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' => |
75227502 |
15 | qw/_identity _blob_log_on_update insert_txn/ |
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 |
36 | (locking the table.) The transaction can be turned off if concurrency is not an |
166c6561 |
37 | issue, or you don't need the C<IDENTITY> value, see |
38 | L<DBIx::Class::Storage::DBI::Sybase/connect_call_unsafe_insert>. |
98259fe4 |
39 | |
40 | But your queries will be cached. |
41 | |
61cfaef7 |
42 | A recommended L<DBIx::Class::Storage::DBI/connect_info> setting: |
98259fe4 |
43 | |
61cfaef7 |
44 | on_connect_call => [['datetime_setup'], ['blob_setup', log_on_update => 0]] |
98259fe4 |
45 | |
46 | =head1 METHODS |
47 | |
48 | =cut |
49 | |
47d9646a |
50 | sub _rebless { |
b50a5275 |
51 | my $self = shift; |
c5ce7cd6 |
52 | |
53 | if (ref($self) eq 'DBIx::Class::Storage::DBI::Sybase') { |
54 | my $dbtype = eval { |
2eef8633 |
55 | @{$self->_get_dbh->selectrow_arrayref(qq{sp_server_info \@attribute_id=1})}[2] |
c5ce7cd6 |
56 | } || ''; |
57 | |
58 | my $exception = $@; |
59 | $dbtype =~ s/\W/_/gi; |
60 | my $subclass = "DBIx::Class::Storage::DBI::Sybase::${dbtype}"; |
61 | |
62 | if (!$exception && $dbtype && $self->load_optional_class($subclass)) { |
63 | bless $self, $subclass; |
64 | $self->_rebless; |
5703eb14 |
65 | } else { # real Sybase |
66 | my $no_bind_vars = 'DBIx::Class::Storage::DBI::Sybase::NoBindVars'; |
67 | |
a3a526cc |
68 | # This is reset to 0 in ::NoBindVars, only necessary because we use max(col) to |
69 | # get the identity. |
310a0a0a |
70 | $self->insert_txn(1); |
a3a526cc |
71 | |
e97a6ee2 |
72 | if ($self->using_freetds) { |
a3a526cc |
73 | carp <<'EOF' unless $ENV{DBIC_SYBASE_FREETDS_NOWARN}; |
74 | |
75 | You are using FreeTDS with Sybase. |
5703eb14 |
76 | |
a3a526cc |
77 | We will do our best to support this configuration, but please consider this |
78 | support experimental. |
5703eb14 |
79 | |
a3a526cc |
80 | TEXT/IMAGE columns will definitely not work. |
8c4b6c50 |
81 | |
e97a6ee2 |
82 | You are encouraged to recompile DBD::Sybase with the Sybase Open Client libraries |
a3a526cc |
83 | instead. |
5703eb14 |
84 | |
85 | See perldoc DBIx::Class::Storage::DBI::Sybase for more details. |
a3a526cc |
86 | |
87 | To turn off this warning set the DBIC_SYBASE_FREETDS_NOWARN environment |
88 | variable. |
5703eb14 |
89 | EOF |
70ced519 |
90 | if (not $self->_typeless_placeholders_supported) { |
91 | if ($self->_placeholders_supported) { |
e97a6ee2 |
92 | $self->auto_cast(1); |
a3a526cc |
93 | } else { |
94 | $self->ensure_class_loaded($no_bind_vars); |
95 | bless $self, $no_bind_vars; |
96 | $self->_rebless; |
97 | } |
98 | } |
61cfaef7 |
99 | |
e97a6ee2 |
100 | $self->set_textsize; # based on LongReadLen in connect_info |
101 | |
0ac07712 |
102 | } |
75227502 |
103 | elsif (not $self->_get_dbh->{syb_dynamic_supported}) { |
0ac07712 |
104 | # not necessarily FreeTDS, but no placeholders nevertheless |
61cfaef7 |
105 | $self->ensure_class_loaded($no_bind_vars); |
106 | bless $self, $no_bind_vars; |
107 | $self->_rebless; |
310a0a0a |
108 | } elsif (not $self->_typeless_placeholders_supported) { |
109 | # this is highly unlikely, but we check just in case |
110 | $self->auto_cast(1); |
61cfaef7 |
111 | } |
0ac07712 |
112 | |
a3a526cc |
113 | $self->_set_max_connect(256); |
47d9646a |
114 | } |
c5ce7cd6 |
115 | } |
b50a5275 |
