[Bast-commits] r7934 - in DBIx-Class/0.08/branches/sybase_refactor/lib/DBIx/Class/Storage/DBI: . Sybase Sybase/SQL_Server

ribasushi at dev.catalyst.perl.org ribasushi at dev.catalyst.perl.org
Mon Nov 23 00:06:50 GMT 2009


Author: ribasushi
Date: 2009-11-23 00:06:48 +0000 (Mon, 23 Nov 2009)
New Revision: 7934

Added:
   DBIx-Class/0.08/branches/sybase_refactor/lib/DBIx/Class/Storage/DBI/Sybase.pm
   DBIx-Class/0.08/branches/sybase_refactor/lib/DBIx/Class/Storage/DBI/Sybase/SQL_Server.pm
   DBIx-Class/0.08/branches/sybase_refactor/lib/DBIx/Class/Storage/DBI/Sybase/SQL_Server/
   DBIx-Class/0.08/branches/sybase_refactor/lib/DBIx/Class/Storage/DBI/Sybase/SQL_Server/NoBindVars.pm
Removed:
   DBIx-Class/0.08/branches/sybase_refactor/lib/DBIx/Class/Storage/DBI/Sybase.pm
   DBIx-Class/0.08/branches/sybase_refactor/lib/DBIx/Class/Storage/DBI/Sybase/Common.pm
   DBIx-Class/0.08/branches/sybase_refactor/lib/DBIx/Class/Storage/DBI/Sybase/NoBindVars.pm
Log:
refactor part1

Deleted: DBIx-Class/0.08/branches/sybase_refactor/lib/DBIx/Class/Storage/DBI/Sybase/Common.pm
===================================================================
--- DBIx-Class/0.08/branches/sybase_refactor/lib/DBIx/Class/Storage/DBI/Sybase/Common.pm	2009-11-22 23:38:34 UTC (rev 7933)
+++ DBIx-Class/0.08/branches/sybase_refactor/lib/DBIx/Class/Storage/DBI/Sybase/Common.pm	2009-11-23 00:06:48 UTC (rev 7934)
@@ -1,111 +0,0 @@
-package DBIx::Class::Storage::DBI::Sybase::Common;
-
-use strict;
-use warnings;
-
-use base qw/DBIx::Class::Storage::DBI/;
-use mro 'c3';
-
-=head1 NAME
-
-DBIx::Class::Storage::DBI::Sybase::Common - Common functionality for drivers using
-DBD::Sybase
-
-=head1 DESCRIPTION
-
-This is the base class for L<DBIx::Class::Storage::DBI::Sybase> and
-L<DBIx::Class::Storage::DBI::Sybase::Microsoft_SQL_Server>. It provides some
-utility methods related to L<DBD::Sybase> and the supported functions of the
-database you are connecting to.
-
-=head1 METHODS
-
-=cut
-
-sub _ping {
-  my $self = shift;
-
-  my $dbh = $self->_dbh or return 0;
-
-  local $dbh->{RaiseError} = 1;
-  local $dbh->{PrintError} = 0;
-
-  if ($dbh->{syb_no_child_con}) {
-# if extra connections are not allowed, then ->ping is reliable
-    my $ping = eval { $dbh->ping };
-    return $@ ? 0 : $ping;
-  }
-
-  eval {
-# XXX if the main connection goes stale, does opening another for this statement
-# really determine anything?
-    $dbh->do('select 1');
-  };
-
-  return $@ ? 0 : 1;
-}
-
-sub _set_max_connect {
-  my $self = shift;
-  my $val  = shift || 256;
-
-  my $dsn = $self->_dbi_connect_info->[0];
-
-  return if ref($dsn) eq 'CODE';
-
-  if ($dsn !~ /maxConnect=/) {
-    $self->_dbi_connect_info->[0] = "$dsn;maxConnect=$val";
-    my $connected = defined $self->_dbh;
-    $self->disconnect;
-    $self->ensure_connected if $connected;
-  }
-}
-
-=head2 using_freetds
-
-Whether or not L<DBD::Sybase> was compiled against FreeTDS. If false, it means
-the Sybase OpenClient libraries were used.
-
-=cut
-
-sub using_freetds {
-  my $self = shift;
-
-  return $self->_get_dbh->{syb_oc_version} =~ /freetds/i;
-}
-
-=head2 set_textsize
-
-When using FreeTDS and/or MSSQL, C<< $dbh->{LongReadLen} >> is not available,
-use this function instead. It does:
-
-  $dbh->do("SET TEXTSIZE $bytes");
-
-Takes the number of bytes, or uses the C<LongReadLen> value from your
-L<DBIx::Class/connect_info> if omitted, lastly falls back to the C<32768> which
-is the L<DBD::Sybase> default.
-
-=cut
-
-sub set_textsize {
-  my $self = shift;
-  my $text_size = shift ||
-    eval { $self->_dbi_connect_info->[-1]->{LongReadLen} } ||
-    32768; # the DBD::Sybase default
-
-  return unless defined $text_size;
-
-  $self->_dbh->do("SET TEXTSIZE $text_size");
-}
-
-1;
-
-=head1 AUTHORS
-
-See L<DBIx::Class/CONTRIBUTORS>.
-
-=head1 LICENSE
-
-You may distribute this code under the same terms as Perl itself.
-
-=cut

Deleted: DBIx-Class/0.08/branches/sybase_refactor/lib/DBIx/Class/Storage/DBI/Sybase/NoBindVars.pm
===================================================================
--- DBIx-Class/0.08/branches/sybase_refactor/lib/DBIx/Class/Storage/DBI/Sybase/NoBindVars.pm	2009-11-22 23:38:34 UTC (rev 7933)
+++ DBIx-Class/0.08/branches/sybase_refactor/lib/DBIx/Class/Storage/DBI/Sybase/NoBindVars.pm	2009-11-23 00:06:48 UTC (rev 7934)
@@ -1,102 +0,0 @@
-package DBIx::Class::Storage::DBI::Sybase::NoBindVars;
-
-use base qw/
-  DBIx::Class::Storage::DBI::NoBindVars
-  DBIx::Class::Storage::DBI::Sybase
-/;
-use mro 'c3';
-use List::Util ();
-use Scalar::Util ();
-
-sub _init {
-  my $self = shift;
-  $self->disable_sth_caching(1);
-  $self->_identity_method('@@IDENTITY');
-  $self->next::method (@_);
-}
-
-sub _fetch_identity_sql { 'SELECT ' . $_[0]->_identity_method }
-
-my $number = sub { Scalar::Util::looks_like_number($_[0]) };
-
-my $decimal = sub { $_[0] =~ /^ [-+]? \d+ (?:\.\d*)? \z/x };
-
-my %noquote = (
-    int => sub { $_[0] =~ /^ [-+]? \d+ \z/x },
-    bit => => sub { $_[0] =~ /^[01]\z/ },
-    money => sub { $_[0] =~ /^\$ \d+ (?:\.\d*)? \z/x },
-    float => $number,
-    real => $number,
-    double => $number,
-    decimal => $decimal,
-    numeric => $decimal,
-);
-
-sub interpolate_unquoted {
-  my $self = shift;
-  my ($type, $value) = @_;
-
-  return $self->next::method(@_) if not defined $value or not defined $type;
-
-  if (my $key = List::Util::first { $type =~ /$_/i } keys %noquote) {
-    return 1 if $noquote{$key}->($value);
-  }
-  elsif ($self->is_datatype_numeric($type) && $number->($value)) {
-    return 1;
-  }
-
-  return $self->next::method(@_);
-}
-
-sub _prep_interpolated_value {
-  my ($self, $type, $value) = @_;
-
-  if ($type =~ /money/i && defined $value) {
-    # change a ^ not followed by \$ to a \$
-    $value =~ s/^ (?! \$) /\$/x;
-  }
-
-  return $value;
-}
-
-1;
-
-=head1 NAME
-
-DBIx::Class::Storage::DBI::Sybase::NoBindVars - Storage::DBI subclass for Sybase
-without placeholder support
-
-=head1 DESCRIPTION
-
-If you're using this driver than your version of Sybase, or the libraries you
-use to connect to it, do not support placeholders.
-
-You can also enable this driver explicitly using:
-
-  my $schema = SchemaClass->clone;
-  $schema->storage_type('::DBI::Sybase::NoBindVars');
-  $schema->connect($dsn, $user, $pass, \%opts);
-
-See the discussion in L<< DBD::Sybase/Using ? Placeholders & bind parameters to
-$sth->execute >> for details on the pros and cons of using placeholders.
-
-One advantage of not using placeholders is that C<select @@identity> will work
-for obtainging the last insert id of an C<IDENTITY> column, instead of having to
-do C<select max(col)> in a transaction as the base Sybase driver does.
-
-When using this driver, bind variables will be interpolated (properly quoted of
-course) into the SQL query itself, without using placeholders.
-
-The caching of prepared statements is also explicitly disabled, as the
-interpolation renders it useless.
-
-=head1 AUTHORS
-
-See L<DBIx::Class/CONTRIBUTORS>.
-
-=head1 LICENSE
-
-You may distribute this code under the same terms as Perl itself.
-
-=cut
-# vim:sts=2 sw=2:

Copied: DBIx-Class/0.08/branches/sybase_refactor/lib/DBIx/Class/Storage/DBI/Sybase/SQL_Server/NoBindVars.pm (from rev 7933, DBIx-Class/0.08/branches/sybase_refactor/lib/DBIx/Class/Storage/DBI/Sybase/NoBindVars.pm)
===================================================================
--- DBIx-Class/0.08/branches/sybase_refactor/lib/DBIx/Class/Storage/DBI/Sybase/SQL_Server/NoBindVars.pm	                        (rev 0)
+++ DBIx-Class/0.08/branches/sybase_refactor/lib/DBIx/Class/Storage/DBI/Sybase/SQL_Server/NoBindVars.pm	2009-11-23 00:06:48 UTC (rev 7934)
@@ -0,0 +1,102 @@
+package DBIx::Class::Storage::DBI::Sybase::ASE::NoBindVars;
+
+use base qw/
+  DBIx::Class::Storage::DBI::NoBindVars
+  DBIx::Class::Storage::DBI::Sybase::ASE
+/;
+use mro 'c3';
+use List::Util ();
+use Scalar::Util ();
+
+sub _init {
+  my $self = shift;
+  $self->disable_sth_caching(1);
+  $self->_identity_method('@@IDENTITY');
+  $self->next::method (@_);
+}
+
+sub _fetch_identity_sql { 'SELECT ' . $_[0]->_identity_method }
+
+my $number = sub { Scalar::Util::looks_like_number($_[0]) };
+
+my $decimal = sub { $_[0] =~ /^ [-+]? \d+ (?:\.\d*)? \z/x };
+
+my %noquote = (
+    int => sub { $_[0] =~ /^ [-+]? \d+ \z/x },
+    bit => => sub { $_[0] =~ /^[01]\z/ },
+    money => sub { $_[0] =~ /^\$ \d+ (?:\.\d*)? \z/x },
+    float => $number,
+    real => $number,
+    double => $number,
+    decimal => $decimal,
+    numeric => $decimal,
+);
+
+sub interpolate_unquoted {
+  my $self = shift;
+  my ($type, $value) = @_;
+
+  return $self->next::method(@_) if not defined $value or not defined $type;
+
+  if (my $key = List::Util::first { $type =~ /$_/i } keys %noquote) {
+    return 1 if $noquote{$key}->($value);
+  }
+  elsif ($self->is_datatype_numeric($type) && $number->($value)) {
+    return 1;
+  }
+
+  return $self->next::method(@_);
+}
+
+sub _prep_interpolated_value {
+  my ($self, $type, $value) = @_;
+
+  if ($type =~ /money/i && defined $value) {
+    # change a ^ not followed by \$ to a \$
+    $value =~ s/^ (?! \$) /\$/x;
+  }
+
+  return $value;
+}
+
+1;
+
+=head1 NAME
+
+DBIx::Class::Storage::DBI::Sybase::ASE::NoBindVars - Storage::DBI subclass for
+Sybase ASE without placeholder support
+
+=head1 DESCRIPTION
+
+If you're using this driver than your version of Sybase, or the libraries you
+use to connect to it, do not support placeholders.
+
+You can also enable this driver explicitly using:
+
+  my $schema = SchemaClass->clone;
+  $schema->storage_type('::DBI::Sybase::ASE::NoBindVars');
+  $schema->connect($dsn, $user, $pass, \%opts);
+
+See the discussion in L<< DBD::Sybase/Using ? Placeholders & bind parameters to
+$sth->execute >> for details on the pros and cons of using placeholders.
+
+One advantage of not using placeholders is that C<select @@identity> will work
+for obtainging the last insert id of an C<IDENTITY> column, instead of having to
+do C<select max(col)> in a transaction as the base Sybase driver does.
+
+When using this driver, bind variables will be interpolated (properly quoted of
+course) into the SQL query itself, without using placeholders.
+
+The caching of prepared statements is also explicitly disabled, as the
+interpolation renders it useless.
+
+=head1 AUTHORS
+
+See L<DBIx::Class/CONTRIBUTORS>.
+
+=head1 LICENSE
+
+You may distribute this code under the same terms as Perl itself.
+
+=cut
+# vim:sts=2 sw=2:

Copied: DBIx-Class/0.08/branches/sybase_refactor/lib/DBIx/Class/Storage/DBI/Sybase/SQL_Server.pm (from rev 7933, DBIx-Class/0.08/branches/sybase_refactor/lib/DBIx/Class/Storage/DBI/Sybase.pm)
===================================================================
--- DBIx-Class/0.08/branches/sybase_refactor/lib/DBIx/Class/Storage/DBI/Sybase/SQL_Server.pm	                        (rev 0)
+++ DBIx-Class/0.08/branches/sybase_refactor/lib/DBIx/Class/Storage/DBI/Sybase/SQL_Server.pm	2009-11-23 00:06:48 UTC (rev 7934)
@@ -0,0 +1,1132 @@
+package DBIx::Class::Storage::DBI::Sybase::ASE;
+
+use strict;
+use warnings;
+
+use base qw/
+    DBIx::Class::Storage::DBI::Sybase
+    DBIx::Class::Storage::DBI::AutoCast
+/;
+use mro 'c3';
+use Carp::Clan qw/^DBIx::Class/;
+use Scalar::Util();
+use List::Util();
+use Sub::Name();
+use Data::Dumper::Concise();
+
+__PACKAGE__->mk_group_accessors('simple' =>
+    qw/_identity _blob_log_on_update _writer_storage _is_extra_storage
+       _bulk_storage _is_bulk_storage _began_bulk_work
+       _bulk_disabled_due_to_coderef_connect_info_warned
+       _identity_method/
+);
+
+my @also_proxy_to_extra_storages = qw/
+  connect_call_set_auto_cast auto_cast connect_call_blob_setup
+  connect_call_datetime_setup
+
+  disconnect _connect_info _sql_maker _sql_maker_opts disable_sth_caching
+  auto_savepoint unsafe cursor_class debug debugobj schema
+/;
+
+=head1 NAME
+
+DBIx::Class::Storage::DBI::Sybase::ASE - Sybase ASE SQL Server support for
+DBIx::Class
+
+=head1 SYNOPSIS
+
+This subclass supports L<DBD::Sybase> for real (non-Microsoft) Sybase databases.
+
+=head1 DESCRIPTION
+
+If your version of Sybase does not support placeholders, then your storage will
+be reblessed to L<DBIx::Class::Storage::DBI::Sybase::ASE::NoBindVars>.
+You can also enable that driver explicitly, see the documentation for more
+details.
+
+With this driver there is unfortunately no way to get the C<last_insert_id>
+without doing a C<SELECT MAX(col)>. This is done safely in a transaction
+(locking the table.) See L</INSERTS WITH PLACEHOLDERS>.
+
+A recommended L<DBIx::Class::Storage::DBI/connect_info> setting:
+
+  on_connect_call => [['datetime_setup'], ['blob_setup', log_on_update => 0]]
+
+=head1 METHODS
+
+=cut
+
+sub _rebless {
+  my $self = shift;
+
+  my $no_bind_vars = __PACKAGE__ . '::NoBindVars';
+
+  if ($self->using_freetds) {
+    carp <<'EOF' unless $ENV{DBIC_SYBASE_FREETDS_NOWARN};
+
+You are using FreeTDS with Sybase.
+
+We will do our best to support this configuration, but please consider this
+support experimental.
+
+TEXT/IMAGE columns will definitely not work.
+
+You are encouraged to recompile DBD::Sybase with the Sybase Open Client libraries
+instead.
+
+See perldoc DBIx::Class::Storage::DBI::Sybase::ASE for more details.
+
+To turn off this warning set the DBIC_SYBASE_FREETDS_NOWARN environment
+variable.
+EOF
+
+    if (not $self->_typeless_placeholders_supported) {
+      if ($self->_placeholders_supported) {
+        $self->auto_cast(1);
+      }
+      else {
+        $self->ensure_class_loaded($no_bind_vars);
+        bless $self, $no_bind_vars;
+        $self->_rebless;
+      }
+    }
+  }
+
+  elsif (not $self->_get_dbh->{syb_dynamic_supported}) {
+    # not necessarily FreeTDS, but no placeholders nevertheless
+    $self->ensure_class_loaded($no_bind_vars);
+    bless $self, $no_bind_vars;
+    $self->_rebless;
+  }
+  # this is highly unlikely, but we check just in case
+  elsif (not $self->_typeless_placeholders_supported) {
+    $self->auto_cast(1);
+  }
+}
+
+sub _init {
+  my $self = shift;
+  $self->_set_max_connect(256);
+
+# create storage for insert/(update blob) transactions,
+# unless this is that storage
+  return if $self->_is_extra_storage;
+
+  my $writer_storage = (ref $self)->new;
+
+  $writer_storage->_is_extra_storage(1);
+  $writer_storage->connect_info($self->connect_info);
+  $writer_storage->auto_cast($self->auto_cast);
+
+  $self->_writer_storage($writer_storage);
+
+# create a bulk storage unless connect_info is a coderef
+  return if ref($self->_dbi_connect_info->[0]) eq 'CODE';
+
+  my $bulk_storage = (ref $self)->new;
+
+  $bulk_storage->_is_extra_storage(1);
+  $bulk_storage->_is_bulk_storage(1); # for special ->disconnect acrobatics
+  $bulk_storage->connect_info($self->connect_info);
+
+# this is why
+  $bulk_storage->_dbi_connect_info->[0] .= ';bulkLogin=1';
+
+  $self->_bulk_storage($bulk_storage);
+}
+
+for my $method (@also_proxy_to_extra_storages) {
+  no strict 'refs';
+  no warnings 'redefine';
+
+  my $replaced = __PACKAGE__->can($method);
+
+  *{$method} = Sub::Name::subname $method => sub {
+    my $self = shift;
+    $self->_writer_storage->$replaced(@_) if $self->_writer_storage;
+    $self->_bulk_storage->$replaced(@_)   if $self->_bulk_storage;
+    return $self->$replaced(@_);
+  };
+}
+
+sub disconnect {
+  my $self = shift;
+
+# Even though we call $sth->finish for uses off the bulk API, there's still an
+# "active statement" warning on disconnect, which we throw away here.
+# This is due to the bug described in insert_bulk.
+# Currently a noop because 'prepare' is used instead of 'prepare_cached'.
+  local $SIG{__WARN__} = sub {
+    warn $_[0] unless $_[0] =~ /active statement/i;
+  } if $self->_is_bulk_storage;
+
+# so that next transaction gets a dbh
+  $self->_began_bulk_work(0) if $self->_is_bulk_storage;
+
+  $self->next::method;
+}
+
+# Set up session settings for Sybase databases for the connection.
+#
+# Make sure we have CHAINED mode turned on if AutoCommit is off in non-FreeTDS
+# DBD::Sybase (since we don't know how DBD::Sybase was compiled.) If however
+# we're using FreeTDS, CHAINED mode turns on an implicit transaction which we
+# only want when AutoCommit is off.
+#
+# Also SET TEXTSIZE for FreeTDS because LongReadLen doesn't work.
+sub _run_connection_actions {
+  my $self = shift;
+
+  if ($self->_is_bulk_storage) {
+# this should be cleared on every reconnect
+    $self->_began_bulk_work(0);
+    return;
+  }
+
+  if (not $self->using_freetds) {
+    $self->_dbh->{syb_chained_txn} = 1;
+  } else {
+    # based on LongReadLen in connect_info
+    $self->set_textsize;
+
+    if ($self->_dbh_autocommit) {
+      $self->_dbh->do('SET CHAINED OFF');
+    } else {
+      $self->_dbh->do('SET CHAINED ON');
+    }
+  }
+
+  $self->next::method(@_);
+}
+
+=head2 connect_call_blob_setup
+
+Used as:
+
+  on_connect_call => [ [ 'blob_setup', log_on_update => 0 ] ]
+
+Does C<< $dbh->{syb_binary_images} = 1; >> to return C<IMAGE> data as raw binary
+instead of as a hex string.
+
+Recommended.
+
+Also sets the C<log_on_update> value for blob write operations. The default is
+C<1>, but C<0> is better if your database is configured for it.
+
+See
+L<DBD::Sybase/Handling_IMAGE/TEXT_data_with_syb_ct_get_data()/syb_ct_send_data()>.
+
+=cut
+
+sub connect_call_blob_setup {
+  my $self = shift;
+  my %args = @_;
+  my $dbh = $self->_dbh;
+  $dbh->{syb_binary_images} = 1;
+
+  $self->_blob_log_on_update($args{log_on_update})
+    if exists $args{log_on_update};
+}
+
+sub _is_lob_type {
+  my $self = shift;
+  my $type = shift;
+  $type && $type =~ /(?:text|image|lob|bytea|binary|memo)/i;
+}
+
+sub _is_lob_column {
+  my ($self, $source, $column) = @_;
+
+  return $self->_is_lob_type($source->column_info($column)->{data_type});
+}
+
+sub _prep_for_execute {
+  my $self = shift;
+  my ($op, $extra_bind, $ident, $args) = @_;
+
+  my ($sql, $bind) = $self->next::method (@_);
+
+  my $table = Scalar::Util::blessed($ident) ? $ident->from : $ident;
+
+  my $bind_info = $self->_resolve_column_info(
+    $ident, [map $_->[0], @{$bind}]
+  );
+  my $bound_identity_col = List::Util::first
+    { $bind_info->{$_}{is_auto_increment} }
+    (keys %$bind_info)
+  ;
+  my $identity_col = Scalar::Util::blessed($ident) &&
+    List::Util::first
+    { $ident->column_info($_)->{is_auto_increment} }
+    $ident->columns
+  ;
+
+  if (($op eq 'insert' && $bound_identity_col) ||
+      ($op eq 'update' && exists $args->[0]{$identity_col})) {
+    $sql = join ("\n",
+      $self->_set_table_identity_sql($op => $table, 'on'),
+      $sql,
+      $self->_set_table_identity_sql($op => $table, 'off'),
+    );
+  }
+
+  if ($op eq 'insert' && (not $bound_identity_col) && $identity_col &&
+      (not $self->{insert_bulk})) {
+    $sql =
+      "$sql\n" .
