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 my $table = Scalar::Util::blessed($ident) ? $ident->from : $ident;
258 my $bind_info = $self->_resolve_column_info(
259 $ident, [map $_->[0], @{$bind}]
261 my $bound_identity_col = List::Util::first
262 { $bind_info->{$_}{is_auto_increment} }
265 my $identity_col = Scalar::Util::blessed($ident) &&
267 { $ident->column_info($_)->{is_auto_increment} }
271 if (($op eq 'insert' && $bound_identity_col) ||
272 ($op eq 'update' && exists $args->[0]{$identity_col})) {
274 $self->_set_table_identity_sql($op => $table, 'on'),
276 $self->_set_table_identity_sql($op => $table, 'off'),
280 if ($op eq 'insert' && (not $bound_identity_col) && $identity_col) {
283 $self->_fetch_identity_sql($ident, $identity_col);
286 return ($sql, $bind);
289 sub _set_table_identity_sql {
290 my ($self, $op, $table, $on_off) = @_;
292 return sprintf 'SET IDENTITY_%s %s %s',
293 uc($op), $self->sql_maker->_quote($table), uc($on_off);
296 # Stolen from SQLT, with some modifications. This is a makeshift
297 # solution before a sane type-mapping library is available, thus
298 # the 'our' for easy overrides.
299 our %TYPE_MAPPING = (
302 varchar => 'varchar',
303 varchar2 => 'varchar',
304 timestamp => 'datetime',
306 real => 'double precision',
309 tinyint => 'smallint',
310 float => 'double precision',
312 bigserial => 'numeric',
313 boolean => 'varchar',
317 sub _native_data_type {
318 my ($self, $type) = @_;
321 $type =~ s/\s* identity//x;
323 return uc($TYPE_MAPPING{$type} || $type);
326 sub _fetch_identity_sql {
327 my ($self, $source, $col) = @_;
329 return sprintf ("SELECT MAX(%s) FROM %s",
330 map { $self->sql_maker->_quote ($_) } ($col, $source->from)
338 my ($rv, $sth, @bind) = $self->dbh_do($self->can('_dbh_execute'), @_);
340 if ($op eq 'insert') {
341 $self->_identity($sth->fetchrow_array);
345 return wantarray ? ($rv, $sth, @bind) : $rv;
348 sub last_insert_id { shift->_identity }
350 # handles TEXT/IMAGE and transaction for last_insert_id
353 my ($source, $to_insert) = @_;
355 my $identity_col = (List::Util::first
356 { $source->column_info($_)->{is_auto_increment} }
357 $source->columns) || '';
359 # check for empty insert
360 # INSERT INTO foo DEFAULT VALUES -- does not work with Sybase
361 # try to insert explicit 'DEFAULT's instead (except for identity)
362 if (not %$to_insert) {
363 for my $col ($source->columns) {
364 next if $col eq $identity_col;
365 $to_insert->{$col} = \'DEFAULT';
369 my $blob_cols = $self->_remove_blob_cols($source, $to_insert);
371 # do we need the horrific SELECT MAX(COL) hack?
372 my $dumb_last_insert_id =
374 && (not exists $to_insert->{$identity_col})
375 && ($self->_identity_method||'') ne '@@IDENTITY';
377 my $next = $self->next::can;
379 # we are already in a transaction, or there are no blobs
380 # and we don't need the PK - just (try to) do it
381 if ($self->{transaction_depth}
382 || (!$blob_cols && !$dumb_last_insert_id)
384 return $self->_insert (
385 $next, $source, $to_insert, $blob_cols, $identity_col
389 # otherwise use the _writer_storage to do the insert+transaction on another
391 my $guard = $self->_writer_storage->txn_scope_guard;
393 my $updated_cols = $self->_writer_storage->_insert (
394 $next, $source, $to_insert, $blob_cols, $identity_col
397 $self->_identity($self->_writer_storage->_identity);
401 return $updated_cols;
405 my ($self, $next, $source, $to_insert, $blob_cols, $identity_col) = @_;
407 my $updated_cols = $self->$next ($source, $to_insert);
411 ($identity_col => $self->last_insert_id($source, $identity_col)) : ()),
416 $self->_insert_blobs ($source, $blob_cols, $final_row) if $blob_cols;
418 return $updated_cols;
423 my ($source, $fields, $where, @rest) = @_;
425 my $wantarray = wantarray;
427 my $blob_cols = $self->_remove_blob_cols($source, $fields);
429 my $table = $source->name;
431 my $identity_col = List::Util::first
432 { $source->column_info($_)->{is_auto_increment} }
435 my $is_identity_update = $identity_col && defined $fields->{$identity_col};
437 return $self->next::method(@_) unless $blob_cols;
439 # If there are any blobs in $where, Sybase will return a descriptive error
441 # XXX blobs can still be used with a LIKE query, and this should be handled.
