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/;
15 __PACKAGE__->mk_group_accessors('simple' =>
16 qw/_identity _blob_log_on_update _writer_storage _is_extra_storage
17 _bulk_storage _is_bulk_storage _began_bulk_work
18 _bulk_disabled_due_to_coderef_connect_info_warned
22 my @also_proxy_to_extra_storages = qw/
23 connect_call_set_auto_cast auto_cast connect_call_blob_setup
24 connect_call_datetime_setup
26 disconnect _connect_info _sql_maker _sql_maker_opts disable_sth_caching
27 auto_savepoint unsafe cursor_class debug debugobj schema
32 DBIx::Class::Storage::DBI::Sybase - Sybase support for DBIx::Class
36 This subclass supports L<DBD::Sybase> for real Sybase databases. If you are
37 using an MSSQL database via L<DBD::Sybase>, your storage will be reblessed to
38 L<DBIx::Class::Storage::DBI::Sybase::Microsoft_SQL_Server>.
42 If your version of Sybase does not support placeholders, then your storage
43 will be reblessed to L<DBIx::Class::Storage::DBI::Sybase::NoBindVars>. You can
44 also enable that driver explicitly, see the documentation for more details.
46 With this driver there is unfortunately no way to get the C<last_insert_id>
47 without doing a C<SELECT MAX(col)>. This is done safely in a transaction
48 (locking the table.) See L</INSERTS WITH PLACEHOLDERS>.
50 A recommended L<DBIx::Class::Storage::DBI/connect_info> setting:
52 on_connect_call => [['datetime_setup'], ['blob_setup', log_on_update => 0]]
61 if (ref($self) eq 'DBIx::Class::Storage::DBI::Sybase') {
63 @{$self->_get_dbh->selectrow_arrayref(qq{sp_server_info \@attribute_id=1})}[2]
68 my $subclass = "DBIx::Class::Storage::DBI::Sybase::${dbtype}";
70 if (!$exception && $dbtype && $self->load_optional_class($subclass)) {
71 bless $self, $subclass;
73 } else { # real Sybase
74 my $no_bind_vars = 'DBIx::Class::Storage::DBI::Sybase::NoBindVars';
76 if ($self->using_freetds) {
77 carp <<'EOF' unless $ENV{DBIC_SYBASE_FREETDS_NOWARN};
79 You are using FreeTDS with Sybase.
81 We will do our best to support this configuration, but please consider this
84 TEXT/IMAGE columns will definitely not work.
86 You are encouraged to recompile DBD::Sybase with the Sybase Open Client libraries
89 See perldoc DBIx::Class::Storage::DBI::Sybase for more details.
91 To turn off this warning set the DBIC_SYBASE_FREETDS_NOWARN environment
94 if (not $self->_typeless_placeholders_supported) {
95 if ($self->_placeholders_supported) {
98 $self->ensure_class_loaded($no_bind_vars);
99 bless $self, $no_bind_vars;
104 elsif (not $self->_get_dbh->{syb_dynamic_supported}) {
105 # not necessarily FreeTDS, but no placeholders nevertheless
106 $self->ensure_class_loaded($no_bind_vars);
107 bless $self, $no_bind_vars;
109 } elsif (not $self->_typeless_placeholders_supported) {
110 # this is highly unlikely, but we check just in case
119 $self->_set_max_connect(256);
121 # based on LongReadLen in connect_info
122 $self->set_textsize if $self->using_freetds;
124 # create storage for insert/(update blob) transactions,
125 # unless this is that storage
126 return if $self->_is_extra_storage;
128 my $writer_storage = (ref $self)->new;
130 $writer_storage->_is_extra_storage(1);
131 $writer_storage->connect_info($self->connect_info);
132 $writer_storage->auto_cast($self->auto_cast);
134 $self->_writer_storage($writer_storage);
136 # create a bulk storage unless connect_info is a coderef
138 if (Scalar::Util::reftype($self->_dbi_connect_info->[0])||'') eq 'CODE';
140 my $bulk_storage = (ref $self)->new;
142 $bulk_storage->_is_extra_storage(1);
143 $bulk_storage->_is_bulk_storage(1); # for special ->disconnect acrobatics
144 $bulk_storage->connect_info($self->connect_info);
147 $bulk_storage->_dbi_connect_info->[0] .= ';bulkLogin=1';
149 $self->_bulk_storage($bulk_storage);
152 for my $method (@also_proxy_to_extra_storages) {
154 no warnings 'redefine';
156 my $replaced = __PACKAGE__->can($method);
158 *{$method} = Sub::Name::subname $method => sub {
160 $self->_writer_storage->$replaced(@_) if $self->_writer_storage;
161 $self->_bulk_storage->$replaced(@_) if $self->_bulk_storage;
162 return $self->$replaced(@_);
169 # Even though we call $sth->finish for uses off the bulk API, there's still an
170 # "active statement" warning on disconnect, which we throw away here.
171 # This is due to the bug described in insert_bulk.
172 # Currently a noop because 'prepare' is used instead of 'prepare_cached'.
173 local $SIG{__WARN__} = sub {
174 warn $_[0] unless $_[0] =~ /active statement/i;
175 } if $self->_is_bulk_storage;
177 # so that next transaction gets a dbh
178 $self->_began_bulk_work(0) if $self->_is_bulk_storage;
183 # Make sure we have CHAINED mode turned on if AutoCommit is off in non-FreeTDS
184 # DBD::Sybase (since we don't know how DBD::Sybase was compiled.) If however
185 # we're using FreeTDS, CHAINED mode turns on an implicit transaction which we
186 # only want when AutoCommit is off.
190 $self->next::method(@_);
192 if ($self->_is_bulk_storage) {
193 # this should be cleared on every reconnect
194 $self->_began_bulk_work(0);
198 if (not $self->using_freetds) {
199 $self->_dbh->{syb_chained_txn} = 1;
201 if ($self->_dbh_autocommit) {
202 $self->_dbh->do('SET CHAINED OFF');
204 $self->_dbh->do('SET CHAINED ON');
209 =head2 connect_call_blob_setup
213 on_connect_call => [ [ 'blob_setup', log_on_update => 0 ] ]
215 Does C<< $dbh->{syb_binary_images} = 1; >> to return C<IMAGE> data as raw binary
216 instead of as a hex string.
220 Also sets the C<log_on_update> value for blob write operations. The default is
221 C<1>, but C<0> is better if your database is configured for it.
224 L<DBD::Sybase/Handling_IMAGE/TEXT_data_with_syb_ct_get_data()/syb_ct_send_data()>.
228 sub connect_call_blob_setup {
231 my $dbh = $self->_dbh;
232 $dbh->{syb_binary_images} = 1;
234 $self->_blob_log_on_update($args{log_on_update})
235 if exists $args{log_on_update};
241 $type && $type =~ /(?:text|image|lob|bytea|binary|memo)/i;
245 my ($self, $source, $column) = @_;
247 return $self->_is_lob_type($source->column_info($column)->{data_type});
250 sub _prep_for_execute {
252 my ($op, $extra_bind, $ident, $args) = @_;
254 my ($sql, $bind) = $self->next::method (@_);
256 if ($op eq 'insert') {
257 my $table = $ident->from;
259 my $bind_info = $self->_resolve_column_info(
260 $ident, [map $_->[0], @{$bind}]
262 my $identity_col = List::Util::first
263 { $bind_info->{$_}{is_auto_increment} }
269 "SET IDENTITY_INSERT $table ON",
271 "SET IDENTITY_INSERT $table OFF",
275 $identity_col = List::Util::first
276 { $ident->column_info($_)->{is_auto_increment} }
284 $self->_fetch_identity_sql($ident, $identity_col);
288 return ($sql, $bind);
291 # Stolen from SQLT, with some modifications. This is a makeshift
292 # solution before a sane type-mapping library is available, thus
293 # the 'our' for easy overrides.
