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=c9850194ce85b708750bfe30c7c742855b9ef0af;hpb=7d17f469081c4932520458014b820daa8d3e986e;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 c985019..8c5f988 100644
--- a/lib/DBIx/Class/Storage/DBI/Sybase.pm
+++ b/lib/DBIx/Class/Storage/DBI/Sybase.pm
@@ -3,330 +3,124 @@ package DBIx::Class::Storage::DBI::Sybase;
 use strict;
 use warnings;
 
-use Class::C3;
 use base qw/DBIx::Class::Storage::DBI/;
 
-use Carp::Clan qw/^DBIx::Class/;
-
 =head1 NAME
 
-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>, your storage will be reblessed to
-L<DBIx::Class::Storage::DBI::Sybase::Microsoft_SQL_Server>.
+DBIx::Class::Storage::DBI::Sybase - Base class for drivers using
+L<DBD::Sybase>
 
 =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> settings:
-
-  on_connect_call => [['datetime_setup'], [blob_setup => log_on_update => 0]]
+This is the base class/dispatcher for Storage's designed to work with
+L<DBD::Sybase>
 
 =head1 METHODS
 
 =cut
 
-__PACKAGE__->mk_group_accessors('simple' =>
-    qw/_blob_log_on_update/
-);
-
 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;
-    } else {
-      # real Sybase
-      if (not $self->dbh->{syb_dynamic_supported}) {
-        bless $self, 'DBIx::Class::Storage:DBI::Sybase::NoBindVars';
-        $self->_rebless;
-      }
     }
   }
 }
 
-=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.
+sub _ping {
+  my $self = shift;
 
-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.
+  my $dbh = $self->_dbh or return 0;
 
-See
-L<DBD::Sybase/Handling_IMAGE/TEXT_data_with_syb_ct_get_data()/syb_ct_send_data()>.
+  local $dbh->{RaiseError} = 1;
+  local $dbh->{PrintError} = 0;
 
-=cut
+  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 connect_call_blob_setup {
-  my $self = shift;
-  my %args = @_;
-  my $dbh = $self->_dbh;
-  $dbh->{syb_binary_images} = 1;
+  eval {
+# XXX if the main connection goes stale, does opening another for this statement
+# really determine anything?
+    $dbh->do('select 1');
+  };
 
-  $self->_blob_log_on_update($args{log_on_update})
-    if exists $args{log_on_update};
+  return $@ ? 0 : 1;
 }
 
-sub _is_lob_type {
+sub _set_max_connect {
   my $self = shift;
-  shift =~ /(?:text|image|lob|bytea|binary)/i;
-}
-
-sub insert {
-  my ($self, $source, $to_insert) = splice @_, 0, 3;
-
-  my $blob_cols = $self->_remove_blob_cols($source, $to_insert);
+  my $val  = shift || 256;
 
-  my $updated_cols = $self->next::method($source, $to_insert, @_);
+  my $dsn = $self->_dbi_connect_info->[0];
 
-  $self->_update_blobs($source, $blob_cols, $to_insert) if %$blob_cols;
+  return if ref($dsn) eq 'CODE';
 
-  return $updated_cols;
-}
-
-#sub update {
-#  my ($self, $source) = splice @_, 0, 2;
-#  my ($fields)        = @_;
-#
-#  my $blob_cols = $self->_remove_blob_cols($source, $fields);
-#
-#  my @res = 1;
-#
-#  if (%$fields) {
-#    if (wantarray) {
-#      @res    = $self->next::method($source, @_);
-#    } else {
-#      $res[0] = $self->next::method($source, @_);
-#    }
-#  }
-#
-#  $self->_update_blobs($source, $blob_cols, $fields) if %$blob_cols;
-#
-#  return wantarray ? @res : $res[0];
-#}
-
-sub _remove_blob_cols {
-  my ($self, $source, $fields) = @_;
-
-  my %blob_cols;
-
-  for my $col (keys %$fields) {
-    $blob_cols{$col} = delete $fields->{$col}
-      if $self->_is_lob_type($source->column_info($col)->{data_type});
+  if ($dsn !~ /maxConnect=/) {
+    $self->_dbi_connect_info->[0] = "$dsn;maxConnect=$val";
+    my $connected = defined $self->_dbh;
+    $self->disconnect;
+    $self->ensure_connected if $connected;
   }
-
-  return \%blob_cols;
 }
 
-sub _update_blobs {
-  my ($self, $source, $blob_cols, $inserted) = @_;
-  my $dbh = $self->dbh;
-
-  my $table = $source->from;
-
-  my (@primary_cols) = $source->primary_columns;
-
-  croak "Cannot update TEXT/IMAGE without a primary key!"
-    unless @primary_cols;
+=head2 using_freetds
 
-  my $search_cond = join ',' => map "$_ = ?", @primary_cols;
+Whether or not L<DBD::Sybase> was compiled against FreeTDS. If false, it means
+the Sybase OpenClient libraries were used.
 
-  for my $col (keys %$blob_cols) {
-    my $blob = $blob_cols->{$col};
-
-# First update to empty string in case it's NULL, can't update a NULL blob using
-# the API.
-    my $sth = $dbh->prepare_cached(
-      qq{update $table set $col = '' where $search_cond}
-    );
-    $sth->execute(map $inserted->{$_}, @primary_cols) or die $sth->errstr;
-    $sth->finish;
-
-    $sth = $dbh->prepare_cached(
-      "select $col from $table where $search_cond"
-    );
-    $sth->execute(map $inserted->{$_}, @primary_cols);
-
-    eval {
-      while ($sth->fetch) {
-        $sth->func('CS_GET', 1, 'ct_data_info') or die $sth->errstr;
-      }
-      $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;
+=cut
 
-      $sth->func($blob, length($blob), 'ct_send_data') or die $sth->errstr;
+sub using_freetds {
+  my $self = shift;
 
-      $sth->func('ct_finish_send') or die $sth->errstr;
-    };
-    my $exception = $@;
-    $sth->finish;
-    croak $exception if $exception;
-  }
+  return $self->_get_dbh->{syb_oc_version} =~ /freetds/i;
 }
 
-=head2 connect_call_datetime_setup
-
-Used as:
-
-  on_connect_call => 'datetime_setup'
+=head2 set_textsize
 
-In L<DBIx::Class::Storage::DBI/connect_info> to set:
+When using FreeTDS and/or MSSQL, C<< $dbh->{LongReadLen} >> is not available,
+use this function instead. It does:
 
-  $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
+  $dbh->do("SET TEXTSIZE $bytes");
 
-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.
+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.
 
 =cut
 
-{
-  my $old_dbd_warned = 0;
-
-  sub connect_call_datetime_setup {
-    my $self = shift;
-    my $dbh = $self->_dbh;
-
-    if ($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 set_textsize {
+  my $self = shift;
+  my $text_size = shift ||
+    eval { $self->_dbi_connect_info->[-1]->{LongReadLen} } ||
+    32768; # the DBD::Sybase default
 
-sub _dbh_last_insert_id {
-  my ($self, $dbh, $source, $col) = @_;
+  return unless defined $text_size;
 
-  # sorry, there's no other way!
-  my $sth = $dbh->prepare_cached("select max($col) from ".$source->from);
-  return ($dbh->selectrow_array($sth))[0];
+  $self->_dbh->do("SET TEXTSIZE $text_size");
 }
 
-# previous implementation of limited count for Sybase, does not include
-# count_grouped.
-
-#sub _copy_attributes_for_count {
-#  my ($self, $source, $attrs) = @_;
-#  my %attrs = %$attrs;
-#
-#  # take off any column specs, any pagers, record_filter is cdbi, and no point of ordering a count
-#  delete @attrs{qw/select as rows offset page order_by record_filter/};
-#
-#  return \%attrs;
-#}
-#
-#=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) = @_;
-#
-#  my $new_attrs = $self->_copy_attributes_for_count($source, $attrs);
-#
-#  if (exists $attrs->{rows}) {
-#    my $offset = $attrs->{offset} || 0;
-#    my $total  = $attrs->{rows} + $offset;
-#
-#    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;
-#  } else {
-#    # overwrite the selector
-#    $new_attrs->{select} = { count => '*' };
-#
-#    my $tmp_rs = $source->resultset_class->new($source, $new_attrs);
-#    my ($count) = $tmp_rs->cursor->next;
-#
-#    # if the offset/rows attributes are still present, we did not use
-#    # a subquery, so we need to make the calculations in software
-#    $count -= $attrs->{offset} if $attrs->{offset};
-#    $count = $attrs->{rows} if $attrs->{rows} and $attrs->{rows} < $count;
-#    $count = 0 if ($count < 0);
-#
-#    return $count;
-#  }
-#}
-
 1;
 
-=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
 
 See L<DBIx::Class/CONTRIBUTORS>.
@@ -336,4 +130,3 @@ See L<DBIx::Class/CONTRIBUTORS>.
 You may distribute this code under the same terms as Perl itself.
 
 =cut
-# vim:sts=2 sw=2: