X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FDBIx%2FClass%2FStorage%2FDBI%2FSybase.pm;h=d92a60e2e8ad11b3cb1d98f84350d595c9d14a91;hb=9041a97a57cd2831d20e3b25772b29f9af3d8ef9;hp=2fe0b83562ce3565686810b7ab6e3273b0338af4;hpb=98464041fda64549ac43bb13393bf4f9a53e30cb;p=dbsrgits%2FDBIx-Class.git

diff --git a/lib/DBIx/Class/Storage/DBI/Sybase.pm b/lib/DBIx/Class/Storage/DBI/Sybase.pm
index 2fe0b83..d92a60e 100644
--- a/lib/DBIx/Class/Storage/DBI/Sybase.pm
+++ b/lib/DBIx/Class/Storage/DBI/Sybase.pm
@@ -3,20 +3,151 @@ package DBIx::Class::Storage::DBI::Sybase;
 use strict;
 use warnings;
 
-use base qw/DBIx::Class::Storage::DBI::NoBindVars/;
+use Class::C3;
+use base qw/DBIx::Class::Storage::DBI/;
+
+use Carp::Clan qw/^DBIx::Class/;
 
 sub _rebless {
+  my $self = shift;
+
+  if (ref($self) eq 'DBIx::Class::Storage::DBI::Sybase') {
+    my $dbtype = eval {
+      @{$self->dbh->selectrow_arrayref(qq{sp_server_info \@attribute_id=1})}[2]
+    } || '';
+
+    my $exception = $@;
+    $dbtype =~ s/\W/_/gi;
+    my $subclass = "DBIx::Class::Storage::DBI::Sybase::${dbtype}";
+
+    if (!$exception && $dbtype && $self->load_optional_class($subclass)) {
+      bless $self, $subclass;
+      $self->_rebless;
+    } else {
+      # real Sybase
+      if (not $self->dbh->{syb_dynamic_supported}) {
+        bless $self, 'DBIx::Class::Storage:DBI::Sybase::NoBindVars';
+        $self->_rebless;
+      }
+      $self->connect_call_datetime_setup;
+      $self->connect_call_blob_setup;
+    }
+  }
+}
+
+sub _populate_dbh {
+  my $self = shift;
+  $self->next::method(@_);
+  $self->connect_call_datetime_setup;
+  $self->connect_call_blob_setup;
+  1;
+}
+
+=head2 connect_call_blob_setup
+
+Used as:
+
+  on_connect_call => 'blob_setup'
+
+Does C<< $dbh->{syb_binary_images} = 1; >> to return C<IMAGE> data as raw binary
+instead of as a hex string.
+
+Recommended.
+
+=cut
+
+sub connect_call_blob_setup {
+  my $self = shift;
+  my $dbh = $self->_dbh;
+  $dbh->{syb_binary_images} = 1;
+}
+
+=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->_dbh;
 
-    my $dbtype = eval { @{$self->_dbh->selectrow_arrayref(qq{sp_server_info \@attribute_id=1})}[2] };
-    unless ( $@ ) {
-        $dbtype =~ s/\W/_/gi;
-        my $subclass = "DBIx::Class::Storage::DBI::Sybase::${dbtype}";
-        if ($self->load_optional_class($subclass) && !$self->isa($subclass)) {
-            bless $self, $subclass;
-            $self->_rebless;
-        }
+    if ($dbh->can('syb_date_fmt')) {
+      $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;
     }
+
+    $dbh->do('set dateformat mdy');
+
+    1;
+  }
+}
+
+sub datetime_parser_type { "DateTime::Format::Sybase" }
+
+sub _dbh_last_insert_id {
+  my ($self, $dbh, $source, $col) = @_;
+
+  # sorry, there's no other way!
+  my $sth = $dbh->prepare_cached("select max($col) from ".$source->from);
+  return ($dbh->selectrow_array($sth))[0];
+}
+
+=head2 count
+
+Counts for limited queries are emulated by executing select queries and
+returning the number of successful executions minus the offset.
+
+This is necessary due to the limitations of Sybase.
+
+=cut
+
+sub count {
+  my $self = shift;
+  my ($source, $attrs) = @_;
+
+  if (not exists $attrs->{rows}) {
+    return $self->next::method(@_);
+  }
+
+  my $offset = $attrs->{offset} || 0;
+  my $total  = $attrs->{rows} + $offset;
+
+  my $new_attrs = $self->_copy_attributes_for_count($source, $attrs);
+
+  my $first_pk = ($source->primary_columns)[0];
+
+  $new_attrs->{select} = $first_pk ? "me.$first_pk" : 1;
+
+  my $tmp_rs = $source->resultset_class->new($source, $new_attrs);
+
+  $self->dbh->{syb_rowcount} = $total;
+
+  my $count = 0;
+  $count++ while $tmp_rs->cursor->next;
+
+  $self->dbh->{syb_rowcount} = 0;
+
+  return $count - $offset;
 }
 
 1;
@@ -27,18 +158,45 @@ DBIx::Class::Storage::DBI::Sybase - Storage::DBI subclass for Sybase
 
 =head1 SYNOPSIS
 
-This subclass supports L<DBD::Sybase> for real Sybase databases.  If
-you are using an MSSQL database via L<DBD::Sybase>, see
-L<DBIx::Class::Storage::DBI::Sybase::MSSQL>.
+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 AUTHORS
+=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)>.
+
+But your queries will be cached.
+
+A recommended L<DBIx::Class::Storage::DBI/connect_info> setting:
 
-Brandon L Black <blblack@gmail.com>
+  on_connect_call => [qw/datetime_setup blob_setup/]
+
+=head1 DATES
+
+See L</connect_call_datetime_setup> to setup date formats
+for L<DBIx::Class::InflateColumn::DateTime>.
+
+=head1 IMAGE AND TEXT COLUMNS
+
+See L</connect_call_blob_setup> for a L<DBIx::Class::Storage::DBI/connect_info>
+setting you need to work with C<IMAGE> columns.
+
+Due to limitations in L<DBD::Sybase> and this driver, it is only possible to
+select one C<TEXT> or C<IMAGE> column at a time.
+
+=head1 AUTHORS
 
-Justin Hunter <justin.d.hunter@gmail.com>
+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: