/usr/share/perl5/DBIx/Class/Storage/DBI/ODBC/Microsoft_SQL_Server.pm is in libdbix-class-perl 0.08196-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 | package DBIx::Class::Storage::DBI::ODBC::Microsoft_SQL_Server;
use strict;
use warnings;
use base qw/DBIx::Class::Storage::DBI::MSSQL/;
use mro 'c3';
use Scalar::Util 'reftype';
use Try::Tiny;
use DBIx::Class::Carp;
use namespace::clean;
__PACKAGE__->mk_group_accessors(simple => qw/
_using_dynamic_cursors
/);
=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 USAGE NOTES
=head2 Basic Linux Setup (Debian)
sudo aptitude install tdsodbc libdbd-odbc-perl unixodbc
In case it is not already there put the following in C</etc/odbcinst.ini>:
[FreeTDS]
Description = FreeTDS
Driver = /usr/lib/odbc/libtdsodbc.so
Setup = /usr/lib/odbc/libtdsS.so
UsageCount = 1
Set your C<$dsn> in L<connect_info|DBIx::Class::Storage::DBI/connect_info> as follows:
dbi:ODBC:server=<my.host.name>;port=1433;driver=FreeTDS;tds_version=8.0
If you use the EasySoft driver (L<http://www.easysoft.com>):
dbi:ODBC:server=<my.host.name>;port=1433;driver=Easysoft ODBC-SQL Server
=head2 Basic Windows Setup
Use the following C<$dsn> for the Microsoft ODBC driver:
dbi:ODBC:driver={SQL Server};server=SERVER\SQL_SERVER_INSTANCE_NAME
And for the Native Client:
dbi:ODBC:driver={SQL Server Native Client 10.0};server=SERVER\SQL_SERVER_INSTANCE_NAME
Go into Control Panel -> System and Security -> Administrative Tools -> Data
Sources (ODBC) to check driver names and to set up data sources.
Use System DSNs, not User DSNs if you want to use DSNs.
If you set up a DSN, use the following C<$dsn> for
L<connect_info|DBIx::Class::Storage::DBI/connect_info>:
dbi:ODBC:dsn=MY_DSN
=head1 MULTIPLE ACTIVE STATEMENTS
The following options are alternative ways to enable concurrent executing
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<mars|/connect_call_use_mars>
=item * L<dynamic_cursors|/connect_call_use_dynamic_cursors>
=item * L<server_cursors|/connect_call_use_server_cursors>
=back
=head1 METHODS
=head2 connect_call_use_mars
Use as:
on_connect_call => 'use_mars'
in your connection info, or alternatively specify it directly:
Your::Schema->connect (
$original_dsn . '; MARS_Connection=Yes',
$user,
$pass,
\%attrs,
)
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) = $dsn =~ /^dbi:ODBC:([\w-]+)\z/i) { # prefix with DSN
warn "Bare DSN in ODBC connect string, rewriting as 'dsn=$data_source'"
." for MARS\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
Use as:
on_connect_call => 'use_dynamic_cursors'
Which will add C<< odbc_cursortype => 2 >> to your DBI connection
attributes, or alternatively specify the necessary flag directly:
Your::Schema->connect (@dsn, { ... odbc_cursortype => 2 })
See L<DBD::ODBC/odbc_cursortype> for more information.
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:> on FreeTDS (and maybe some other drivers) 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.
B<WARNING:> on FreeTDS, changes made in one statement (e.g. an insert) may not
be visible from a following statement (e.g. a select.)
=cut
sub connect_call_use_dynamic_cursors {
my $self = shift;
if (($self->_dbic_connect_attributes->{odbc_cursortype} || 0) < 2) {
my $dbi_inf = $self->_dbi_connect_info;
$self->throw_exception ('Cannot set DBI attributes on a CODE ref connect_info')
if ref($dbi_inf->[0]) eq 'CODE';
# reenter connection information with the attribute re-set
$dbi_inf->[3] = {} if @$dbi_inf <= 3;
$dbi_inf->[3]{odbc_cursortype} = 2;
$self->_dbi_connect_info($dbi_inf);
$self->disconnect; # resetting dbi attrs, so have to reconnect
$self->ensure_connected;
}
}
sub _run_connection_actions {
my $self = shift;
# keep the dynamic_cursors_support and driver-state in sync
# on every reconnect
my $use_dyncursors = ($self->_dbic_connect_attributes->{odbc_cursortype} || 0) > 1;
if (
$use_dyncursors
xor
!!$self->_using_dynamic_cursors
) {
if ($use_dyncursors) {
try {
my $dbh = $self->_dbh;
local $dbh->{RaiseError} = 1;
local $dbh->{PrintError} = 0;
$dbh->do('SELECT @@IDENTITY');
} catch {
$self->throw_exception (
'Your drivers do not seem to support dynamic cursors (odbc_cursortype => 2).'
. (
$self->using_freetds
? ' If you are using FreeTDS, make sure to set tds_version to 8.0 or greater.'
: ''
)
);
};
$self->_using_dynamic_cursors(1);
$self->_identity_method('@@identity');
}
else {
$self->_using_dynamic_cursors(0);
$self->_identity_method(undef);
}
}
$self->next::method (@_);
}
=head2 connect_call_use_server_cursors
Use as:
on_connect_call => 'use_server_cursors'
May allow multiple active select statements. See
L<DBD::ODBC/odbc_SQL_ROWSET_SIZE> for more information.
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!
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 using_freetds
Tries to determine, to the best of our ability, whether or not you are using the
FreeTDS driver with L<DBD::ODBC>.
=cut
sub using_freetds {
my $self = shift;
my $dsn = $self->_dbi_connect_info->[0];
$dsn = '' if ref $dsn eq 'CODE';
return 1 if $dsn =~ /driver=FreeTDS/i
|| ($self->_dbh_get_info(6)||'') =~ /tdsodbc/i;
return 0;
}
1;
=head1 AUTHOR
See L<DBIx::Class/AUTHOR> and L<DBIx::Class/CONTRIBUTORS>.
=head1 LICENSE
You may distribute this code under the same terms as Perl itself.
=cut
# vim:sw=2 sts=2 et
|