1 package DBIx::Class::Storage::DBI::Sybase::ASE;
7 DBIx::Class::Storage::DBI::Sybase
8 DBIx::Class::Storage::DBI::AutoCast
9 DBIx::Class::Storage::DBI::IdentityInsert
12 use DBIx::Class::Carp;
13 use Scalar::Util qw/blessed weaken/;
14 use List::Util 'first';
16 use Data::Dumper::Concise 'Dumper';
18 use Context::Preserve 'preserve_context';
19 use DBIx::Class::_Util 'sigwarn_silencer';
22 __PACKAGE__->sql_limit_dialect ('GenericSubQ');
23 __PACKAGE__->sql_quote_char ([qw/[ ]/]);
24 __PACKAGE__->datetime_parser_type(
25 'DBIx::Class::Storage::DBI::Sybase::ASE::DateTime::Format'
28 __PACKAGE__->mk_group_accessors('simple' =>
29 qw/_identity _identity_method _blob_log_on_update _parent_storage
30 _writer_storage _is_writer_storage
31 _bulk_storage _is_bulk_storage _began_bulk_work
36 my @also_proxy_to_extra_storages = qw/
37 connect_call_set_auto_cast auto_cast connect_call_blob_setup
38 connect_call_datetime_setup
40 disconnect _connect_info _sql_maker _sql_maker_opts disable_sth_caching
41 auto_savepoint unsafe cursor_class debug debugobj schema
46 DBIx::Class::Storage::DBI::Sybase::ASE - Sybase ASE SQL Server support for
51 This subclass supports L<DBD::Sybase> for real (non-Microsoft) Sybase databases.
55 If your version of Sybase does not support placeholders, then your storage will
56 be reblessed to L<DBIx::Class::Storage::DBI::Sybase::ASE::NoBindVars>.
57 You can also enable that driver explicitly, see the documentation for more
60 With this driver there is unfortunately no way to get the C<last_insert_id>
61 without doing a C<SELECT MAX(col)>. This is done safely in a transaction
62 (locking the table.) See L</INSERTS WITH PLACEHOLDERS>.
64 A recommended L<connect_info|DBIx::Class::Storage::DBI/connect_info> setting:
66 on_connect_call => [['datetime_setup'], ['blob_setup', log_on_update => 0]]
75 my $no_bind_vars = __PACKAGE__ . '::NoBindVars';
77 if ($self->_using_freetds) {
78 carp_once <<'EOF' unless $ENV{DBIC_SYBASE_FREETDS_NOWARN};
80 You are using FreeTDS with Sybase.
82 We will do our best to support this configuration, but please consider this
85 TEXT/IMAGE columns will definitely not work.
87 You are encouraged to recompile DBD::Sybase with the Sybase Open Client libraries
90 See perldoc DBIx::Class::Storage::DBI::Sybase::ASE for more details.
92 To turn off this warning set the DBIC_SYBASE_FREETDS_NOWARN environment
96 if (not $self->_use_typeless_placeholders) {
97 if ($self->_use_placeholders) {
101 $self->ensure_class_loaded($no_bind_vars);
102 bless $self, $no_bind_vars;
108 elsif (not $self->_get_dbh->{syb_dynamic_supported}) {
109 # not necessarily FreeTDS, but no placeholders nevertheless
110 $self->ensure_class_loaded($no_bind_vars);
111 bless $self, $no_bind_vars;
114 # this is highly unlikely, but we check just in case
115 elsif (not $self->_use_typeless_placeholders) {
123 $self->next::method(@_);
125 if ($self->_using_freetds && (my $ver = $self->_using_freetds_version||999) > 0.82) {
127 "Buggy FreeTDS version $ver detected, statement caching will not work and "
128 . 'will be disabled.'
