 |
48 | |
49 | if (ref($self) eq 'DBIx::Class::Storage::DBI::Sybase') { |
50 | my $dbtype = eval { |
2eef8633 |
51 | @{$self->_get_dbh->selectrow_arrayref(qq{sp_server_info \@attribute_id=1})}[2] |
c5ce7cd6 |
52 | } || ''; |
53 | |
54 | my $exception = $@; |
55 | $dbtype =~ s/\W/_/gi; |
56 | my $subclass = "DBIx::Class::Storage::DBI::Sybase::${dbtype}"; |
57 | |
58 | if (!$exception && $dbtype && $self->load_optional_class($subclass)) { |
59 | bless $self, $subclass; |
60 | $self->_rebless; |
5703eb14 |
61 | } else { # real Sybase |
62 | my $no_bind_vars = 'DBIx::Class::Storage::DBI::Sybase::NoBindVars'; |
63 | |
e97a6ee2 |
64 | if ($self->using_freetds) { |
a3a526cc |
65 | carp <<'EOF' unless $ENV{DBIC_SYBASE_FREETDS_NOWARN}; |
66 | |
67 | You are using FreeTDS with Sybase. |
5703eb14 |
68 | |
a3a526cc |
69 | We will do our best to support this configuration, but please consider this |
70 | support experimental. |
5703eb14 |
71 | |
a3a526cc |
72 | TEXT/IMAGE columns will definitely not work. |
8c4b6c50 |
73 | |
e97a6ee2 |
74 | You are encouraged to recompile DBD::Sybase with the Sybase Open Client libraries |
a3a526cc |
75 | instead. |
5703eb14 |
76 | |
77 | See perldoc DBIx::Class::Storage::DBI::Sybase for more details. |
a3a526cc |
78 | |
79 | To turn off this warning set the DBIC_SYBASE_FREETDS_NOWARN environment |
80 | variable. |
5703eb14 |
81 | EOF |
70ced519 |
82 | if (not $self->_typeless_placeholders_supported) { |
83 | if ($self->_placeholders_supported) { |
e97a6ee2 |
84 | $self->auto_cast(1); |
a3a526cc |
85 | } else { |
86 | $self->ensure_class_loaded($no_bind_vars); |
87 | bless $self, $no_bind_vars; |
88 | $self->_rebless; |
89 | } |
90 | } |
0ac07712 |
91 | } |
75227502 |
92 | elsif (not $self->_get_dbh->{syb_dynamic_supported}) { |
0ac07712 |
93 | # not necessarily FreeTDS, but no placeholders nevertheless |
61cfaef7 |
94 | $self->ensure_class_loaded($no_bind_vars); |
95 | bless $self, $no_bind_vars; |
96 | $self->_rebless; |
310a0a0a |
97 | } elsif (not $self->_typeless_placeholders_supported) { |
98 | # this is highly unlikely, but we check just in case |
99 | $self->auto_cast(1); |
61cfaef7 |
100 | } |
47d9646a |
101 | } |
c5ce7cd6 |
102 | } |
b50a5275 |
103 | } |
104 | |
37b17a93 |
105 | sub _init { |
106 | my $self = shift; |
107 | $self->_set_max_connect(256); |
108 | |
109 | # based on LongReadLen in connect_info |
110 | $self->set_textsize if $self->using_freetds; |
111 | } |
112 | |
a3a526cc |
113 | # Make sure we have CHAINED mode turned on if AutoCommit is off in non-FreeTDS |
114 | # DBD::Sybase (since we don't know how DBD::Sybase was compiled.) If however |
115 | # we're using FreeTDS, CHAINED mode turns on an implicit transaction which we |
116 | # only want when AutoCommit is off. |
f6de7111 |
117 | sub _populate_dbh { |
118 | my $self = shift; |
41c93b1b |
119 | |
a3a526cc |
120 | $self->next::method(@_); |
41c93b1b |
121 | |
e97a6ee2 |
122 | if (not $self->using_freetds) { |
a3a526cc |
123 | $self->_dbh->{syb_chained_txn} = 1; |
124 | } else { |
125 | if ($self->_dbh_autocommit) { |
126 | $self->_dbh->do('SET CHAINED OFF'); |
127 | } else { |
128 | $self->_dbh->do('SET CHAINED ON'); |
129 | } |
41c93b1b |
130 | } |
131 | } |
132 | |
63d46bb3 |
133 | =head2 connect_call_blob_setup |
134 | |
135 | Used as: |
136 | |
61cfaef7 |
137 | on_connect_call => [ [ 'blob_setup', log_on_update => 0 ] ] |
63d46bb3 |
138 | |
139 | Does C<< $dbh->{syb_binary_images} = 1; >> to return C<IMAGE> data as raw binary |
140 | instead of as a hex string. |
141 | |
6636ad53 |
142 | Recommended. |
143 | |
fd5a07e4 |
144 | Also sets the C<log_on_update> value for blob write operations. The default is |
145 | C<1>, but C<0> is better if your database is configured for it. |
146 | |
147 | See |
148 | L<DBD::Sybase/Handling_IMAGE/TEXT_data_with_syb_ct_get_data()/syb_ct_send_data()>. |
149 | |
63d46bb3 |
150 | =cut |
151 | |
152 | sub connect_call_blob_setup { |
153 | my $self = shift; |
fd5a07e4 |
154 | my %args = @_; |
63d46bb3 |
155 | my $dbh = $self->_dbh; |
156 | $dbh->{syb_binary_images} = 1; |
fd5a07e4 |
157 | |
158 | $self->_blob_log_on_update($args{log_on_update}) |
159 | if exists $args{log_on_update}; |
160 | } |
161 | |
162 | sub _is_lob_type { |
163 | my $self = shift; |
5703eb14 |
164 | my $type = shift; |
078a332f |
165 | $type && $type =~ /(?:text|image|lob|bytea|binary|memo)/i; |
fd5a07e4 |
166 | } |
167 | |
285baccb |
168 | sub _prep_for_execute { |
169 | my $self = shift; |
170 | my ($op, $extra_bind, $ident, $args) = @_; |
171 | |
172 | my ($sql, $bind) = $self->next::method (@_); |
173 | |
174 | if ($op eq 'insert') { |
285baccb |
175 | my $table = $ident->from; |
176 | |
a3a526cc |
177 | my $bind_info = $self->_resolve_column_info( |
178 | $ident, [map $_->[0], @{$bind}] |
179 | ); |
0ac07712 |
180 | my $identity_col = List::Util::first |
181 | { $bind_info->{$_}{is_auto_increment} } |
182 | (keys %$bind_info) |
183 | ; |
285baccb |
184 | |
185 | if ($identity_col) { |
0ac07712 |
186 | $sql = join ("\n", |
187 | "SET IDENTITY_INSERT $table ON", |
188 | $sql, |
189 | "SET IDENTITY_INSERT $table OFF", |
190 | ); |
191 | } |
192 | else { |
193 | $identity_col = List::Util::first |
194 | { $ident->column_info($_)->{is_auto_increment} } |
195 | $ident->columns |
196 | ; |
285baccb |
197 | } |
198 | |
199 | if ($identity_col) { |
285baccb |
200 | $sql = |
285baccb |
201 | "$sql\n" . |
a3a526cc |
202 | $self->_fetch_identity_sql($ident, $identity_col); |
285baccb |
203 | } |
204 | } |
205 | |
206 | return ($sql, $bind); |
207 | } |
208 | |
0ac07712 |
209 | # Stolen from SQLT, with some modifications. This is a makeshift |
210 | # solution before a sane type-mapping library is available, thus |
211 | # the 'our' for easy overrides. |
212 | our %TYPE_MAPPING = ( |
a3a526cc |
213 | number => 'numeric', |
214 | money => 'money', |
215 | varchar => 'varchar', |
216 | varchar2 => 'varchar', |
217 | timestamp => 'datetime', |
218 | text => 'varchar', |
219 | real => 'double precision', |
220 | comment => 'text', |
221 | bit => 'bit', |
222 | tinyint => 'smallint', |
223 | float => 'double precision', |
224 | serial => 'numeric', |
225 | bigserial => 'numeric', |
226 | boolean => 'varchar', |
227 | long => 'varchar', |
228 | ); |
229 | |
07a5866e |
230 | sub _native_data_type { |
a3a526cc |
231 | my ($self, $type) = @_; |
232 | |
233 | $type = lc $type; |
c9d9c670 |
234 | $type =~ s/\s* identity//x; |
a3a526cc |
235 | |
236 | return uc($TYPE_MAPPING{$type} || $type); |
237 | } |
238 | |
285baccb |
239 | sub _fetch_identity_sql { |
240 | my ($self, $source, $col) = @_; |
241 | |
c453ddd9 |
242 | return sprintf ("SELECT MAX(%s) FROM %s", |
243 | map { $self->sql_maker->_quote ($_) } ($col, $source->from) |
244 | ); |
285baccb |
245 | } |
246 | |
247 | sub _execute { |
248 | my $self = shift; |
249 | my ($op) = @_; |
250 | |
251 | my ($rv, $sth, @bind) = $self->dbh_do($self->can('_dbh_execute'), @_); |
252 | |
253 | if ($op eq 'insert') { |
254 | $self->_identity($sth->fetchrow_array); |
255 | $sth->finish; |
256 | } |
257 | |
258 | return wantarray ? ($rv, $sth, @bind) : $rv; |
259 | } |
260 | |
261 | sub last_insert_id { shift->_identity } |
262 | |
aee988d2 |
263 | # handles TEXT/IMAGE and transaction for last_insert_id |
fd5a07e4 |
264 | sub insert { |
0ac07712 |
265 | my $self = shift; |
58e3556d |
266 | my ($source, $to_insert) = @_; |
7d17f469 |
267 | |
268 | my $blob_cols = $self->_remove_blob_cols($source, $to_insert); |
269 | |
c453ddd9 |
270 | my $identity_col = List::Util::first |
271 | { $source->column_info($_)->{is_auto_increment} } |
272 | $source->columns; |
322b7a6b |
273 | |
c453ddd9 |
274 | # do we need the horrific SELECT MAX(COL) hack? |
275 | my $dumb_last_insert_id = |
276 | ( $identity_col |
277 | && (not exists $to_insert->{$identity_col}) |
278 | && ($self->_identity_method||'') ne '@@IDENTITY' |
279 | ) ? 1 : 0; |
280 | |
281 | # we are already in a transaction, or there are no blobs |
282 | # and we don't need the PK - just (try to) do it |
283 | if ($self->{transaction_depth} |
284 | || (!$blob_cols && !$dumb_last_insert_id) |
285 | ) { |
286 | return $self->_insert ($source, $to_insert, $blob_cols, $identity_col); |
287 | } |
322b7a6b |
288 | |
c453ddd9 |
289 | # this is tricky: a transaction needs to take place if we need |
290 | # either a last_insert_id or we will be doing blob insert. |
291 | # This will happen on a *seperate* connection, thus the local() |
292 | # acrobatics |
322b7a6b |
293 | |
c453ddd9 |
294 | local $self->{_dbh}; |
aee988d2 |
295 | |
c453ddd9 |
296 | # localize so it appears right if we blow out with an exception |
297 | local $self->{transaction_depth} = 0; |
310a0a0a |
298 | |
c453ddd9 |
299 | $self->_insert_dbh($self->_connect(@{ $self->_dbi_connect_info })) |
300 | unless $self->_insert_dbh; |
310a0a0a |
301 | |
c453ddd9 |
302 | $self->{_dbh} = $self->_insert_dbh; |
303 | my $guard = $self->txn_scope_guard; |
310a0a0a |
304 | |
c453ddd9 |
305 | # _dbh_begin_work in the guard may reconnect, |
306 | # so we update the accessor just in case |
307 | $self->_insert_dbh($self->_dbh); |
322b7a6b |
308 | |
c453ddd9 |
309 | my $updated_cols = $self->_insert ($source, $to_insert, $blob_cols, $identity_col); |
322b7a6b |
310 | |
c453ddd9 |
311 | $guard->commit; |
322b7a6b |
312 | |
c453ddd9 |
313 | return $updated_cols; |
322b7a6b |
314 | |
c453ddd9 |
315 | } |
7d17f469 |
316 | |
c453ddd9 |
317 | sub _insert { |
318 | my ($self, $source, $to_insert, $blob_cols, $identity_col) = @_; |
7d17f469 |
319 | |
c453ddd9 |
320 | my $updated_cols = $self->next::method ($source, $to_insert); |
321 | |
322 | my $final_row = { |
323 | $identity_col => $self->last_insert_id($source, $identity_col), |
324 | %$to_insert, |
325 | %$updated_cols, |
326 | }; |
327 | |
328 | $self->_insert_blobs ($source, $blob_cols, $final_row) if $blob_cols; |
aee988d2 |
329 | |
7d17f469 |
330 | return $updated_cols; |
331 | } |
332 | |
078a332f |
333 | sub update { |
0ac07712 |
334 | my $self = shift; |
5370e479 |
335 | my ($source, $fields, $where) = @_; |
0ac07712 |
336 | |
337 | my $wantarray = wantarray; |
078a332f |
338 | |
339 | my $blob_cols = $self->_remove_blob_cols($source, $fields); |
340 | |
aee988d2 |
341 | # update+blob update(s) done atomically |
c966cf1b |
342 | my $guard = $self->txn_scope_guard if $blob_cols; |
aee988d2 |
343 | |
078a332f |
344 | my @res; |
345 | if ($wantarray) { |
0ac07712 |
346 | @res = $self->next::method(@_); |
347 | } |
348 | elsif (defined $wantarray) { |
349 | $res[0] = $self->next::method(@_); |
350 | } |
351 | else { |
352 | $self->next::method(@_); |
078a332f |
353 | } |
354 | |
c966cf1b |
355 | $self->_update_blobs($source, $blob_cols, $where) if $blob_cols; |
078a332f |
356 | |
c966cf1b |
357 | $guard->commit if $guard; |
aee988d2 |
358 | |
078a332f |
359 | return $wantarray ? @res : $res[0]; |
360 | } |
7d17f469 |
361 | |
362 | sub _remove_blob_cols { |
363 | my ($self, $source, $fields) = @_; |
fd5a07e4 |
364 | |
365 | my %blob_cols; |
366 | |
7d17f469 |
367 | for my $col (keys %$fields) { |
9b3dabe0 |
368 | if ($self->_is_lob_type($source->column_info($col)->{data_type})) { |
369 | $blob_cols{$col} = delete $fields->{$col}; |
370 | $fields->{$col} = \"''"; |
371 | } |
fd5a07e4 |
372 | } |
373 | |
c966cf1b |
374 | return keys %blob_cols ? \%blob_cols : undef; |
fd5a07e4 |
375 | } |
376 | |
377 | sub _update_blobs { |
5370e479 |
378 | my ($self, $source, $blob_cols, $where) = @_; |
078a332f |
379 | |
380 | my (@primary_cols) = $source->primary_columns; |
381 | |
382 | croak "Cannot update TEXT/IMAGE column(s) without a primary key" |
383 | unless @primary_cols; |
384 | |
385 | # check if we're updating a single row by PK |
386 | my $pk_cols_in_where = 0; |
387 | for my $col (@primary_cols) { |
5370e479 |
388 | $pk_cols_in_where++ if defined $where->{$col}; |
078a332f |
389 | } |
390 | my @rows; |
391 | |
392 | if ($pk_cols_in_where == @primary_cols) { |
393 | my %row_to_update; |
5370e479 |
394 | @row_to_update{@primary_cols} = @{$where}{@primary_cols}; |
078a332f |
395 | @rows = \%row_to_update; |
396 | } else { |
397 | my $rs = $source->resultset->search( |
5370e479 |
398 | $where, |
078a332f |
399 | { |
400 | result_class => 'DBIx::Class::ResultClass::HashRefInflator', |
401 | select => \@primary_cols |
402 | } |
403 | ); |
404 | @rows = $rs->all; # statement must finish |
405 | } |
406 | |
407 | for my $row (@rows) { |
408 | $self->_insert_blobs($source, $blob_cols, $row); |
409 | } |
410 | } |
411 | |
412 | sub _insert_blobs { |
413 | my ($self, $source, $blob_cols, $row) = @_; |
75227502 |
414 | my $dbh = $self->_get_dbh; |
fd5a07e4 |
415 | |
416 | my $table = $source->from; |
417 | |
078a332f |
418 | my %row = %$row; |
fd5a07e4 |
419 | my (@primary_cols) = $source->primary_columns; |
420 | |
9b3dabe0 |
421 | croak "Cannot update TEXT/IMAGE column(s) without a primary key" |
fd5a07e4 |
422 | unless @primary_cols; |
423 | |
078a332f |
424 | if ((grep { defined $row{$_} } @primary_cols) != @primary_cols) { |
c453ddd9 |
425 | croak "Cannot update TEXT/IMAGE column(s) without primary key values"; |
9b3dabe0 |
426 | } |
fd5a07e4 |
427 | |
428 | for my $col (keys %$blob_cols) { |
429 | my $blob = $blob_cols->{$col}; |
430 | |
a3a526cc |
431 | my %where = map { ($_, $row{$_}) } @primary_cols; |
432 | my $cursor = $source->resultset->search(\%where, { |
433 | select => [$col] |
434 | })->cursor; |
435 | $cursor->next; |
5137d252 |
436 | my $sth = $cursor->sth; |
fd5a07e4 |
437 | |
438 | eval { |
a3a526cc |
439 | do { |
fd5a07e4 |
440 | $sth->func('CS_GET', 1, 'ct_data_info') or die $sth->errstr; |
a3a526cc |
441 | } while $sth->fetch; |
442 | |
fd5a07e4 |
443 | $sth->func('ct_prepare_send') or die $sth->errstr; |
444 | |
445 | my $log_on_update = $self->_blob_log_on_update; |
446 | $log_on_update = 1 if not defined $log_on_update; |
447 | |
448 | $sth->func('CS_SET', 1, { |
449 | total_txtlen => length($blob), |
450 | log_on_update => $log_on_update |
451 | }, 'ct_data_info') or die $sth->errstr; |
452 | |
453 | $sth->func($blob, length($blob), 'ct_send_data') or die $sth->errstr; |
454 | |
455 | $sth->func('ct_finish_send') or die $sth->errstr; |
456 | }; |
457 | my $exception = $@; |
a3a526cc |
458 | $sth->finish if $sth; |
459 | if ($exception) { |
e97a6ee2 |
460 | if ($self->using_freetds) { |
0ac07712 |
461 | croak ( |
462 | 'TEXT/IMAGE operation failed, probably because you are using FreeTDS: ' |
463 | . $exception |
464 | ); |
a3a526cc |
465 | } else { |
466 | croak $exception; |
467 | } |
468 | } |
fd5a07e4 |
469 | } |
63d46bb3 |
470 | } |
471 | |
9539eeb1 |
472 | =head2 connect_call_datetime_setup |
473 | |
474 | Used as: |
475 | |
476 | on_connect_call => 'datetime_setup' |
477 | |
478 | In L<DBIx::Class::Storage::DBI/connect_info> to set: |
479 | |
3abafb11 |
480 | $dbh->syb_date_fmt('ISO_strict'); # output fmt: 2004-08-21T14:36:48.080Z |
481 | $dbh->do('set dateformat mdy'); # input fmt: 08/13/1979 18:08:55.080 |
9539eeb1 |
482 | |