116 | } |
117 | |
a3a526cc |
118 | # Make sure we have CHAINED mode turned on if AutoCommit is off in non-FreeTDS |
119 | # DBD::Sybase (since we don't know how DBD::Sybase was compiled.) If however |
120 | # we're using FreeTDS, CHAINED mode turns on an implicit transaction which we |
121 | # only want when AutoCommit is off. |
f6de7111 |
122 | sub _populate_dbh { |
123 | my $self = shift; |
41c93b1b |
124 | |
a3a526cc |
125 | $self->next::method(@_); |
41c93b1b |
126 | |
e97a6ee2 |
127 | if (not $self->using_freetds) { |
a3a526cc |
128 | $self->_dbh->{syb_chained_txn} = 1; |
129 | } else { |
130 | if ($self->_dbh_autocommit) { |
131 | $self->_dbh->do('SET CHAINED OFF'); |
132 | } else { |
133 | $self->_dbh->do('SET CHAINED ON'); |
134 | } |
41c93b1b |
135 | } |
136 | } |
137 | |
63d46bb3 |
138 | =head2 connect_call_blob_setup |
139 | |
140 | Used as: |
141 | |
61cfaef7 |
142 | on_connect_call => [ [ 'blob_setup', log_on_update => 0 ] ] |
63d46bb3 |
143 | |
144 | Does C<< $dbh->{syb_binary_images} = 1; >> to return C<IMAGE> data as raw binary |
145 | instead of as a hex string. |
146 | |
6636ad53 |
147 | Recommended. |
148 | |
fd5a07e4 |
149 | Also sets the C<log_on_update> value for blob write operations. The default is |
150 | C<1>, but C<0> is better if your database is configured for it. |
151 | |
152 | See |
153 | L<DBD::Sybase/Handling_IMAGE/TEXT_data_with_syb_ct_get_data()/syb_ct_send_data()>. |
154 | |
63d46bb3 |
155 | =cut |
156 | |
157 | sub connect_call_blob_setup { |
158 | my $self = shift; |
fd5a07e4 |
159 | my %args = @_; |
63d46bb3 |
160 | my $dbh = $self->_dbh; |
161 | $dbh->{syb_binary_images} = 1; |
fd5a07e4 |
162 | |
163 | $self->_blob_log_on_update($args{log_on_update}) |
164 | if exists $args{log_on_update}; |
165 | } |
166 | |
310a0a0a |
167 | =head2 connect_call_unsafe_insert |
168 | |
169 | With placeholders enabled, inserts are done in a transaction so that there are |
170 | no concurrency issues with getting the inserted identity value using |
171 | C<SELECT MAX(col)> when placeholders are enabled. |
172 | |
173 | When using C<DBIx::Class::Storage::DBI::Sybase::NoBindVars> transactions are |
174 | disabled. |
175 | |
176 | To turn off transactions for inserts (for an application that doesn't need |
177 | concurrency, or a loader, for example) use this setting in |
178 | L<DBIx::Class::Storage::DBI/connect_info>, |
179 | |
180 | on_connect_call => ['unsafe_insert'] |
181 | |
182 | To manipulate this setting at runtime, use: |
183 | |
184 | $schema->storage->insert_txn(0); # 1 to re-enable |
185 | |
186 | =cut |
187 | |
188 | sub connect_call_unsafe_insert { |
189 | my $self = shift; |
190 | $self->insert_txn(0); |
191 | } |
192 | |
fd5a07e4 |
193 | sub _is_lob_type { |
194 | my $self = shift; |
5703eb14 |
195 | my $type = shift; |
078a332f |
196 | $type && $type =~ /(?:text|image|lob|bytea|binary|memo)/i; |
fd5a07e4 |
197 | } |
198 | |
285baccb |
199 | sub _prep_for_execute { |
200 | my $self = shift; |
201 | my ($op, $extra_bind, $ident, $args) = @_; |
202 | |
203 | my ($sql, $bind) = $self->next::method (@_); |
204 | |
205 | if ($op eq 'insert') { |
285baccb |
206 | my $table = $ident->from; |
207 | |
a3a526cc |
208 | my $bind_info = $self->_resolve_column_info( |
209 | $ident, [map $_->[0], @{$bind}] |
210 | ); |
0ac07712 |
211 | my $identity_col = List::Util::first |
212 | { $bind_info->{$_}{is_auto_increment} } |
213 | (keys %$bind_info) |
214 | ; |
285baccb |
215 | |
216 | if ($identity_col) { |
0ac07712 |
217 | $sql = join ("\n", |
218 | "SET IDENTITY_INSERT $table ON", |
219 | $sql, |
220 | "SET IDENTITY_INSERT $table OFF", |
221 | ); |
222 | } |
223 | else { |
224 | $identity_col = List::Util::first |
225 | { $ident->column_info($_)->{is_auto_increment} } |
226 | $ident->columns |
227 | ; |
285baccb |
228 | } |
229 | |
230 | if ($identity_col) { |
285baccb |
231 | $sql = |
285baccb |
232 | "$sql\n" . |
a3a526cc |
233 | $self->_fetch_identity_sql($ident, $identity_col); |
285baccb |
234 | } |
235 | } |
236 | |
237 | return ($sql, $bind); |
238 | } |
239 | |
0ac07712 |
240 | # Stolen from SQLT, with some modifications. This is a makeshift |
241 | # solution before a sane type-mapping library is available, thus |
242 | # the 'our' for easy overrides. |
243 | our %TYPE_MAPPING = ( |
a3a526cc |
244 | number => 'numeric', |
245 | money => 'money', |
246 | varchar => 'varchar', |
247 | varchar2 => 'varchar', |
248 | timestamp => 'datetime', |
249 | text => 'varchar', |
250 | real => 'double precision', |
251 | comment => 'text', |
252 | bit => 'bit', |
253 | tinyint => 'smallint', |
254 | float => 'double precision', |
255 | serial => 'numeric', |
256 | bigserial => 'numeric', |
257 | boolean => 'varchar', |
258 | long => 'varchar', |
259 | ); |
260 | |
07a5866e |
261 | sub _native_data_type { |
a3a526cc |
262 | my ($self, $type) = @_; |
263 | |
264 | $type = lc $type; |
265 | $type =~ s/ identity//; |
266 | |
267 | return uc($TYPE_MAPPING{$type} || $type); |
268 | } |
269 | |
285baccb |
270 | sub _fetch_identity_sql { |
271 | my ($self, $source, $col) = @_; |
272 | |
273 | return "SELECT MAX($col) FROM ".$source->from; |
274 | } |
275 | |
276 | sub _execute { |
277 | my $self = shift; |
278 | my ($op) = @_; |
279 | |
280 | my ($rv, $sth, @bind) = $self->dbh_do($self->can('_dbh_execute'), @_); |
281 | |
282 | if ($op eq 'insert') { |
283 | $self->_identity($sth->fetchrow_array); |
284 | $sth->finish; |
285 | } |
286 | |
287 | return wantarray ? ($rv, $sth, @bind) : $rv; |
288 | } |
289 | |
290 | sub last_insert_id { shift->_identity } |
291 | |
a3a526cc |
292 | # override to handle TEXT/IMAGE and to do a transaction if necessary |
fd5a07e4 |
293 | sub insert { |
0ac07712 |
294 | my $self = shift; |
58e3556d |
295 | my ($source, $to_insert) = @_; |
7d17f469 |
296 | |
297 | my $blob_cols = $self->_remove_blob_cols($source, $to_insert); |
298 | |
310a0a0a |
299 | my $need_last_insert_id = 0; |
300 | |
301 | my ($identity_col) = |
302 | map $_->[0], |
303 | grep $_->[1]{is_auto_increment}, |
304 | map [ $_, $source->column_info($_) ], |
305 | $source->columns; |
306 | |
307 | $need_last_insert_id = 1 |
308 | if $identity_col && (not exists $to_insert->{$identity_col}); |
309 | |
0ac07712 |
310 | # We have to do the insert in a transaction to avoid race conditions with the |
311 | # SELECT MAX(COL) identity method used when placeholders are enabled. |
f6de7111 |
312 | my $updated_cols = do { |
310a0a0a |
313 | if ($need_last_insert_id && $self->insert_txn && |
314 | (not $self->{transaction_depth})) { |
0ac07712 |
315 | my $guard = $self->txn_scope_guard; |
316 | my $upd_cols = $self->next::method (@_); |
317 | $guard->commit; |
58e3556d |
318 | $upd_cols; |
0ac07712 |
319 | } |
320 | else { |
321 | $self->next::method(@_); |
a3a526cc |
322 | } |
f6de7111 |
323 | }; |
7d17f469 |
324 | |
078a332f |
325 | $self->_insert_blobs($source, $blob_cols, $to_insert) if %$blob_cols; |
7d17f469 |
326 | |
327 | return $updated_cols; |
328 | } |
329 | |
078a332f |
330 | sub update { |
0ac07712 |
331 | my $self = shift; |
5370e479 |
332 | my ($source, $fields, $where) = @_; |
0ac07712 |
333 | |
334 | my $wantarray = wantarray; |
078a332f |
335 | |
336 | my $blob_cols = $self->_remove_blob_cols($source, $fields); |
337 | |
338 | my @res; |
339 | if ($wantarray) { |
0ac07712 |
340 | @res = $self->next::method(@_); |
341 | } |
342 | elsif (defined $wantarray) { |
343 | $res[0] = $self->next::method(@_); |
344 | } |
345 | else { |
346 | $self->next::method(@_); |
078a332f |
347 | } |
348 | |
5370e479 |
349 | $self->_update_blobs($source, $blob_cols, $where) if %$blob_cols; |
078a332f |
350 | |
351 | return $wantarray ? @res : $res[0]; |
352 | } |
7d17f469 |
353 | |
354 | sub _remove_blob_cols { |
355 | my ($self, $source, $fields) = @_; |
fd5a07e4 |
356 | |
357 | my %blob_cols; |
358 | |
7d17f469 |
359 | for my $col (keys %$fields) { |
9b3dabe0 |
360 | if ($self->_is_lob_type($source->column_info($col)->{data_type})) { |
361 | $blob_cols{$col} = delete $fields->{$col}; |
362 | $fields->{$col} = \"''"; |
363 | } |
fd5a07e4 |
364 | } |
365 | |
7d17f469 |
366 | return \%blob_cols; |
fd5a07e4 |
367 | } |
368 | |
369 | sub _update_blobs { |
5370e479 |
370 | my ($self, $source, $blob_cols, $where) = @_; |
078a332f |
371 | |
372 | my (@primary_cols) = $source->primary_columns; |
373 | |
374 | croak "Cannot update TEXT/IMAGE column(s) without a primary key" |
375 | unless @primary_cols; |
376 | |
377 | # check if we're updating a single row by PK |
378 | my $pk_cols_in_where = 0; |
379 | for my $col (@primary_cols) { |
5370e479 |
380 | $pk_cols_in_where++ if defined $where->{$col}; |
078a332f |
381 | } |
382 | my @rows; |
383 | |
384 | if ($pk_cols_in_where == @primary_cols) { |
385 | my %row_to_update; |
5370e479 |
386 | @row_to_update{@primary_cols} = @{$where}{@primary_cols}; |
078a332f |
387 | @rows = \%row_to_update; |
388 | } else { |
389 | my $rs = $source->resultset->search( |
5370e479 |
390 | $where, |
078a332f |
391 | { |
392 | result_class => 'DBIx::Class::ResultClass::HashRefInflator', |
393 | select => \@primary_cols |
394 | } |
395 | ); |
396 | @rows = $rs->all; # statement must finish |
397 | } |
398 | |
399 | for my $row (@rows) { |
400 | $self->_insert_blobs($source, $blob_cols, $row); |
401 | } |
402 | } |
403 | |
404 | sub _insert_blobs { |
405 | my ($self, $source, $blob_cols, $row) = @_; |
75227502 |
406 | my $dbh = $self->_get_dbh; |
fd5a07e4 |
407 | |
408 | my $table = $source->from; |
409 | |
078a332f |
410 | my %row = %$row; |
fd5a07e4 |
411 | my (@primary_cols) = $source->primary_columns; |
412 | |
9b3dabe0 |
413 | croak "Cannot update TEXT/IMAGE column(s) without a primary key" |
fd5a07e4 |
414 | unless @primary_cols; |
415 | |
078a332f |
416 | if ((grep { defined $row{$_} } @primary_cols) != @primary_cols) { |
9b3dabe0 |
417 | if (@primary_cols == 1) { |
418 | my $col = $primary_cols[0]; |
078a332f |
419 | $row{$col} = $self->last_insert_id($source, $col); |
9b3dabe0 |
420 | } else { |
421 | croak "Cannot update TEXT/IMAGE column(s) without primary key values"; |
422 | } |
423 | } |
fd5a07e4 |
424 | |
425 | for my $col (keys %$blob_cols) { |