+      $self->_fetch_identity_sql($ident, $identity_col);
+  }
+
+  return ($sql, $bind);
+}
+
+sub _set_table_identity_sql {
+  my ($self, $op, $table, $on_off) = @_;
+
+  return sprintf 'SET IDENTITY_%s %s %s',
+    uc($op), $self->sql_maker->_quote($table), uc($on_off);
+}
+
+# Stolen from SQLT, with some modifications. This is a makeshift
+# solution before a sane type-mapping library is available, thus
+# the 'our' for easy overrides.
+our %TYPE_MAPPING  = (
+    number    => 'numeric',
+    money     => 'money',
+    varchar   => 'varchar',
+    varchar2  => 'varchar',
+    timestamp => 'datetime',
+    text      => 'varchar',
+    real      => 'double precision',
+    comment   => 'text',
+    bit       => 'bit',
+    tinyint   => 'smallint',
+    float     => 'double precision',
+    serial    => 'numeric',
+    bigserial => 'numeric',
+    boolean   => 'varchar',
+    long      => 'varchar',
+);
+
+sub _native_data_type {
+  my ($self, $type) = @_;
+
+  $type = lc $type;
+  $type =~ s/\s* identity//x;
+
+  return uc($TYPE_MAPPING{$type} || $type);
+}
+
+sub _fetch_identity_sql {
+  my ($self, $source, $col) = @_;
+
+  return sprintf ("SELECT MAX(%s) FROM %s",
+    map { $self->sql_maker->_quote ($_) } ($col, $source->from)
+  );
+}
+
+sub _execute {
+  my $self = shift;
+  my ($op) = @_;
+
+  my ($rv, $sth, @bind) = $self->dbh_do($self->can('_dbh_execute'), @_);
+
+  if ($op eq 'insert') {
+    $self->_identity($sth->fetchrow_array);
+    $sth->finish;
+  }
+
+  return wantarray ? ($rv, $sth, @bind) : $rv;
+}
+
+sub last_insert_id { shift->_identity }
+
+# handles TEXT/IMAGE and transaction for last_insert_id
+sub insert {
+  my $self = shift;
+  my ($source, $to_insert) = @_;
+
+  my $identity_col = (List::Util::first
+    { $source->column_info($_)->{is_auto_increment} }
+    $source->columns) || '';
+
+  # check for empty insert
+  # INSERT INTO foo DEFAULT VALUES -- does not work with Sybase
+  # try to insert explicit 'DEFAULT's instead (except for identity)
+  if (not %$to_insert) {
+    for my $col ($source->columns) {
+      next if $col eq $identity_col;
+      $to_insert->{$col} = \'DEFAULT';
+    }
+  }
+
+  my $blob_cols = $self->_remove_blob_cols($source, $to_insert);
+
+  # do we need the horrific SELECT MAX(COL) hack?
+  my $dumb_last_insert_id =
+       $identity_col
+    && (not exists $to_insert->{$identity_col})
+    && ($self->_identity_method||'') ne '@@IDENTITY';
+
+  my $next = $self->next::can;
+
+  # we are already in a transaction, or there are no blobs
+  # and we don't need the PK - just (try to) do it
+  if ($self->{transaction_depth}
+        || (!$blob_cols && !$dumb_last_insert_id)
+  ) {
+    return $self->_insert (
+      $next, $source, $to_insert, $blob_cols, $identity_col
+    );
+  }
+
+  # otherwise use the _writer_storage to do the insert+transaction on another
+  # connection
+  my $guard = $self->_writer_storage->txn_scope_guard;
+
+  my $updated_cols = $self->_writer_storage->_insert (
+    $next, $source, $to_insert, $blob_cols, $identity_col
+  );
+
+  $self->_identity($self->_writer_storage->_identity);
+
+  $guard->commit;
+
+  return $updated_cols;
+}
+
+sub _insert {
+  my ($self, $next, $source, $to_insert, $blob_cols, $identity_col) = @_;
+
+  my $updated_cols = $self->$next ($source, $to_insert);
+
+  my $final_row = {
+    ($identity_col ?
+      ($identity_col => $self->last_insert_id($source, $identity_col)) : ()),
+    %$to_insert,
+    %$updated_cols,
+  };
+
+  $self->_insert_blobs ($source, $blob_cols, $final_row) if $blob_cols;
+
+  return $updated_cols;
+}
+
+sub update {
+  my $self = shift;
+  my ($source, $fields, $where, @rest) = @_;
+
+  my $wantarray = wantarray;
+
+  my $blob_cols = $self->_remove_blob_cols($source, $fields);
+
+  my $table = $source->name;
+
+  my $identity_col = List::Util::first
+    { $source->column_info($_)->{is_auto_increment} }
+    $source->columns;
+
+  my $is_identity_update = $identity_col && defined $fields->{$identity_col};
+
+  return $self->next::method(@_) unless $blob_cols;
+
+# If there are any blobs in $where, Sybase will return a descriptive error
+# message.
+# XXX blobs can still be used with a LIKE query, and this should be handled.
+
+# update+blob update(s) done atomically on separate connection
+  $self = $self->_writer_storage;
+
+  my $guard = $self->txn_scope_guard;
+
+# First update the blob columns to be updated to '' (taken from $fields, where
+# it is originally put by _remove_blob_cols .)
+  my %blobs_to_empty = map { ($_ => delete $fields->{$_}) } keys %$blob_cols;
+
+# We can't only update NULL blobs, because blobs cannot be in the WHERE clause.
+
+  $self->next::method($source, \%blobs_to_empty, $where, @rest);
+
+# Now update the blobs before the other columns in case the update of other
+# columns makes the search condition invalid.
+  $self->_update_blobs($source, $blob_cols, $where);
+
+  my @res;
+  if (%$fields) {
+    if ($wantarray) {
+      @res    = $self->next::method(@_);
+    }
+    elsif (defined $wantarray) {
+      $res[0] = $self->next::method(@_);
+    }
+    else {
+      $self->next::method(@_);
+    }
+  }
+
+  $guard->commit;
+
+  return $wantarray ? @res : $res[0];
+}
+
+sub insert_bulk {
+  my $self = shift;
+  my ($source, $cols, $data) = @_;
+
+  my $identity_col = List::Util::first
+    { $source->column_info($_)->{is_auto_increment} }
+    $source->columns;
+
+  my $is_identity_insert = (List::Util::first
+    { $_ eq $identity_col }
+    @{$cols}
+  ) ? 1 : 0;
+
+  my @source_columns = $source->columns;
+
+  my $use_bulk_api =
+    $self->_bulk_storage &&
+    $self->_get_dbh->{syb_has_blk};
+
+  if ((not $use_bulk_api)
+        &&
+      (ref($self->_dbi_connect_info->[0]) eq 'CODE')
+        &&
+      (not $self->_bulk_disabled_due_to_coderef_connect_info_warned)) {
+    carp <<'EOF';
+Bulk API support disabled due to use of a CODEREF connect_info. Reverting to
+regular array inserts.
+EOF
+    $self->_bulk_disabled_due_to_coderef_connect_info_warned(1);
+  }
+
+  if (not $use_bulk_api) {
+    my $blob_cols = $self->_remove_blob_cols_array($source, $cols, $data);
+
+# _execute_array uses a txn anyway, but it ends too early in case we need to
+# select max(col) to get the identity for inserting blobs.
+    ($self, my $guard) = $self->{transaction_depth} == 0 ?
+      ($self->_writer_storage, $self->_writer_storage->txn_scope_guard)
+      :
+      ($self, undef);
+
+    local $self->{insert_bulk} = 1;
+
+    $self->next::method(@_);
+
+    if ($blob_cols) {
+      if ($is_identity_insert) {
+        $self->_insert_blobs_array ($source, $blob_cols, $cols, $data);
+      }
+      else {
+        my @cols_with_identities = (@$cols, $identity_col);
+
+        ## calculate identities
+        # XXX This assumes identities always increase by 1, which may or may not
+        # be true.
+        my ($last_identity) =
+          $self->_dbh->selectrow_array (
+            $self->_fetch_identity_sql($source, $identity_col)
+          );
+        my @identities = (($last_identity - @$data + 1) .. $last_identity);
+
+        my @data_with_identities = map [@$_, shift @identities], @$data;
+
+        $self->_insert_blobs_array (
+          $source, $blob_cols, \@cols_with_identities, \@data_with_identities
+        );
+      }
+    }
+
+    $guard->commit if $guard;
+
+    return;
+  }
+
+# otherwise, use the bulk API
+
+# rearrange @$data so that columns are in database order
+  my %orig_idx;
+  @orig_idx{@$cols} = 0..$#$cols;
+
+  my %new_idx;
+  @new_idx{@source_columns} = 0..$#source_columns;
+
+  my @new_data;
+  for my $datum (@$data) {
+    my $new_datum = [];
+    for my $col (@source_columns) {
+# identity data will be 'undef' if not $is_identity_insert
+# columns with defaults will also be 'undef'
+      $new_datum->[ $new_idx{$col} ] =
+        exists $orig_idx{$col} ? $datum->[ $orig_idx{$col} ] : undef;
+    }
+    push @new_data, $new_datum;
+  }
+
+# bcp identity index is 1-based
+  my $identity_idx = exists $new_idx{$identity_col} ?
+    $new_idx{$identity_col} + 1 : 0;
+
+## Set a client-side conversion error handler, straight from DBD::Sybase docs.
+# This ignores any data conversion errors detected by the client side libs, as
+# they are usually harmless.
+  my $orig_cslib_cb = DBD::Sybase::set_cslib_cb(
+    Sub::Name::subname insert_bulk => sub {
+      my ($layer, $origin, $severity, $errno, $errmsg, $osmsg, $blkmsg) = @_;
+
+      return 1 if $errno == 36;
+
+      carp
+        "Layer: $layer, Origin: $origin, Severity: $severity, Error: $errno" .
+        ($errmsg ? "\n$errmsg" : '') .
+        ($osmsg  ? "\n$osmsg"  : '')  .
+        ($blkmsg ? "\n$blkmsg" : '');
+
+      return 0;
+  });
+
+  eval {
+    my $bulk = $self->_bulk_storage;
+
+    my $guard = $bulk->txn_scope_guard;
+
+## XXX get this to work instead of our own $sth
+## will require SQLA or *Hacks changes for ordered columns
+#    $bulk->next::method($source, \@source_columns, \@new_data, {
+#      syb_bcp_attribs => {
+#        identity_flag   => $is_identity_insert,
+#        identity_column => $identity_idx,
+#      }
+#    });
+    my $sql = 'INSERT INTO ' .
+      $bulk->sql_maker->_quote($source->name) . ' (' .
+# colname list is ignored for BCP, but does no harm
+      (join ', ', map $bulk->sql_maker->_quote($_), @source_columns) . ') '.
+      ' VALUES ('.  (join ', ', ('?') x @source_columns) . ')';
+
+## XXX there's a bug in the DBD::Sybase bulk support that makes $sth->finish for
+## a prepare_cached statement ineffective. Replace with ->sth when fixed, or
+## better yet the version above. Should be fixed in DBD::Sybase .
+    my $sth = $bulk->_get_dbh->prepare($sql,
+#      'insert', # op
+      {
+        syb_bcp_attribs => {
+          identity_flag   => $is_identity_insert,
+          identity_column => $identity_idx,
+        }
+      }
+    );
+
+    my @bind = do {
+      my $idx = 0;
+      map [ $_, $idx++ ], @source_columns;
+    };
+
+    $self->_execute_array(
+      $source, $sth, \@bind, \@source_columns, \@new_data, sub {
+        $guard->commit
+      }
+    );
+
+    $bulk->_query_end($sql);
+  };
+
+  my $exception = $@;
+  DBD::Sybase::set_cslib_cb($orig_cslib_cb);
+
+  if ($exception =~ /-Y option/) {
+    carp <<"EOF";
+
+Sybase bulk API operation failed due to character set incompatibility, reverting
+to regular array inserts:
+
+*** Try unsetting the LANG environment variable.
+
+$exception
+EOF
+    $self->_bulk_storage(undef);
+    unshift @_, $self;
+    goto \&insert_bulk;
+  }
+  elsif ($exception) {
+# rollback makes the bulkLogin connection unusable
+    $self->_bulk_storage->disconnect;
+    $self->throw_exception($exception);
+  }
+}
+
+sub _dbh_execute_array {
+  my ($self, $sth, $tuple_status, $cb) = @_;
+
+  my $rv = $self->next::method($sth, $tuple_status);
+  $cb->() if $cb;
+
+  return $rv;
+}
+
+# Make sure blobs are not bound as placeholders, and return any non-empty ones
+# as a hash.
+sub _remove_blob_cols {
+  my ($self, $source, $fields) = @_;
+
+  my %blob_cols;
+
+  for my $col (keys %$fields) {
+    if ($self->_is_lob_column($source, $col)) {
+      my $blob_val = delete $fields->{$col};
+      if (not defined $blob_val) {
+        $fields->{$col} = \'NULL';
+      }
+      else {
+        $fields->{$col} = \"''";
+        $blob_cols{$col} = $blob_val unless $blob_val eq '';
+      }
+    }
+  }
+
+  return %blob_cols ? \%blob_cols : undef;
+}
+
+# same for insert_bulk
+sub _remove_blob_cols_array {
+  my ($self, $source, $cols, $data) = @_;
+
+  my @blob_cols;
+
+  for my $i (0..$#$cols) {
+    my $col = $cols->[$i];
+
+    if ($self->_is_lob_column($source, $col)) {
+      for my $j (0..$#$data) {
+        my $blob_val = delete $data->[$j][$i];
+        if (not defined $blob_val) {
+          $data->[$j][$i] = \'NULL';
+        }
+        else {
+          $data->[$j][$i] = \"''";
+          $blob_cols[$j][$i] = $blob_val
+            unless $blob_val eq '';
+        }
+      }
+    }
+  }
+
+  return @blob_cols ? \@blob_cols : undef;
+}
+
+sub _update_blobs {
+  my ($self, $source, $blob_cols, $where) = @_;
+
+  my (@primary_cols) = $source->primary_columns;
+
+  $self->throw_exception('Cannot update TEXT/IMAGE column(s) without a primary key')
+    unless @primary_cols;
+
+# check if we're updating a single row by PK
+  my $pk_cols_in_where = 0;
+  for my $col (@primary_cols) {
+    $pk_cols_in_where++ if defined $where->{$col};
+  }
+  my @rows;
+
+  if ($pk_cols_in_where == @primary_cols) {
+    my %row_to_update;
+    @row_to_update{@primary_cols} = @{$where}{@primary_cols};
+    @rows = \%row_to_update;
+  } else {
+    my $cursor = $self->select ($source, \@primary_cols, $where, {});
+    @rows = map {
+      my %row; @row{@primary_cols} = @$_; \%row
+    } $cursor->all;
+  }
+
+  for my $row (@rows) {
+    $self->_insert_blobs($source, $blob_cols, $row);
+  }
+}
+
+sub _insert_blobs {
+  my ($self, $source, $blob_cols, $row) = @_;
+  my $dbh = $self->_get_dbh;
+
+  my $table = $source->name;
+
+  my %row = %$row;
+  my (@primary_cols) = $source->primary_columns;
+
+  $self->throw_exception('Cannot update TEXT/IMAGE column(s) without a primary key')
+    unless @primary_cols;
+
+  $self->throw_exception('Cannot update TEXT/IMAGE column(s) without primary key values')
+    if ((grep { defined $row{$_} } @primary_cols) != @primary_cols);
+
+  for my $col (keys %$blob_cols) {
+    my $blob = $blob_cols->{$col};
+
+    my %where = map { ($_, $row{$_}) } @primary_cols;
+
+    my $cursor = $self->select ($source, [$col], \%where, {});
+    $cursor->next;
+    my $sth = $cursor->sth;
+
+    if (not $sth) {
+
+      $self->throw_exception(
+          "Could not find row in table '$table' for blob update:\n"
+        . Data::Dumper::Concise::Dumper (\%where)
+      );
+    }
+
+    eval {
+      do {
+        $sth->func('CS_GET', 1, 'ct_data_info') or die $sth->errstr;
+      } while $sth->fetch;
+
+      $sth->func('ct_prepare_send') or die $sth->errstr;
+
+      my $log_on_update = $self->_blob_log_on_update;
+      $log_on_update    = 1 if not defined $log_on_update;
+
+      $sth->func('CS_SET', 1, {
+        total_txtlen => length($blob),
+        log_on_update => $log_on_update
+      }, 'ct_data_info') or die $sth->errstr;
+
+      $sth->func($blob, length($blob), 'ct_send_data') or die $sth->errstr;
+
+      $sth->func('ct_finish_send') or die $sth->errstr;
+    };
+    my $exception = $@;
+    $sth->finish if $sth;
+    if ($exception) {
+      if ($self->using_freetds) {
+        $self->throw_exception (
+          'TEXT/IMAGE operation failed, probably because you are using FreeTDS: '
+          . $exception
+        );
+      } else {
+        $self->throw_exception($exception);
+      }
+    }
+  }
+}
+
+sub _insert_blobs_array {
+  my ($self, $source, $blob_cols, $cols, $data) = @_;
+
+  for my $i (0..$#$data) {
+    my $datum = $data->[$i];
+
+    my %row;
+    @row{ @$cols } = @$datum;
+
+    my %blob_vals;
+    for my $j (0..$#$cols) {
+      if (exists $blob_cols->[$i][$j]) {
+        $blob_vals{ $cols->[$j] } = $blob_cols->[$i][$j];
+      }
+    }
+
+    $self->_insert_blobs ($source, \%blob_vals, \%row);
+  }
+}
+
+=head2 connect_call_datetime_setup
+
+Used as:
+
+  on_connect_call => 'datetime_setup'
+
+In L<DBIx::Class::Storage::DBI/connect_info> to set:
+
+  $dbh->syb_date_fmt('ISO_strict'); # output fmt: 2004-08-21T14:36:48.080Z
+  $dbh->do('set dateformat mdy');   # input fmt:  08/13/1979 18:08:55.080
+
+On connection for use with L<DBIx::Class::InflateColumn::DateTime>, using
+L<DateTime::Format::Sybase>, which you will need to install.
+
+This works for both C<DATETIME> and C<SMALLDATETIME> columns, although
+C<SMALLDATETIME> columns only have minute precision.
+
+=cut
+
+{
+  my $old_dbd_warned = 0;
+
+  sub connect_call_datetime_setup {
+    my $self = shift;
+    my $dbh = $self->_get_dbh;
+
+    if ($dbh->can('syb_date_fmt')) {
+      # amazingly, this works with FreeTDS
+      $dbh->syb_date_fmt('ISO_strict');
+    } elsif (not $old_dbd_warned) {
+      carp "Your DBD::Sybase is too old to support ".
+      "DBIx::Class::InflateColumn::DateTime, please upgrade!";
+      $old_dbd_warned = 1;
+    }
+
+    $dbh->do('SET DATEFORMAT mdy');
+
+    1;
+  }
+}
+
+sub datetime_parser_type { "DateTime::Format::Sybase" }
+
+# ->begin_work and such have no effect with FreeTDS but we run them anyway to
+# let the DBD keep any state it needs to.
+#
+# If they ever do start working, the extra statements will do no harm (because
+# Sybase supports nested transactions.)
+
+sub _dbh_begin_work {
+  my $self = shift;
+
+# bulkLogin=1 connections are always in a transaction, and can only call BEGIN
+# TRAN once. However, we need to make sure there's a $dbh.
+  return if $self->_is_bulk_storage && $self->_dbh && $self->_began_bulk_work;
+
+  $self->next::method(@_);
+
+  if ($self->using_freetds) {
+    $self->_get_dbh->do('BEGIN TRAN');
+  }
+
+  $self->_began_bulk_work(1) if $self->_is_bulk_storage;
+}
+
+sub _dbh_commit {
+  my $self = shift;
+  if ($self->using_freetds) {
+    $self->_dbh->do('COMMIT');
+  }
+  return $self->next::method(@_);
+}
+
+sub _dbh_rollback {
+  my $self = shift;
+  if ($self->using_freetds) {
+    $self->_dbh->do('ROLLBACK');
+  }
+  return $self->next::method(@_);
+}
+
+# savepoint support using ASE syntax
+
+sub _svp_begin {
+  my ($self, $name) = @_;
+
+  $self->_get_dbh->do("SAVE TRANSACTION $name");
+}
+
+# A new SAVE TRANSACTION with the same name releases the previous one.
+sub _svp_release { 1 }
+
+sub _svp_rollback {
+  my ($self, $name) = @_;
+
+  $self->_get_dbh->do("ROLLBACK TRANSACTION $name");
+}
+
+1;
+
+=head1 Schema::Loader Support
+
+There is an experimental branch of L<DBIx::Class::Schema::Loader> that will
+allow you to dump a schema from most (if not all) versions of Sybase.
+
+It is available via subversion from:
+
+  http://dev.catalyst.perl.org/repos/bast/branches/DBIx-Class-Schema-Loader/current/
+
+=head1 FreeTDS
+
+This driver supports L<DBD::Sybase> compiled against FreeTDS
+(L<http://www.freetds.org/>) to the best of our ability, however it is
+recommended that you recompile L<DBD::Sybase> against the Sybase Open Client
+libraries. They are a part of the Sybase ASE distribution:
+
+The Open Client FAQ is here:
+L<http://www.isug.com/Sybase_FAQ/ASE/section7.html>.
+
+Sybase ASE for Linux (which comes with the Open Client libraries) may be
+downloaded here: L<http://response.sybase.com/forms/ASE_Linux_Download>.
+
+To see if you're using FreeTDS check C<< $schema->storage->using_freetds >>, or run:
+
+  perl -MDBI -le 'my $dbh = DBI->connect($dsn, $user, $pass); print $dbh->{syb_oc_version}'
+
+Some versions of the libraries involved will not support placeholders, in which
+case the storage will be reblessed to
+L<DBIx::Class::Storage::DBI::Sybase::ASE::NoBindVars>.
+
+In some configurations, placeholders will work but will throw implicit type
+conversion errors for anything that's not expecting a string. In such a case,
+the C<auto_cast> option from L<DBIx::Class::Storage::DBI::AutoCast> is
+automatically set, which you may enable on connection with
+L<DBIx::Class::Storage::DBI::AutoCast/connect_call_set_auto_cast>. The type info
+for the C<CAST>s is taken from the L<DBIx::Class::ResultSource/data_type>
+definitions in your Result classes, and are mapped to a Sybase type (if it isn't
+already) using a mapping based on L<SQL::Translator>.
+
+In other configurations, placeholers will work just as they do with the Sybase
+Open Client libraries.
+
+Inserts or updates of TEXT/IMAGE columns will B<NOT> work with FreeTDS.
+
+=head1 INSERTS WITH PLACEHOLDERS
+
+With placeholders enabled, inserts are done in a transaction so that there are
+no concurrency issues with getting the inserted identity value using
+C<SELECT MAX(col)>, which is the only way to get the C<IDENTITY> value in this
+mode.
+
+In addition, they are done on a separate connection so that it's possible to
+have active cursors when doing an insert.
+
+When using C<DBIx::Class::Storage::DBI::Sybase::ASE::NoBindVars> transactions
+are disabled, as there are no concurrency issues with C<SELECT @@IDENTITY> as
+it's a session variable.
+
+=head1 TRANSACTIONS
+
+Due to limitations of the TDS protocol, L<DBD::Sybase>, or both; you cannot
+begin a transaction while there are active cursors; nor can you use multiple
+active cursors within a transaction. An active cursor is, for example, a
+L<ResultSet|DBIx::Class::ResultSet> that has been executed using C<next> or
+C<first> but has not been exhausted or L<reset|DBIx::Class::ResultSet/reset>.
