cleanups

[dbsrgits/DBIx-Class.git] / lib / DBIx / Class / Storage / DBI / Sybase / NoBindVars.pm

diff --git a/lib/DBIx/Class/Storage/DBI/Sybase/NoBindVars.pm b/lib/DBIx/Class/Storage/DBI/Sybase/NoBindVars.pm
index 72a7372..8f80c3d 100644 (file)
--- a/lib/DBIx/Class/Storage/DBI/Sybase/NoBindVars.pm
+++ b/lib/DBIx/Class/Storage/DBI/Sybase/NoBindVars.pm
@@ -1,9 +1,94 @@
-package # hide from PAUSE
-    DBIx::Class::Storage::DBI::Sybase::NoBindVars;
+package DBIx::Class::Storage::DBI::Sybase::NoBindVars;
 
+use Class::C3;
 use base qw/
   DBIx::Class::Storage::DBI::NoBindVars
   DBIx::Class::Storage::DBI::Sybase
 /;
+use List::Util ();
+use Scalar::Util ();
+
+sub _dbh_last_insert_id {
+  my ($self, $dbh, $source, $col) = @_;
+
+  # @@identity works only if not using placeholders
+  # Should this query be cached?
+  return ($dbh->selectrow_array('select @@identity'))[0];
+}
+
+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 should_quote {
+  my $self = shift;
+  my ($type, $value) = @_;
+
+  return $self->next::method(@_) if not defined $value;
+
+  $type ||= '';
+
+  if (my $key = List::Util::first { $type =~ /$_/i } keys %noquote) {
+    return 0 if $noquote{$key}->($value);
+  } elsif (not $type) {
+# try to guess based on value
+    return 0 if $number->($value) || $noquote->{money}->($value);
+  }
+
+  return $self->next::method(@_);
+}
 
 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 does not support
+placeholders. You can check with:
+
+  $dbh->{syb_dynamic_supported}
+
+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)> 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: