X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FDBIx%2FClass%2FStorage%2FDBI%2FMSSQL.pm;h=d528b2209c49298ea00650a4ee6cdaa87df003ac;hb=c84189e13c678016a72cf3163730b7705b97a959;hp=40afe76607663593f11e85840f1be120fcba1c46;hpb=eb0323dfeabac3aa2d50e56e9f9a1c958ba9c534;p=dbsrgits%2FDBIx-Class.git

diff --git a/lib/DBIx/Class/Storage/DBI/MSSQL.pm b/lib/DBIx/Class/Storage/DBI/MSSQL.pm
index 40afe76..d528b22 100644
--- a/lib/DBIx/Class/Storage/DBI/MSSQL.pm
+++ b/lib/DBIx/Class/Storage/DBI/MSSQL.pm
@@ -3,12 +3,167 @@ package DBIx::Class::Storage::DBI::MSSQL;
 use strict;
 use warnings;
 
-use base qw/DBIx::Class::Storage::DBI/;
+use base qw/DBIx::Class::Storage::DBI::AmbiguousGlob DBIx::Class::Storage::DBI/;
+use mro 'c3';
 
-sub _dbh_last_insert_id {
-  my ($self, $dbh, $source, $col) = @_;
-  my ($id) = $dbh->selectrow_array('SELECT SCOPE_IDENTITY()');
-  return $id;
+use List::Util();
+
+__PACKAGE__->mk_group_accessors(simple => qw/
+  _identity _identity_method
+/);
+
+__PACKAGE__->sql_maker_class('DBIx::Class::SQLAHacks::MSSQL');
+
+sub _set_identity_insert {
+  my ($self, $table) = @_;
+
+  my $sql = sprintf (
+    'SET IDENTITY_INSERT %s ON',
+    $self->sql_maker->_quote ($table),
+  );
+
+  my $dbh = $self->_get_dbh;
+  eval { $dbh->do ($sql) };
+  if ($@) {
+    $self->throw_exception (sprintf "Error executing '%s': %s",
+      $sql,
+      $dbh->errstr,
+    );
+  }
+}
+
+sub insert_bulk {
+  my $self = shift;
+  my ($source, $cols, $data) = @_;
+
+  if (List::Util::first
+      { $source->column_info ($_)->{is_auto_increment} }
+      (@{$cols})
+  ) {
+      $self->_set_identity_insert ($source->name);
+  }
+
+  $self->next::method(@_);
+}
+
+# support MSSQL GUID column types
+
+sub insert {
+  my $self = shift;
+  my ($source, $to_insert) = @_;
+
+  my $supplied_col_info = $self->_resolve_column_info($source, [keys %$to_insert] );
+
+  my %guid_cols;
+  my @pk_cols = $source->primary_columns;
+  my %pk_cols;
+  @pk_cols{@pk_cols} = ();
+
+  my @pk_guids = grep {
+    $source->column_info($_)->{data_type}
+    &&
+    $source->column_info($_)->{data_type} =~ /^uniqueidentifier/i
+  } @pk_cols;
+
+  my @auto_guids = grep {
+    $source->column_info($_)->{data_type}
+    &&
+    $source->column_info($_)->{data_type} =~ /^uniqueidentifier/i
+    &&
+    $source->column_info($_)->{auto_nextval}
+  } grep { not exists $pk_cols{$_} } $source->columns;
+
+  my @get_guids_for =
+    grep { not exists $to_insert->{$_} } (@pk_guids, @auto_guids);
+
+  my $updated_cols = {};
+
+  for my $guid_col (@get_guids_for) {
+    my ($new_guid) = $self->_get_dbh->selectrow_array('SELECT NEWID()');
+    $updated_cols->{$guid_col} = $to_insert->{$guid_col} = $new_guid;
+  }
+
+  if (List::Util::first { $_->{is_auto_increment} } (values %$supplied_col_info) ) {
+    $self->_set_identity_insert ($source->name);
+  }
+
+  $updated_cols = { %$updated_cols, %{ $self->next::method(@_) } };
+
+  return $updated_cols;
+}
+
+sub _prep_for_execute {
+  my $self = shift;
+  my ($op, $extra_bind, $ident, $args) = @_;
+
+# cast MONEY values properly
+  if ($op eq 'insert' || $op eq 'update') {
+    my $fields = $args->[0];
+
+    for my $col (keys %$fields) {
+      # $ident is a result source object with INSERT/UPDATE ops
+      if ($ident->column_info ($col)->{data_type}
+         &&
+         $ident->column_info ($col)->{data_type} =~ /^money\z/i) {
+        my $val = $fields->{$col};
+        $fields->{$col} = \['CAST(? AS MONEY)', [ $col => $val ]];
+      }
+    }
+  }
+
+  my ($sql, $bind) = $self->next::method (@_);
+
+  if ($op eq 'insert') {
+    $sql .= ';SELECT SCOPE_IDENTITY()';
+
+  }
+
+  return ($sql, $bind);
+}
+
+sub _execute {
+  my $self = shift;
+  my ($op) = @_;
+
+  my ($rv, $sth, @bind) = $self->dbh_do($self->can('_dbh_execute'), @_);
+
+  if ($op eq 'insert') {
+
+    # this should bring back the result of SELECT SCOPE_IDENTITY() we tacked
+    # on in _prep_for_execute above
+    my ($identity) = $sth->fetchrow_array;
+
+    # SCOPE_IDENTITY failed, but we can do something else
+    if ( (! $identity) && $self->_identity_method) {
+      ($identity) = $self->_dbh->selectrow_array(
+        'select ' . $self->_identity_method
+      );
+    }
+
+    $self->_identity($identity);
+    $sth->finish;
+  }
+
+  return wantarray ? ($rv, $sth, @bind) : $rv;
+}
+
+sub last_insert_id { shift->_identity }
+
+# savepoint syntax is the same as in Sybase ASE
+
+sub _svp_begin {
+  my ($self, $name) = @_;
+
+  $self->_get_dbh->do("SAVE TRANSACTION $name");
+}
+
+# A new SAVE TRANSACTION with the same name releases the previous one.
+sub _svp_release { 1 }
+
+sub _svp_rollback {
+  my ($self, $name) = @_;
+
+  $self->_get_dbh->do("ROLLBACK TRANSACTION $name");
 }
 