+
+For example, this will not work:
+
+  $schema->txn_do(sub {
+    my $rs = $schema->resultset('Book');
+    while (my $row = $rs->next) {
+      $schema->resultset('MetaData')->create({
+        book_id => $row->id,
+        ...
+      });
+    }
+  });
+
+This won't either:
+
+  my $first_row = $large_rs->first;
+  $schema->txn_do(sub { ... });
+
+Transactions done for inserts in C<AutoCommit> mode when placeholders are in use
+are not affected, as they are done on an extra database handle.
+
+Some workarounds:
+
+=over 4
+
+=item * use L<DBIx::Class::Storage::DBI::Replicated>
+
+=item * L<connect|DBIx::Class::Schema/connect> another L<Schema|DBIx::Class::Schema>
+
+=item * load the data from your cursor with L<DBIx::Class::ResultSet/all>
+
+=back
+
+=head1 MAXIMUM CONNECTIONS
+
+The TDS protocol makes separate connections to the server for active statements
+in the background. By default the number of such connections is limited to 25,
+on both the client side and the server side.
+
+This is a bit too low for a complex L<DBIx::Class> application, so on connection
+the client side setting is set to C<256> (see L<DBD::Sybase/maxConnect>.) You
+can override it to whatever setting you like in the DSN.
+
+See
+L<http://infocenter.sybase.com/help/index.jsp?topic=/com.sybase.help.ase_15.0.sag1/html/sag1/sag1272.htm>
+for information on changing the setting on the server side.
+
+=head1 DATES
+
+See L</connect_call_datetime_setup> to setup date formats
+for L<DBIx::Class::InflateColumn::DateTime>.
+
+=head1 TEXT/IMAGE COLUMNS
+
+L<DBD::Sybase> compiled with FreeTDS will B<NOT> allow you to insert or update
+C<TEXT/IMAGE> columns.
+
+Setting C<< $dbh->{LongReadLen} >> will also not work with FreeTDS use either:
+
+  $schema->storage->dbh->do("SET TEXTSIZE $bytes");
+
+or
+
+  $schema->storage->set_textsize($bytes);
+
+instead.
+
+However, the C<LongReadLen> you pass in
+L<DBIx::Class::Storage::DBI/connect_info> is used to execute the equivalent
+C<SET TEXTSIZE> command on connection.
+
+See L</connect_call_blob_setup> for a L<DBIx::Class::Storage::DBI/connect_info>
+setting you need to work with C<IMAGE> columns.
+
+=head1 BULK API
+
+The experimental L<DBD::Sybase> Bulk API support is used for
+L<populate|DBIx::Class::ResultSet/populate> in B<void> context, in a transaction
+on a separate connection.
+
+To use this feature effectively, use a large number of rows for each
+L<populate|DBIx::Class::ResultSet/populate> call, eg.:
+
+  while (my $rows = $data_source->get_100_rows()) {
+    $rs->populate($rows);
+  }
+
+B<NOTE:> the L<add_columns|DBIx::Class::ResultSource/add_columns>
+calls in your C<Result> classes B<must> list columns in database order for this
+to work. Also, you may have to unset the C<LANG> environment variable before
+loading your app, if it doesn't match the character set of your database.
+
+When inserting IMAGE columns using this method, you'll need to use
+L</connect_call_blob_setup> as well.
+
+=head1 TODO
+
+=over
+
+=item *
+
+Transitions to AutoCommit=0 (starting a transaction) mode by exhausting
+any active cursors, using eager cursors.
+
+=item *
+
+Real limits and limited counts using stored procedures deployed on startup.
+
+=item *
+
+Adaptive Server Anywhere (ASA) support, with possible SQLA::Limit support.
+
+=item *
+
+Blob update with a LIKE query on a blob, without invalidating the WHERE condition.
+
+=item *
+
+bulk_insert using prepare_cached (see comments.)
+
+=back
+
+=head1 AUTHOR
+
+See L<DBIx::Class/CONTRIBUTORS>.
+
+=head1 LICENSE
+
+You may distribute this code under the same terms as Perl itself.
+
+=cut
+# vim:sts=2 sw=2:

Deleted: DBIx-Class/0.08/branches/sybase_refactor/lib/DBIx/Class/Storage/DBI/Sybase.pm
===================================================================
--- DBIx-Class/0.08/branches/sybase_refactor/lib/DBIx/Class/Storage/DBI/Sybase.pm	2009-11-22 23:38:34 UTC (rev 7933)
+++ DBIx-Class/0.08/branches/sybase_refactor/lib/DBIx/Class/Storage/DBI/Sybase.pm	2009-11-23 00:06:48 UTC (rev 7934)
@@ -1,1142 +0,0 @@
-package DBIx::Class::Storage::DBI::Sybase;
-
-use strict;
-use warnings;
-
-use base qw/
-    DBIx::Class::Storage::DBI::Sybase::Common
-    DBIx::Class::Storage::DBI::AutoCast
-/;
-use mro 'c3';
-use Carp::Clan qw/^DBIx::Class/;
-use List::Util();
-use Sub::Name();
-use Data::Dumper::Concise();
-
-__PACKAGE__->mk_group_accessors('simple' =>
-    qw/_identity _blob_log_on_update _writer_storage _is_extra_storage
-       _bulk_storage _is_bulk_storage _began_bulk_work
-       _bulk_disabled_due_to_coderef_connect_info_warned
-       _identity_method/
-);
-
-my @also_proxy_to_extra_storages = qw/
-  connect_call_set_auto_cast auto_cast connect_call_blob_setup
-  connect_call_datetime_setup
-
-  disconnect _connect_info _sql_maker _sql_maker_opts disable_sth_caching
-  auto_savepoint unsafe cursor_class debug debugobj schema
-/;
-
-=head1 NAME
-
-DBIx::Class::Storage::DBI::Sybase - Sybase support for DBIx::Class
-
-=head1 SYNOPSIS
-
-This subclass supports L<DBD::Sybase> for real Sybase databases.  If you are
-using an MSSQL database via L<DBD::Sybase>, your storage will be reblessed to
-L<DBIx::Class::Storage::DBI::Sybase::Microsoft_SQL_Server>.
-
-=head1 DESCRIPTION
-
-If your version of Sybase does not support placeholders, then your storage
-will be reblessed to L<DBIx::Class::Storage::DBI::Sybase::NoBindVars>. You can
-also enable that driver explicitly, see the documentation for more details.
-
-With this driver there is unfortunately no way to get the C<last_insert_id>
-without doing a C<SELECT MAX(col)>. This is done safely in a transaction
-(locking the table.) See L</INSERTS WITH PLACEHOLDERS>.
-
-A recommended L<DBIx::Class::Storage::DBI/connect_info> setting:
-
-  on_connect_call => [['datetime_setup'], ['blob_setup', log_on_update => 0]]
-
-=head1 METHODS
-
-=cut
-
-sub _rebless {
-  my $self = shift;
-
-  if (ref($self) eq 'DBIx::Class::Storage::DBI::Sybase') {
-    my $dbtype = eval {
-      @{$self->_get_dbh->selectrow_arrayref(qq{sp_server_info \@attribute_id=1})}[2]
-    } || '';
-    $self->throw_exception("Unable to estable connection to determine database type: $@")
-      if $@;
-
-    $dbtype =~ s/\W/_/gi;
-    my $subclass = "DBIx::Class::Storage::DBI::Sybase::${dbtype}";
-
-    if ($dbtype && $self->load_optional_class($subclass)) {
-      bless $self, $subclass;
-      $self->_rebless;
-    } else { # real Sybase
-      my $no_bind_vars = 'DBIx::Class::Storage::DBI::Sybase::NoBindVars';
-
-      if ($self->using_freetds) {
-        carp <<'EOF' unless $ENV{DBIC_SYBASE_FREETDS_NOWARN};
-
-You are using FreeTDS with Sybase.
-
-We will do our best to support this configuration, but please consider this
-support experimental.
-
-TEXT/IMAGE columns will definitely not work.
-
-You are encouraged to recompile DBD::Sybase with the Sybase Open Client libraries
-instead.
-
-See perldoc DBIx::Class::Storage::DBI::Sybase for more details.
-
-To turn off this warning set the DBIC_SYBASE_FREETDS_NOWARN environment
-variable.
-EOF
-        if (not $self->_typeless_placeholders_supported) {
-          if ($self->_placeholders_supported) {
-            $self->auto_cast(1);
-          } else {
-            $self->ensure_class_loaded($no_bind_vars);
-            bless $self, $no_bind_vars;
-            $self->_rebless;
-          }
-        }
-      }
-      elsif (not $self->_get_dbh->{syb_dynamic_supported}) {
-        # not necessarily FreeTDS, but no placeholders nevertheless
-        $self->ensure_class_loaded($no_bind_vars);
-        bless $self, $no_bind_vars;
-        $self->_rebless;
-      } elsif (not $self->_typeless_placeholders_supported) {
-        # this is highly unlikely, but we check just in case
-        $self->auto_cast(1);
-      }
-    }
-  }
-}
-
-sub _init {
-  my $self = shift;
-  $self->_set_max_connect(256);
-
-# create storage for insert/(update blob) transactions,
-# unless this is that storage
-  return if $self->_is_extra_storage;
-
-  my $writer_storage = (ref $self)->new;
-
-  $writer_storage->_is_extra_storage(1);
-  $writer_storage->connect_info($self->connect_info);
-  $writer_storage->auto_cast($self->auto_cast);
-
-  $self->_writer_storage($writer_storage);
-
-# create a bulk storage unless connect_info is a coderef
-  return
-    if (Scalar::Util::reftype($self->_dbi_connect_info->[0])||'') eq 'CODE';
-
-  my $bulk_storage = (ref $self)->new;
-
-  $bulk_storage->_is_extra_storage(1);
-  $bulk_storage->_is_bulk_storage(1); # for special ->disconnect acrobatics
-  $bulk_storage->connect_info($self->connect_info);
-
-# this is why
-  $bulk_storage->_dbi_connect_info->[0] .= ';bulkLogin=1';
-
-  $self->_bulk_storage($bulk_storage);
-}
-
-for my $method (@also_proxy_to_extra_storages) {
-  no strict 'refs';
-  no warnings 'redefine';
-
-  my $replaced = __PACKAGE__->can($method);
-
-  *{$method} = Sub::Name::subname $method => sub {
-    my $self = shift;
-    $self->_writer_storage->$replaced(@_) if $self->_writer_storage;
-    $self->_bulk_storage->$replaced(@_)   if $self->_bulk_storage;
-    return $self->$replaced(@_);
-  };
-}
-
-sub disconnect {
-  my $self = shift;
-
-# Even though we call $sth->finish for uses off the bulk API, there's still an
-# "active statement" warning on disconnect, which we throw away here.
-# This is due to the bug described in insert_bulk.
-# Currently a noop because 'prepare' is used instead of 'prepare_cached'.
-  local $SIG{__WARN__} = sub {
-    warn $_[0] unless $_[0] =~ /active statement/i;
-  } if $self->_is_bulk_storage;
-
-# so that next transaction gets a dbh
-  $self->_began_bulk_work(0) if $self->_is_bulk_storage;
-
-  $self->next::method;
-}
-
-# Set up session settings for Sybase databases for the connection.
-#
-# Make sure we have CHAINED mode turned on if AutoCommit is off in non-FreeTDS
-# DBD::Sybase (since we don't know how DBD::Sybase was compiled.) If however
-# we're using FreeTDS, CHAINED mode turns on an implicit transaction which we
-# only want when AutoCommit is off.
-#
-# Also SET TEXTSIZE for FreeTDS because LongReadLen doesn't work.