294 our %TYPE_MAPPING = (
297 varchar => 'varchar',
298 varchar2 => 'varchar',
299 timestamp => 'datetime',
301 real => 'double precision',
304 tinyint => 'smallint',
305 float => 'double precision',
307 bigserial => 'numeric',
308 boolean => 'varchar',
312 sub _native_data_type {
313 my ($self, $type) = @_;
316 $type =~ s/\s* identity//x;
318 return uc($TYPE_MAPPING{$type} || $type);
321 sub _fetch_identity_sql {
322 my ($self, $source, $col) = @_;
324 return sprintf ("SELECT MAX(%s) FROM %s",
325 map { $self->sql_maker->_quote ($_) } ($col, $source->from)
333 my ($rv, $sth, @bind) = $self->dbh_do($self->can('_dbh_execute'), @_);
335 if ($op eq 'insert') {
336 $self->_identity($sth->fetchrow_array);
340 return wantarray ? ($rv, $sth, @bind) : $rv;
343 sub last_insert_id { shift->_identity }
345 # handles TEXT/IMAGE and transaction for last_insert_id
348 my ($source, $to_insert) = @_;
350 my $blob_cols = $self->_remove_blob_cols($source, $to_insert);
352 my $identity_col = List::Util::first
353 { $source->column_info($_)->{is_auto_increment} }
356 # do we need the horrific SELECT MAX(COL) hack?
357 my $dumb_last_insert_id =
359 && (not exists $to_insert->{$identity_col})
360 && ($self->_identity_method||'') ne '@@IDENTITY';
362 my $next = $self->next::can;
364 # we are already in a transaction, or there are no blobs
365 # and we don't need the PK - just (try to) do it
366 if ($self->{transaction_depth}
367 || (!$blob_cols && !$dumb_last_insert_id)
369 return $self->_insert (
370 $next, $source, $to_insert, $blob_cols, $identity_col
374 # otherwise use the _writer_storage to do the insert+transaction on another
376 my $guard = $self->_writer_storage->txn_scope_guard;
378 my $updated_cols = $self->_writer_storage->_insert (
379 $next, $source, $to_insert, $blob_cols, $identity_col
382 $self->_identity($self->_writer_storage->_identity);
386 return $updated_cols;
390 my ($self, $next, $source, $to_insert, $blob_cols, $identity_col) = @_;
392 my $updated_cols = $self->$next ($source, $to_insert);
395 $identity_col => $self->last_insert_id($source, $identity_col),
400 $self->_insert_blobs ($source, $blob_cols, $final_row) if $blob_cols;
402 return $updated_cols;
407 my ($source, $fields, $where, @rest) = @_;
409 my $wantarray = wantarray;
411 my $blob_cols = $self->_remove_blob_cols($source, $fields);
413 my $table = $source->name;
415 my $identity_col = List::Util::first
416 { $source->column_info($_)->{is_auto_increment} }
419 my $is_identity_update = $identity_col && defined $fields->{$identity_col};
421 if (not $blob_cols) {
422 $self->_set_session_identity(UPDATE => $table, 'ON')
423 if $is_identity_update;
425 return $self->next::method(@_);
427 $self->_set_session_identity(UPDATE => $table, 'OFF')
428 if $is_identity_update;
431 # If there are any blobs in $where, Sybase will return a descriptive error
434 # update+blob update(s) done atomically on separate connection
435 $self = $self->_writer_storage;
437 my $guard = $self->txn_scope_guard;
439 # First update the blob columns to be updated to '' (taken from $fields, where
440 # it is originally put by _remove_blob_cols .)
441 my %blobs_to_empty = map { ($_ => delete $fields->{$_}) } keys %$blob_cols;
443 $self->next::method($source, \%blobs_to_empty, $where, @rest);
445 # Now update the blobs before the other columns in case the update of other
446 # columns makes the search condition invalid.
447 $self->_update_blobs($source, $blob_cols, $where);
451 $self->_set_session_identity(UPDATE => $table, 'ON')
452 if $is_identity_update;
455 @res = $self->next::method(@_);
457 elsif (defined $wantarray) {
458 $res[0] = $self->next::method(@_);
461 $self->next::method(@_);
464 $self->_set_session_identity(UPDATE => $table, 'OFF')
465 if $is_identity_update;
470 return $wantarray ? @res : $res[0];
473 # for IDENTITY_INSERT / IDENTITY_UPDATE
474 sub _set_session_identity {
475 my ($self, $op, $table, $off_on) = @_;
478 'SET IDENTITY_%s %s %s',
480 $self->sql_maker->_quote($table),
484 $self->_query_start($sql);
486 my $dbh = $self->_get_dbh;
488 local $dbh->{RaiseError} = 1;
489 local $dbh->{PrintError} = 0;
494 $self->_query_end($sql);
497 $self->throw_exception (sprintf "Error executing '%s': %s",
506 my ($source, $cols, $data) = @_;
508 my $identity_col = List::Util::first
509 { $source->column_info($_)->{is_auto_increment} }
512 my $is_identity_insert = (List::Util::first
513 { $source->column_info ($_)->{is_auto_increment} }
517 my @source_columns = $source->columns;
520 $self->_bulk_storage &&
521 $self->_get_dbh->{syb_has_blk};
523 if ((not $use_bulk_api) &&
524 (Scalar::Util::reftype($self->_dbi_connect_info->[0])||'') eq 'CODE' &&
525 (not $self->_bulk_disabled_due_to_coderef_connect_info_warned)) {
527 Bulk API support disabled due to use of a CODEREF connect_info. Reverting to
530 $self->_bulk_disabled_due_to_coderef_connect_info_warned(1);
533 if (not $use_bulk_api) {
534 my $blob_cols = $self->_remove_blob_cols_array($source, $cols, $data);
536 ($self, my ($guard)) = do {
537 if ($self->{transaction_depth} == 0 && $blob_cols) {
538 ($self->_writer_storage, $self->_writer_storage->txn_scope_guard);
545 $self->next::method(@_);
548 if ($is_identity_insert) {
549 $self->_insert_blobs_array ($source, $blob_cols, $cols, $data);
552 my @cols_with_identities = (@$cols, $identity_col);
554 ## calculate identities
555 # XXX This assumes identities always increase by 1, which may or may not
557 my ($last_identity) =
558 $self->_dbh->selectrow_array (
559 $self->_fetch_identity_sql($source, $identity_col)
561 my @identities = (($last_identity - @$data + 1) .. $last_identity);
563 my @data_with_identities = map [@$_, shift @identities], @$data;
565 $self->_insert_blobs_array (
566 $source, $blob_cols, \@cols_with_identities, \@data_with_identities
571 $guard->commit if $guard;
575 # otherwise, use the bulk API
577 # rearrange @$data so that columns are in database order
579 @orig_idx{@$cols} = 0..$#$cols;
582 @new_idx{@source_columns} = 0..$#source_columns;
585 for my $datum (@$data) {
587 for my $col (@source_columns) {
588 # identity data will be 'undef' if not $is_identity_insert
589 # columns with defaults will also be 'undef'
590 $new_datum->[ $new_idx{$col} ] =
591 exists $orig_idx{$col} ? $datum->[ $orig_idx{$col} ] : undef;
593 push @new_data, $new_datum;
596 # bcp identity index is 1-based
597 my $identity_idx = exists $new_idx{$identity_col} ?
598 $new_idx{$identity_col} + 1 : 0;
600 ## Set a client-side conversion error handler, straight from DBD::Sybase docs.
601 # This ignores any data conversion errors detected by the client side libs, as
602 # they are usually harmless.
603 my $orig_cslib_cb = DBD::Sybase::set_cslib_cb(
604 Sub::Name::subname insert_bulk => sub {
605 my ($layer, $origin, $severity, $errno, $errmsg, $osmsg, $blkmsg) = @_;
607 return 1 if $errno == 36;
610 "Layer: $layer, Origin: $origin, Severity: $severity, Error: $errno" .
611 ($errmsg ? "\n$errmsg" : '') .
612 ($osmsg ? "\n$osmsg" : '') .