443 # update+blob update(s) done atomically on separate connection
444 $self = $self->_writer_storage;
446 my $guard = $self->txn_scope_guard;
448 # First update the blob columns to be updated to '' (taken from $fields, where
449 # it is originally put by _remove_blob_cols .)
450 my %blobs_to_empty = map { ($_ => delete $fields->{$_}) } keys %$blob_cols;
452 # We can't only update NULL blobs, because blobs cannot be in the WHERE clause.
454 $self->next::method($source, \%blobs_to_empty, $where, @rest);
456 # Now update the blobs before the other columns in case the update of other
457 # columns makes the search condition invalid.
458 $self->_update_blobs($source, $blob_cols, $where);
463 @res = $self->next::method(@_);
465 elsif (defined $wantarray) {
466 $res[0] = $self->next::method(@_);
469 $self->next::method(@_);
475 return $wantarray ? @res : $res[0];
480 my ($source, $cols, $data) = @_;
482 my $identity_col = List::Util::first
483 { $source->column_info($_)->{is_auto_increment} }
486 my $is_identity_insert = (List::Util::first
487 { $_ eq $identity_col }
491 my @source_columns = $source->columns;
494 $self->_bulk_storage &&
495 $self->_get_dbh->{syb_has_blk};
497 if ((not $use_bulk_api) &&
498 (Scalar::Util::reftype($self->_dbi_connect_info->[0])||'') eq 'CODE' &&
499 (not $self->_bulk_disabled_due_to_coderef_connect_info_warned)) {
501 Bulk API support disabled due to use of a CODEREF connect_info. Reverting to
502 regular array inserts.
504 $self->_bulk_disabled_due_to_coderef_connect_info_warned(1);
507 if (not $use_bulk_api) {
508 my $blob_cols = $self->_remove_blob_cols_array($source, $cols, $data);
510 my $dumb_last_insert_id =
512 && (not $is_identity_insert)
513 && ($self->_identity_method||'') ne '@@IDENTITY';
515 ($self, my ($guard)) = do {
516 if ($self->{transaction_depth} == 0 && $blob_cols &&
517 $dumb_last_insert_id) {
518 ($self->_writer_storage, $self->_writer_storage->txn_scope_guard);
525 $self->next::method(@_);
528 if ($is_identity_insert) {
529 $self->_insert_blobs_array ($source, $blob_cols, $cols, $data);
532 my @cols_with_identities = (@$cols, $identity_col);
534 ## calculate identities
535 # XXX This assumes identities always increase by 1, which may or may not
537 my ($last_identity) =
538 $self->_dbh->selectrow_array (
539 $self->_fetch_identity_sql($source, $identity_col)
541 my @identities = (($last_identity - @$data + 1) .. $last_identity);
543 my @data_with_identities = map [@$_, shift @identities], @$data;
545 $self->_insert_blobs_array (
546 $source, $blob_cols, \@cols_with_identities, \@data_with_identities
551 $guard->commit if $guard;
555 # otherwise, use the bulk API
557 # rearrange @$data so that columns are in database order
559 @orig_idx{@$cols} = 0..$#$cols;
562 @new_idx{@source_columns} = 0..$#source_columns;
565 for my $datum (@$data) {
567 for my $col (@source_columns) {
568 # identity data will be 'undef' if not $is_identity_insert
569 # columns with defaults will also be 'undef'
570 $new_datum->[ $new_idx{$col} ] =
571 exists $orig_idx{$col} ? $datum->[ $orig_idx{$col} ] : undef;
573 push @new_data, $new_datum;
576 # bcp identity index is 1-based
577 my $identity_idx = exists $new_idx{$identity_col} ?