-sub _run_connection_actions {
-  my $self = shift;
-
-  if ($self->_is_bulk_storage) {
-# this should be cleared on every reconnect
-    $self->_began_bulk_work(0);
-    return;
-  }
-
-  if (not $self->using_freetds) {
-    $self->_dbh->{syb_chained_txn} = 1;
-  } else {
-    # based on LongReadLen in connect_info
-    $self->set_textsize;
-
-    if ($self->_dbh_autocommit) {
-      $self->_dbh->do('SET CHAINED OFF');
-    } else {
-      $self->_dbh->do('SET CHAINED ON');
-    }
-  }
-
-  $self->next::method(@_);
-}
-
-=head2 connect_call_blob_setup
-
-Used as:
-
-  on_connect_call => [ [ 'blob_setup', log_on_update => 0 ] ]
-
-Does C<< $dbh->{syb_binary_images} = 1; >> to return C<IMAGE> data as raw binary
-instead of as a hex string.
-
-Recommended.
-
-Also sets the C<log_on_update> value for blob write operations. The default is
-C<1>, but C<0> is better if your database is configured for it.
-
-See
-L<DBD::Sybase/Handling_IMAGE/TEXT_data_with_syb_ct_get_data()/syb_ct_send_data()>.
-
-=cut
-
-sub connect_call_blob_setup {
-  my $self = shift;
-  my %args = @_;
-  my $dbh = $self->_dbh;
-  $dbh->{syb_binary_images} = 1;
-
-  $self->_blob_log_on_update($args{log_on_update})
-    if exists $args{log_on_update};
-}
-
-sub _is_lob_type {
-  my $self = shift;
-  my $type = shift;
-  $type && $type =~ /(?:text|image|lob|bytea|binary|memo)/i;
-}
-
-sub _is_lob_column {
-  my ($self, $source, $column) = @_;
-
-  return $self->_is_lob_type($source->column_info($column)->{data_type});
-}
-
-sub _prep_for_execute {
-  my $self = shift;
-  my ($op, $extra_bind, $ident, $args) = @_;
-
-  my ($sql, $bind) = $self->next::method (@_);
-
-  my $table = Scalar::Util::blessed($ident) ? $ident->from : $ident;
-
-  my $bind_info = $self->_resolve_column_info(
-    $ident, [map $_->[0], @{$bind}]
-  );
-  my $bound_identity_col = List::Util::first
-    { $bind_info->{$_}{is_auto_increment} }
-    (keys %$bind_info)
-  ;
-  my $identity_col = Scalar::Util::blessed($ident) &&
-    List::Util::first
-    { $ident->column_info($_)->{is_auto_increment} }
-    $ident->columns
-  ;
-
-  if (($op eq 'insert' && $bound_identity_col) ||
-      ($op eq 'update' && exists $args->[0]{$identity_col})) {
-    $sql = join ("\n",
-      $self->_set_table_identity_sql($op => $table, 'on'),
-      $sql,
-      $self->_set_table_identity_sql($op => $table, 'off'),
-    );
-  }
-
-  if ($op eq 'insert' && (not $bound_identity_col) && $identity_col &&
-      (not $self->{insert_bulk})) {
-    $sql =
-      "$sql\n" .
-      $self->_fetch_identity_sql($ident, $identity_col);
-  }
-
-  return ($sql, $bind);
-}
-
-sub _set_table_identity_sql {
-  my ($self, $op, $table, $on_off) = @_;
-
-  return sprintf 'SET IDENTITY_%s %s %s',
-    uc($op), $self->sql_maker->_quote($table), uc($on_off);
-}
-
-# Stolen from SQLT, with some modifications. This is a makeshift
-# solution before a sane type-mapping library is available, thus
-# the 'our' for easy overrides.
-our %TYPE_MAPPING  = (
-    number    => 'numeric',
-    money     => 'money',
-    varchar   => 'varchar',
-    varchar2  => 'varchar',
-    timestamp => 'datetime',
-    text      => 'varchar',
-    real      => 'double precision',
-    comment   => 'text',
-    bit       => 'bit',
-    tinyint   => 'smallint',
-    float     => 'double precision',
-    serial    => 'numeric',
-    bigserial => 'numeric',
-    boolean   => 'varchar',
-    long      => 'varchar',
-);
-
-sub _native_data_type {
-  my ($self, $type) = @_;
-
-  $type = lc $type;
-  $type =~ s/\s* identity//x;
-
-  return uc($TYPE_MAPPING{$type} || $type);
-}
-
-sub _fetch_identity_sql {
-  my ($self, $source, $col) = @_;
-
-  return sprintf ("SELECT MAX(%s) FROM %s",
-    map { $self->sql_maker->_quote ($_) } ($col, $source->from)
-  );
-}
-
-sub _execute {
-  my $self = shift;
-  my ($op) = @_;
-
-  my ($rv, $sth, @bind) = $self->dbh_do($self->can('_dbh_execute'), @_);
-
-  if ($op eq 'insert') {
-    $self->_identity($sth->fetchrow_array);
-    $sth->finish;
-  }
-
-  return wantarray ? ($rv, $sth, @bind) : $rv;
-}
-
-sub last_insert_id { shift->_identity }
-
-# handles TEXT/IMAGE and transaction for last_insert_id
-sub insert {
-  my $self = shift;
-  my ($source, $to_insert) = @_;
-
-  my $identity_col = (List::Util::first
-    { $source->column_info($_)->{is_auto_increment} }
-    $source->columns) || '';
-
-  # check for empty insert
-  # INSERT INTO foo DEFAULT VALUES -- does not work with Sybase
-  # try to insert explicit 'DEFAULT's instead (except for identity)
-  if (not %$to_insert) {
-    for my $col ($source->columns) {
-      next if $col eq $identity_col;
-      $to_insert->{$col} = \'DEFAULT';
-    }
-  }
-
-  my $blob_cols = $self->_remove_blob_cols($source, $to_insert);
-
-  # do we need the horrific SELECT MAX(COL) hack?
-  my $dumb_last_insert_id =
-       $identity_col
-    && (not exists $to_insert->{$identity_col})
-    && ($self->_identity_method||'') ne '@@IDENTITY';
-
-  my $next = $self->next::can;
-
-  # we are already in a transaction, or there are no blobs
-  # and we don't need the PK - just (try to) do it
-  if ($self->{transaction_depth}
-        || (!$blob_cols && !$dumb_last_insert_id)
-  ) {
-    return $self->_insert (
-      $next, $source, $to_insert, $blob_cols, $identity_col
-    );
-  }
-
-  # otherwise use the _writer_storage to do the insert+transaction on another
-  # connection
-  my $guard = $self->_writer_storage->txn_scope_guard;
-
-  my $updated_cols = $self->_writer_storage->_insert (
-    $next, $source, $to_insert, $blob_cols, $identity_col
-  );
-
-  $self->_identity($self->_writer_storage->_identity);
-
-  $guard->commit;
-
-  return $updated_cols;
-}
-
-sub _insert {
-  my ($self, $next, $source, $to_insert, $blob_cols, $identity_col) = @_;
-
-  my $updated_cols = $self->$next ($source, $to_insert);
-
-  my $final_row = {
-    ($identity_col ?
-      ($identity_col => $self->last_insert_id($source, $identity_col)) : ()),
-    %$to_insert,
-    %$updated_cols,
-  };
-
-  $self->_insert_blobs ($source, $blob_cols, $final_row) if $blob_cols;
-
-  return $updated_cols;
-}
-
-sub update {
-  my $self = shift;
-  my ($source, $fields, $where, @rest) = @_;
-
-  my $wantarray = wantarray;
-
-  my $blob_cols = $self->_remove_blob_cols($source, $fields);
-
-  my $table = $source->name;
-
-  my $identity_col = List::Util::first
-    { $source->column_info($_)->{is_auto_increment} }
-    $source->columns;
-
-  my $is_identity_update = $identity_col && defined $fields->{$identity_col};
-
-  return $self->next::method(@_) unless $blob_cols;
-
-# If there are any blobs in $where, Sybase will return a descriptive error
-# message.
-# XXX blobs can still be used with a LIKE query, and this should be handled.
-
-# update+blob update(s) done atomically on separate connection
-  $self = $self->_writer_storage;
-
-  my $guard = $self->txn_scope_guard;
-
-# First update the blob columns to be updated to '' (taken from $fields, where
-# it is originally put by _remove_blob_cols .)
-  my %blobs_to_empty = map { ($_ => delete $fields->{$_}) } keys %$blob_cols;
-
-# We can't only update NULL blobs, because blobs cannot be in the WHERE clause.
-
-  $self->next::method($source, \%blobs_to_empty, $where, @rest);
-
-# Now update the blobs before the other columns in case the update of other
-# columns makes the search condition invalid.
-  $self->_update_blobs($source, $blob_cols, $where);
-
-  my @res;
-  if (%$fields) {
-    if ($wantarray) {
-      @res    = $self->next::method(@_);
-    }
-    elsif (defined $wantarray) {
-      $res[0] = $self->next::method(@_);
-    }
-    else {
-      $self->next::method(@_);
-    }
-  }
-
-  $guard->commit;
-
-  return $wantarray ? @res : $res[0];
-}
-
-sub insert_bulk {
-  my $self = shift;
-  my ($source, $cols, $data) = @_;
-
-  my $identity_col = List::Util::first
-    { $source->column_info($_)->{is_auto_increment} }
-    $source->columns;
-
-  my $is_identity_insert = (List::Util::first
-    { $_ eq $identity_col }
-    @{$cols}
-  ) ? 1 : 0;
-
-  my @source_columns = $source->columns;
-
-  my $use_bulk_api =
-    $self->_bulk_storage &&
-    $self->_get_dbh->{syb_has_blk};
-
-  if ((not $use_bulk_api) &&
-      (Scalar::Util::reftype($self->_dbi_connect_info->[0])||'') eq 'CODE' &&
-      (not $self->_bulk_disabled_due_to_coderef_connect_info_warned)) {
-    carp <<'EOF';
-Bulk API support disabled due to use of a CODEREF connect_info. Reverting to
-regular array inserts.
-EOF
-    $self->_bulk_disabled_due_to_coderef_connect_info_warned(1);
-  }
-
-  if (not $use_bulk_api) {
-    my $blob_cols = $self->_remove_blob_cols_array($source, $cols, $data);
-
-# _execute_array uses a txn anyway, but it ends too early in case we need to
-# select max(col) to get the identity for inserting blobs.
-    ($self, my $guard) = $self->{transaction_depth} == 0 ?
-      ($self->_writer_storage, $self->_writer_storage->txn_scope_guard)
-      :
-      ($self, undef);
-
-    local $self->{insert_bulk} = 1;
-
-    $self->next::method(@_);
-
-    if ($blob_cols) {
-      if ($is_identity_insert) {
-        $self->_insert_blobs_array ($source, $blob_cols, $cols, $data);
-      }
-      else {
-        my @cols_with_identities = (@$cols, $identity_col);
-
-        ## calculate identities
-        # XXX This assumes identities always increase by 1, which may or may not
-        # be true.
-        my ($last_identity) =
-          $self->_dbh->selectrow_array (
-            $self->_fetch_identity_sql($source, $identity_col)
-          );
-        my @identities = (($last_identity - @$data + 1) .. $last_identity);
-
-        my @data_with_identities = map [@$_, shift @identities], @$data;
-
-        $self->_insert_blobs_array (
-          $source, $blob_cols, \@cols_with_identities, \@data_with_identities
-        );
-      }
-    }
-
-    $guard->commit if $guard;
-
-    return;
-  }
-
-# otherwise, use the bulk API
-
-# rearrange @$data so that columns are in database order
-  my %orig_idx;
-  @orig_idx{@$cols} = 0..$#$cols;
-
-  my %new_idx;
-  @new_idx{@source_columns} = 0..$#source_columns;
-
-  my @new_data;
-  for my $datum (@$data) {
-    my $new_datum = [];
-    for my $col (@source_columns) {
-# identity data will be 'undef' if not $is_identity_insert
-# columns with defaults will also be 'undef'
-      $new_datum->[ $new_idx{$col} ] =
-        exists $orig_idx{$col} ? $datum->[ $orig_idx{$col} ] : undef;
-    }
-    push @new_data, $new_datum;
-  }
-
-# bcp identity index is 1-based
-  my $identity_idx = exists $new_idx{$identity_col} ?
