use base qw/DBIx::Class::Storage::DBI::MSSQL/;
use mro 'c3';
-
+use Scalar::Util 'reftype';
+use Try::Tiny;
use Carp::Clan qw/^DBIx::Class/;
-use List::Util();
-use Scalar::Util ();
+use namespace::clean;
__PACKAGE__->mk_group_accessors(simple => qw/
_using_dynamic_cursors
=head1 MULTIPLE ACTIVE STATEMENTS
The following options are alternative ways to enable concurrent executing
-statement support. Each has its own advantages and drawbacks.
+statement support. Each has its own advantages and drawbacks and works on
+different platforms. Read each section carefully.
+
+In order of preference, they are:
+
+=over 8
+
+=item * L</connect_call_use_mars>
+
+=item * L</connect_call_use_dynamic_cursors>
+
+=item * L</connect_call_use_server_cursors>
+
+=back
+
+=head1 METHODS
+
+=head2 connect_call_use_mars
+
+Use as:
+
+ on_connect_call => 'use_mars'
+
+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.
+
+This does not work on FreeTDS drivers at the time of this writing, and only
+works with the Native Client, later versions of the Windows MS ODBC driver, and
+the Easysoft driver.
+
+=cut
+
+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=/) {
+ if ($self->using_freetds) {
+ $self->throw_exception('FreeTDS does not support MARS at the time of '
+ .'writing.');
+ }
+
+ if (exists $self->_server_info->{normalized_dbms_version} &&
+ $self->_server_info->{normalized_dbms_version} < 9) {
+ $self->throw_exception('SQL Server 2005 or later required to use MARS.');
+ }
+
+ if (my ($data_source) = $dsn =~ /^dbi:ODBC:([\w-]+)\z/i) { # prefix with DSN
+ warn "Bare DSN in ODBC connect string, rewriting to DSN=$data_source\n";
+ $dsn = "dbi:ODBC:DSN=$data_source";
+ }
+
+ $self->_dbi_connect_info->[0] = "$dsn;MARS_Connection=Yes";
+ $self->disconnect;
+ $self->ensure_connected;
+ }
+}
+
+sub connect_call_use_MARS {
+ carp "'connect_call_use_MARS' has been deprecated, use "
+ ."'connect_call_use_mars' instead.";
+ shift->connect_call_use_mars(@_)
+}
=head2 connect_call_use_dynamic_cursors
on_connect_call => 'use_dynamic_cursors'
-in your L<DBIx::Class::Storage::DBI/connect_info> as one way to enable multiple
+in your L<connect_info|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
my $self = shift;
if (ref($self->_dbi_connect_info->[0]) eq 'CODE') {
- croak 'cannot set DBI attributes on a CODE ref connect_info';
+ $self->throw_exception ('Cannot set DBI attributes on a CODE ref connect_info');
}
my $dbi_attrs = $self->_dbi_connect_info->[-1];
- unless (ref($dbi_attrs) && Scalar::Util::reftype($dbi_attrs) eq 'HASH') {
+ unless (ref $dbi_attrs eq 'HASH') {
$dbi_attrs = {};
push @{ $self->_dbi_connect_info }, $dbi_attrs;
}
my $self = shift;
my $dbh = $self->_get_dbh;
- eval {
+ try {
local $dbh->{RaiseError} = 1;
local $dbh->{PrintError} = 0;
$dbh->do('SELECT @@IDENTITY');
- };
- if ($@) {
- croak <<'EOF';
+ } catch {
+ $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(1);
$self->_identity_method('@@identity');
}
-sub _rebless {
- no warnings 'uninitialized';
+sub _init {
my $self = shift;
- if (ref($self->_dbi_connect_info->[0]) ne 'CODE' &&
- eval { $self->_dbi_connect_info->[-1]{odbc_cursortype} } == 2) {
+ if (
+ ref($self->_dbi_connect_info->[0]) ne 'CODE'
+ &&
+ ref ($self->_dbi_connect_info->[-1]) eq 'HASH'
+ &&
+ ($self->_dbi_connect_info->[-1]{odbc_cursortype} || 0) > 1
+ ) {
$self->_set_dynamic_cursors;
- return;
}
-
- $self->_using_dynamic_cursors(0);
+ else {
+ $self->_using_dynamic_cursors(0);
+ }
}
=head2 connect_call_use_server_cursors
B<WARNING>: this does not work on all versions of SQL Server, and may lock up
your database!
+At the time of writing, this option only works on Microsoft's Windows drivers,
+later versions of the ODBC driver and the Native Client driver.
+
=cut
sub connect_call_use_server_cursors {
my $self = shift;
my $sql_rowset_size = shift || 2;
+ if ($^O !~ /win32|cygwin/i) {
+ $self->throw_exception('Server cursors only work on Windows platforms at '
+ .'the time of writing.');
+ }
+
$self->_get_dbh->{odbc_SQL_ROWSET_SIZE} = $sql_rowset_size;
}
-=head2 connect_call_use_MARS
+=head2 using_freetds
-Use as:
-
- on_connect_call => 'use_MARS'
-
-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.
-
-B<WARNING>: This has implications for the way transactions are handled.
+Tries to determine, to the best of our ability, whether or not you are using the
+FreeTDS driver with L<DBD::ODBC>.
=cut
-sub connect_call_use_MARS {
+sub using_freetds {
my $self = shift;
my $dsn = $self->_dbi_connect_info->[0];
- if (ref($dsn) eq 'CODE') {
- croak 'cannot change the DBI DSN on a CODE ref connect_info';
- }
+ $dsn = '' if ref $dsn eq 'CODE';
- if ($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;
- }
+ my $dbh = $self->_get_dbh;
+
+ return 1 if $dsn =~ /driver=FreeTDS/i
+ || (try { $dbh->get_info(6) }||'') =~ /tdsodbc/i;
+
+ return 0;
}
1;