130 $self->disable_sth_caching(1);
133 $self->_set_max_connect(256);
135 # create storage for insert/(update blob) transactions,
136 # unless this is that storage
137 return if $self->_parent_storage;
139 my $writer_storage = (ref $self)->new;
141 $writer_storage->_is_writer_storage(1); # just info
142 $writer_storage->connect_info($self->connect_info);
143 $writer_storage->auto_cast($self->auto_cast);
145 weaken ($writer_storage->{_parent_storage} = $self);
146 $self->_writer_storage($writer_storage);
148 # create a bulk storage unless connect_info is a coderef
149 return if ref($self->_dbi_connect_info->[0]) eq 'CODE';
151 my $bulk_storage = (ref $self)->new;
153 $bulk_storage->_is_bulk_storage(1); # for special ->disconnect acrobatics
154 $bulk_storage->connect_info($self->connect_info);
157 $bulk_storage->_dbi_connect_info->[0] .= ';bulkLogin=1';
159 weaken ($bulk_storage->{_parent_storage} = $self);
160 $self->_bulk_storage($bulk_storage);
163 for my $method (@also_proxy_to_extra_storages) {
165 no warnings 'redefine';
167 my $replaced = __PACKAGE__->can($method);
169 *{$method} = Sub::Name::subname $method => sub {
171 $self->_writer_storage->$replaced(@_) if $self->_writer_storage;
172 $self->_bulk_storage->$replaced(@_) if $self->_bulk_storage;
173 return $self->$replaced(@_);
180 # Even though we call $sth->finish for uses off the bulk API, there's still an
181 # "active statement" warning on disconnect, which we throw away here.
182 # This is due to the bug described in _insert_bulk.
183 # Currently a noop because 'prepare' is used instead of 'prepare_cached'.
184 local $SIG{__WARN__} = sigwarn_silencer(qr/active statement/i)
185 if $self->_is_bulk_storage;
187 # so that next transaction gets a dbh
188 $self->_began_bulk_work(0) if $self->_is_bulk_storage;
193 # This is only invoked for FreeTDS drivers by ::Storage::DBI::Sybase::FreeTDS
194 sub _set_autocommit_stmt {
195 my ($self, $on) = @_;
197 return 'SET CHAINED ' . ($on ? 'OFF' : 'ON');
200 # Set up session settings for Sybase databases for the connection.
202 # Make sure we have CHAINED mode turned on if AutoCommit is off in non-FreeTDS
203 # DBD::Sybase (since we don't know how DBD::Sybase was compiled.) If however
204 # we're using FreeTDS, CHAINED mode turns on an implicit transaction which we
205 # only want when AutoCommit is off.
206 sub _run_connection_actions {
209 if ($self->_is_bulk_storage) {
210 # this should be cleared on every reconnect
211 $self->_began_bulk_work(0);
215 $self->_dbh->{syb_chained_txn} = 1
216 unless $self->_using_freetds;
218 $self->next::method(@_);
221 =head2 connect_call_blob_setup
225 on_connect_call => [ [ 'blob_setup', log_on_update => 0 ] ]
227 Does C<< $dbh->{syb_binary_images} = 1; >> to return C<IMAGE> data as raw binary
228 instead of as a hex string.
232 Also sets the C<log_on_update> value for blob write operations. The default is
233 C<1>, but C<0> is better if your database is configured for it.
236 L<DBD::Sybase/Handling IMAGE/TEXT data with syb_ct_get_data()/syb_ct_send_data()>.
240 sub connect_call_blob_setup {
243 my $dbh = $self->_dbh;
244 $dbh->{syb_binary_images} = 1;
246 $self->_blob_log_on_update($args{log_on_update})
247 if exists $args{log_on_update};
251 my ($self, $source, $column) = @_;
253 return $self->_is_lob_type($source->column_info($column)->{data_type});
256 sub _prep_for_execute {
257 my ($self, $op, $ident, $args) = @_;
259 my $limit; # extract and use shortcut on limit without offset
260 if ($op eq 'select' and ! $args->[4] and $limit = $args->[3]) {
265 my ($sql, $bind) = $self->next::method($op, $ident, $args);
267 # $limit is already sanitized by now
269 "SET ROWCOUNT $limit",
274 if (my $identity_col = $self->_perform_autoinc_retrieval) {
275 $sql .= "\n" . $self->_fetch_identity_sql($ident, $identity_col)
278 return ($sql, $bind);
281 sub _fetch_identity_sql {
282 my ($self, $source, $col) = @_;
284 return sprintf ("SELECT MAX(%s) FROM %s",
285 map { $self->sql_maker->_quote ($_) } ($col, $source->from)
289 # Stolen from SQLT, with some modifications. This is a makeshift
290 # solution before a sane type-mapping library is available, thus
291 # the 'our' for easy overrides.
292 our %TYPE_MAPPING = (
295 varchar => 'varchar',
296 varchar2 => 'varchar',
297 timestamp => 'datetime',
299 real => 'double precision',
302 tinyint => 'smallint',
303 float => 'double precision',
305 bigserial => 'numeric',
306 boolean => 'varchar',
310 sub _native_data_type {
311 my ($self, $type) = @_;
314 $type =~ s/\s* identity//x;
316 return uc($TYPE_MAPPING{$type} || $type);
322 my ($rv, $sth, @bind) = $self->next::method(@_);
324 $self->_identity( ($sth->fetchall_arrayref)->[0][0] )
325 if $self->_perform_autoinc_retrieval;
327 return wantarray ? ($rv, $sth, @bind) : $rv;
330 sub last_insert_id { shift->_identity }
332 # handles TEXT/IMAGE and transaction for last_insert_id
335 my ($source, $to_insert) = @_;
337 my $columns_info = $source->columns_info;
339 my ($identity_col) = grep
340 { $columns_info->{$_}{is_auto_increment} }
344 $identity_col = '' if ! defined $identity_col;
346 # FIXME - this is duplication from DBI.pm. When refactored towards
347 # the LobWriter this can be folded back where it belongs.
348 local $self->{_autoinc_supplied_for_op} = exists $to_insert->{$identity_col}
353 local $self->{_perform_autoinc_retrieval} = $self->{_autoinc_supplied_for_op}
358 # check for empty insert
359 # INSERT INTO foo DEFAULT VALUES -- does not work with Sybase
360 # try to insert explicit 'DEFAULT's instead (except for identity, timestamp
361 # and computed columns)
362 if (not %$to_insert) {
363 for my $col ($source->columns) {
364 next if $col eq $identity_col;
366 my $info = $source->column_info($col);
368 next if ref $info->{default_value} eq 'SCALAR'
369 || (exists $info->{data_type} && (not defined $info->{data_type}));
371 next if $info->{data_type} && $info->{data_type} =~ /^timestamp\z/i;
373 $to_insert->{$col} = \'DEFAULT';
377 my $blob_cols = $self->_remove_blob_cols($source, $to_insert);
379 # do we need the horrific SELECT MAX(COL) hack?
380 my $need_dumb_last_insert_id = (
381 $self->_perform_autoinc_retrieval
383 ( ($self->_identity_method||'') ne '@@IDENTITY' )
386 my $next = $self->next::can;
388 # we are already in a transaction, or there are no blobs
389 # and we don't need the PK - just (try to) do it
391 ( !$blob_cols and !$need_dumb_last_insert_id )
393 $self->transaction_depth
396 $next, $source, $to_insert, $blob_cols, $identity_col
399 # otherwise use the _writer_storage to do the insert+transaction on another
402 my $guard = $self->_writer_storage->txn_scope_guard;
404 my $updated_cols = $self->_writer_storage->_insert (
405 $next, $source, $to_insert, $blob_cols, $identity_col
408 $self->_identity($self->_writer_storage->_identity);
417 my ($self, $next, $source, $to_insert, $blob_cols, $identity_col) = @_;
419 my $updated_cols = $self->$next ($source, $to_insert);
421 $self->_insert_blobs (
426 ? ( $identity_col => $self->last_insert_id($source, $identity_col) )
434 return $updated_cols;
439 my ($source, $fields, $where, @rest) = @_;
442 # When *updating* identities, ASE requires SET IDENTITY_UPDATE called
444 if (my $blob_cols = $self->_remove_blob_cols($source, $fields)) {
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.
460 $self->next::method($source, \%blobs_to_empty, $where, @rest);
462 # Now update the blobs before the other columns in case the update of other
463 # columns makes the search condition invalid.
