1 package DBIx::Class::Storage::DBI::ODBC::Microsoft_SQL_Server;
5 use base qw/DBIx::Class::Storage::DBI::MSSQL/;
7 use Scalar::Util 'reftype';
9 use Carp::Clan qw/^DBIx::Class/;
12 __PACKAGE__->mk_group_accessors(simple => qw/
13 _using_dynamic_cursors
18 DBIx::Class::Storage::DBI::ODBC::Microsoft_SQL_Server - Support specific
19 to Microsoft SQL Server over ODBC
23 This class implements support specific to Microsoft SQL Server over ODBC. It is
24 loaded automatically by by DBIx::Class::Storage::DBI::ODBC when it detects a
27 Most of the functionality is provided from the superclass
28 L<DBIx::Class::Storage::DBI::MSSQL>.
32 =head2 Basic Linux Setup (Debian)
34 sudo aptitude install tdsodbc libdbd-odbc-perl unixodbc
36 In case it is not already there put the following in C</etc/odbcinst.ini>:
40 Driver = /usr/lib/odbc/libtdsodbc.so
41 Setup = /usr/lib/odbc/libtdsS.so
44 Set your C<$dsn> in L<connect_info|DBIx::Class::Storage::DBI/connect_info> as follows:
46 dbi:ODBC:server=<my.host.name>;port=1433;driver=FreeTDS;tds_version=8.0
48 If you use the EasySoft driver (L<http://www.easysoft.com>):
50 dbi:ODBC:server=<my.host.name>;port=1433;driver=Easysoft ODBC-SQL Server
52 =head2 Basic Windows Setup
54 Use the following C<$dsn> for the Microsoft ODBC driver:
56 dbi:ODBC:driver={SQL Server};server=SERVER\SQL_SERVER_INSTANCE_NAME
58 And for the Native Client:
60 dbi:ODBC:driver={SQL Server Native Client 10.0};server=SERVER\SQL_SERVER_INSTANCE_NAME
62 Go into Control Panel -> System and Security -> Administrative Tools -> Data
63 Sources (ODBC) to check driver names and to set up data sources.
65 Use System DSNs, not User DSNs if you want to use DSNs.
67 If you set up a DSN, use the following C<$dsn> for
68 L<connect_info|DBIx::Class::Storage::DBI/connect_info>:
72 =head1 MULTIPLE ACTIVE STATEMENTS
74 The following options are alternative ways to enable concurrent executing
75 statement support. Each has its own advantages and drawbacks and works on
76 different platforms. Read each section carefully.
78 In order of preference, they are:
82 =item * L</connect_call_use_mars>
84 =item * L</connect_call_use_dynamic_cursors>
86 =item * L</connect_call_use_server_cursors>
92 =head2 connect_call_use_mars
96 on_connect_call => 'use_mars'
98 Use to enable a feature of SQL Server 2005 and later, "Multiple Active Result
99 Sets". See L<DBD::ODBC::FAQ/Does DBD::ODBC support Multiple Active Statements?>
100 for more information.
102 This does not work on FreeTDS drivers at the time of this writing, and only
103 works with the Native Client, later versions of the Windows MS ODBC driver, and
108 sub connect_call_use_mars {
111 my $dsn = $self->_dbi_connect_info->[0];
113 if (ref($dsn) eq 'CODE') {
114 $self->throw_exception('cannot change the DBI DSN on a CODE ref connect_info');
117 if ($dsn !~ /MARS_Connection=/) {
118 if ($self->using_freetds) {
119 $self->throw_exception('FreeTDS does not support MARS at the time of '
123 if (exists $self->_server_info->{normalized_dbms_version} &&
124 $self->_server_info->{normalized_dbms_version} < 9) {
125 $self->throw_exception('SQL Server 2005 or later required to use MARS.');
128 if (my ($data_source) = $dsn =~ /^dbi:ODBC:([\w-]+)\z/i) { # prefix with DSN
129 warn "Bare DSN in ODBC connect string, rewriting to DSN=$data_source\n";
130 $dsn = "dbi:ODBC:DSN=$data_source";
133 $self->_dbi_connect_info->[0] = "$dsn;MARS_Connection=Yes";
135 $self->ensure_connected;
139 sub connect_call_use_MARS {
140 carp "'connect_call_use_MARS' has been deprecated, use "
141 ."'connect_call_use_mars' instead.";
142 shift->connect_call_use_mars(@_)
145 =head2 connect_call_use_dynamic_cursors
149 on_connect_call => 'use_dynamic_cursors'
151 in your L<connect_info|DBIx::Class::Storage::DBI/connect_info> as one way to enable multiple
152 concurrent statements.
154 Will add C<< odbc_cursortype => 2 >> to your DBI connection attributes. See
155 L<DBD::ODBC/odbc_cursortype> for more information.
157 Alternatively, you can add it yourself and dynamic cursor support will be
158 automatically enabled.
160 If you're using FreeTDS, C<tds_version> must be set to at least C<8.0>.
162 This will not work with CODE ref connect_info's.
164 B<WARNING:> this will break C<SCOPE_IDENTITY()>, and C<SELECT @@IDENTITY> will
165 be used instead, which on SQL Server 2005 and later will return erroneous
166 results on tables which have an on insert trigger that inserts into another
167 table with an C<IDENTITY> column.
171 sub connect_call_use_dynamic_cursors {
174 if (ref($self->_dbi_connect_info->[0]) eq 'CODE') {
175 $self->throw_exception ('Cannot set DBI attributes on a CODE ref connect_info');
178 my $dbi_attrs = $self->_dbi_connect_info->[-1];
180 unless (ref $dbi_attrs eq 'HASH') {
182 push @{ $self->_dbi_connect_info }, $dbi_attrs;
185 if (not exists $dbi_attrs->{odbc_cursortype}) {
186 # turn on support for multiple concurrent statements, unless overridden
187 $dbi_attrs->{odbc_cursortype} = 2;
188 $self->disconnect; # resetting dbi attrs, so have to reconnect
189 $self->ensure_connected;
190 $self->_set_dynamic_cursors;
194 sub _set_dynamic_cursors {
196 my $dbh = $self->_get_dbh;
199 local $dbh->{RaiseError} = 1;
200 local $dbh->{PrintError} = 0;
201 $dbh->do('SELECT @@IDENTITY');
203 $self->throw_exception (<<'EOF');
205 Your drivers do not seem to support dynamic cursors (odbc_cursortype => 2),
206 if you're using FreeTDS, make sure to set tds_version to 8.0 or greater.
210 $self->_using_dynamic_cursors(1);
211 $self->_identity_method('@@identity');
218 ref($self->_dbi_connect_info->[0]) ne 'CODE'
220 ref ($self->_dbi_connect_info->[-1]) eq 'HASH'
222 ($self->_dbi_connect_info->[-1]{odbc_cursortype} || 0) > 1
224 $self->_set_dynamic_cursors;
227 $self->_using_dynamic_cursors(0);
231 =head2 connect_call_use_server_cursors
235 on_connect_call => 'use_server_cursors'
237 May allow multiple active select statements. See
238 L<DBD::ODBC/odbc_SQL_ROWSET_SIZE> for more information.
240 Takes an optional parameter for the value to set the attribute to, default is
243 B<WARNING>: this does not work on all versions of SQL Server, and may lock up
246 At the time of writing, this option only works on Microsoft's Windows drivers,
247 later versions of the ODBC driver and the Native Client driver.
251 sub connect_call_use_server_cursors {
253 my $sql_rowset_size = shift || 2;
255 if ($^O !~ /win32|cygwin/i) {
256 $self->throw_exception('Server cursors only work on Windows platforms at '
257 .'the time of writing.');
260 $self->_get_dbh->{odbc_SQL_ROWSET_SIZE} = $sql_rowset_size;
265 Tries to determine, to the best of our ability, whether or not you are using the
266 FreeTDS driver with L<DBD::ODBC>.
273 my $dsn = $self->_dbi_connect_info->[0];
275 $dsn = '' if ref $dsn eq 'CODE';
277 my $dbh = $self->_get_dbh;
279 return 1 if $dsn =~ /driver=FreeTDS/i
280 || (try { $dbh->get_info(6) }||'') =~ /tdsodbc/i;
289 See L<DBIx::Class/CONTRIBUTORS>.
293 You may distribute this code under the same terms as Perl itself.