483 | On connection for use with L<DBIx::Class::InflateColumn::DateTime>, using |
3abafb11 |
484 | L<DateTime::Format::Sybase>, which you will need to install. |
485 | |
486 | This works for both C<DATETIME> and C<SMALLDATETIME> columns, although |
487 | C<SMALLDATETIME> columns only have minute precision. |
9539eeb1 |
488 | |
489 | =cut |
490 | |
9041a97a |
491 | { |
492 | my $old_dbd_warned = 0; |
493 | |
9539eeb1 |
494 | sub connect_call_datetime_setup { |
6b1f5ef7 |
495 | my $self = shift; |
6b1f5ef7 |
496 | my $dbh = $self->_dbh; |
497 | |
498 | if ($dbh->can('syb_date_fmt')) { |
0ac07712 |
499 | # amazingly, this works with FreeTDS |
6b1f5ef7 |
500 | $dbh->syb_date_fmt('ISO_strict'); |
501 | } elsif (not $old_dbd_warned) { |
502 | carp "Your DBD::Sybase is too old to support ". |
503 | "DBIx::Class::InflateColumn::DateTime, please upgrade!"; |
504 | $old_dbd_warned = 1; |
505 | } |
506 | |
e97a6ee2 |
507 | $dbh->do('SET DATEFORMAT mdy'); |
c5ce7cd6 |
508 | |
6b1f5ef7 |
509 | 1; |
c5ce7cd6 |
510 | } |
6b1f5ef7 |
511 | } |
512 | |
6636ad53 |
513 | sub datetime_parser_type { "DateTime::Format::Sybase" } |
514 | |
e97a6ee2 |
515 | # ->begin_work and such have no effect with FreeTDS but we run them anyway to |
516 | # let the DBD keep any state it needs to. |
517 | # |
518 | # If they ever do start working, the extra statements will do no harm (because |
519 | # Sybase supports nested transactions.) |
a3a526cc |
520 | |
521 | sub _dbh_begin_work { |
522 | my $self = shift; |
e97a6ee2 |
523 | $self->next::method(@_); |
524 | if ($self->using_freetds) { |
75227502 |
525 | $self->_get_dbh->do('BEGIN TRAN'); |
a3a526cc |
526 | } |
527 | } |
528 | |
529 | sub _dbh_commit { |
530 | my $self = shift; |
e97a6ee2 |
531 | if ($self->using_freetds) { |
a3a526cc |
532 | $self->_dbh->do('COMMIT'); |
533 | } |
e97a6ee2 |
534 | return $self->next::method(@_); |
a3a526cc |
535 | } |
536 | |
537 | sub _dbh_rollback { |
538 | my $self = shift; |
e97a6ee2 |
539 | if ($self->using_freetds) { |
a3a526cc |
540 | $self->_dbh->do('ROLLBACK'); |
541 | } |
e97a6ee2 |
542 | return $self->next::method(@_); |
a3a526cc |
543 | } |
544 | |
1816be4f |
545 | # savepoint support using ASE syntax |
546 | |
547 | sub _svp_begin { |
548 | my ($self, $name) = @_; |
549 | |
75227502 |
550 | $self->_get_dbh->do("SAVE TRANSACTION $name"); |
1816be4f |
551 | } |
552 | |
553 | # A new SAVE TRANSACTION with the same name releases the previous one. |
554 | sub _svp_release { 1 } |
555 | |
556 | sub _svp_rollback { |
557 | my ($self, $name) = @_; |
558 | |
75227502 |
559 | $self->_get_dbh->do("ROLLBACK TRANSACTION $name"); |
1816be4f |
560 | } |
561 | |
3885cff6 |
562 | 1; |
563 | |
efe75aaa |
564 | =head1 Schema::Loader Support |
565 | |
566 | There is an experimental branch of L<DBIx::Class::Schema::Loader> that will |
567 | allow you to dump a schema from most (if not all) versions of Sybase. |
568 | |
569 | It is available via subversion from: |
570 | |
07a5866e |
571 | http://dev.catalyst.perl.org/repos/bast/branches/DBIx-Class-Schema-Loader/current/ |
efe75aaa |
572 | |
e97a6ee2 |
573 | =head1 FreeTDS |
574 | |
575 | This driver supports L<DBD::Sybase> compiled against FreeTDS |
576 | (L<http://www.freetds.org/>) to the best of our ability, however it is |
577 | recommended that you recompile L<DBD::Sybase> against the Sybase Open Client |
578 | libraries. They are a part of the Sybase ASE distribution: |
579 | |
580 | The Open Client FAQ is here: |
581 | L<http://www.isug.com/Sybase_FAQ/ASE/section7.html>. |
582 | |
583 | Sybase ASE for Linux (which comes with the Open Client libraries) may be |
584 | downloaded here: L<http://response.sybase.com/forms/ASE_Linux_Download>. |
585 | |
586 | To see if you're using FreeTDS check C<< $schema->storage->using_freetds >>, or run: |
587 | |
588 | perl -MDBI -le 'my $dbh = DBI->connect($dsn, $user, $pass); print $dbh->{syb_oc_version}' |
589 | |
590 | Some versions of the libraries involved will not support placeholders, in which |
591 | case the storage will be reblessed to |
592 | L<DBIx::Class::Storage::DBI::Sybase::NoBindVars>. |
593 | |
07a5866e |
594 | In some configurations, placeholders will work but will throw implicit type |
e97a6ee2 |
595 | conversion errors for anything that's not expecting a string. In such a case, |
07a5866e |
596 | the C<auto_cast> option from L<DBIx::Class::Storage::DBI::AutoCast> is |
597 | automatically set, which you may enable on connection with |
598 | L<DBIx::Class::Storage::DBI::AutoCast/connect_call_set_auto_cast>. The type info |
599 | for the C<CAST>s is taken from the L<DBIx::Class::ResultSource/data_type> |
600 | definitions in your Result classes, and are mapped to a Sybase type (if it isn't |
601 | already) using a mapping based on L<SQL::Translator>. |
e97a6ee2 |
602 | |
603 | In other configurations, placeholers will work just as they do with the Sybase |
604 | Open Client libraries. |
605 | |
606 | Inserts or updates of TEXT/IMAGE columns will B<NOT> work with FreeTDS. |
607 | |
322b7a6b |
608 | =head1 INSERTS WITH PLACEHOLDERS |
609 | |
610 | With placeholders enabled, inserts are done in a transaction so that there are |
611 | no concurrency issues with getting the inserted identity value using |
612 | C<SELECT MAX(col)>, which is the only way to get the C<IDENTITY> value in this |
613 | mode. |
614 | |
615 | When using C<DBIx::Class::Storage::DBI::Sybase::NoBindVars> transactions are |
616 | disabled, as there are no concurrency issues with C<SELECT @@IDENTITY> as it's a |
617 | session variable. |
618 | |
166c6561 |
619 | =head1 TRANSACTIONS |
620 | |
621 | Due to limitations of the TDS protocol, L<DBD::Sybase>, or both; you cannot |
622 | begin a transaction while there are active cursors. An active cursor is, for |
623 | example, a L<ResultSet|DBIx::Class::ResultSet> that has been executed using |
624 | C<next> or C<first> but has not been exhausted or |
75227502 |
625 | L<reset|DBIx::Class::ResultSet/reset>. |
166c6561 |
626 | |
322b7a6b |
