NAME

       DBIx::Class::Storage::DBI::ODBC::Microsoft_SQL_Server - Support specific to Microsoft SQL
       Server over ODBC

DESCRIPTION

       This class implements support specific to Microsoft SQL Server over ODBC.  It is loaded
       automatically by DBIx::Class::Storage::DBI::ODBC when it detects a MSSQL back-end.

       Most of the functionality is provided from the superclass
       DBIx::Class::Storage::DBI::MSSQL.

USAGE NOTES

   Basic Linux Setup (Debian)
         sudo aptitude install tdsodbc libdbd-odbc-perl unixodbc

       In case it is not already there put the following (adjust for non-64bit arch) in
       "/etc/odbcinst.ini":

         [FreeTDS]
         Description = FreeTDS
         Driver      = /usr/lib/x86_64-linux-gnu/odbc/libtdsodbc.so
         Setup       = /usr/lib/x86_64-linux-gnu/odbc/libtdsS.so
         UsageCount  = 1

       Set your $dsn in connect_info as follows:

         dbi:ODBC:server=<my.host.name>;port=1433;driver=FreeTDS;tds_version=8.0

       If you use the EasySoft driver (<http://www.easysoft.com>):

         dbi:ODBC:server=<my.host.name>;port=1433;driver=Easysoft ODBC-SQL Server

   Basic Windows Setup
       Use the following $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 $dsn for connect_info:

         dbi:ODBC:dsn=MY_DSN

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.

       For more details about using MAS in MSSQL over DBD::ODBC see this excellent document
       provided by EasySoft:
       <http://www.easysoft.com/developer/languages/perl/multiple-active-statements.html>.

       In order of preference, they are:

       •       mars

       •       dynamic_cursors

       •       server_cursors

METHODS

   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
       "Does DBD::ODBC support Multiple Active Statements?" in DBD::ODBC::FAQ 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.

   connect_call_use_dynamic_cursors
       Use as:

         on_connect_call => 'use_dynamic_cursors'

       Which will add "odbc_cursortype => 2" to your DBI connection attributes, or alternatively
       specify the necessary flag directly:

         Your::Schema->connect (@dsn, { ... odbc_cursortype => 2 })

       See "odbc_cursortype" in DBD::ODBC for more information.

       If you're using FreeTDS, "tds_version" must be set to at least 8.0.

       This will not work with CODE ref connect_info's.

       WARNING: on FreeTDS (and maybe some other drivers) this will break "SCOPE_IDENTITY()", and
       "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 "IDENTITY" column.

       WARNING: on FreeTDS, changes made in one statement (e.g. an insert) may not be visible
       from a following statement (e.g. a select.)

       WARNING: FreeTDS versions > 0.82 seem to have completely broken the ODBC protocol. DBIC
       will not allow dynamic cursor support with such versions to protect your data. Please
       hassle the authors of FreeTDS to act on the bugs that make their driver not overly usable
       with DBD::ODBC.

   connect_call_use_server_cursors
       Use as:

         on_connect_call => 'use_server_cursors'

       May allow multiple active select statements. See "odbc_SQL_ROWSET_SIZE" in DBD::ODBC for
       more information.

       Takes an optional parameter for the value to set the attribute to, default is 2.

       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.

FURTHER QUESTIONS?

       Check the list of additional DBIC resources.

COPYRIGHT AND LICENSE

       This module is free software copyright by the DBIx::Class (DBIC) authors. You can
       redistribute it and/or modify it under the same terms as the DBIx::Class library.

perl v5.24.1                           DBIx::Class::Storage::DBI::ODBC::Microsoft_SQL_Server(3pm)