578 $new_idx{$identity_col} + 1 : 0;
580 ## Set a client-side conversion error handler, straight from DBD::Sybase docs.
581 # This ignores any data conversion errors detected by the client side libs, as
582 # they are usually harmless.
583 my $orig_cslib_cb = DBD::Sybase::set_cslib_cb(
584 Sub::Name::subname insert_bulk => sub {
585 my ($layer, $origin, $severity, $errno, $errmsg, $osmsg, $blkmsg) = @_;
587 return 1 if $errno == 36;
590 "Layer: $layer, Origin: $origin, Severity: $severity, Error: $errno" .
591 ($errmsg ? "\n$errmsg" : '') .
592 ($osmsg ? "\n$osmsg" : '') .
593 ($blkmsg ? "\n$blkmsg" : '');
599 my $bulk = $self->_bulk_storage;
601 my $guard = $bulk->txn_scope_guard;
603 ## XXX get this to work instead of our own $sth
604 ## will require SQLA or *Hacks changes for ordered columns
605 # $bulk->next::method($source, \@source_columns, \@new_data, {
606 # syb_bcp_attribs => {
607 # identity_flag => $is_identity_insert,
608 # identity_column => $identity_idx,
611 my $sql = 'INSERT INTO ' .
612 $bulk->sql_maker->_quote($source->name) . ' (' .
613 # colname list is ignored for BCP, but does no harm
614 (join ', ', map $bulk->sql_maker->_quote($_), @source_columns) . ') '.
615 ' VALUES ('. (join ', ', ('?') x @source_columns) . ')';
617 ## XXX there's a bug in the DBD::Sybase bulk support that makes $sth->finish for
618 ## a prepare_cached statement ineffective. Replace with ->sth when fixed, or
619 ## better yet the version above. Should be fixed in DBD::Sybase .
620 my $sth = $bulk->_get_dbh->prepare($sql,
624 identity_flag => $is_identity_insert,
625 identity_column => $identity_idx,
632 map [ $_, $idx++ ], @source_columns;
635 $self->_execute_array(
636 $source, $sth, \@bind, \@source_columns, \@new_data, $guard
639 $bulk->_query_end($sql);
643 DBD::Sybase::set_cslib_cb($orig_cslib_cb);
645 if ($exception =~ /-Y option/) {
648 Sybase bulk API operation failed due to character set incompatibility, reverting
649 to regular array inserts:
651 *** Try unsetting the LANG environment variable.
655 $self->_bulk_storage(undef);
660 # rollback makes the bulkLogin connection unusable
661 $self->_bulk_storage->disconnect;
662 $self->throw_exception($exception);
666 # Make sure blobs are not bound as placeholders, and return any non-empty ones
668 sub _remove_blob_cols {
669 my ($self, $source, $fields) = @_;
673 for my $col (keys %$fields) {
674 if ($self->_is_lob_column($source, $col)) {
675 my $blob_val = delete $fields->{$col};
676 if (not defined $blob_val) {
677 $fields->{$col} = \'NULL';
680 $fields->{$col} = \"''";
681 $blob_cols{$col} = $blob_val unless $blob_val eq '';
686 return %blob_cols ? \%blob_cols : undef;
689 # same for insert_bulk
690 sub _remove_blob_cols_array {
691 my ($self, $source, $cols, $data) = @_;
695 for my $i (0..$#$cols) {
696 my $col = $cols->[$i];
698 if ($self->_is_lob_column($source, $col)) {
699 for my $j (0..$#$data) {
700 my $blob_val = delete $data->[$j][$i];
701 if (not defined $blob_val) {
702 $data->[$j][$i] = \'NULL';
705 $data->[$j][$i] = \"''";
706 $blob_cols[$j][$i] = $blob_val
707 unless $blob_val eq '';
713 return @blob_cols ? \@blob_cols : undef;
717 my ($self, $source, $blob_cols, $where) = @_;
719 my (@primary_cols) = $source->primary_columns;
