X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FDBIx%2FClass%2FStorage%2FDBI%2FSybase.pm;h=b320242f077d7cdf74d6655c52a1d10b7e293806;hb=f6de71113251acc964444e57bf3d38a23dc09ffd;hp=f8b5004b99817e436d443b3a3909c8b069ffa89c;hpb=3abafb11007307452da109622919fb9af0979d26;p=dbsrgits%2FDBIx-Class.git

diff --git a/lib/DBIx/Class/Storage/DBI/Sybase.pm b/lib/DBIx/Class/Storage/DBI/Sybase.pm
index f8b5004..b320242 100644
--- a/lib/DBIx/Class/Storage/DBI/Sybase.pm
+++ b/lib/DBIx/Class/Storage/DBI/Sybase.pm
@@ -3,10 +3,50 @@ package DBIx::Class::Storage::DBI::Sybase;
 use strict;
 use warnings;
 
-use Class::C3;
-use base qw/DBIx::Class::Storage::DBI/;
-
+use base qw/
+    DBIx::Class::Storage::DBI::Sybase::Base
+    DBIx::Class::Storage::DBI
+/;
+use mro 'c3';
 use Carp::Clan qw/^DBIx::Class/;
+use List::Util ();
+
+__PACKAGE__->mk_group_accessors('simple' =>
+    qw/_identity _blob_log_on_update/
+);
+
+=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)>.
+
+But your queries will be cached.
+
+You need a version of L<DBD::Sybase> compiled with the Sybase OpenClient
+libraries, B<NOT> FreeTDS, for placeholder support. Otherwise your storage will
+be automatically reblessed into C<::NoBindVars>.
+
+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 $self = shift;
@@ -23,26 +63,338 @@ sub _rebless {
     if (!$exception && $dbtype && $self->load_optional_class($subclass)) {
       bless $self, $subclass;
       $self->_rebless;
-    } else {
-      # real Sybase
+    } else { # real Sybase
+      my $no_bind_vars = 'DBIx::Class::Storage::DBI::Sybase::NoBindVars';
+
+      if ($self->_using_freetds) {
+        carp <<'EOF';
+
+Your version of Sybase potentially supports placeholders and query caching,
+however you seem to be using FreeTDS which does not (yet?) support this.
+
+Please recompile DBD::Sybase with the Sybase OpenClient libraries if you want
+these features.
+
+TEXT/IMAGE column support will also not work under FreeTDS.
+
+See perldoc DBIx::Class::Storage::DBI::Sybase for more details.
+EOF
+        $self->ensure_class_loaded($no_bind_vars);
+        bless $self, $no_bind_vars;
+        $self->_rebless;
+      }
+
       if (not $self->dbh->{syb_dynamic_supported}) {
-        bless $self, 'DBIx::Class::Storage:DBI::Sybase::NoBindVars';
+        $self->ensure_class_loaded($no_bind_vars);
+        bless $self, $no_bind_vars;
         $self->_rebless;
       }
-      $self->connect_call_datetime_setup;
+ 
+      $self->_set_maxConnect;
     }
   }
 }
 
+# Make sure we have CHAINED mode turned on, we don't know how DBD::Sybase was
+# compiled.
 sub _populate_dbh {
   my $self = shift;
   $self->next::method(@_);
-  $self->connect_call_datetime_setup;
-  1;
+  $self->_dbh->{syb_chained_txn} = 1;
 }
 
