use base qw/DBIx::Class::Storage::DBI::MSSQL/;
use mro 'c3';
-use Carp::Clan qw/^DBIx::Class/;
+
use List::Util();
+use Scalar::Util ();
__PACKAGE__->mk_group_accessors(simple => qw/
- _scope_identity _using_dynamic_cursors
+ _using_dynamic_cursors
/);
=head1 NAME
=head1 DESCRIPTION
-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.
-
-=head1 IMPLEMENTATION NOTES
-
-Microsoft SQL Server supports three methods of retrieving the C<IDENTITY>
-value for inserted row: C<IDENT_CURRENT>, C<@@IDENTITY>, and C<SCOPE_IDENTITY()>.
-C<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.
+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.
-So, this implementation appends a C<SELECT SCOPE_IDENTITY()> statement
-onto each C<INSERT> to accommodate that requirement.
-
-If you use dynamic cursors with C<< odbc_cursortype => 2 >> or
-L</on_connect_call_use_dynamic_cursors> then the less accurate
-C<SELECT @@IDENTITY> is used instead.
+Most of the functionality is provided from the superclass
+L<DBIx::Class::Storage::DBI::MSSQL>.
=head1 MULTIPLE ACTIVE STATEMENTS
Will add C<< odbc_cursortype => 2 >> to your DBI connection attributes. See
L<DBD::ODBC/odbc_cursortype> for more information.
-This will not work with CODE ref connect_info's and will do nothing if you set
-C<odbc_cursortype> yourself.
+Alternatively, you can add it yourself and dynamic cursor support will be
+automatically enabled.
+
+If you're using FreeTDS, C<tds_version> must be set to at least C<8.0>.
+
+This will not work with CODE ref connect_info's.
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
my $self = shift;
if (ref($self->_dbi_connect_info->[0]) eq 'CODE') {
- croak 'cannot set DBI attributes on CODE ref connect_infos';
+ $self->throw_exception ('cannot set DBI attributes on a CODE ref connect_info');
}
my $dbi_attrs = $self->_dbi_connect_info->[-1];
- $dbi_attrs ||= {};
+
+ unless (ref($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
- $self->_dbi_connect_info->[-1] = { %$dbi_attrs, odbc_cursortype => 2 };
- # will take effect next connection
- $self->disconnect;
- $self->_using_dynamic_cursors(1);
+ $dbi_attrs->{odbc_cursortype} = 2;
+ $self->disconnect; # resetting dbi attrs, so have to reconnect
+ $self->ensure_connected;
+ $self->_set_dynamic_cursors;
}
}
-sub _rebless {
- no warnings 'uninitialized';
+sub _set_dynamic_cursors {
my $self = shift;
-
- if (ref($self->_dbi_connect_info->[0]) ne 'CODE' &&
- $self->_dbi_connect_info->[-1]{odbc_cursortype} == 2) {
- $self->_using_dynamic_cursors(1);
- return;
+ my $dbh = $self->_get_dbh;
+
+ eval {
+ local $dbh->{RaiseError} = 1;
+ local $dbh->{PrintError} = 0;
+ $dbh->do('SELECT @@IDENTITY');
+ };
+ if ($@) {
+ $self->throw_exception (<<'EOF');
+
+Your drivers do not seem to support dynamic cursors (odbc_cursortype => 2),
+if you're using FreeTDS, make sure to set tds_version to 8.0 or greater.
+EOF
}
- $self->_using_dynamic_cursors(0);
+ $self->_using_dynamic_cursors(1);
+ $self->_identity_method('@@identity');
}
-sub insert_bulk {
+sub _init {
my $self = shift;
- my ($source, $cols, $data) = @_;
- my $identity_insert = 0;
+ no warnings qw/uninitialized/;
- COLUMNS:
- foreach my $col (@{$cols}) {
- if ($source->column_info($col)->{is_auto_increment}) {
- $identity_insert = 1;
- last COLUMNS;
- }
+ if (
+ ref($self->_dbi_connect_info->[0]) ne 'CODE'
+ &&
+ ref ($self->_dbi_connect_info->[-1]) eq 'HASH'
+ &&
+ $self->_dbi_connect_info->[-1]{odbc_cursortype} == 2
+ ) {
+ $self->_set_dynamic_cursors;
+ return;
}
- if ($identity_insert) {
- my $table = $source->from;
- $self->_get_dbh->do("SET IDENTITY_INSERT $table ON");
- }
+ $self->_using_dynamic_cursors(0);
+}
- $self->next::method(@_);
+=head2 connect_call_use_server_cursors
- if ($identity_insert) {
- my $table = $source->from;
- $self->_get_dbh->do("SET IDENTITY_INSERT $table OFF");
- }
-}
+Use as:
-sub _prep_for_execute {
- my $self = shift;
- my ($op, $extra_bind, $ident, $args) = @_;
+ on_connect_call => 'use_server_cursors'
- my ($sql, $bind) = $self->next::method (@_);
+May allow multiple active select statements. See
+L<DBD::ODBC/odbc_SQL_ROWSET_SIZE> for more information.
- if ($op eq 'insert') {
- $sql .= ';SELECT SCOPE_IDENTITY()';
+Takes an optional parameter for the value to set the attribute to, default is
+C<2>.
- my $col_info = $self->_resolve_column_info($ident, [map $_->[0], @{$bind}]);
- if (List::Util::first { $_->{is_auto_increment} } (values %$col_info) ) {
+B<WARNING>: this does not work on all versions of SQL Server, and may lock up
+your database!
- my $table = $ident->from;
- my $identity_insert_on = "SET IDENTITY_INSERT $table ON";
- my $identity_insert_off = "SET IDENTITY_INSERT $table OFF";
- $sql = "$identity_insert_on; $sql; $identity_insert_off";
- }
- }
+=cut
+
+sub connect_call_use_server_cursors {
+ my $self = shift;
+ my $sql_rowset_size = shift || 2;
- return ($sql, $bind);
+ $self->_get_dbh->{odbc_SQL_ROWSET_SIZE} = $sql_rowset_size;
}
-sub _execute {
- my $self = shift;
- my ($op) = @_;
+=head2 connect_call_use_MARS
- my ($rv, $sth, @bind) = $self->dbh_do($self->can('_dbh_execute'), @_);
- if ($op eq 'insert') {
- my ($identity) = $sth->fetchrow_array;
- $sth->finish;
+Use as:
- if ((not defined $identity) && $self->_using_dynamic_cursors) {
- ($identity) = $self->_dbh->selectrow_array('select @@identity');
- }
+ on_connect_call => 'use_MARS'
- $self->_scope_identity($identity);
- }
+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.
- return wantarray ? ($rv, $sth, @bind) : $rv;
-}
+B<WARNING>: This has implications for the way transactions are handled.
+
+=cut
-sub last_insert_id { shift->_scope_identity() }
+sub connect_call_use_MARS {
+ my $self = shift;
+
+ my $dsn = $self->_dbi_connect_info->[0];
+
+ if (ref($dsn) eq 'CODE') {
+ $self->throw_exception('cannot change the DBI DSN on a CODE ref connect_info');
+ }
+
+ if ($dsn !~ /MARS_Connection=/) {
+ $self->_dbi_connect_info->[0] = "$dsn;MARS_Connection=Yes";
+ my $was_connected = defined $self->_dbh;
+ $self->disconnect;
+ $self->ensure_connected if $was_connected;
+ }
+}
1;
You may distribute this code under the same terms as Perl itself.
=cut
-
# vim: sw=2 sts=2
projects / dbsrgits/DBIx-Class.git / blobdiff