613 ($blkmsg ? "\n$blkmsg" : '');
619 my $bulk = $self->_bulk_storage;
621 my $guard = $bulk->txn_scope_guard;
623 ## XXX get this to work instead of our own $sth
624 ## will require SQLA or *Hacks changes for ordered columns
625 # $bulk->next::method($source, \@source_columns, \@new_data, {
626 # syb_bcp_attribs => {
627 # identity_flag => $is_identity_insert,
628 # identity_column => $identity_idx,
631 my $sql = 'INSERT INTO ' .
632 $bulk->sql_maker->_quote($source->name) . ' (' .
633 # colname list is ignored for BCP, but does no harm
634 (join ', ', map $bulk->sql_maker->_quote($_), @source_columns) . ') '.
635 ' VALUES ('. (join ', ', ('?') x @source_columns) . ')';
637 ## XXX there's a bug in the DBD::Sybase bulk support that makes $sth->finish for
638 ## a prepare_cached statement ineffective. Replace with ->sth when fixed, or
639 ## better yet the version above. Should be fixed in DBD::Sybase .
640 my $sth = $bulk->_get_dbh->prepare($sql,
644 identity_flag => $is_identity_insert,
645 identity_column => $identity_idx,
650 my $bind_attributes = $self->source_bind_attributes($source);
652 foreach my $slice_idx (0..$#source_columns) {
653 my $col = $source_columns[$slice_idx];
655 my $attributes = $bind_attributes->{$col}
656 if $bind_attributes && defined $bind_attributes->{$col};
658 my @slice = map $_->[$slice_idx], @new_data;
660 $sth->bind_param_array(($slice_idx + 1), \@slice, $attributes);
663 $bulk->_query_start($sql);
665 # this is stolen from DBI::insert_bulk
666 my $tuple_status = [];
667 my $rv = eval { $sth->execute_array({ArrayTupleStatus => $tuple_status}) };
669 if (my $err = $@ || $sth->errstr) {
671 ++$i while $i <= $#$tuple_status && !ref $tuple_status->[$i];
673 $self->throw_exception("Unexpected populate error: $err")
674 if ($i > $#$tuple_status);
676 $self->throw_exception(sprintf "%s for populate slice:\n%s",
677 ($tuple_status->[$i][1] || $err),
678 $self->_pretty_print ({
679 map { $source_columns[$_] => $new_data[$i][$_] } (0 .. $#$cols)
687 $bulk->_query_end($sql);
690 if ($exception =~ /-Y option/) {
693 Sybase bulk API operation failed due to character set incompatibility, reverting
694 to regular array inserts:
696 *** Try unsetting the LANG environment variable.
700 $self->_bulk_storage(undef);
701 DBD::Sybase::set_cslib_cb($orig_cslib_cb);
706 DBD::Sybase::set_cslib_cb($orig_cslib_cb);
707 # rollback makes the bulkLogin connection unusable
708 $self->_bulk_storage->disconnect;
709 $self->throw_exception($exception);
712 DBD::Sybase::set_cslib_cb($orig_cslib_cb);
715 # Make sure blobs are not bound as placeholders, and return any non-empty ones
717 sub _remove_blob_cols {
718 my ($self, $source, $fields) = @_;
722 for my $col (keys %$fields) {
723 if ($self->_is_lob_type($source->column_info($col)->{data_type})) {
724 my $blob_val = delete $fields->{$col};
725 if (not defined $blob_val) {
726 $fields->{$col} = \'NULL';
729 $fields->{$col} = \"''";
730 $blob_cols{$col} = $blob_val unless $blob_val eq '';
735 return keys %blob_cols ? \%blob_cols : undef;
738 # same for insert_bulk
739 sub _remove_blob_cols_array {
740 my ($self, $source, $cols, $data) = @_;
744 for my $i (0..$#$cols) {
745 my $col = $cols->[$i];
747 if ($self->_is_lob_type($source->column_info($col)->{data_type})) {
748 for my $j (0..$#$data) {
749 my $blob_val = delete $data->[$j][$i];
750 if (not defined $blob_val) {
751 $data->[$j][$i] = \'NULL';
754 $data->[$j][$i] = \"''";
755 $blob_cols[$j][$i] = $blob_val