464 my $rv = $self->_update_blobs($source, $blob_cols, $where);
468 # Now set the identity update flags for the actual update
469 local $self->{_autoinc_supplied_for_op} = (first
470 { $_->{is_auto_increment} }
471 values %{ $source->columns_info([ keys %$fields ]) }
474 my $next = $self->next::can;
476 return preserve_context {
477 $self->$next(@$args);
478 } after => sub { $guard->commit };
486 # Set the identity update flags for the actual update
487 local $self->{_autoinc_supplied_for_op} = (first
488 { $_->{is_auto_increment} }
489 values %{ $source->columns_info([ keys %$fields ]) }
492 return $self->next::method(@_);
498 my ($source, $cols, $data) = @_;
500 my $columns_info = $source->columns_info;
503 first { $columns_info->{$_}{is_auto_increment} }
506 # FIXME - this is duplication from DBI.pm. When refactored towards
507 # the LobWriter this can be folded back where it belongs.
508 local $self->{_autoinc_supplied_for_op} =
509 (first { $_ eq $identity_col } @$cols)
515 $self->_bulk_storage &&
516 $self->_get_dbh->{syb_has_blk};
518 if (! $use_bulk_api and ref($self->_dbi_connect_info->[0]) eq 'CODE') {
519 carp_unique( join ' ',
520 'Bulk API support disabled due to use of a CODEREF connect_info.',
521 'Reverting to regular array inserts.',
525 if (not $use_bulk_api) {
526 my $blob_cols = $self->_remove_blob_cols_array($source, $cols, $data);
528 # next::method uses a txn anyway, but it ends too early in case we need to
529 # select max(col) to get the identity for inserting blobs.
530 ($self, my $guard) = $self->transaction_depth
532 : ($self->_writer_storage, $self->_writer_storage->txn_scope_guard)
535 $self->next::method(@_);
538 if ($self->_autoinc_supplied_for_op) {
539 $self->_insert_blobs_array ($source, $blob_cols, $cols, $data);
542 my @cols_with_identities = (@$cols, $identity_col);
544 ## calculate identities
545 # XXX This assumes identities always increase by 1, which may or may not
547 my ($last_identity) =
548 $self->_dbh->selectrow_array (
549 $self->_fetch_identity_sql($source, $identity_col)
551 my @identities = (($last_identity - @$data + 1) .. $last_identity);
553 my @data_with_identities = map [@$_, shift @identities], @$data;
555 $self->_insert_blobs_array (
556 $source, $blob_cols, \@cols_with_identities, \@data_with_identities
561 $guard->commit if $guard;
566 # otherwise, use the bulk API
568 # rearrange @$data so that columns are in database order
569 # and so we submit a full column list
570 my %orig_order = map { $cols->[$_] => $_ } 0..$#$cols;
572 my @source_columns = $source->columns;
574 # bcp identity index is 1-based
575 my $identity_idx = first { $source_columns[$_] eq $identity_col } (0..$#source_columns);
576 $identity_idx = defined $identity_idx ? $identity_idx + 1 : 0;
579 for my $slice_idx (0..$#$data) {
580 push @new_data, [map {
581 # identity data will be 'undef' if not _autoinc_supplied_for_op()
582 # columns with defaults will also be 'undef'
583 exists $orig_order{$_}
584 ? $data->[$slice_idx][$orig_order{$_}]
589 my $proto_bind = $self->_resolve_bindattrs(
592 [ { dbic_colname => $source_columns[$_], _bind_data_slice_idx => $_ }
593 => $new_data[0][$_] ]
594 } (0 ..$#source_columns) ],
598 ## Set a client-side conversion error handler, straight from DBD::Sybase docs.
599 # This ignores any data conversion errors detected by the client side libs, as
600 # they are usually harmless.
601 my $orig_cslib_cb = DBD::Sybase::set_cslib_cb(
602 Sub::Name::subname _insert_bulk_cslib_errhandler => sub {
603 my ($layer, $origin, $severity, $errno, $errmsg, $osmsg, $blkmsg) = @_;
605 return 1 if $errno == 36;
608 "Layer: $layer, Origin: $origin, Severity: $severity, Error: $errno" .
609 ($errmsg ? "\n$errmsg" : '') .
610 ($osmsg ? "\n$osmsg" : '') .
611 ($blkmsg ? "\n$blkmsg" : '');
618 my $bulk = $self->_bulk_storage;
620 my $guard = $bulk->txn_scope_guard;
622 ## FIXME - once this is done - address the FIXME on finish() below
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 => $self->_autoinc_supplied_for_op ? 1 : 0,
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 => $self->_autoinc_supplied_for_op ? 1 : 0,
645 identity_column => $identity_idx,
651 # FIXME the $sth->finish in _execute_array does a rollback for some
652 # reason. Disable it temporarily until we fix the SQLMaker thing above
653 no warnings 'redefine';
655 local *{ref($sth).'::finish'} = sub {};
657 $self->_dbh_execute_for_fetch(
658 $source, $sth, $proto_bind, \@source_columns, \@new_data
664 $bulk->_query_end($sql);
669 DBD::Sybase::set_cslib_cb($orig_cslib_cb);
671 if ($exception =~ /-Y option/) {
672 my $w = 'Sybase bulk API operation failed due to character set incompatibility, '
673 . 'reverting to regular array inserts. Try unsetting the LC_ALL environment variable'
675 $w .= "\n$exception" if $self->debug;
678 $self->_bulk_storage(undef);
683 # rollback makes the bulkLogin connection unusable
684 $self->_bulk_storage->disconnect;
685 $self->throw_exception($exception);
689 # Make sure blobs are not bound as placeholders, and return any non-empty ones
691 sub _remove_blob_cols {
692 my ($self, $source, $fields) = @_;
696 for my $col (keys %$fields) {
697 if ($self->_is_lob_column($source, $col)) {
698 my $blob_val = delete $fields->{$col};
699 if (not defined $blob_val) {
700 $fields->{$col} = \'NULL';
703 $fields->{$col} = \"''";
704 $blob_cols{$col} = $blob_val unless $blob_val eq '';
709 return %blob_cols ? \%blob_cols : undef;
712 # same for _insert_bulk
713 sub _remove_blob_cols_array {
714 my ($self, $source, $cols, $data) = @_;
718 for my $i (0..$#$cols) {
719 my $col = $cols->[$i];
721 if ($self->_is_lob_column($source, $col)) {
722 for my $j (0..$#$data) {
723 my $blob_val = delete $data->[$j][$i];
724 if (not defined $blob_val) {
725 $data->[$j][$i] = \'NULL';
728 $data->[$j][$i] = \"''";
729 $blob_cols[$j][$i] = $blob_val
730 unless $blob_val eq '';
736 return @blob_cols ? \@blob_cols : undef;
740 my ($self, $source, $blob_cols, $where) = @_;
742 my @primary_cols = try
743 { $source->_pri_cols_or_die }
745 $self->throw_exception("Cannot update TEXT/IMAGE column(s): $_")
752 ! grep { ! defined $where->{$_} } @primary_cols
755 @row_to_update{@primary_cols} = @{$where}{@primary_cols};
756 @pks_to_update = \%row_to_update;
759 my $cursor = $self->select ($source, \@primary_cols, $where, {});
760 @pks_to_update = map {
761 my %row; @row{@primary_cols} = @$_; \%row
765 for my $ident (@pks_to_update) {
766 $self->_insert_blobs($source, $blob_cols, $ident);
771 my ($self, $source, $blob_cols, $row_data) = @_;
773 my $table = $source->name;
775 my @primary_cols = try
776 { $source->_pri_cols_or_die }
778 $self->throw_exception("Cannot update TEXT/IMAGE column(s): $_")
781 $self->throw_exception('Cannot update TEXT/IMAGE column(s) without primary key values')
782 if grep { ! defined $row_data->{$_} } @primary_cols;
784 my %where = map {( $_ => $row_data->{$_} )} @primary_cols;
786 for my $col (keys %$blob_cols) {
787 my $blob = $blob_cols->{$col};
789 my $cursor = $self->select ($source, [$col], \%where, {});
791 my $sth = $cursor->sth;
794 $self->throw_exception(
795 "Could not find row in table '$table' for blob update:\n"
802 $sth->func('CS_GET', 1, 'ct_data_info') or die $sth->errstr;
805 $sth->func('ct_prepare_send') or die $sth->errstr;
807 my $log_on_update = $self->_blob_log_on_update;
808 $log_on_update = 1 if not defined $log_on_update;
810 $sth->func('CS_SET', 1, {
811 total_txtlen => length($blob),
812 log_on_update => $log_on_update
813 }, 'ct_data_info') or die $sth->errstr;
815 $sth->func($blob, length($blob), 'ct_send_data') or die $sth->errstr;
817 $sth->func('ct_finish_send') or die $sth->errstr;
820 if ($self->_using_freetds) {
821 $self->throw_exception (
822 "TEXT/IMAGE operation failed, probably because you are using FreeTDS: $_"
826 $self->throw_exception($_);
830 $sth->finish if $sth;
835 sub _insert_blobs_array {
836 my ($self, $source, $blob_cols, $cols, $data) = @_;
838 for my $i (0..$#$data) {
839 my $datum = $data->[$i];
842 @row{ @$cols } = @$datum;
845 for my $j (0..$#$cols) {
846 if (exists $blob_cols->[$i][$j]) {
847 $blob_vals{ $cols->[$j] } = $blob_cols->[$i][$j];
851 $self->_insert_blobs ($source, \%blob_vals, \%row);
855 =head2 connect_call_datetime_setup
859 on_connect_call => 'datetime_setup'
861 In L<connect_info|DBIx::Class::Storage::DBI/connect_info> to set:
863 $dbh->syb_date_fmt('ISO_strict'); # output fmt: 2004-08-21T14:36:48.080Z
864 $dbh->do('set dateformat mdy'); # input fmt: 08/13/1979 18:08:55.080
866 This works for both C<DATETIME> and C<SMALLDATETIME> columns, note that
867 C<SMALLDATETIME> columns only have minute precision.
871 sub connect_call_datetime_setup {
873 my $dbh = $self->_get_dbh;
875 if ($dbh->can('syb_date_fmt')) {
876 # amazingly, this works with FreeTDS
877 $dbh->syb_date_fmt('ISO_strict');
881 'Your DBD::Sybase is too old to support '
882 .'DBIx::Class::InflateColumn::DateTime, please upgrade!';
884 # FIXME - in retrospect this is a rather bad US-centric choice
885 # of format. Not changing as a bugwards compat, though in reality
886 # the only piece that sees the results of $dt object formatting
887 # (as opposed to parsing) is the database itself, so theoretically
888 # changing both this SET command and the formatter definition of
889 # ::S::D::Sybase::ASE::DateTime::Format below should be safe and
892 $dbh->do('SET DATEFORMAT mdy');
897 sub _exec_txn_begin {
900 # bulkLogin=1 connections are always in a transaction, and can only call BEGIN
901 # TRAN once. However, we need to make sure there's a $dbh.
902 return if $self->_is_bulk_storage && $self->_dbh && $self->_began_bulk_work;
904 $self->next::method(@_);
906 $self->_began_bulk_work(1) if $self->_is_bulk_storage;
909 # savepoint support using ASE syntax
911 sub _exec_svp_begin {
912 my ($self, $name) = @_;
914 $self->_dbh->do("SAVE TRANSACTION $name");
917 # A new SAVE TRANSACTION with the same name releases the previous one.
918 sub _exec_svp_release { 1 }
920 sub _exec_svp_rollback {
921 my ($self, $name) = @_;
923 $self->_dbh->do("ROLLBACK TRANSACTION $name");
926 package # hide from PAUSE
927 DBIx::Class::Storage::DBI::Sybase::ASE::DateTime::Format;
929 my $datetime_parse_format = '%Y-%m-%dT%H:%M:%S.%3NZ';
930 my $datetime_format_format = '%m/%d/%Y %H:%M:%S.%3N';
932 my ($datetime_parser, $datetime_formatter);
936 require DateTime::Format::Strptime;
937 $datetime_parser ||= DateTime::Format::Strptime->new(
938 pattern => $datetime_parse_format,
941 return $datetime_parser->parse_datetime(shift);
944 sub format_datetime {
946 require DateTime::Format::Strptime;
947 $datetime_formatter ||= DateTime::Format::Strptime->new(
948 pattern => $datetime_format_format,
951 return $datetime_formatter->format_datetime(shift);
956 =head1 Schema::Loader Support
958 As of version C<0.05000>, L<DBIx::Class::Schema::Loader> should work well with
959 most versions of Sybase ASE.