627 | For example, this will not work: |
628 | |
629 | $schema->txn_do(sub { |
630 | my $rs = $schema->resultset('Book'); |
631 | while (my $row = $rs->next) { |
632 | $schema->resultset('MetaData')->create({ |
633 | book_id => $row->id, |
634 | ... |
635 | }); |
636 | } |
637 | }); |
638 | |
166c6561 |
639 | Transactions done for inserts in C<AutoCommit> mode when placeholders are in use |
51ac7136 |
640 | are not affected, as they use an extra database handle to do the insert. |
75227502 |
641 | |
642 | Some workarounds: |
643 | |
644 | =over 4 |
645 | |
75227502 |
646 | =item * use L<DBIx::Class::Storage::DBI::Replicated> |
647 | |
648 | =item * L<connect|DBIx::Class::Schema/connect> another L<Schema|DBIx::Class::Schema> |
649 | |
650 | =item * load the data from your cursor with L<DBIx::Class::ResultSet/all> |
651 | |
75227502 |
652 | =back |
166c6561 |
653 | |
41c93b1b |
654 | =head1 MAXIMUM CONNECTIONS |
655 | |
e97a6ee2 |
656 | The TDS protocol makes separate connections to the server for active statements |
657 | in the background. By default the number of such connections is limited to 25, |
658 | on both the client side and the server side. |
41c93b1b |
659 | |
e97a6ee2 |
660 | This is a bit too low for a complex L<DBIx::Class> application, so on connection |
661 | the client side setting is set to C<256> (see L<DBD::Sybase/maxConnect>.) You |
662 | can override it to whatever setting you like in the DSN. |
41c93b1b |
663 | |
664 | See |
665 | L<http://infocenter.sybase.com/help/index.jsp?topic=/com.sybase.help.ase_15.0.sag1/html/sag1/sag1272.htm> |
666 | for information on changing the setting on the server side. |
667 | |
c5ce7cd6 |
668 | =head1 DATES |
669 | |
3abafb11 |
670 | See L</connect_call_datetime_setup> to setup date formats |
671 | for L<DBIx::Class::InflateColumn::DateTime>. |
c5ce7cd6 |
672 | |
e97a6ee2 |
673 | =head1 TEXT/IMAGE COLUMNS |
63d46bb3 |
674 | |
a3a526cc |
675 | L<DBD::Sybase> compiled with FreeTDS will B<NOT> allow you to insert or update |
676 | C<TEXT/IMAGE> columns. |
677 | |
e97a6ee2 |
678 | Setting C<< $dbh->{LongReadLen} >> will also not work with FreeTDS use either: |
679 | |
680 | $schema->storage->dbh->do("SET TEXTSIZE $bytes"); |
a3a526cc |
681 | |
e97a6ee2 |
682 | or |
683 | |
684 | $schema->storage->set_textsize($bytes); |
a3a526cc |
685 | |
686 | instead. |
5703eb14 |
687 | |
e97a6ee2 |
688 | However, the C<LongReadLen> you pass in |
689 | L<DBIx::Class::Storage::DBI/connect_info> is used to execute the equivalent |
690 | C<SET TEXTSIZE> command on connection. |
691 | |
63d46bb3 |
692 | See L</connect_call_blob_setup> for a L<DBIx::Class::Storage::DBI/connect_info> |
693 | setting you need to work with C<IMAGE> columns. |
694 | |
58e3556d |
695 | =head1 AUTHOR |
3885cff6 |
696 | |
7e8cecc1 |
697 | See L<DBIx::Class/CONTRIBUTORS>. |
c5ce7cd6 |
698 | |
3885cff6 |
699 | =head1 LICENSE |
700 | |
701 | You may distribute this code under the same terms as Perl itself. |
702 | |
703 | =cut |
c5ce7cd6 |
704 | # vim:sts=2 sw=2: |