-{
-  my $old_dbd_warned = 0;
+sub _using_freetds {
+  my $self = shift;
+
+  return $self->_dbh->{syb_oc_version} =~ /freetds/i;
+}
+
+sub _set_maxConnect {
+  my $self = shift;
+
+  my $dsn = $self->_dbi_connect_info->[0];
+
+  return if ref($dsn) eq 'CODE';
+
+  if ($dsn !~ /maxConnect=/) {
+    $self->_dbi_connect_info->[0] = "$dsn;maxConnect=256";
+    my $connected = defined $self->_dbh;
+    $self->disconnect;
+    $self->ensure_connected if $connected;
+  }
+}
+
+=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 && $type =~ /(?:text|image|lob|bytea|binary|memo)/i;
+}
+
+## This will be useful if we ever implement BLOB filehandle inflation and will
+## need to use the API, but for now it isn't.
+#
+#sub order_columns_for_select {
+#  my ($self, $source, $columns) = @_;
+#
+#  my (@non_blobs, @blobs);
+#
+#  for my $col (@$columns) {
+#    if ($self->_is_lob_type($source->column_info($col)->{data_type})) {
+#      push @blobs, $col;
+#    } else {
+#      push @non_blobs, $col;
+#    }
+#  }
+#
+#  croak "cannot select more than a one TEXT/IMAGE column at a time"
+#    if @blobs > 1;
+#
+#  return (@non_blobs, @blobs);
+#}
+
+# the select-piggybacking-on-insert trick stolen from odbc/mssql
+sub _prep_for_execute {
+  my $self = shift;
+  my ($op, $extra_bind, $ident, $args) = @_;
+
+  my ($sql, $bind) = $self->next::method (@_);
+
+  if ($op eq 'insert') {
+    my $table = $ident->from;
+
+    my $bind_info = $self->_resolve_column_info($ident, [map $_->[0], @{$bind}]);
+    my $identity_col =
+List::Util::first { $bind_info->{$_}{is_auto_increment} } (keys %$bind_info);
+
+    if ($identity_col) {
+      $sql =
+"SET IDENTITY_INSERT $table ON\n" .
+"$sql\n" .
+"SET IDENTITY_INSERT $table OFF"
+    } else {
+      $identity_col = List::Util::first {
+        $ident->column_info($_)->{is_auto_increment}
+      } $ident->columns;
+    }
+
+    if ($identity_col) {
+      $sql =
+        "$sql\n" .
+        $self->_fetch_identity_sql($ident, $identity_col) . "\n";
+    }
+  }
+
+  return ($sql, $bind);
+}
+
+sub _fetch_identity_sql {
+  my ($self, $source, $col) = @_;
+
+  return "SELECT MAX($col) FROM ".$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) : $rv;
+}
+
+sub last_insert_id { shift->_identity }
+
+# override to handle TEXT/IMAGE and nested txn
+sub insert {
+  my ($self, $source, $to_insert) = splice @_, 0, 3;
+  my $dbh = $self->_dbh;
+
+  my $blob_cols = $self->_remove_blob_cols($source, $to_insert);
+
+# Sybase has nested transactions fortunately, because we have to do the insert
+# in a transaction to avoid race conditions with the SELECT MAX(COL) identity
+# method used when placeholders are enabled.
+  my $updated_cols = do {
+    local $self->{auto_savepoint} = 1;
+    my $args = \@_;
+    my $method = $self->next::can;
+    $self->txn_do(
+      sub { $self->$method($source, $to_insert, @$args) }
+    );
+  };
+
+  $self->_insert_blobs($source, $blob_cols, $to_insert) if %$blob_cols;
+
+  return $updated_cols;
+}
+
+sub update {
+  my ($self, $source)  = splice @_, 0, 2;
+  my ($fields, $where) = @_;
+  my $wantarray        = wantarray;
+
+  my $blob_cols = $self->_remove_blob_cols($source, $fields);
+
+  my @res;
+  if ($wantarray) {
+    @res    = $self->next::method($source, @_);
+  } else {
+    $res[0] = $self->next::method($source, @_);
+  }
+
+  $self->_update_blobs($source, $blob_cols, $where) if %$blob_cols;
+
+  return $wantarray ? @res : $res[0];
+}
+
+sub _remove_blob_cols {
+  my ($self, $source, $fields) = @_;
+
+  my %blob_cols;
+
+  for my $col (keys %$fields) {
+    if ($self->_is_lob_type($source->column_info($col)->{data_type})) {
+      $blob_cols{$col} = delete $fields->{$col};
+      $fields->{$col} = \"''";
+    }
+  }
+
+  return \%blob_cols;
+}
+
+sub _update_blobs {
+  my ($self, $source, $blob_cols, $where) = @_;
+
+  my (@primary_cols) = $source->primary_columns;
+
+  croak "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 $rs = $source->resultset->search(
+      $where,
+      {
+        result_class => 'DBIx::Class::ResultClass::HashRefInflator',
+        select => \@primary_cols
+      }
+    );
+    @rows = $rs->all; # statement must finish
+  }
+
+  for my $row (@rows) {
+    $self->_insert_blobs($source, $blob_cols, $row);
+  }
+}
+
+sub _insert_blobs {
+  my ($self, $source, $blob_cols, $row) = @_;
+  my $dbh = $self->dbh;
+
+  my $table = $source->from;
+
+  my %row = %$row;
+  my (@primary_cols) = $source->primary_columns;
+
+  croak "Cannot update TEXT/IMAGE column(s) without a primary key"
+    unless @primary_cols;
+
+  if ((grep { defined $row{$_} } @primary_cols) != @primary_cols) {
+    if (@primary_cols == 1) {
+      my $col = $primary_cols[0];
+      $row{$col} = $self->last_insert_id($source, $col);
+    } else {
+      croak "Cannot update TEXT/IMAGE column(s) without primary key values";
+    }
+  }
+
+  for my $col (keys %$blob_cols) {
+    my $blob = $blob_cols->{$col};
+    my $sth;
+
+    if (not $self->isa('DBIx::Class::Storage::DBI::NoBindVars')) {
+      my $search_cond = join ',' => map "$_ = ?", @primary_cols;
+
+      $sth = $self->sth(
+        "select $col from $table where $search_cond"
+      );
+      $sth->execute(map $row{$_}, @primary_cols);
+    } else {
+      my $search_cond = join ',' => map "$_ = $row{$_}", @primary_cols;
+
+      $sth = $dbh->prepare(
+        "select $col from $table where $search_cond"
+      );
+      $sth->execute;
+    }
+
+    eval {
+      while ($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;
+
+      $sth->func($blob, length($blob), 'ct_send_data') or die $sth->errstr;
+
+      $sth->func('ct_finish_send') or die $sth->errstr;
+    };
+    my $exception = $@;
+    $sth->finish;
+    croak $exception if $exception;
+  }
+}
 