721 $self->throw_exception('Cannot update TEXT/IMAGE column(s) without a primary key')
722 unless @primary_cols;
724 # check if we're updating a single row by PK
725 my $pk_cols_in_where = 0;
726 for my $col (@primary_cols) {
727 $pk_cols_in_where++ if defined $where->{$col};
731 if ($pk_cols_in_where == @primary_cols) {
733 @row_to_update{@primary_cols} = @{$where}{@primary_cols};
734 @rows = \%row_to_update;
736 my $cursor = $self->select ($source, \@primary_cols, $where, {});
738 my %row; @row{@primary_cols} = @$_; \%row
742 for my $row (@rows) {
743 $self->_insert_blobs($source, $blob_cols, $row);
748 my ($self, $source, $blob_cols, $row) = @_;
749 my $dbh = $self->_get_dbh;
751 my $table = $source->name;
754 my (@primary_cols) = $source->primary_columns;
756 $self->throw_exception('Cannot update TEXT/IMAGE column(s) without a primary key')
757 unless @primary_cols;
759 $self->throw_exception('Cannot update TEXT/IMAGE column(s) without primary key values')
760 if ((grep { defined $row{$_} } @primary_cols) != @primary_cols);
762 for my $col (keys %$blob_cols) {
763 my $blob = $blob_cols->{$col};
765 my %where = map { ($_, $row{$_}) } @primary_cols;
767 my $cursor = $self->select ($source, [$col], \%where, {});
769 my $sth = $cursor->sth;
773 $self->throw_exception(
774 "Could not find row in table '$table' for blob update:\n"
775 . $self->_pretty_print (\%where)
781 $sth->func('CS_GET', 1, 'ct_data_info') or die $sth->errstr;
784 $sth->func('ct_prepare_send') or die $sth->errstr;
786 my $log_on_update = $self->_blob_log_on_update;
787 $log_on_update = 1 if not defined $log_on_update;
789 $sth->func('CS_SET', 1, {
790 total_txtlen => length($blob),
791 log_on_update => $log_on_update
792 }, 'ct_data_info') or die $sth->errstr;
794 $sth->func($blob, length($blob), 'ct_send_data') or die $sth->errstr;
796 $sth->func('ct_finish_send') or die $sth->errstr;
799 $sth->finish if $sth;
801 if ($self->using_freetds) {
802 $self->throw_exception (
803 'TEXT/IMAGE operation failed, probably because you are using FreeTDS: '
807 $self->throw_exception($exception);
813 sub _insert_blobs_array {
814 my ($self, $source, $blob_cols, $cols, $data) = @_;
816 for my $i (0..$#$data) {
817 my $datum = $data->[$i];
820 @row{ @$cols } = @$datum;
823 for my $j (0..$#$cols) {
824 if (exists $blob_cols->[$i][$j]) {
825 $blob_vals{ $cols->[$j] } = $blob_cols->[$i][$j];
829 $self->_insert_blobs ($source, \%blob_vals, \%row);
833 =head2 connect_call_datetime_setup
837 on_connect_call => 'datetime_setup'
839 In L<DBIx::Class::Storage::DBI/connect_info> to set:
841 $dbh->syb_date_fmt('ISO_strict'); # output fmt: 2004-08-21T14:36:48.080Z
842 $dbh->do('set dateformat mdy'); # input fmt: 08/13/1979 18:08:55.080
844 On connection for use with L<DBIx::Class::InflateColumn::DateTime>, using
845 L<DateTime::Format::Sybase>, which you will need to install.
847 This works for both C<DATETIME> and C<SMALLDATETIME> columns, although
848 C<SMALLDATETIME> columns only have minute precision.
853 my $old_dbd_warned = 0;
855 sub connect_call_datetime_setup {
857 my $dbh = $self->_get_dbh;
859 if ($dbh->can('syb_date_fmt')) {
860 # amazingly, this works with FreeTDS
861 $dbh->syb_date_fmt('ISO_strict');
862 } elsif (not $old_dbd_warned) {
863 carp "Your DBD::Sybase is too old to support ".