756 unless $blob_val eq '';
762 return @blob_cols ? \@blob_cols : undef;
766 my ($self, $source, $blob_cols, $where) = @_;
768 my (@primary_cols) = $source->primary_columns;
770 $self->throw_exception('Cannot update TEXT/IMAGE column(s) without a primary key')
771 unless @primary_cols;
773 # check if we're updating a single row by PK
774 my $pk_cols_in_where = 0;
775 for my $col (@primary_cols) {
776 $pk_cols_in_where++ if defined $where->{$col};
780 if ($pk_cols_in_where == @primary_cols) {
782 @row_to_update{@primary_cols} = @{$where}{@primary_cols};
783 @rows = \%row_to_update;
785 my $cursor = $self->select ($source, \@primary_cols, $where, {});
787 my %row; @row{@primary_cols} = @$_; \%row
791 for my $row (@rows) {
792 $self->_insert_blobs($source, $blob_cols, $row);
797 my ($self, $source, $blob_cols, $row) = @_;
798 my $dbh = $self->_get_dbh;
800 my $table = $source->name;
803 my (@primary_cols) = $source->primary_columns;
805 $self->throw_exception('Cannot update TEXT/IMAGE column(s) without a primary key')
806 unless @primary_cols;
808 $self->throw_exception('Cannot update TEXT/IMAGE column(s) without primary key values')
809 if ((grep { defined $row{$_} } @primary_cols) != @primary_cols);
811 for my $col (keys %$blob_cols) {
812 my $blob = $blob_cols->{$col};
814 my %where = map { ($_, $row{$_}) } @primary_cols;
816 my $cursor = $self->select ($source, [$col], \%where, {});
818 my $sth = $cursor->sth;
822 $self->throw_exception(
823 "Could not find row in table '$table' for blob update:\n"
824 . $self->_pretty_print (\%where)
830 $sth->func('CS_GET', 1, 'ct_data_info') or die $sth->errstr;
833 $sth->func('ct_prepare_send') or die $sth->errstr;
835 my $log_on_update = $self->_blob_log_on_update;
836 $log_on_update = 1 if not defined $log_on_update;
838 $sth->func('CS_SET', 1, {
839 total_txtlen => length($blob),
840 log_on_update => $log_on_update
841 }, 'ct_data_info') or die $sth->errstr;
843 $sth->func($blob, length($blob), 'ct_send_data') or die $sth->errstr;
845 $sth->func('ct_finish_send') or die $sth->errstr;
848 $sth->finish if $sth;
850 if ($self->using_freetds) {
851 $self->throw_exception (
852 'TEXT/IMAGE operation failed, probably because you are using FreeTDS: '
856 $self->throw_exception($exception);
862 sub _insert_blobs_array {
863 my ($self, $source, $blob_cols, $cols, $data) = @_;
865 for my $i (0..$#$data) {
866 my $datum = $data->[$i];
869 @row{ @$cols } = @$datum;
872 for my $j (0..$#$cols) {
873 if (exists $blob_cols->[$i][$j]) {
874 $blob_vals{ $cols->[$j] } = $blob_cols->[$i][$j];
878 $self->_insert_blobs ($source, \%blob_vals, \%row);
882 =head2 connect_call_datetime_setup
886 on_connect_call => 'datetime_setup'
888 In L<DBIx::Class::Storage::DBI/connect_info> to set:
890 $dbh->syb_date_fmt('ISO_strict'); # output fmt: 2004-08-21T14:36:48.080Z
891 $dbh->do('set dateformat mdy'); # input fmt: 08/13/1979 18:08:55.080
893 On connection for use with L<DBIx::Class::InflateColumn::DateTime>, using
894 L<DateTime::Format::Sybase>, which you will need to install.
896 This works for both C<DATETIME> and C<SMALLDATETIME> columns, although
897 C<SMALLDATETIME> columns only have minute precision.
902 my $old_dbd_warned = 0;
904 sub connect_call_datetime_setup {
906 my $dbh = $self->_dbh;
908 if ($dbh->can('syb_date_fmt')) {
909 # amazingly, this works with FreeTDS
910 $dbh->syb_date_fmt('ISO_strict');
911 } elsif (not $old_dbd_warned) {
912 carp "Your DBD::Sybase is too old to support ".
913 "DBIx::Class::InflateColumn::DateTime, please upgrade!";
917 $dbh->do('SET DATEFORMAT mdy');
923 sub datetime_parser_type { "DateTime::Format::Sybase" }
925 # ->begin_work and such have no effect with FreeTDS but we run them anyway to
926 # let the DBD keep any state it needs to.
928 # If they ever do start working, the extra statements will do no harm (because
929 # Sybase supports nested transactions.)
931 sub _dbh_begin_work {
934 # bulkLogin=1 connections are always in a transaction, and can only call BEGIN
935 # TRAN once. However, we need to make sure there's a $dbh.
936 return if $self->_is_bulk_storage && $self->_dbh && $self->_began_bulk_work;
938 $self->next::method(@_);
940 if ($self->using_freetds) {
941 $self->_get_dbh->do('BEGIN TRAN');
944 $self->_began_bulk_work(1) if $self->_is_bulk_storage;
949 if ($self->using_freetds) {
950 $self->_dbh->do('COMMIT');
952 return $self->next::method(@_);
957 if ($self->using_freetds) {
958 $self->_dbh->do('ROLLBACK');
960 return $self->next::method(@_);
963 # savepoint support using ASE syntax
966 my ($self, $name) = @_;
968 $self->_get_dbh->do("SAVE TRANSACTION $name");
971 # A new SAVE TRANSACTION with the same name releases the previous one.
972 sub _svp_release { 1 }
975 my ($self, $name) = @_;
977 $self->_get_dbh->do("ROLLBACK TRANSACTION $name");
982 =head1 Schema::Loader Support
984 There is an experimental branch of L<DBIx::Class::Schema::Loader> that will
985 allow you to dump a schema from most (if not all) versions of Sybase.
987 It is available via subversion from:
989 http://dev.catalyst.perl.org/repos/bast/branches/DBIx-Class-Schema-Loader/current/
993 This driver supports L<DBD::Sybase> compiled against FreeTDS
994 (L<http://www.freetds.org/>) to the best of our ability, however it is
995 recommended that you recompile L<DBD::Sybase> against the Sybase Open Client
996 libraries. They are a part of the Sybase ASE distribution:
998 The Open Client FAQ is here:
999 L<http://www.isug.com/Sybase_FAQ/ASE/section7.html>.
1001 Sybase ASE for Linux (which comes with the Open Client libraries) may be
1002 downloaded here: L<http://response.sybase.com/forms/ASE_Linux_Download>.
1004 To see if you're using FreeTDS check C<< $schema->storage->using_freetds >>, or run:
1006 perl -MDBI -le 'my $dbh = DBI->connect($dsn, $user, $pass); print $dbh->{syb_oc_version}'
1008 Some versions of the libraries involved will not support placeholders, in which
1009 case the storage will be reblessed to
1010 L<DBIx::Class::Storage::DBI::Sybase::NoBindVars>.
1012 In some configurations, placeholders will work but will throw implicit type
1013 conversion errors for anything that's not expecting a string. In such a case,
1014 the C<auto_cast> option from L<DBIx::Class::Storage::DBI::AutoCast> is
1015 automatically set, which you may enable on connection with
1016 L<DBIx::Class::Storage::DBI::AutoCast/connect_call_set_auto_cast>. The type info
1017 for the C<CAST>s is taken from the L<DBIx::Class::ResultSource/data_type>
1018 definitions in your Result classes, and are mapped to a Sybase type (if it isn't
1019 already) using a mapping based on L<SQL::Translator>.
1021 In other configurations, placeholers will work just as they do with the Sybase
1022 Open Client libraries.
1024 Inserts or updates of TEXT/IMAGE columns will B<NOT> work with FreeTDS.
1026 =head1 INSERTS WITH PLACEHOLDERS
1028 With placeholders enabled, inserts are done in a transaction so that there are
1029 no concurrency issues with getting the inserted identity value using
1030 C<SELECT MAX(col)>, which is the only way to get the C<IDENTITY> value in this
1033 In addition, they are done on a separate connection so that it's possible to
1034 have active cursors when doing an insert.
