X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FDBIx%2FClass%2FStorage%2FDBI%2FODBC%2FMicrosoft_SQL_Server.pm;h=6676bfb5e1828556a2ee8e93862adbf347e337db;hb=66c7d805ba0908304807c3b9767afa1a56355f11;hp=544e68c328224bc73427a34990ab01f92d7e4df9;hpb=88e12210acdb453298f90cab7296e538c44bb593;p=dbsrgits%2FDBIx-Class.git

diff --git a/lib/DBIx/Class/Storage/DBI/ODBC/Microsoft_SQL_Server.pm b/lib/DBIx/Class/Storage/DBI/ODBC/Microsoft_SQL_Server.pm
index 544e68c..6676bfb 100644
--- a/lib/DBIx/Class/Storage/DBI/ODBC/Microsoft_SQL_Server.pm
+++ b/lib/DBIx/Class/Storage/DBI/ODBC/Microsoft_SQL_Server.pm
@@ -3,108 +3,163 @@ use strict;
 use warnings;
 
 use base qw/DBIx::Class::Storage::DBI::MSSQL/;
+use mro 'c3';
 
-sub insert_bulk {
-  my ($self, $source, $cols, $data) = @_;
+use Carp::Clan qw/^DBIx::Class/;
+use List::Util();
+use Scalar::Util ();
 
-  my $identity_insert = 0;
+__PACKAGE__->mk_group_accessors(simple => qw/
+  _using_dynamic_cursors
+/);
 
-  COLUMNS:
-  foreach my $col (@{$cols}) {
-    if ($source->column_info($col)->{is_auto_increment}) {
-      $identity_insert = 1;
-      last COLUMNS;
-    }
-  }
+=head1 NAME
+
+DBIx::Class::Storage::DBI::ODBC::Microsoft_SQL_Server - Support specific
+to Microsoft SQL Server over ODBC
+
+=head1 DESCRIPTION
+
+This class implements support specific to Microsoft SQL Server over ODBC.  It is
+loaded automatically by by DBIx::Class::Storage::DBI::ODBC when it detects a
+MSSQL back-end.
+
+Most of the functionality is provided from the superclass
+L<DBIx::Class::Storage::DBI::MSSQL>.
+
+=head1 MULTIPLE ACTIVE STATEMENTS
+
+The following options are alternative ways to enable concurrent executing
+statement support. Each has its own advantages and drawbacks.
+
+=head2 connect_call_use_dynamic_cursors
 
-  my $table = $source->from;
-  if ($identity_insert) {
-    $source->storage->dbh_do(sub {
-	my ($storage, $dbh, @cols) = @_;
-	$dbh->do("SET IDENTITY_INSERT $table ON;");
-      });
+Use as:
+
+  on_connect_call => 'use_dynamic_cursors'
+
+in your L<DBIx::Class::Storage::DBI/connect_info> as one way to enable multiple
+concurrent statements.
+
+Will add C<< odbc_cursortype => 2 >> to your DBI connection attributes. See
+L<DBD::ODBC/odbc_cursortype> for more information.
+
+Alternatively, you can add it yourself and dynamic cursor will be automatically
+enabled.
+
+This will not work with CODE ref connect_info's and will do nothing if you set
+C<odbc_cursortype> yourself.
+
+B<WARNING:> this will break C<SCOPE_IDENTITY()>, and C<SELECT @@IDENTITY> will
+be used instead, which on SQL Server 2005 and later will return erroneous
+results on tables which have an on insert trigger that inserts into another
+table with an C<IDENTITY> column.
+
+=cut
+
+sub connect_call_use_dynamic_cursors {
+  my $self = shift;
+
+  if (ref($self->_dbi_connect_info->[0]) eq 'CODE') {
+    croak 'cannot set DBI attributes on a CODE ref connect_info';
   }
 
-  next::method(@_);
+  my $dbi_attrs = $self->_dbi_connect_info->[-1];
 
-  if ($identity_insert) {
-    $source->storage->dbh_do(sub {
-	my ($storage, $dbh, @cols) = @_;
-	$dbh->do("SET IDENTITY_INSERT $table OFF;");
-      });
+  unless (ref($dbi_attrs) && Scalar::Util::reftype($dbi_attrs) eq 'HASH') {
+    $dbi_attrs = {};
+    push @{ $self->_dbi_connect_info }, $dbi_attrs;
   }
 
+  if (not exists $dbi_attrs->{odbc_cursortype}) {
+    # turn on support for multiple concurrent statements, unless overridden
+    $dbi_attrs->{odbc_cursortype} = 2;
+    my $connected = defined $self->_dbh;
+    $self->disconnect;
+    $self->ensure_connected if $connected;
+    $self->_set_dynamic_cursors;
+  }
 }
 
