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