 sub build_datetime_parser {
@@ -22,49 +177,63 @@ sub build_datetime_parser {
 sub sqlt_type { 'SQLServer' }
 
 sub _sql_maker_opts {
-    my ( $self, $opts ) = @_;
+  my ( $self, $opts ) = @_;
 
-    if ( $opts ) {
-        $self->{_sql_maker_opts} = { %$opts };
-    }
+  if ( $opts ) {
+    $self->{_sql_maker_opts} = { %$opts };
+  }
 
-    return { limit_dialect => 'Top', %{$self->{_sql_maker_opts}||{}} };
+  return { limit_dialect => 'Top', %{$self->{_sql_maker_opts}||{}} };
 }
 
 1;
 
 =head1 NAME
 
-DBIx::Class::Storage::DBI::MSSQL - Storage::DBI subclass for MSSQL
+DBIx::Class::Storage::DBI::MSSQL - Base Class for Microsoft SQL Server support
+in DBIx::Class
 
 =head1 SYNOPSIS
 
-This subclass supports MSSQL, and can in theory be used directly
-via the C<storage_type> mechanism:
+This is the base class for Microsoft SQL Server support, used by
+L<DBIx::Class::Storage::DBI::ODBC::Microsoft_SQL_Server> and
+L<DBIx::Class::Storage::DBI::Sybase::Microsoft_SQL_Server>.
+
+=head1 IMPLEMENTATION NOTES
+
+=head2 IDENTITY information
+
+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.
 
-  $schema->storage_type('::DBI::MSSQL');
-  $schema->connect_info('dbi:....', ...);
+So, this implementation appends a SELECT SCOPE_IDENTITY() statement
+onto each INSERT to accommodate that requirement.
 
-However, as there is no L<DBD::MSSQL>, you will probably want to use
-one of the other DBD-specific MSSQL classes, such as
-L<DBIx::Class::Storage::DBI::Sybase::MSSQL>.  These classes will
-merge this class with a DBD-specific class to obtain fully
-correct behavior for your scenario.
+C<SELECT @@IDENTITY> can also be used by issuing:
 
-=head1 METHODS
+  $self->_identity_method('@@identity');
 
-=head2 last_insert_id
+it will only be used if SCOPE_IDENTITY() fails.
 
-=head2 sqlt_type
+This is more dangerous, as inserting into a table with an on insert trigger that
+inserts into another table with an identity will give erroneous results on
+recent versions of SQL Server.
 
-=head2 build_datetime_parser
+=head2 identity insert
 
-The resulting parser handles the MSSQL C<DATETIME> type, but is almost
-certainly not sufficient for the other MSSQL 2008 date/time types.
+Be aware that we have tried to make things as simple as possible for our users.
+For MSSQL that means that when a user tries to create a row, while supplying an
+explicit value for an autoincrementing column, we will try to issue the
+appropriate database call to make this possible, namely C<SET IDENTITY_INSERT
+$table_name ON>. Unfortunately this operation in MSSQL requires the
+C<db_ddladmin> privilege, which is normally not included in the standard
+write-permissions.
 
-=head1 AUTHORS
+=head1 AUTHOR
 
-Brian Cassidy <bricas@cpan.org>
+See L<DBIx::Class/CONTRIBUTORS>.
 
 =head1 LICENSE