864 "DBIx::Class::InflateColumn::DateTime, please upgrade!";
868 $dbh->do('SET DATEFORMAT mdy');
874 sub datetime_parser_type { "DateTime::Format::Sybase" }
876 # ->begin_work and such have no effect with FreeTDS but we run them anyway to
877 # let the DBD keep any state it needs to.
879 # If they ever do start working, the extra statements will do no harm (because
880 # Sybase supports nested transactions.)
882 sub _dbh_begin_work {
885 # bulkLogin=1 connections are always in a transaction, and can only call BEGIN
886 # TRAN once. However, we need to make sure there's a $dbh.
887 return if $self->_is_bulk_storage && $self->_dbh && $self->_began_bulk_work;
889 $self->next::method(@_);
891 if ($self->using_freetds) {
892 $self->_get_dbh->do('BEGIN TRAN');
895 $self->_began_bulk_work(1) if $self->_is_bulk_storage;
900 if ($self->using_freetds) {
901 $self->_dbh->do('COMMIT');
903 return $self->next::method(@_);
908 if ($self->using_freetds) {
909 $self->_dbh->do('ROLLBACK');
911 return $self->next::method(@_);
914 # savepoint support using ASE syntax
917 my ($self, $name) = @_;
919 $self->_get_dbh->do("SAVE TRANSACTION $name");
922 # A new SAVE TRANSACTION with the same name releases the previous one.
923 sub _svp_release { 1 }
926 my ($self, $name) = @_;
928 $self->_get_dbh->do("ROLLBACK TRANSACTION $name");
933 =head1 Schema::Loader Support
935 There is an experimental branch of L<DBIx::Class::Schema::Loader> that will
936 allow you to dump a schema from most (if not all) versions of Sybase.
938 It is available via subversion from:
940 http://dev.catalyst.perl.org/repos/bast/branches/DBIx-Class-Schema-Loader/current/
944 This driver supports L<DBD::Sybase> compiled against FreeTDS
945 (L<http://www.freetds.org/>) to the best of our ability, however it is
946 recommended that you recompile L<DBD::Sybase> against the Sybase Open Client
947 libraries. They are a part of the Sybase ASE distribution:
949 The Open Client FAQ is here:
950 L<http://www.isug.com/Sybase_FAQ/ASE/section7.html>.
952 Sybase ASE for Linux (which comes with the Open Client libraries) may be
953 downloaded here: L<http://response.sybase.com/forms/ASE_Linux_Download>.
955 To see if you're using FreeTDS check C<< $schema->storage->using_freetds >>, or run:
957 perl -MDBI -le 'my $dbh = DBI->connect($dsn, $user, $pass); print $dbh->{syb_oc_version}'
959 Some versions of the libraries involved will not support placeholders, in which
960 case the storage will be reblessed to
961 L<DBIx::Class::Storage::DBI::Sybase::NoBindVars>.
963 In some configurations, placeholders will work but will throw implicit type
964 conversion errors for anything that's not expecting a string. In such a case,
965 the C<auto_cast> option from L<DBIx::Class::Storage::DBI::AutoCast> is
966 automatically set, which you may enable on connection with
967 L<DBIx::Class::Storage::DBI::AutoCast/connect_call_set_auto_cast>. The type info
968 for the C<CAST>s is taken from the L<DBIx::Class::ResultSource/data_type>
969 definitions in your Result classes, and are mapped to a Sybase type (if it isn't
970 already) using a mapping based on L<SQL::Translator>.
972 In other configurations, placeholers will work just as they do with the Sybase
973 Open Client libraries.
975 Inserts or updates of TEXT/IMAGE columns will B<NOT> work with FreeTDS.
977 =head1 INSERTS WITH PLACEHOLDERS
979 With placeholders enabled, inserts are done in a transaction so that there are
980 no concurrency issues with getting the inserted identity value using
981 C<SELECT MAX(col)>, which is the only way to get the C<IDENTITY> value in this
984 In addition, they are done on a separate connection so that it's possible to
985 have active cursors when doing an insert.