-sub _prep_for_execute {
+sub _set_dynamic_cursors {
   my $self = shift;
-  my ($op, $extra_bind, $ident, $args) = @_;
-
-  my ($sql, $bind) = $self->next::method (@_);
-  $sql .= ';SELECT SCOPE_IDENTITY()' if $op eq 'insert';
+  $self->_using_dynamic_cursors(1);
+  $self->_identity_method('@@identity');
+}
 
-  my %identity_insert_tables;
-  my $col_info = $self->_resolve_column_info($ident, [map $_->[0], @{$bind}]);
+sub _rebless {
+  no warnings 'uninitialized';
+  my $self = shift;
 
-  foreach my $bound (@{$bind}) {
-    my $col = $bound->[0];
-    if ($col_info->{$col}->{is_auto_increment}) {
-      my $table = $col_info->{$col}->{-result_source}->from;
-      $identity_insert_tables{$table} = 1;
-    }
+  if (ref($self->_dbi_connect_info->[0]) ne 'CODE' &&
+      eval { $self->_dbi_connect_info->[-1]{odbc_cursortype} } == 2) {
+    $self->_set_dynamic_cursors;
+    return;
   }
 
-  my $identity_insert_on = join '', map { "SET IDENTITY_INSERT $_ ON; " } keys %identity_insert_tables;
-  my $identity_insert_off = join '', map { "SET IDENTITY_INSERT $_ OFF; " } keys %identity_insert_tables;
-  $sql = "$identity_insert_on $sql $identity_insert_off";
-
-  return ($sql, $bind);
+  $self->_using_dynamic_cursors(0);
 }
 
-sub _execute {
-    my $self = shift;
-    my ($op) = @_;
+=head2 connect_call_use_server_cursors
+
+Use as:
+
+  on_connect_call => 'use_server_cursors'
 
-    my ($rv, $sth, @bind) = $self->dbh_do($self->can('_dbh_execute'), @_);
-    if ($op eq 'insert') {
-      $self->{_scope_identity} = $sth->fetchrow_array;
-      $sth->finish;
-    }
+May allow multiple active select statements. See
+L<DBD::ODBC/odbc_SQL_ROWSET_SIZE> for more information.
 
-    return wantarray ? ($rv, $sth, @bind) : $rv;
+Takes an optional parameter for the value to set the attribute to, default is
+C<2>.
+
+B<WARNING>: this does not work on all versions of SQL Server, and may lock up
+your database!
+
+=cut
+
+sub connect_call_use_server_cursors {
+  my $self            = shift;
+  my $sql_rowset_size = shift || 2;
+
+  $self->_dbh->{odbc_SQL_ROWSET_SIZE} = $sql_rowset_size;
 }
 
-sub last_insert_id { shift->{_scope_identity} }
+=head2 connect_call_use_mars
 
-1;
+Use as:
 
-__END__
+  on_connect_call => 'use_mars'
 
-=head1 NAME
+Use to enable a feature of SQL Server 2005 and later, "Multiple Active Result
+Sets". See L<DBD::ODBC::FAQ/Does DBD::ODBC support Multiple Active Statements?>
+for more information.
 
-DBIx::Class::Storage::DBI::ODBC::Microsoft_SQL_Server - Support specific
-to Microsoft SQL Server over ODBC
+B<WARNING>: This has implications for the way transactions are handled.
 
-=head1 DESCRIPTION
+=cut
 
-This class implements support specific to Microsoft SQL Server over ODBC,
-including auto-increment primary keys and SQL::Abstract::Limit dialect.  It
-is loaded automatically by by DBIx::Class::Storage::DBI::ODBC when it
-detects a MSSQL back-end.
+sub connect_call_use_mars {
+  my $self = shift;
 
-=head1 IMPLEMENTATION NOTES
+  my $dsn = $self->_dbi_connect_info->[0];
 
-Microsoft SQL Server supports three methods of retrieving the IDENTITY
-value for inserted row: IDENT_CURRENT, @@IDENTITY, and SCOPE_IDENTITY().
-SCOPE_IDENTITY is used here because it is the safest.  However, it must
-be called is the same execute statement, not just the same connection.
+  if (ref($dsn) eq 'CODE') {
+    croak 'cannot change the DBI DSN on a CODE ref connect_info';
+  }
 
-So, this implementation appends a SELECT SCOPE_IDENTITY() statement
-onto each INSERT to accommodate that requirement.
+  if ($dsn !~ /MARS_Connection=/) {
+    $self->_dbi_connect_info->[0] = "$dsn;MARS_Connection=Yes";
+    my $connected = defined $self->_dbh;
+    $self->disconnect;
+    $self->ensure_connected if $connected;
+  }
+}
+
+1;
 
-=head1 AUTHORS
+=head1 AUTHOR
 
-Marc Mims C<< <marc@questright.com> >>
+See L<DBIx::Class/CONTRIBUTORS>.
 
 =head1 LICENSE