426 | my $blob = $blob_cols->{$col}; |
427 | |
a3a526cc |
428 | my %where = map { ($_, $row{$_}) } @primary_cols; |
429 | my $cursor = $source->resultset->search(\%where, { |
430 | select => [$col] |
431 | })->cursor; |
432 | $cursor->next; |
5137d252 |
433 | my $sth = $cursor->sth; |
fd5a07e4 |
434 | |
435 | eval { |
a3a526cc |
436 | do { |
fd5a07e4 |
437 | $sth->func('CS_GET', 1, 'ct_data_info') or die $sth->errstr; |
a3a526cc |
438 | } while $sth->fetch; |
439 | |
fd5a07e4 |
440 | $sth->func('ct_prepare_send') or die $sth->errstr; |
441 | |
442 | my $log_on_update = $self->_blob_log_on_update; |
443 | $log_on_update = 1 if not defined $log_on_update; |
444 | |
445 | $sth->func('CS_SET', 1, { |
446 | total_txtlen => length($blob), |
447 | log_on_update => $log_on_update |
448 | }, 'ct_data_info') or die $sth->errstr; |
449 | |
450 | $sth->func($blob, length($blob), 'ct_send_data') or die $sth->errstr; |
451 | |
452 | $sth->func('ct_finish_send') or die $sth->errstr; |
453 | }; |
454 | my $exception = $@; |
a3a526cc |
455 | $sth->finish if $sth; |
456 | if ($exception) { |
e97a6ee2 |
457 | if ($self->using_freetds) { |
0ac07712 |
458 | croak ( |
459 | 'TEXT/IMAGE operation failed, probably because you are using FreeTDS: ' |
460 | . $exception |
461 | ); |
a3a526cc |
462 | } else { |
463 | croak $exception; |
464 | } |
465 | } |
fd5a07e4 |
466 | } |
63d46bb3 |
467 | } |
468 | |
9539eeb1 |
469 | =head2 connect_call_datetime_setup |
470 | |
471 | Used as: |
472 | |
473 | on_connect_call => 'datetime_setup' |
474 | |
475 | In L<DBIx::Class::Storage::DBI/connect_info> to set: |
476 | |
3abafb11 |
477 | $dbh->syb_date_fmt('ISO_strict'); # output fmt: 2004-08-21T14:36:48.080Z |
478 | $dbh->do('set dateformat mdy'); # input fmt: 08/13/1979 18:08:55.080 |
9539eeb1 |
479 | |
480 | On connection for use with L<DBIx::Class::InflateColumn::DateTime>, using |
3abafb11 |
481 | L<DateTime::Format::Sybase>, which you will need to install. |
482 | |
483 | This works for both C<DATETIME> and C<SMALLDATETIME> columns, although |
484 | C<SMALLDATETIME> columns only have minute precision. |
9539eeb1 |
485 | |
486 | =cut |
487 | |
9041a97a |
488 | { |
489 | my $old_dbd_warned = 0; |
490 | |
9539eeb1 |
491 | sub connect_call_datetime_setup { |
6b1f5ef7 |
492 | my $self = shift; |
6b1f5ef7 |
493 | my $dbh = $self->_dbh; |
494 | |
495 | if ($dbh->can('syb_date_fmt')) { |
0ac07712 |
496 | # amazingly, this works with FreeTDS |
6b1f5ef7 |
497 | $dbh->syb_date_fmt('ISO_strict'); |
498 | } elsif (not $old_dbd_warned) { |
499 | carp "Your DBD::Sybase is too old to support ". |
500 | "DBIx::Class::InflateColumn::DateTime, please upgrade!"; |
501 | $old_dbd_warned = 1; |
502 | } |
503 | |
e97a6ee2 |
504 | $dbh->do('SET DATEFORMAT mdy'); |
c5ce7cd6 |
505 | |
6b1f5ef7 |
506 | 1; |
c5ce7cd6 |
507 | } |
6b1f5ef7 |
508 | } |
509 | |
6636ad53 |
510 | sub datetime_parser_type { "DateTime::Format::Sybase" } |
511 | |
e97a6ee2 |
512 | # ->begin_work and such have no effect with FreeTDS but we run them anyway to |
513 | # let the DBD keep any state it needs to. |
514 | # |
515 | # If they ever do start working, the extra statements will do no harm (because |
516 | # Sybase supports nested transactions.) |
a3a526cc |
517 | |
518 | sub _dbh_begin_work { |
519 | my $self = shift; |
e97a6ee2 |
520 | $self->next::method(@_); |
521 | if ($self->using_freetds) { |
75227502 |
522 | $self->_get_dbh->do('BEGIN TRAN'); |
