1 package DBIx::Class::Storage::DBI::Sybase;
7 DBIx::Class::Storage::DBI::Sybase::Common
8 DBIx::Class::Storage::DBI::AutoCast
11 use Carp::Clan qw/^DBIx::Class/;
14 use Data::Dumper::Concise();
16 __PACKAGE__->mk_group_accessors('simple' =>
17 qw/_identity _blob_log_on_update _writer_storage _is_extra_storage
18 _bulk_storage _is_bulk_storage _began_bulk_work
19 _bulk_disabled_due_to_coderef_connect_info_warned
23 my @also_proxy_to_extra_storages = qw/
24 connect_call_set_auto_cast auto_cast connect_call_blob_setup
25 connect_call_datetime_setup
27 disconnect _connect_info _sql_maker _sql_maker_opts disable_sth_caching
28 auto_savepoint unsafe cursor_class debug debugobj schema
33 DBIx::Class::Storage::DBI::Sybase - Sybase support for DBIx::Class
37 This subclass supports L<DBD::Sybase> for real Sybase databases. If you are
38 using an MSSQL database via L<DBD::Sybase>, your storage will be reblessed to
39 L<DBIx::Class::Storage::DBI::Sybase::Microsoft_SQL_Server>.
43 If your version of Sybase does not support placeholders, then your storage
44 will be reblessed to L<DBIx::Class::Storage::DBI::Sybase::NoBindVars>. You can
45 also enable that driver explicitly, see the documentation for more details.
47 With this driver there is unfortunately no way to get the C<last_insert_id>
48 without doing a C<SELECT MAX(col)>. This is done safely in a transaction
49 (locking the table.) See L</INSERTS WITH PLACEHOLDERS>.
51 A recommended L<DBIx::Class::Storage::DBI/connect_info> setting:
53 on_connect_call => [['datetime_setup'], ['blob_setup', log_on_update => 0]]
62 if (ref($self) eq 'DBIx::Class::Storage::DBI::Sybase') {
64 @{$self->_get_dbh->selectrow_arrayref(qq{sp_server_info \@attribute_id=1})}[2]
66 $self->throw_exception("Unable to estable connection to determine database type: $@")
70 my $subclass = "DBIx::Class::Storage::DBI::Sybase::${dbtype}";
72 if ($dbtype && $self->load_optional_class($subclass)) {
73 bless $self, $subclass;
75 } else { # real Sybase
76 my $no_bind_vars = 'DBIx::Class::Storage::DBI::Sybase::NoBindVars';
78 if ($self->using_freetds) {
79 carp <<'EOF' unless $ENV{DBIC_SYBASE_FREETDS_NOWARN};
81 You are using FreeTDS with Sybase.
83 We will do our best to support this configuration, but please consider this
86 TEXT/IMAGE columns will definitely not work.
88 You are encouraged to recompile DBD::Sybase with the Sybase Open Client libraries
91 See perldoc DBIx::Class::Storage::DBI::Sybase for more details.
93 To turn off this warning set the DBIC_SYBASE_FREETDS_NOWARN environment
96 if (not $self->_typeless_placeholders_supported) {
97 if ($self->_placeholders_supported) {
100 $self->ensure_class_loaded($no_bind_vars);
101 bless $self, $no_bind_vars;
106 elsif (not $self->_get_dbh->{syb_dynamic_supported}) {
107 # not necessarily FreeTDS, but no placeholders nevertheless
108 $self->ensure_class_loaded($no_bind_vars);
109 bless $self, $no_bind_vars;
111 } elsif (not $self->_typeless_placeholders_supported) {
112 # this is highly unlikely, but we check just in case
121 $self->_set_max_connect(256);
123 # create storage for insert/(update blob) transactions,
124 # unless this is that storage
125 return if $self->_is_extra_storage;
127 my $writer_storage = (ref $self)->new;
129 $writer_storage->_is_extra_storage(1);
130 $writer_storage->connect_info($self->connect_info);
131 $writer_storage->auto_cast($self->auto_cast);
133 $self->_writer_storage($writer_storage);
135 # create a bulk storage unless connect_info is a coderef
137 if (Scalar::Util::reftype($self->_dbi_connect_info->[0])||'') eq 'CODE';
139 my $bulk_storage = (ref $self)->new;
141 $bulk_storage->_is_extra_storage(1);
142 $bulk_storage->_is_bulk_storage(1); # for special ->disconnect acrobatics
143 $bulk_storage->connect_info($self->connect_info);
146 $bulk_storage->_dbi_connect_info->[0] .= ';bulkLogin=1';
148 $self->_bulk_storage($bulk_storage);
151 for my $method (@also_proxy_to_extra_storages) {
153 no warnings 'redefine';
155 my $replaced = __PACKAGE__->can($method);
157 *{$method} = Sub::Name::subname $method => sub {
159 $self->_writer_storage->$replaced(@_) if $self->_writer_storage;
160 $self->_bulk_storage->$replaced(@_) if $self->_bulk_storage;
161 return $self->$replaced(@_);
168 # Even though we call $sth->finish for uses off the bulk API, there's still an
169 # "active statement" warning on disconnect, which we throw away here.
170 # This is due to the bug described in insert_bulk.
171 # Currently a noop because 'prepare' is used instead of 'prepare_cached'.
172 local $SIG{__WARN__} = sub {
173 warn $_[0] unless $_[0] =~ /active statement/i;
174 } if $self->_is_bulk_storage;
176 # so that next transaction gets a dbh
177 $self->_began_bulk_work(0) if $self->_is_bulk_storage;
182 # Set up session settings for Sybase databases for the connection.
184 # Make sure we have CHAINED mode turned on if AutoCommit is off in non-FreeTDS
185 # DBD::Sybase (since we don't know how DBD::Sybase was compiled.) If however
186 # we're using FreeTDS, CHAINED mode turns on an implicit transaction which we
187 # only want when AutoCommit is off.
189 # Also SET TEXTSIZE for FreeTDS because LongReadLen doesn't work.
190 sub _run_connection_actions {
193 if ($self->_is_bulk_storage) {
194 # this should be cleared on every reconnect
195 $self->_began_bulk_work(0);
199 if (not $self->using_freetds) {
200 $self->_dbh->{syb_chained_txn} = 1;
202 # based on LongReadLen in connect_info
205 if ($self->_dbh_autocommit) {
206 $self->_dbh->do('SET CHAINED OFF');
208 $self->_dbh->do('SET CHAINED ON');
212 $self->next::method(@_);
215 =head2 connect_call_blob_setup
219 on_connect_call => [ [ 'blob_setup', log_on_update => 0 ] ]
221 Does C<< $dbh->{syb_binary_images} = 1; >> to return C<IMAGE> data as raw binary
222 instead of as a hex string.
226 Also sets the C<log_on_update> value for blob write operations. The default is
227 C<1>, but C<0> is better if your database is configured for it.
230 L<DBD::Sybase/Handling_IMAGE/TEXT_data_with_syb_ct_get_data()/syb_ct_send_data()>.
234 sub connect_call_blob_setup {
237 my $dbh = $self->_dbh;
238 $dbh->{syb_binary_images} = 1;
240 $self->_blob_log_on_update($args{log_on_update})
241 if exists $args{log_on_update};
247 $type && $type =~ /(?:text|image|lob|bytea|binary|memo)/i;
251 my ($self, $source, $column) = @_;
253 return $self->_is_lob_type($source->column_info($column)->{data_type});
256 sub _prep_for_execute {
258 my ($op, $extra_bind, $ident, $args) = @_;
260 my ($sql, $bind) = $self->next::method (@_);
262 my $table = Scalar::Util::blessed($ident) ? $ident->from : $ident;
264 my $bind_info = $self->_resolve_column_info(
265 $ident, [map $_->[0], @{$bind}]
267 my $bound_identity_col = List::Util::first
268 { $bind_info->{$_}{is_auto_increment} }
271 my $identity_col = Scalar::Util::blessed($ident) &&
273 { $ident->column_info($_)->{is_auto_increment} }
277 if (($op eq 'insert' && $bound_identity_col) ||
278 ($op eq 'update' && exists $args->[0]{$identity_col})) {
280 $self->_set_table_identity_sql($op => $table, 'on'),
282 $self->_set_table_identity_sql($op => $table, 'off'),
286 if ($op eq 'insert' && (not $bound_identity_col) && $identity_col &&
287 (not $self->{insert_bulk})) {
290 $self->_fetch_identity_sql($ident, $identity_col);
293 return ($sql, $bind);
296 sub _set_table_identity_sql {
297 my ($self, $op, $table, $on_off) = @_;
299 return sprintf 'SET IDENTITY_%s %s %s',
300 uc($op), $self->sql_maker->_quote($table), uc($on_off);
303 # Stolen from SQLT, with some modifications. This is a makeshift
304 # solution before a sane type-mapping library is available, thus
305 # the 'our' for easy overrides.