987 When using C<DBIx::Class::Storage::DBI::Sybase::NoBindVars> transactions are
988 disabled, as there are no concurrency issues with C<SELECT @@IDENTITY> as it's a
993 Due to limitations of the TDS protocol, L<DBD::Sybase>, or both; you cannot
994 begin a transaction while there are active cursors; nor can you use multiple
995 active cursors within a transaction. An active cursor is, for example, a
996 L<ResultSet|DBIx::Class::ResultSet> that has been executed using C<next> or
997 C<first> but has not been exhausted or L<reset|DBIx::Class::ResultSet/reset>.
999 For example, this will not work:
1001 $schema->txn_do(sub {
1002 my $rs = $schema->resultset('Book');
1003 while (my $row = $rs->next) {
1004 $schema->resultset('MetaData')->create({
1005 book_id => $row->id,
1013 my $first_row = $large_rs->first;
1014 $schema->txn_do(sub { ... });
1016 Transactions done for inserts in C<AutoCommit> mode when placeholders are in use
1017 are not affected, as they are done on an extra database handle.
1023 =item * use L<DBIx::Class::Storage::DBI::Replicated>
1025 =item * L<connect|DBIx::Class::Schema/connect> another L<Schema|DBIx::Class::Schema>
1027 =item * load the data from your cursor with L<DBIx::Class::ResultSet/all>
1031 =head1 MAXIMUM CONNECTIONS
1033 The TDS protocol makes separate connections to the server for active statements
1034 in the background. By default the number of such connections is limited to 25,
1035 on both the client side and the server side.
1037 This is a bit too low for a complex L<DBIx::Class> application, so on connection
1038 the client side setting is set to C<256> (see L<DBD::Sybase/maxConnect>.) You
1039 can override it to whatever setting you like in the DSN.
1042 L<http://infocenter.sybase.com/help/index.jsp?topic=/com.sybase.help.ase_15.0.sag1/html/sag1/sag1272.htm>
1043 for information on changing the setting on the server side.
1047 See L</connect_call_datetime_setup> to setup date formats
1048 for L<DBIx::Class::InflateColumn::DateTime>.
1050 =head1 TEXT/IMAGE COLUMNS
1052 L<DBD::Sybase> compiled with FreeTDS will B<NOT> allow you to insert or update
1053 C<TEXT/IMAGE> columns.
1055 Setting C<< $dbh->{LongReadLen} >> will also not work with FreeTDS use either:
1057 $schema->storage->dbh->do("SET TEXTSIZE $bytes");
1061 $schema->storage->set_textsize($bytes);
1065 However, the C<LongReadLen> you pass in
1066 L<DBIx::Class::Storage::DBI/connect_info> is used to execute the equivalent
1067 C<SET TEXTSIZE> command on connection.
1069 See L</connect_call_blob_setup> for a L<DBIx::Class::Storage::DBI/connect_info>
1070 setting you need to work with C<IMAGE> columns.
1074 The experimental L<DBD::Sybase> Bulk API support is used for
1075 L<populate|DBIx::Class::ResultSet/populate> in B<void> context, in a transaction
1076 on a separate connection.
1078 To use this feature effectively, use a large number of rows for each
1079 L<populate|DBIx::Class::ResultSet/populate> call, eg.:
1081 while (my $rows = $data_source->get_100_rows()) {
1082 $rs->populate($rows);
1085 B<NOTE:> the L<add_columns|DBIx::Class::ResultSource/add_columns>
1086 calls in your C<Result> classes B<must> list columns in database order for this
1087 to work. Also, you may have to unset the C<LANG> environment variable before
1088 loading your app, if it doesn't match the character set of your database.
1090 When inserting IMAGE columns using this method, you'll need to use
1091 L</connect_call_blob_setup> as well.
1099 Transitions to AutoCommit=0 (starting a transaction) mode by exhausting
1100 any active cursors, using eager cursors.
1104 Real limits and limited counts using stored procedures deployed on startup.
1108 Adaptive Server Anywhere (ASA) support, with possible SQLA::Limit support.
1112 Blob update with a LIKE query on a blob, without invalidating the WHERE condition.
1116 bulk_insert using prepare_cached (see comments.)
1122 See L<DBIx::Class/CONTRIBUTORS>.
1126 You may distribute this code under the same terms as Perl itself.