 =head2 connect_call_datetime_setup
 
@@ -63,6 +415,9 @@ 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;
@@ -81,73 +436,54 @@ C<SMALLDATETIME> columns only have minute precision.
   }
 }
 
-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];
-}
-
-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];
+sub datetime_parser_type { "DateTime::Format::Sybase" }
 
-  $new_attrs->{select} = $first_pk ? "me.$first_pk" : 1;
+# savepoint support using ASE syntax
 
-  my $tmp_rs = $source->resultset_class->new($source, $new_attrs);
+sub _svp_begin {
+  my ($self, $name) = @_;
 
-  $self->dbh->{syb_rowcount} = $total;
+  $self->dbh->do("SAVE TRANSACTION $name");
+}
 
-  my $count = 0;
-  $count++ while $tmp_rs->cursor->next;
+# A new SAVE TRANSACTION with the same name releases the previous one.
+sub _svp_release { 1 }
 
-  $self->dbh->{syb_rowcount} = 0;
+sub _svp_rollback {
+  my ($self, $name) = @_;
 
-  return $count - $offset;
+  $self->dbh->do("ROLLBACK TRANSACTION $name");
 }
 
-sub datetime_parser_type { "DateTime::Format::Sybase" }
-
 1;
 
-=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>.
-
-=head1 DESCRIPTION
+=head1 MAXIMUM CONNECTIONS
 
-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.
+L<DBD::Sybase> 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.
 
-With this driver there is unfortunately no way to get the C<last_insert_id>
-without doing a C<select max(col)>.
+This is a bit too low, so on connection the clientside setting is set to C<256>
+(see L<DBD::Sybase/maxConnect>.) You can override it to whatever setting you
+like in the DSN.
 
-But your queries will be cached.
+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 IMAGE AND TEXT COLUMNS
+
+L<DBD::Sybase> compiled with FreeTDS will B<NOT> work with C<TEXT/IMAGE>
+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.
+
 =head1 AUTHORS
 
 See L<DBIx::Class/CONTRIBUTORS>.