306 our %TYPE_MAPPING = (
309 varchar => 'varchar',
310 varchar2 => 'varchar',
311 timestamp => 'datetime',
313 real => 'double precision',
316 tinyint => 'smallint',
317 float => 'double precision',
319 bigserial => 'numeric',
320 boolean => 'varchar',
324 sub _native_data_type {
325 my ($self, $type) = @_;
328 $type =~ s/\s* identity//x;
330 return uc($TYPE_MAPPING{$type} || $type);
333 sub _fetch_identity_sql {
334 my ($self, $source, $col) = @_;
336 return sprintf ("SELECT MAX(%s) FROM %s",
337 map { $self->sql_maker->_quote ($_) } ($col, $source->from)
345 my ($rv, $sth, @bind) = $self->dbh_do($self->can('_dbh_execute'), @_);
347 if ($op eq 'insert') {
348 $self->_identity($sth->fetchrow_array);
352 return wantarray ? ($rv, $sth, @bind) : $rv;
355 sub last_insert_id { shift->_identity }
357 # handles TEXT/IMAGE and transaction for last_insert_id
360 my ($source, $to_insert) = @_;
362 my $identity_col = (List::Util::first
363 { $source->column_info($_)->{is_auto_increment} }
364 $source->columns) || '';
366 # check for empty insert
367 # INSERT INTO foo DEFAULT VALUES -- does not work with Sybase
368 # try to insert explicit 'DEFAULT's instead (except for identity)
369 if (not %$to_insert) {
370 for my $col ($source->columns) {
371 next if $col eq $identity_col;
372 $to_insert->{$col} = \'DEFAULT';
376 my $blob_cols = $self->_remove_blob_cols($source, $to_insert);
378 # do we need the horrific SELECT MAX(COL) hack?
379 my $dumb_last_insert_id =
381 && (not exists $to_insert->{$identity_col})
382 && ($self->_identity_method||'') ne '@@IDENTITY';
384 my $next = $self->next::can;
386 # we are already in a transaction, or there are no blobs
387 # and we don't need the PK - just (try to) do it
388 if ($self->{transaction_depth}
389 || (!$blob_cols && !$dumb_last_insert_id)
391 return $self->_insert (
392 $next, $source, $to_insert, $blob_cols, $identity_col
396 # otherwise use the _writer_storage to do the insert+transaction on another
398 my $guard = $self->_writer_storage->txn_scope_guard;
400 my $updated_cols = $self->_writer_storage->_insert (
401 $next, $source, $to_insert, $blob_cols, $identity_col
404 $self->_identity($self->_writer_storage->_identity);
408 return $updated_cols;
412 my ($self, $next, $source, $to_insert, $blob_cols, $identity_col) = @_;
414 my $updated_cols = $self->$next ($source, $to_insert);
418 ($identity_col => $self->last_insert_id($source, $identity_col)) : ()),
423 $self->_insert_blobs ($source, $blob_cols, $final_row) if $blob_cols;
425 return $updated_cols;
430 my ($source, $fields, $where, @rest) = @_;
432 my $wantarray = wantarray;
434 my $blob_cols = $self->_remove_blob_cols($source, $fields);
436 my $table = $source->name;
438 my $identity_col = List::Util::first
439 { $source->column_info($_)->{is_auto_increment} }
442 my $is_identity_update = $identity_col && defined $fields->{$identity_col};
444 return $self->next::method(@_) unless $blob_cols;
446 # If there are any blobs in $where, Sybase will return a descriptive error
448 # XXX blobs can still be used with a LIKE query, and this should be handled.
450 # update+blob update(s) done atomically on separate connection
451 $self = $self->_writer_storage;
453 my $guard = $self->txn_scope_guard;
455 # First update the blob columns to be updated to '' (taken from $fields, where
456 # it is originally put by _remove_blob_cols .)
457 my %blobs_to_empty = map { ($_ => delete $fields->{$_}) } keys %$blob_cols;
459 # We can't only update NULL blobs, because blobs cannot be in the WHERE clause.
461 $self->next::method($source, \%blobs_to_empty, $where, @rest);
463 # Now update the blobs before the other columns in case the update of other
464 # columns makes the search condition invalid.
465 $self->_update_blobs($source, $blob_cols, $where);
470 @res = $self->next::method(@_);
472 elsif (defined $wantarray) {
473 $res[0] = $self->next::method(@_);
476 $self->next::method(@_);
482 return $wantarray ? @res : $res[0];
487 my ($source, $cols, $data) = @_;
489 my $identity_col = List::Util::first
490 { $source->column_info($_)->{is_auto_increment} }
493 my $is_identity_insert = (List::Util::first
494 { $_ eq $identity_col }
498 my @source_columns = $source->columns;
501 $self->_bulk_storage &&
502 $self->_get_dbh->{syb_has_blk};
504 if ((not $use_bulk_api) &&
505 (Scalar::Util::reftype($self->_dbi_connect_info->[0])||'') eq 'CODE' &&
506 (not $self->_bulk_disabled_due_to_coderef_connect_info_warned)) {
508 Bulk API support disabled due to use of a CODEREF connect_info. Reverting to
509 regular array inserts.
511 $self->_bulk_disabled_due_to_coderef_connect_info_warned(1);
514 if (not $use_bulk_api) {
515 my $blob_cols = $self->_remove_blob_cols_array($source, $cols, $data);
517 # _execute_array uses a txn anyway, but it ends too early in case we need to
518 # select max(col) to get the identity for inserting blobs.
519 ($self, my $guard) = $self->{transaction_depth} == 0 ?
520 ($self->_writer_storage, $self->_writer_storage->txn_scope_guard)
524 local $self->{insert_bulk} = 1;
526 $self->next::method(@_);
529 if ($is_identity_insert) {
530 $self->_insert_blobs_array ($source, $blob_cols, $cols, $data);
533 my @cols_with_identities = (@$cols, $identity_col);
535 ## calculate identities
536 # XXX This assumes identities always increase by 1, which may or may not
538 my ($last_identity) =
539 $self->_dbh->selectrow_array (
540 $self->_fetch_identity_sql($source, $identity_col)
542 my @identities = (($last_identity - @$data + 1) .. $last_identity);
544 my @data_with_identities = map [@$_, shift @identities], @$data;
546 $self->_insert_blobs_array (
547 $source, $blob_cols, \@cols_with_identities, \@data_with_identities
552 $guard->commit if $guard;
557 # otherwise, use the bulk API
559 # rearrange @$data so that columns are in database order
561 @orig_idx{@$cols} = 0..$#$cols;
564 @new_idx{@source_columns} = 0..$#source_columns;
567 for my $datum (@$data) {
569 for my $col (@source_columns) {
570 # identity data will be 'undef' if not $is_identity_insert
571 # columns with defaults will also be 'undef'
572 $new_datum->[ $new_idx{$col} ] =
573 exists $orig_idx{$col} ? $datum->[ $orig_idx{$col} ] : undef;
575 push @new_data, $new_datum;
578 # bcp identity index is 1-based
579 my $identity_idx = exists $new_idx{$identity_col} ?
580 $new_idx{$identity_col} + 1 : 0;
582 ## Set a client-side conversion error handler, straight from DBD::Sybase docs.
583 # This ignores any data conversion errors detected by the client side libs, as
584 # they are usually harmless.
585 my $orig_cslib_cb = DBD::Sybase::set_cslib_cb(
586 Sub::Name::subname insert_bulk => sub {
587 my ($layer, $origin, $severity, $errno, $errmsg, $osmsg, $blkmsg) = @_;
589 return 1 if $errno == 36;
592 "Layer: $layer, Origin: $origin, Severity: $severity, Error: $errno" .
593 ($errmsg ? "\n$errmsg" : '') .
594 ($osmsg ? "\n$osmsg" : '') .
595 ($blkmsg ? "\n$blkmsg" : '');
601 my $bulk = $self->_bulk_storage;
603 my $guard = $bulk->txn_scope_guard;
605 ## XXX get this to work instead of our own $sth
606 ## will require SQLA or *Hacks changes for ordered columns
607 # $bulk->next::method($source, \@source_columns, \@new_data, {
608 # syb_bcp_attribs => {
609 # identity_flag => $is_identity_insert,
610 # identity_column => $identity_idx,
613 my $sql = 'INSERT INTO ' .
614 $bulk->sql_maker->_quote($source->name) . ' (' .
615 # colname list is ignored for BCP, but does no harm
616 (join ', ', map $bulk->sql_maker->_quote($_), @source_columns) . ') '.
617 ' VALUES ('. (join ', ', ('?') x @source_columns) . ')';
619 ## XXX there's a bug in the DBD::Sybase bulk support that makes $sth->finish for
620 ## a prepare_cached statement ineffective. Replace with ->sth when fixed, or
621 ## better yet the version above. Should be fixed in DBD::Sybase .
622 my $sth = $bulk->_get_dbh->prepare($sql,
626 identity_flag => $is_identity_insert,
627 identity_column => $identity_idx,
634 map [ $_, $idx++ ], @source_columns;
637 $self->_execute_array(
638 $source, $sth, \@bind, \@source_columns, \@new_data, sub {
643 $bulk->_query_end($sql);
647 DBD::Sybase::set_cslib_cb($orig_cslib_cb);
649 if ($exception =~ /-Y option/) {
652 Sybase bulk API operation failed due to character set incompatibility, reverting
653 to regular array inserts:
655 *** Try unsetting the LANG environment variable.
659 $self->_bulk_storage(undef);
664 # rollback makes the bulkLogin connection unusable
665 $self->_bulk_storage->disconnect;
666 $self->throw_exception($exception);
670 sub _dbh_execute_array {
671 my ($self, $sth, $tuple_status, $cb) = @_;
673 my $rv = $self->next::method($sth, $tuple_status);
679 # Make sure blobs are not bound as placeholders, and return any non-empty ones
681 sub _remove_blob_cols {
682 my ($self, $source, $fields) = @_;
686 for my $col (keys %$fields) {
687 if ($self->_is_lob_column($source, $col)) {
688 my $blob_val = delete $fields->{$col};
689 if (not defined $blob_val) {
690 $fields->{$col} = \'NULL';
693 $fields->{$col} = \"''";
694 $blob_cols{$col} = $blob_val unless $blob_val eq '';
699 return %blob_cols ? \%blob_cols : undef;
702 # same for insert_bulk
703 sub _remove_blob_cols_array {
704 my ($self, $source, $cols, $data) = @_;
708 for my $i (0..$#$cols) {
709 my $col = $cols->[$i];
711 if ($self->_is_lob_column($source, $col)) {
712 for my $j (0..$#$data) {
713 my $blob_val = delete $data->[$j][$i];
714 if (not defined $blob_val) {
715 $data->[$j][$i] = \'NULL';
718 $data->[$j][$i] = \"''";
719 $blob_cols[$j][$i] = $blob_val
720 unless $blob_val eq '';
726 return @blob_cols ? \@blob_cols : undef;
730 my ($self, $source, $blob_cols, $where) = @_;
732 my (@primary_cols) = $source->primary_columns;
734 $self->throw_exception('Cannot update TEXT/IMAGE column(s) without a primary key')
735 unless @primary_cols;
737 # check if we're updating a single row by PK
738 my $pk_cols_in_where = 0;
739 for my $col (@primary_cols) {
740 $pk_cols_in_where++ if defined $where->{$col};
744 if ($pk_cols_in_where == @primary_cols) {
746 @row_to_update{@primary_cols} = @{$where}{@primary_cols};
747 @rows = \%row_to_update;
749 my $cursor = $self->select ($source, \@primary_cols, $where, {});
751 my %row; @row{@primary_cols} = @$_; \%row
755 for my $row (@rows) {
756 $self->_insert_blobs($source, $blob_cols, $row);
761 my ($self, $source, $blob_cols, $row) = @_;
762 my $dbh = $self->_get_dbh;
764 my $table = $source->name;
767 my (@primary_cols) = $source->primary_columns;
769 $self->throw_exception('Cannot update TEXT/IMAGE column(s) without a primary key')
770 unless @primary_cols;
772 $self->throw_exception('Cannot update TEXT/IMAGE column(s) without primary key values')
773 if ((grep { defined $row{$_} } @primary_cols) != @primary_cols);
775 for my $col (keys %$blob_cols) {
776 my $blob = $blob_cols->{$col};
778 my %where = map { ($_, $row{$_}) } @primary_cols;
780 my $cursor = $self->select ($source, [$col], \%where, {});
782 my $sth = $cursor->sth;
786 $self->throw_exception(
787 "Could not find row in table '$table' for blob update:\n"
788 . Data::Dumper::Concise::Dumper (\%where)
794 $sth->func('CS_GET', 1, 'ct_data_info') or die $sth->errstr;
797 $sth->func('ct_prepare_send') or die $sth->errstr;
799 my $log_on_update = $self->_blob_log_on_update;
800 $log_on_update = 1 if not defined $log_on_update;
802 $sth->func('CS_SET', 1, {
803 total_txtlen => length($blob),
804 log_on_update => $log_on_update
805 }, 'ct_data_info') or die $sth->errstr;
807 $sth->func($blob, length($blob), 'ct_send_data') or die $sth->errstr;
809 $sth->func('ct_finish_send') or die $sth->errstr;
812 $sth->finish if $sth;
814 if ($self->using_freetds) {
815 $self->throw_exception (
816 'TEXT/IMAGE operation failed, probably because you are using FreeTDS: '
820 $self->throw_exception($exception);
826 sub _insert_blobs_array {
827 my ($self, $source, $blob_cols, $cols, $data) = @_;
829 for my $i (0..$#$data) {
830 my $datum = $data->[$i];
833 @row{ @$cols } = @$datum;
836 for my $j (0..$#$cols) {
837 if (exists $blob_cols->[$i][$j]) {
838 $blob_vals{ $cols->[$j] } = $blob_cols->[$i][$j];
842 $self->_insert_blobs ($source, \%blob_vals, \%row);
846 =head2 connect_call_datetime_setup
850 on_connect_call => 'datetime_setup'
852 In L<DBIx::Class::Storage::DBI/connect_info> to set:
854 $dbh->syb_date_fmt('ISO_strict'); # output fmt: 2004-08-21T14:36:48.080Z
855 $dbh->do('set dateformat mdy'); # input fmt: 08/13/1979 18:08:55.080
857 On connection for use with L<DBIx::Class::InflateColumn::DateTime>, using
858 L<DateTime::Format::Sybase>, which you will need to install.
860 This works for both C<DATETIME> and C<SMALLDATETIME> columns, although
861 C<SMALLDATETIME> columns only have minute precision.
866 my $old_dbd_warned = 0;
868 sub connect_call_datetime_setup {
870 my $dbh = $self->_get_dbh;
872 if ($dbh->can('syb_date_fmt')) {
873 # amazingly, this works with FreeTDS
874 $dbh->syb_date_fmt('ISO_strict');
875 } elsif (not $old_dbd_warned) {
876 carp "Your DBD::Sybase is too old to support ".
877 "DBIx::Class::InflateColumn::DateTime, please upgrade!";
881 $dbh->do('SET DATEFORMAT mdy');
887 sub datetime_parser_type { "DateTime::Format::Sybase" }
889 # ->begin_work and such have no effect with FreeTDS but we run them anyway to
890 # let the DBD keep any state it needs to.
892 # If they ever do start working, the extra statements will do no harm (because
893 # Sybase supports nested transactions.)
895 sub _dbh_begin_work {
898 # bulkLogin=1 connections are always in a transaction, and can only call BEGIN
899 # TRAN once. However, we need to make sure there's a $dbh.
900 return if $self->_is_bulk_storage && $self->_dbh && $self->_began_bulk_work;
902 $self->next::method(@_);
904 if ($self->using_freetds) {
905 $self->_get_dbh->do('BEGIN TRAN');
908 $self->_began_bulk_work(1) if $self->_is_bulk_storage;
913 if ($self->using_freetds) {
914 $self->_dbh->do('COMMIT');
916 return $self->next::method(@_);
921 if ($self->using_freetds) {
922 $self->_dbh->do('ROLLBACK');
924 return $self->next::method(@_);
927 # savepoint support using ASE syntax
930 my ($self, $name) = @_;
932 $self->_get_dbh->do("SAVE TRANSACTION $name");
935 # A new SAVE TRANSACTION with the same name releases the previous one.
936 sub _svp_release { 1 }
939 my ($self, $name) = @_;
941 $self->_get_dbh->do("ROLLBACK TRANSACTION $name");
946 =head1 Schema::Loader Support
948 There is an experimental branch of L<DBIx::Class::Schema::Loader> that will
949 allow you to dump a schema from most (if not all) versions of Sybase.
951 It is available via subversion from:
953 http://dev.catalyst.perl.org/repos/bast/branches/DBIx-Class-Schema-Loader/current/
957 This driver supports L<DBD::Sybase> compiled against FreeTDS
958 (L<http://www.freetds.org/>) to the best of our ability, however it is
959 recommended that you recompile L<DBD::Sybase> against the Sybase Open Client
960 libraries. They are a part of the Sybase ASE distribution:
962 The Open Client FAQ is here:
963 L<http://www.isug.com/Sybase_FAQ/ASE/section7.html>.
965 Sybase ASE for Linux (which comes with the Open Client libraries) may be
966 downloaded here: L<http://response.sybase.com/forms/ASE_Linux_Download>.
968 To see if you're using FreeTDS check C<< $schema->storage->using_freetds >>, or run:
970 perl -MDBI -le 'my $dbh = DBI->connect($dsn, $user, $pass); print $dbh->{syb_oc_version}'
972 Some versions of the libraries involved will not support placeholders, in which
973 case the storage will be reblessed to
974 L<DBIx::Class::Storage::DBI::Sybase::NoBindVars>.
976 In some configurations, placeholders will work but will throw implicit type
977 conversion errors for anything that's not expecting a string. In such a case,
978 the C<auto_cast> option from L<DBIx::Class::Storage::DBI::AutoCast> is
979 automatically set, which you may enable on connection with
980 L<DBIx::Class::Storage::DBI::AutoCast/connect_call_set_auto_cast>. The type info
981 for the C<CAST>s is taken from the L<DBIx::Class::ResultSource/data_type>
982 definitions in your Result classes, and are mapped to a Sybase type (if it isn't
983 already) using a mapping based on L<SQL::Translator>.
985 In other configurations, placeholers will work just as they do with the Sybase
986 Open Client libraries.
988 Inserts or updates of TEXT/IMAGE columns will B<NOT> work with FreeTDS.
990 =head1 INSERTS WITH PLACEHOLDERS
992 With placeholders enabled, inserts are done in a transaction so that there are
993 no concurrency issues with getting the inserted identity value using
994 C<SELECT MAX(col)>, which is the only way to get the C<IDENTITY> value in this
997 In addition, they are done on a separate connection so that it's possible to
998 have active cursors when doing an insert.