-    $new_idx{$identity_col} + 1 : 0;
-
-## Set a client-side conversion error handler, straight from DBD::Sybase docs.
-# This ignores any data conversion errors detected by the client side libs, as
-# they are usually harmless.
-  my $orig_cslib_cb = DBD::Sybase::set_cslib_cb(
-    Sub::Name::subname insert_bulk => sub {
-      my ($layer, $origin, $severity, $errno, $errmsg, $osmsg, $blkmsg) = @_;
-
-      return 1 if $errno == 36;
-
-      carp
-        "Layer: $layer, Origin: $origin, Severity: $severity, Error: $errno" .
-        ($errmsg ? "\n$errmsg" : '') .
-        ($osmsg  ? "\n$osmsg"  : '')  .
-        ($blkmsg ? "\n$blkmsg" : '');
-
-      return 0;
-  });
-
-  eval {
-    my $bulk = $self->_bulk_storage;
-
-    my $guard = $bulk->txn_scope_guard;
-
-## XXX get this to work instead of our own $sth
-## will require SQLA or *Hacks changes for ordered columns
-#    $bulk->next::method($source, \@source_columns, \@new_data, {
-#      syb_bcp_attribs => {
-#        identity_flag   => $is_identity_insert,
-#        identity_column => $identity_idx,
-#      }
-#    });
-    my $sql = 'INSERT INTO ' .
-      $bulk->sql_maker->_quote($source->name) . ' (' .
-# colname list is ignored for BCP, but does no harm
-      (join ', ', map $bulk->sql_maker->_quote($_), @source_columns) . ') '.
-      ' VALUES ('.  (join ', ', ('?') x @source_columns) . ')';
-
-## XXX there's a bug in the DBD::Sybase bulk support that makes $sth->finish for
-## a prepare_cached statement ineffective. Replace with ->sth when fixed, or
-## better yet the version above. Should be fixed in DBD::Sybase .
-    my $sth = $bulk->_get_dbh->prepare($sql,
-#      'insert', # op
-      {
-        syb_bcp_attribs => {
-          identity_flag   => $is_identity_insert,
-          identity_column => $identity_idx,
-        }
-      }
-    );
-
-    my @bind = do {
-      my $idx = 0;
-      map [ $_, $idx++ ], @source_columns;
-    };
-
-    $self->_execute_array(
-      $source, $sth, \@bind, \@source_columns, \@new_data, sub {
-        $guard->commit
-      }
-    );
-
-    $bulk->_query_end($sql);
-  };
-
-  my $exception = $@;
-  DBD::Sybase::set_cslib_cb($orig_cslib_cb);
-
-  if ($exception =~ /-Y option/) {
-    carp <<"EOF";
-
-Sybase bulk API operation failed due to character set incompatibility, reverting
-to regular array inserts:
-
-*** Try unsetting the LANG environment variable.
-
-$exception
-EOF
-    $self->_bulk_storage(undef);
-    unshift @_, $self;
-    goto \&insert_bulk;
-  }
-  elsif ($exception) {
-# rollback makes the bulkLogin connection unusable
-    $self->_bulk_storage->disconnect;
-    $self->throw_exception($exception);
-  }
-}
-
-sub _dbh_execute_array {
-  my ($self, $sth, $tuple_status, $cb) = @_;
-
-  my $rv = $self->next::method($sth, $tuple_status);
-  $cb->() if $cb;
-
-  return $rv;
-}
-
-# Make sure blobs are not bound as placeholders, and return any non-empty ones
-# as a hash.
-sub _remove_blob_cols {
-  my ($self, $source, $fields) = @_;
-
-  my %blob_cols;
-
-  for my $col (keys %$fields) {
-    if ($self->_is_lob_column($source, $col)) {
-      my $blob_val = delete $fields->{$col};
-      if (not defined $blob_val) {
-        $fields->{$col} = \'NULL';
-      }
-      else {
-        $fields->{$col} = \"''";
-        $blob_cols{$col} = $blob_val unless $blob_val eq '';
-      }
-    }
-  }
-
-  return %blob_cols ? \%blob_cols : undef;
-}
-
-# same for insert_bulk
-sub _remove_blob_cols_array {
-  my ($self, $source, $cols, $data) = @_;
-
-  my @blob_cols;
-
-  for my $i (0..$#$cols) {
-    my $col = $cols->[$i];
-
-    if ($self->_is_lob_column($source, $col)) {
-      for my $j (0..$#$data) {
-        my $blob_val = delete $data->[$j][$i];
-        if (not defined $blob_val) {
-          $data->[$j][$i] = \'NULL';
-        }
-        else {
-          $data->[$j][$i] = \"''";
-          $blob_cols[$j][$i] = $blob_val
-            unless $blob_val eq '';
-        }
-      }
-    }
-  }
-
-  return @blob_cols ? \@blob_cols : undef;
-}
-
-sub _update_blobs {
-  my ($self, $source, $blob_cols, $where) = @_;
-
-  my (@primary_cols) = $source->primary_columns;
-
-  $self->throw_exception('Cannot update TEXT/IMAGE column(s) without a primary key')
-    unless @primary_cols;
-
-# check if we're updating a single row by PK
-  my $pk_cols_in_where = 0;
-  for my $col (@primary_cols) {
-    $pk_cols_in_where++ if defined $where->{$col};
-  }
-  my @rows;
-
-  if ($pk_cols_in_where == @primary_cols) {
-    my %row_to_update;
-    @row_to_update{@primary_cols} = @{$where}{@primary_cols};
-    @rows = \%row_to_update;
-  } else {
-    my $cursor = $self->select ($source, \@primary_cols, $where, {});
-    @rows = map {
-      my %row; @row{@primary_cols} = @$_; \%row
-    } $cursor->all;
-  }
-
-  for my $row (@rows) {
-    $self->_insert_blobs($source, $blob_cols, $row);
-  }
-}
-
-sub _insert_blobs {
-  my ($self, $source, $blob_cols, $row) = @_;
-  my $dbh = $self->_get_dbh;
-
-  my $table = $source->name;
-
-  my %row = %$row;
-  my (@primary_cols) = $source->primary_columns;
-
-  $self->throw_exception('Cannot update TEXT/IMAGE column(s) without a primary key')
-    unless @primary_cols;
-
-  $self->throw_exception('Cannot update TEXT/IMAGE column(s) without primary key values')
-    if ((grep { defined $row{$_} } @primary_cols) != @primary_cols);
-
-  for my $col (keys %$blob_cols) {
-    my $blob = $blob_cols->{$col};
-
-    my %where = map { ($_, $row{$_}) } @primary_cols;
-
-    my $cursor = $self->select ($source, [$col], \%where, {});
-    $cursor->next;
-    my $sth = $cursor->sth;
-
-    if (not $sth) {
-
-      $self->throw_exception(
-          "Could not find row in table '$table' for blob update:\n"
-        . Data::Dumper::Concise::Dumper (\%where)
-      );
-    }
-
-    eval {
-      do {
-        $sth->func('CS_GET', 1, 'ct_data_info') or die $sth->errstr;
-      } while $sth->fetch;
-
-      $sth->func('ct_prepare_send') or die $sth->errstr;
-
-      my $log_on_update = $self->_blob_log_on_update;
-      $log_on_update    = 1 if not defined $log_on_update;
-
-      $sth->func('CS_SET', 1, {
-        total_txtlen => length($blob),
-        log_on_update => $log_on_update
-      }, 'ct_data_info') or die $sth->errstr;
-
-      $sth->func($blob, length($blob), 'ct_send_data') or die $sth->errstr;
-
-      $sth->func('ct_finish_send') or die $sth->errstr;
-    };
-    my $exception = $@;
-    $sth->finish if $sth;
-    if ($exception) {
-      if ($self->using_freetds) {
-        $self->throw_exception (
-          'TEXT/IMAGE operation failed, probably because you are using FreeTDS: '
-          . $exception
-        );
-      } else {
-        $self->throw_exception($exception);
-      }
-    }
-  }
-}
-
-sub _insert_blobs_array {
-  my ($self, $source, $blob_cols, $cols, $data) = @_;
-
-  for my $i (0..$#$data) {
-    my $datum = $data->[$i];
-
-    my %row;
-    @row{ @$cols } = @$datum;
-
-    my %blob_vals;
-    for my $j (0..$#$cols) {
-      if (exists $blob_cols->[$i][$j]) {
-        $blob_vals{ $cols->[$j] } = $blob_cols->[$i][$j];
-      }
-    }
-
-    $self->_insert_blobs ($source, \%blob_vals, \%row);
-  }
-}
-
-=head2 connect_call_datetime_setup
-
-Used as:
-
-  on_connect_call => 'datetime_setup'
-
-In L<DBIx::Class::Storage::DBI/connect_info> to set:
-
-  $dbh->syb_date_fmt('ISO_strict'); # output fmt: 2004-08-21T14:36:48.080Z
-  $dbh->do('set dateformat mdy');   # input fmt:  08/13/1979 18:08:55.080
-
-On connection for use with L<DBIx::Class::InflateColumn::DateTime>, using
-L<DateTime::Format::Sybase>, which you will need to install.
-
-This works for both C<DATETIME> and C<SMALLDATETIME> columns, although
-C<SMALLDATETIME> columns only have minute precision.
-
-=cut
-
-{
-  my $old_dbd_warned = 0;
-
-  sub connect_call_datetime_setup {
-    my $self = shift;
-    my $dbh = $self->_get_dbh;
-
-    if ($dbh->can('syb_date_fmt')) {
-      # amazingly, this works with FreeTDS
-      $dbh->syb_date_fmt('ISO_strict');
-    } elsif (not $old_dbd_warned) {
-      carp "Your DBD::Sybase is too old to support ".
-      "DBIx::Class::InflateColumn::DateTime, please upgrade!";
-      $old_dbd_warned = 1;
-    }
-
-    $dbh->do('SET DATEFORMAT mdy');
-
-    1;
-  }
-}
-
-sub datetime_parser_type { "DateTime::Format::Sybase" }
-
-# ->begin_work and such have no effect with FreeTDS but we run them anyway to
-# let the DBD keep any state it needs to.
-#
-# If they ever do start working, the extra statements will do no harm (because
-# Sybase supports nested transactions.)
-
-sub _dbh_begin_work {
-  my $self = shift;
-
-# bulkLogin=1 connections are always in a transaction, and can only call BEGIN
-# TRAN once. However, we need to make sure there's a $dbh.
-  return if $self->_is_bulk_storage && $self->_dbh && $self->_began_bulk_work;
-
-  $self->next::method(@_);
-
-  if ($self->using_freetds) {
-    $self->_get_dbh->do('BEGIN TRAN');
-  }
-
-  $self->_began_bulk_work(1) if $self->_is_bulk_storage;
-}
-
-sub _dbh_commit {
-  my $self = shift;
-  if ($self->using_freetds) {
-    $self->_dbh->do('COMMIT');
-  }
-  return $self->next::method(@_);
-}
-
-sub _dbh_rollback {
-  my $self = shift;
-  if ($self->using_freetds) {
-    $self->_dbh->do('ROLLBACK');
-  }
-  return $self->next::method(@_);
-}
-
-# savepoint support using ASE syntax
-
-sub _svp_begin {
-  my ($self, $name) = @_;
-
-  $self->_get_dbh->do("SAVE TRANSACTION $name");
-}
-
-# A new SAVE TRANSACTION with the same name releases the previous one.
-sub _svp_release { 1 }
-
-sub _svp_rollback {
-  my ($self, $name) = @_;
-
-  $self->_get_dbh->do("ROLLBACK TRANSACTION $name");
-}
-
-1;
-
-=head1 Schema::Loader Support
-
-There is an experimental branch of L<DBIx::Class::Schema::Loader> that will
-allow you to dump a schema from most (if not all) versions of Sybase.
-
-It is available via subversion from:
-
-  http://dev.catalyst.perl.org/repos/bast/branches/DBIx-Class-Schema-Loader/current/
-
-=head1 FreeTDS
-
-This driver supports L<DBD::Sybase> compiled against FreeTDS
-(L<http://www.freetds.org/>) to the best of our ability, however it is
-recommended that you recompile L<DBD::Sybase> against the Sybase Open Client
-libraries. They are a part of the Sybase ASE distribution:
-
-The Open Client FAQ is here:
-L<http://www.isug.com/Sybase_FAQ/ASE/section7.html>.
-
-Sybase ASE for Linux (which comes with the Open Client libraries) may be
-downloaded here: L<http://response.sybase.com/forms/ASE_Linux_Download>.
-
-To see if you're using FreeTDS check C<< $schema->storage->using_freetds >>, or run:
-
-  perl -MDBI -le 'my $dbh = DBI->connect($dsn, $user, $pass); print $dbh->{syb_oc_version}'
-
-Some versions of the libraries involved will not support placeholders, in which
-case the storage will be reblessed to
-L<DBIx::Class::Storage::DBI::Sybase::NoBindVars>.
-
-In some configurations, placeholders will work but will throw implicit type
-conversion errors for anything that's not expecting a string. In such a case,
-the C<auto_cast> option from L<DBIx::Class::Storage::DBI::AutoCast> is
-automatically set, which you may enable on connection with
-L<DBIx::Class::Storage::DBI::AutoCast/connect_call_set_auto_cast>. The type info
-for the C<CAST>s is taken from the L<DBIx::Class::ResultSource/data_type>
-definitions in your Result classes, and are mapped to a Sybase type (if it isn't
-already) using a mapping based on L<SQL::Translator>.
-
-In other configurations, placeholers will work just as they do with the Sybase
-Open Client libraries.
-
-Inserts or updates of TEXT/IMAGE columns will B<NOT> work with FreeTDS.
-
-=head1 INSERTS WITH PLACEHOLDERS
-
-With placeholders enabled, inserts are done in a transaction so that there are
-no concurrency issues with getting the inserted identity value using
-C<SELECT MAX(col)>, which is the only way to get the C<IDENTITY> value in this
-mode.
-
-In addition, they are done on a separate connection so that it's possible to
-have active cursors when doing an insert.
-
-When using C<DBIx::Class::Storage::DBI::Sybase::NoBindVars> transactions are
-disabled, as there are no concurrency issues with C<SELECT @@IDENTITY> as it's a
-session variable.
-
-=head1 TRANSACTIONS
-
-Due to limitations of the TDS protocol, L<DBD::Sybase>, or both; you cannot
-begin a transaction while there are active cursors; nor can you use multiple
-active cursors within a transaction. An active cursor is, for example, a
-L<ResultSet|DBIx::Class::ResultSet> that has been executed using C<next> or
-C<first> but has not been exhausted or L<reset|DBIx::Class::ResultSet/reset>.
-
-For example, this will not work:
-
-  $schema->txn_do(sub {
-    my $rs = $schema->resultset('Book');
-    while (my $row = $rs->next) {
-      $schema->resultset('MetaData')->create({
-        book_id => $row->id,
-        ...
-      });
-    }
-  });
-
-This won't either:
-
-  my $first_row = $large_rs->first;
-  $schema->txn_do(sub { ... });
-
-Transactions done for inserts in C<AutoCommit> mode when placeholders are in use
-are not affected, as they are done on an extra database handle.
-
-Some workarounds:
-
-=over 4
-
-=item * use L<DBIx::Class::Storage::DBI::Replicated>
-
-=item * L<connect|DBIx::Class::Schema/connect> another L<Schema|DBIx::Class::Schema>
-
-=item * load the data from your cursor with L<DBIx::Class::ResultSet/all>
-
-=back
-
-=head1 MAXIMUM CONNECTIONS
-
-The TDS protocol makes separate connections to the server for active statements
-in the background. By default the number of such connections is limited to 25,
-on both the client side and the server side.
-
-This is a bit too low for a complex L<DBIx::Class> application, so on connection
-the client side setting is set to C<256> (see L<DBD::Sybase/maxConnect>.) You
-can override it to whatever setting you like in the DSN.
-
-See
-L<http://infocenter.sybase.com/help/index.jsp?topic=/com.sybase.help.ase_15.0.sag1/html/sag1/sag1272.htm>
-for information on changing the setting on the server side.
-
-=head1 DATES
-
-See L</connect_call_datetime_setup> to setup date formats
-for L<DBIx::Class::InflateColumn::DateTime>.
-
-=head1 TEXT/IMAGE COLUMNS
-
-L<DBD::Sybase> compiled with FreeTDS will B<NOT> allow you to insert or update
-C<TEXT/IMAGE> columns.
-
-Setting C<< $dbh->{LongReadLen} >> will also not work with FreeTDS use either:
-
-  $schema->storage->dbh->do("SET TEXTSIZE $bytes");
-
-or
-
-  $schema->storage->set_textsize($bytes);
-
-instead.
-
-However, the C<LongReadLen> you pass in
-L<DBIx::Class::Storage::DBI/connect_info> is used to execute the equivalent
-C<SET TEXTSIZE> command on connection.
-
-See L</connect_call_blob_setup> for a L<DBIx::Class::Storage::DBI/connect_info>
-setting you need to work with C<IMAGE> columns.
-
-=head1 BULK API
-
-The experimental L<DBD::Sybase> Bulk API support is used for
-L<populate|DBIx::Class::ResultSet/populate> in B<void> context, in a transaction
-on a separate connection.
-
-To use this feature effectively, use a large number of rows for each
-L<populate|DBIx::Class::ResultSet/populate> call, eg.:
-
-  while (my $rows = $data_source->get_100_rows()) {
-    $rs->populate($rows);
-  }
-
-B<NOTE:> the L<add_columns|DBIx::Class::ResultSource/add_columns>
-calls in your C<Result> classes B<must> list columns in database order for this
-to work. Also, you may have to unset the C<LANG> environment variable before
-loading your app, if it doesn't match the character set of your database.
-
-When inserting IMAGE columns using this method, you'll need to use
-L</connect_call_blob_setup> as well.
-
-=head1 TODO
-
-=over
-
-=item *
-
-Transitions to AutoCommit=0 (starting a transaction) mode by exhausting
-any active cursors, using eager cursors.
-
-=item *
-
-Real limits and limited counts using stored procedures deployed on startup.
-
-=item *
-
-Adaptive Server Anywhere (ASA) support, with possible SQLA::Limit support.
-
-=item *
-
-Blob update with a LIKE query on a blob, without invalidating the WHERE condition.
-
-=item *
-
-bulk_insert using prepare_cached (see comments.)
-
-=back
-
-=head1 AUTHOR
-
-See L<DBIx::Class/CONTRIBUTORS>.
-
-=head1 LICENSE
-
-You may distribute this code under the same terms as Perl itself.
-
-=cut
-# vim:sts=2 sw=2:

Copied: DBIx-Class/0.08/branches/sybase_refactor/lib/DBIx/Class/Storage/DBI/Sybase.pm (from rev 7933, DBIx-Class/0.08/branches/sybase_refactor/lib/DBIx/Class/Storage/DBI/Sybase/Common.pm)
===================================================================
--- DBIx-Class/0.08/branches/sybase_refactor/lib/DBIx/Class/Storage/DBI/Sybase.pm	                        (rev 0)
+++ DBIx-Class/0.08/branches/sybase_refactor/lib/DBIx/Class/Storage/DBI/Sybase.pm	2009-11-23 00:06:48 UTC (rev 7934)
@@ -0,0 +1,132 @@
+package DBIx::Class::Storage::DBI::Sybase;
+
+use strict;
+use warnings;
+
+use base qw/DBIx::Class::Storage::DBI/;
+
+=head1 NAME
+
+DBIx::Class::Storage::DBI::Sybase::Common - Base class for drivers using
+DBD::Sybase
+
+=head1 DESCRIPTION
+
+This is the base class/dispatcher for Storage's designed to work with
+L<DBD::Sybase>
+
+=head1 METHODS
+
+=cut
+
+sub _rebless {
+  my $self = shift;
+
+  my $dbtype = eval {
+    @{$self->_get_dbh->selectrow_arrayref(qq{sp_server_info \@attribute_id=1})}[2]
+  };
+
+  $self->throw_exception("Unable to estable connection to determine database type: $@")
+    if $@;
+
+  if ($dbtype) {
+    $dbtype =~ s/\W/_/gi;
+
+    # saner class name
+    $dbtype = 'ASE' if $dbtype eq 'SQL_Server';
+
+    my $subclass = __PACKAGE__ . "::$dbtype";
+    if ($self->load_optional_class($subclass)) {
+      bless $self, $subclass;
+      $self->_rebless;
+    }
+  }
+}
+
+sub _ping {
+  my $self = shift;
+
+  my $dbh = $self->_dbh or return 0;
+
+  local $dbh->{RaiseError} = 1;
+  local $dbh->{PrintError} = 0;
+
+  if ($dbh->{syb_no_child_con}) {
+# if extra connections are not allowed, then ->ping is reliable
+    my $ping = eval { $dbh->ping };
+    return $@ ? 0 : $ping;
+  }
+
+  eval {
+# XXX if the main connection goes stale, does opening another for this statement
+# really determine anything?
+    $dbh->do('select 1');
+  };
+
+  return $@ ? 0 : 1;
+}
+
+sub _set_max_connect {
+  my $self = shift;
+  my $val  = shift || 256;
+
+  my $dsn = $self->_dbi_connect_info->[0];
+
+  return if ref($dsn) eq 'CODE';
+
+  if ($dsn !~ /maxConnect=/) {
+    $self->_dbi_connect_info->[0] = "$dsn;maxConnect=$val";
+    my $connected = defined $self->_dbh;
+    $self->disconnect;
+    $self->ensure_connected if $connected;
+  }
+}
+
+=head2 using_freetds
+
+Whether or not L<DBD::Sybase> was compiled against FreeTDS. If false, it means
+the Sybase OpenClient libraries were used.
+
+=cut
+
+sub using_freetds {
+  my $self = shift;
+
+  return $self->_get_dbh->{syb_oc_version} =~ /freetds/i;
+}
+
+=head2 set_textsize
+
+When using FreeTDS and/or MSSQL, C<< $dbh->{LongReadLen} >> is not available,
+use this function instead. It does:
+
+  $dbh->do("SET TEXTSIZE $bytes");
+
+Takes the number of bytes, or uses the C<LongReadLen> value from your
+L<DBIx::Class/connect_info> if omitted, lastly falls back to the C<32768> which
+is the L<DBD::Sybase> default.
+
+=cut
+
+sub set_textsize {
+  my $self = shift;
+  my $text_size = shift ||
+    eval { $self->_dbi_connect_info->[-1]->{LongReadLen} } ||
+    32768; # the DBD::Sybase default
+
+  return unless defined $text_size;
+
+  $self->_dbh->do("SET TEXTSIZE $text_size");
+}
+
+1;
+
+=head1 AUTHORS
+
+See L<DBIx::Class/CONTRIBUTORS>.
+
+=head1 LICENSE
+
+You may distribute this code under the same terms as Perl itself.
+
+=cut




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