a3a526cc |
523 | } |
524 | } |
525 | |
526 | sub _dbh_commit { |
527 | my $self = shift; |
e97a6ee2 |
528 | if ($self->using_freetds) { |
a3a526cc |
529 | $self->_dbh->do('COMMIT'); |
530 | } |
e97a6ee2 |
531 | return $self->next::method(@_); |
a3a526cc |
532 | } |
533 | |
534 | sub _dbh_rollback { |
535 | my $self = shift; |
e97a6ee2 |
536 | if ($self->using_freetds) { |
a3a526cc |
537 | $self->_dbh->do('ROLLBACK'); |
538 | } |
e97a6ee2 |
539 | return $self->next::method(@_); |
a3a526cc |
540 | } |
541 | |
1816be4f |
542 | # savepoint support using ASE syntax |
543 | |
544 | sub _svp_begin { |
545 | my ($self, $name) = @_; |
546 | |
75227502 |
547 | $self->_get_dbh->do("SAVE TRANSACTION $name"); |
1816be4f |
548 | } |
549 | |
550 | # A new SAVE TRANSACTION with the same name releases the previous one. |
551 | sub _svp_release { 1 } |
552 | |
553 | sub _svp_rollback { |
554 | my ($self, $name) = @_; |
555 | |
75227502 |
556 | $self->_get_dbh->do("ROLLBACK TRANSACTION $name"); |
1816be4f |
557 | } |
558 | |
3885cff6 |
559 | 1; |
560 | |
efe75aaa |
561 | =head1 Schema::Loader Support |
562 | |
563 | There is an experimental branch of L<DBIx::Class::Schema::Loader> that will |
564 | allow you to dump a schema from most (if not all) versions of Sybase. |
565 | |
566 | It is available via subversion from: |
567 | |
07a5866e |
568 | http://dev.catalyst.perl.org/repos/bast/branches/DBIx-Class-Schema-Loader/current/ |
efe75aaa |
569 | |
e97a6ee2 |
570 | =head1 FreeTDS |
571 | |
572 | This driver supports L<DBD::Sybase> compiled against FreeTDS |
573 | (L<http://www.freetds.org/>) to the best of our ability, however it is |
574 | recommended that you recompile L<DBD::Sybase> against the Sybase Open Client |
575 | libraries. They are a part of the Sybase ASE distribution: |
576 | |
577 | The Open Client FAQ is here: |
578 | L<http://www.isug.com/Sybase_FAQ/ASE/section7.html>. |
579 | |
580 | Sybase ASE for Linux (which comes with the Open Client libraries) may be |
581 | downloaded here: L<http://response.sybase.com/forms/ASE_Linux_Download>. |
582 | |
583 | To see if you're using FreeTDS check C<< $schema->storage->using_freetds >>, or run: |
584 | |
585 | perl -MDBI -le 'my $dbh = DBI->connect($dsn, $user, $pass); print $dbh->{syb_oc_version}' |
586 | |
587 | Some versions of the libraries involved will not support placeholders, in which |
588 | case the storage will be reblessed to |
589 | L<DBIx::Class::Storage::DBI::Sybase::NoBindVars>. |
590 | |
07a5866e |
591 | In some configurations, placeholders will work but will throw implicit type |
e97a6ee2 |
592 | conversion errors for anything that's not expecting a string. In such a case, |
07a5866e |
593 | the C<auto_cast> option from L<DBIx::Class::Storage::DBI::AutoCast> is |
594 | automatically set, which you may enable on connection with |
595 | L<DBIx::Class::Storage::DBI::AutoCast/connect_call_set_auto_cast>. The type info |
596 | for the C<CAST>s is taken from the L<DBIx::Class::ResultSource/data_type> |
597 | definitions in your Result classes, and are mapped to a Sybase type (if it isn't |
598 | already) using a mapping based on L<SQL::Translator>. |
e97a6ee2 |
599 | |
600 | In other configurations, placeholers will work just as they do with the Sybase |
601 | Open Client libraries. |
602 | |
603 | Inserts or updates of TEXT/IMAGE columns will B<NOT> work with FreeTDS. |
604 | |
166c6561 |
605 | =head1 TRANSACTIONS |
606 | |
607 | Due to limitations of the TDS protocol, L<DBD::Sybase>, or both; you cannot |
608 | begin a transaction while there are active cursors. An active cursor is, for |
609 | example, a L<ResultSet|DBIx::Class::ResultSet> that has been executed using |
610 | C<next> or C<first> but has not been exhausted or |
75227502 |
611 | L<reset|DBIx::Class::ResultSet/reset>. |
166c6561 |
612 | |
613 | Transactions done for inserts in C<AutoCommit> mode when placeholders are in use |
75227502 |
614 | are also affected, so this won't work: |
615 | |
616 | while (my $row = $rs1->next) { |
617 | $rs2->create({ foo => $row->foo }); |
618 | } |
619 | |
620 | Some workarounds: |
621 | |
622 | =over 4 |
623 | |
624 | =item * set C<< $schema->storage->insert_txn(0) >> temporarily (see |
625 | L</connect_call_unsafe_insert>) |
626 | |
627 | =item * use L<DBIx::Class::Storage::DBI::Replicated> |
628 | |
629 | =item * L<connect|DBIx::Class::Schema/connect> another L<Schema|DBIx::Class::Schema> |
630 | |
631 | =item * load the data from your cursor with L<DBIx::Class::ResultSet/all> |
632 | |
633 | =item * enlarge the scope of the transaction |
634 | |
635 | =back |
166c6561 |
636 | |
41c93b1b |
637 | =head1 MAXIMUM CONNECTIONS |
638 | |
e97a6ee2 |
639 | The TDS protocol makes separate connections to the server for active statements |
640 | in the background. By default the number of such connections is limited to 25, |
641 | on both the client side and the server side. |
41c93b1b |
642 | |
e97a6ee2 |
643 | This is a bit too low for a complex L<DBIx::Class> application, so on connection |
644 | the client side setting is set to C<256> (see L<DBD::Sybase/maxConnect>.) You |
645 | can override it to whatever setting you like in the DSN. |
41c93b1b |
646 | |
647 | See |
648 | L<http://infocenter.sybase.com/help/index.jsp?topic=/com.sybase.help.ase_15.0.sag1/html/sag1/sag1272.htm> |
649 | for information on changing the setting on the server side. |
650 | |
c5ce7cd6 |
651 | =head1 DATES |
652 | |
3abafb11 |
653 | See L</connect_call_datetime_setup> to setup date formats |
654 | for L<DBIx::Class::InflateColumn::DateTime>. |
c5ce7cd6 |
655 | |
e97a6ee2 |
656 | =head1 TEXT/IMAGE COLUMNS |
63d46bb3 |
657 | |
a3a526cc |
658 | L<DBD::Sybase> compiled with FreeTDS will B<NOT> allow you to insert or update |
659 | C<TEXT/IMAGE> columns. |
660 | |
e97a6ee2 |
661 | Setting C<< $dbh->{LongReadLen} >> will also not work with FreeTDS use either: |
662 | |
663 | $schema->storage->dbh->do("SET TEXTSIZE $bytes"); |
a3a526cc |
664 | |
e97a6ee2 |
665 | or |
666 | |
667 | $schema->storage->set_textsize($bytes); |
a3a526cc |
668 | |
669 | instead. |
5703eb14 |
670 | |
e97a6ee2 |
671 | However, the C<LongReadLen> you pass in |
672 | L<DBIx::Class::Storage::DBI/connect_info> is used to execute the equivalent |
673 | C<SET TEXTSIZE> command on connection. |
674 | |
63d46bb3 |
675 | See L</connect_call_blob_setup> for a L<DBIx::Class::Storage::DBI/connect_info> |
676 | setting you need to work with C<IMAGE> columns. |
677 | |
58e3556d |
678 | =head1 AUTHOR |
3885cff6 |
679 | |
7e8cecc1 |
680 | See L<DBIx::Class/CONTRIBUTORS>. |
c5ce7cd6 |
681 | |
3885cff6 |
682 | =head1 LICENSE |
683 | |
684 | You may distribute this code under the same terms as Perl itself. |
685 | |
686 | =cut |
c5ce7cd6 |
687 | # vim:sts=2 sw=2: |