963 This driver supports L<DBD::Sybase> compiled against FreeTDS
964 (L<http://www.freetds.org/>) to the best of our ability, however it is
965 recommended that you recompile L<DBD::Sybase> against the Sybase Open Client
966 libraries. They are a part of the Sybase ASE distribution:
968 The Open Client FAQ is here:
969 L<http://www.isug.com/Sybase_FAQ/ASE/section7.html>.
971 Sybase ASE for Linux (which comes with the Open Client libraries) may be
972 downloaded here: L<http://response.sybase.com/forms/ASE_Linux_Download>.
974 To see if you're using FreeTDS run:
976 perl -MDBI -le 'my $dbh = DBI->connect($dsn, $user, $pass); print $dbh->{syb_oc_version}'
978 It is recommended to set C<tds version> for your ASE server to C<5.0> in
979 C</etc/freetds/freetds.conf>.
981 Some versions or configurations of the libraries involved will not support
982 placeholders, in which case the storage will be reblessed to
983 L<DBIx::Class::Storage::DBI::Sybase::ASE::NoBindVars>.
985 In some configurations, placeholders will work but will throw implicit type
986 conversion errors for anything that's not expecting a string. In such a case,
987 the C<auto_cast> option from L<DBIx::Class::Storage::DBI::AutoCast> is
988 automatically set, which you may enable on connection with
989 L<connect_call_set_auto_cast|DBIx::Class::Storage::DBI::AutoCast/connect_call_set_auto_cast>.
990 The type info for the C<CAST>s is taken from the
991 L<DBIx::Class::ResultSource/data_type> definitions in your Result classes, and
992 are mapped to a Sybase type (if it isn't already) using a mapping based on
995 In other configurations, placeholders will work just as they do with the Sybase
996 Open Client libraries.
998 Inserts or updates of TEXT/IMAGE columns will B<NOT> work with FreeTDS.
1000 =head1 INSERTS WITH PLACEHOLDERS
1002 With placeholders enabled, inserts are done in a transaction so that there are
1003 no concurrency issues with getting the inserted identity value using
1004 C<SELECT MAX(col)>, which is the only way to get the C<IDENTITY> value in this
1007 In addition, they are done on a separate connection so that it's possible to
1008 have active cursors when doing an insert.
1010 When using C<DBIx::Class::Storage::DBI::Sybase::ASE::NoBindVars> transactions
1011 are unnecessary and not used, as there are no concurrency issues with C<SELECT
1012 @@IDENTITY> which is a session variable.
1016 Due to limitations of the TDS protocol and L<DBD::Sybase>, you cannot begin a
1017 transaction while there are active cursors, nor can you use multiple active
1018 cursors within a transaction. An active cursor is, for example, a
1019 L<ResultSet|DBIx::Class::ResultSet> that has been executed using C<next> or
1020 C<first> but has not been exhausted or L<reset|DBIx::Class::ResultSet/reset>.
1022 For example, this will not work:
1024 $schema->txn_do(sub {
1025 my $rs = $schema->resultset('Book');
1026 while (my $result = $rs->next) {
1027 $schema->resultset('MetaData')->create({
1028 book_id => $result->id,
1036 my $first_row = $large_rs->first;
1037 $schema->txn_do(sub { ... });
1039 Transactions done for inserts in C<AutoCommit> mode when placeholders are in use
1040 are not affected, as they are done on an extra database handle.
1046 =item * use L<DBIx::Class::Storage::DBI::Replicated>
1048 =item * L<connect|DBIx::Class::Schema/connect> another L<Schema|DBIx::Class::Schema>
1050 =item * load the data from your cursor with L<DBIx::Class::ResultSet/all>
1054 =head1 MAXIMUM CONNECTIONS
1056 The TDS protocol makes separate connections to the server for active statements
1057 in the background. By default the number of such connections is limited to 25,
1058 on both the client side and the server side.
1060 This is a bit too low for a complex L<DBIx::Class> application, so on connection
1061 the client side setting is set to C<256> (see L<DBD::Sybase/maxConnect>.) You
1062 can override it to whatever setting you like in the DSN.
1065 L<http://infocenter.sybase.com/help/index.jsp?topic=/com.sybase.help.ase_15.0.sag1/html/sag1/sag1272.htm>
1066 for information on changing the setting on the server side.
1070 See L</connect_call_datetime_setup> to setup date formats
1071 for L<DBIx::Class::InflateColumn::DateTime>.
1073 =head1 LIMITED QUERIES
1075 Because ASE does not have a good way to limit results in SQL that works for
1076 all types of queries, the limit dialect is set to
1077 L<GenericSubQ|DBIx::Class::SQLMaker::LimitDialects/GenericSubQ>.
1079 Fortunately, ASE and L<DBD::Sybase> support cursors properly, so when
1080 L<GenericSubQ|DBIx::Class::SQLMaker::LimitDialects/GenericSubQ> is too slow
1081 you can use the L<software_limit|DBIx::Class::ResultSet/software_limit>
1082 L<DBIx::Class::ResultSet> attribute to simulate limited queries by skipping
1085 =head1 TEXT/IMAGE COLUMNS
1087 L<DBD::Sybase> compiled with FreeTDS will B<NOT> allow you to insert or update
1088 C<TEXT/IMAGE> columns.
1090 Setting C<< $dbh->{LongReadLen} >> will also not work with FreeTDS use either:
1092 $schema->storage->dbh->do("SET TEXTSIZE $bytes");
1096 $schema->storage->set_textsize($bytes);
1100 However, the C<LongReadLen> you pass in
1101 L<connect_info|DBIx::Class::Storage::DBI/connect_info> is used to execute the
1102 equivalent C<SET TEXTSIZE> command on connection.
1104 See L</connect_call_blob_setup> for a
1105 L<connect_info|DBIx::Class::Storage::DBI/connect_info> setting you need to work
1106 with C<IMAGE> columns.
1110 The experimental L<DBD::Sybase> Bulk API support is used for
1111 L<populate|DBIx::Class::ResultSet/populate> in B<void> context, in a transaction
1112 on a separate connection.
1114 To use this feature effectively, use a large number of rows for each
1115 L<populate|DBIx::Class::ResultSet/populate> call, eg.:
1117 while (my $rows = $data_source->get_100_rows()) {
1118 $rs->populate($rows);
1121 B<NOTE:> the L<add_columns|DBIx::Class::ResultSource/add_columns>
1122 calls in your C<Result> classes B<must> list columns in database order for this
1123 to work. Also, you may have to unset the C<LC_ALL> environment variable before
1124 loading your app, as C<BCP -Y> is not yet supported in DBD::Sybase .
1126 When inserting IMAGE columns using this method, you'll need to use
1127 L</connect_call_blob_setup> as well.
1129 =head1 COMPUTED COLUMNS
1131 If you have columns such as:
1133 created_dtm AS getdate()
1135 represent them in your Result classes as:
1139 default_value => \'getdate()',
1141 inflate_datetime => 1,
1144 The C<data_type> must exist and must be C<undef>. Then empty inserts will work
1145 on tables with such columns.
1147 =head1 TIMESTAMP COLUMNS
1149 C<timestamp> columns in Sybase ASE are not really timestamps, see:
1150 L<http://dba.fyicenter.com/Interview-Questions/SYBASE/The_timestamp_datatype_in_Sybase_.html>.
1152 They should be defined in your Result classes as:
1155 data_type => 'timestamp',
1157 inflate_datetime => 0,
1160 The C<<inflate_datetime => 0>> is necessary if you use
1161 L<DBIx::Class::InflateColumn::DateTime>, and most people do, and still want to
1162 be able to read these values.
1164 The values will come back as hexadecimal.
1172 Transitions to AutoCommit=0 (starting a transaction) mode by exhausting
1173 any active cursors, using eager cursors.
1177 Real limits and limited counts using stored procedures deployed on startup.
1181 Blob update with a LIKE query on a blob, without invalidating the WHERE condition.
1185 bulk_insert using prepare_cached (see comments.)
1189 =head1 FURTHER QUESTIONS?
1191 Check the list of L<additional DBIC resources|DBIx::Class/GETTING HELP/SUPPORT>.
1193 =head1 COPYRIGHT AND LICENSE
1195 This module is free software L<copyright|DBIx::Class/COPYRIGHT AND LICENSE>
1196 by the L<DBIx::Class (DBIC) authors|DBIx::Class/AUTHORS>. You can
1197 redistribute it and/or modify it under the same terms as the
1198 L<DBIx::Class library|DBIx::Class/COPYRIGHT AND LICENSE>.