1000 When using C<DBIx::Class::Storage::DBI::Sybase::NoBindVars> transactions are
1001 disabled, as there are no concurrency issues with C<SELECT @@IDENTITY> as it's a
1006 Due to limitations of the TDS protocol, L<DBD::Sybase>, or both; you cannot
1007 begin a transaction while there are active cursors; nor can you use multiple
1008 active cursors within a transaction. An active cursor is, for example, a
1009 L<ResultSet|DBIx::Class::ResultSet> that has been executed using C<next> or
1010 C<first> but has not been exhausted or L<reset|DBIx::Class::ResultSet/reset>.
1012 For example, this will not work:
1014 $schema->txn_do(sub {
1015 my $rs = $schema->resultset('Book');
1016 while (my $row = $rs->next) {
1017 $schema->resultset('MetaData')->create({
1018 book_id => $row->id,
1026 my $first_row = $large_rs->first;
1027 $schema->txn_do(sub { ... });
1029 Transactions done for inserts in C<AutoCommit> mode when placeholders are in use
1030 are not affected, as they are done on an extra database handle.
1036 =item * use L<DBIx::Class::Storage::DBI::Replicated>
1038 =item * L<connect|DBIx::Class::Schema/connect> another L<Schema|DBIx::Class::Schema>
1040 =item * load the data from your cursor with L<DBIx::Class::ResultSet/all>
1044 =head1 MAXIMUM CONNECTIONS
1046 The TDS protocol makes separate connections to the server for active statements
1047 in the background. By default the number of such connections is limited to 25,
1048 on both the client side and the server side.
1050 This is a bit too low for a complex L<DBIx::Class> application, so on connection
1051 the client side setting is set to C<256> (see L<DBD::Sybase/maxConnect>.) You
1052 can override it to whatever setting you like in the DSN.
1055 L<http://infocenter.sybase.com/help/index.jsp?topic=/com.sybase.help.ase_15.0.sag1/html/sag1/sag1272.htm>
1056 for information on changing the setting on the server side.
1060 See L</connect_call_datetime_setup> to setup date formats
1061 for L<DBIx::Class::InflateColumn::DateTime>.
1063 =head1 TEXT/IMAGE COLUMNS
1065 L<DBD::Sybase> compiled with FreeTDS will B<NOT> allow you to insert or update
1066 C<TEXT/IMAGE> columns.
1068 Setting C<< $dbh->{LongReadLen} >> will also not work with FreeTDS use either:
1070 $schema->storage->dbh->do("SET TEXTSIZE $bytes");
1074 $schema->storage->set_textsize($bytes);
1078 However, the C<LongReadLen> you pass in
1079 L<DBIx::Class::Storage::DBI/connect_info> is used to execute the equivalent
1080 C<SET TEXTSIZE> command on connection.
1082 See L</connect_call_blob_setup> for a L<DBIx::Class::Storage::DBI/connect_info>
1083 setting you need to work with C<IMAGE> columns.
1087 The experimental L<DBD::Sybase> Bulk API support is used for
1088 L<populate|DBIx::Class::ResultSet/populate> in B<void> context, in a transaction
1089 on a separate connection.
1091 To use this feature effectively, use a large number of rows for each
1092 L<populate|DBIx::Class::ResultSet/populate> call, eg.:
1094 while (my $rows = $data_source->get_100_rows()) {
1095 $rs->populate($rows);
1098 B<NOTE:> the L<add_columns|DBIx::Class::ResultSource/add_columns>
1099 calls in your C<Result> classes B<must> list columns in database order for this
1100 to work. Also, you may have to unset the C<LANG> environment variable before
1101 loading your app, if it doesn't match the character set of your database.
1103 When inserting IMAGE columns using this method, you'll need to use
1104 L</connect_call_blob_setup> as well.
1112 Transitions to AutoCommit=0 (starting a transaction) mode by exhausting
1113 any active cursors, using eager cursors.
1117 Real limits and limited counts using stored procedures deployed on startup.
1121 Adaptive Server Anywhere (ASA) support, with possible SQLA::Limit support.
1125 Blob update with a LIKE query on a blob, without invalidating the WHERE condition.
1129 bulk_insert using prepare_cached (see comments.)
1135 See L<DBIx::Class/CONTRIBUTORS>.
1139 You may distribute this code under the same terms as Perl itself.