1036 When using C<DBIx::Class::Storage::DBI::Sybase::NoBindVars> transactions are
1037 disabled, as there are no concurrency issues with C<SELECT @@IDENTITY> as it's a
1042 Due to limitations of the TDS protocol, L<DBD::Sybase>, or both; you cannot
1043 begin a transaction while there are active cursors; nor can you use multiple
1044 active cursors within a transaction. An active cursor is, for example, a
1045 L<ResultSet|DBIx::Class::ResultSet> that has been executed using C<next> or
1046 C<first> but has not been exhausted or L<reset|DBIx::Class::ResultSet/reset>.
1048 For example, this will not work:
1050 $schema->txn_do(sub {
1051 my $rs = $schema->resultset('Book');
1052 while (my $row = $rs->next) {
1053 $schema->resultset('MetaData')->create({
1054 book_id => $row->id,
1062 my $first_row = $large_rs->first;
1063 $schema->txn_do(sub { ... });
1065 Transactions done for inserts in C<AutoCommit> mode when placeholders are in use
1066 are not affected, as they are done on an extra database handle.
1072 =item * use L<DBIx::Class::Storage::DBI::Replicated>
1074 =item * L<connect|DBIx::Class::Schema/connect> another L<Schema|DBIx::Class::Schema>
1076 =item * load the data from your cursor with L<DBIx::Class::ResultSet/all>
1080 =head1 MAXIMUM CONNECTIONS
1082 The TDS protocol makes separate connections to the server for active statements
1083 in the background. By default the number of such connections is limited to 25,
1084 on both the client side and the server side.
1086 This is a bit too low for a complex L<DBIx::Class> application, so on connection
1087 the client side setting is set to C<256> (see L<DBD::Sybase/maxConnect>.) You
1088 can override it to whatever setting you like in the DSN.
1091 L<http://infocenter.sybase.com/help/index.jsp?topic=/com.sybase.help.ase_15.0.sag1/html/sag1/sag1272.htm>
1092 for information on changing the setting on the server side.
1096 See L</connect_call_datetime_setup> to setup date formats
1097 for L<DBIx::Class::InflateColumn::DateTime>.
1099 =head1 TEXT/IMAGE COLUMNS
1101 L<DBD::Sybase> compiled with FreeTDS will B<NOT> allow you to insert or update
1102 C<TEXT/IMAGE> columns.
1104 Setting C<< $dbh->{LongReadLen} >> will also not work with FreeTDS use either:
1106 $schema->storage->dbh->do("SET TEXTSIZE $bytes");
1110 $schema->storage->set_textsize($bytes);
1114 However, the C<LongReadLen> you pass in
1115 L<DBIx::Class::Storage::DBI/connect_info> is used to execute the equivalent
1116 C<SET TEXTSIZE> command on connection.
1118 See L</connect_call_blob_setup> for a L<DBIx::Class::Storage::DBI/connect_info>
1119 setting you need to work with C<IMAGE> columns.
1123 The experimental L<DBD::Sybase> Bulk API support is used for
1124 L<populate|DBIx::Class::ResultSet/populate> in B<void> context, in a transaction
1125 on a separate connection.
1127 To use this feature effectively, use a large number of rows for each
1128 L<populate|DBIx::Class::ResultSet/populate> call, eg.:
1130 while (my $rows = $data_source->get_100_rows()) {
1131 $rs->populate($rows);
1134 B<NOTE:> the L<add_columns|DBIx::Class::ResultSource/add_columns>
1135 calls in your C<Result> classes B<must> list columns in database order for this
1136 to work. Also, you may have to unset the C<LANG> environment variable before
1137 loading your app, if it doesn't match the character set of your database.
1139 When inserting IMAGE columns using this method, you'll need to use
1140 L</connect_call_blob_setup> as well.
1144 See L<DBIx::Class/CONTRIBUTORS>.
1148 You may distribute this code under the same terms as Perl itself.