X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FDBIx%2FClass%2FStorage%2FDBI%2FSybase.pm;h=8c5f988dcfaf00cf57cc28708a40f6a37cde6076;hb=fecb38cba68186d579ef96f89bf6ce557e55ab1c;hp=fe383596feaac32866df8d35f01fea10b28b237e;hpb=f0070d01c1ebc3895551ff52580c544e180e7bcf;p=dbsrgits%2FDBIx-Class-Historic.git

diff --git a/lib/DBIx/Class/Storage/DBI/Sybase.pm b/lib/DBIx/Class/Storage/DBI/Sybase.pm
index fe38359..8c5f988 100644
--- a/lib/DBIx/Class/Storage/DBI/Sybase.pm
+++ b/lib/DBIx/Class/Storage/DBI/Sybase.pm
@@ -5,111 +5,128 @@ use warnings;
 
 use base qw/DBIx::Class::Storage::DBI/;
 
-use Carp::Clan qw/^DBIx::Class/;
+=head1 NAME
+
+DBIx::Class::Storage::DBI::Sybase - Base class for drivers using
+L<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;
 
-  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 $dbtype = eval {
+    @{$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 $@;
 
-    my $exception = $@;
+  if ($dbtype) {
     $dbtype =~ s/\W/_/gi;
-    my $subclass = "DBIx::Class::Storage::DBI::Sybase::${dbtype}";
 
-    if (!$exception && $dbtype && $self->load_optional_class($subclass)) {
+    # 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;
-    } elsif (not $self->dbh->{syb_dynamic_supported}) {
-      bless $self, 'DBIx::Class::Storage:DBI::Sybase::NoBindVars';
-      $self->_rebless;
     }
   }
 }
 
-{
-  my $old_dbd_warned = 0;
+sub _ping {
+  my $self = shift;
 
-  sub _populate_dbh {
-    my $self = shift;
-    $self->next::method(@_);
-    my $dbh = $self->_dbh;
+  my $dbh = $self->_dbh or return 0;
 
-    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;
-    }
+  local $dbh->{RaiseError} = 1;
+  local $dbh->{PrintError} = 0;
 
-    $dbh->do('set dateformat mdy');
-
-    1;
+  if ($dbh->{syb_no_child_con}) {
+# if extra connections are not allowed, then ->ping is reliable
+    my $ping = eval { $dbh->ping };
+    return $@ ? 0 : $ping;
   }
-}
 
-sub _dbh_last_insert_id {
-  my ($self, $dbh, $source, $col) = @_;
+  eval {
+# XXX if the main connection goes stale, does opening another for this statement
+# really determine anything?
+    $dbh->do('select 1');
+  };
 
-  # sorry, there's no other way!
-  my $sth = $dbh->prepare_cached("select max($col) from ".$source->from);
-  return ($dbh->selectrow_array($sth))[0];
+  return $@ ? 0 : 1;
 }
 
-sub datetime_parser_type { "DBIx::Class::Storage::DBI::Sybase::DateTime" }
+sub _set_max_connect {
+  my $self = shift;
+  my $val  = shift || 256;
 
-1;
+  my $dsn = $self->_dbi_connect_info->[0];
 
-=head1 NAME
+  return if ref($dsn) eq 'CODE';
 
-DBIx::Class::Storage::DBI::Sybase - Storage::DBI subclass for Sybase
+  if ($dsn !~ /maxConnect=/) {
+    $self->_dbi_connect_info->[0] = "$dsn;maxConnect=$val";
+    my $connected = defined $self->_dbh;
+    $self->disconnect;
+    $self->ensure_connected if $connected;
+  }
+}
 
-=head1 SYNOPSIS
+=head2 using_freetds
 
-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>.
+Whether or not L<DBD::Sybase> was compiled against FreeTDS. If false, it means
+the Sybase OpenClient libraries were used.
 
-=head1 CAVEATS
+=cut
+
+sub using_freetds {
+  my $self = shift;
 
-If your version of Sybase does not support placeholders, then this storage
-driver uses L<DBIx::Class::Storage::DBI::NoBindVars> as a base,
+  return $self->_get_dbh->{syb_oc_version} =~ /freetds/i;
+}
 
-In which case, bind variables will be interpolated (properly quoted of course)
-into the SQL query itself, without using bind placeholders.
+=head2 set_textsize
 
-More importantly this means that caching of prepared statements is explicitly
-disabled, as the interpolation renders it useless.
+When using FreeTDS and/or MSSQL, C<< $dbh->{LongReadLen} >> is not available,
+use this function instead. It does:
 
-If your version of Sybase B<DOES> support placeholders (check
-C<<$dbh->{syb_dynamic_supported}>> then unfortunately there's no way to get the
-C<last_insert_id> without doing a C<select max(col)>.
+  $dbh->do("SET TEXTSIZE $bytes");
 
-But your queries will be cached.
+Takes the number of bytes, or uses the C<LongReadLen> value from your
+L<connect_info|DBIx::Class::Storage::DBI/connect_info> if omitted, lastly falls
+back to the C<32768> which is the L<DBD::Sybase> default.
 
-=head1 DATES
+=cut
 
-On connection C<syb_date_fmt> is set to C<ISO_strict>, e.g.:
-C<2004-08-21T14:36:48.080Z> and C<dateformat> is set to C<mdy>, e.g.:
-C<08/13/1979>.
+sub set_textsize {
+  my $self = shift;
+  my $text_size = shift ||
+    eval { $self->_dbi_connect_info->[-1]->{LongReadLen} } ||
+    32768; # the DBD::Sybase default
 
-You will need the L<DateTime::Format::Strptime> module if you are going to use
-L<DBIx::Class::InflateColumn::DateTime>.
+  return unless defined $text_size;
 
-=head1 AUTHORS
+  $self->_dbh->do("SET TEXTSIZE $text_size");
+}
 
-Brandon L Black <blblack@gmail.com>
+1;
 
-Justin Hunter <justin.d.hunter@gmail.com>
+=head1 AUTHORS
 
-Rafael Kitover <rkitover@cpan.org>
+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: