NAME

DBIx::Class::Storage::DBI::Oracle::Generic - Oracle Support for DBIx::Class

SYNOPSIS

  # In your result (table) classes
  use base 'DBIx::Class::Core';
  __PACKAGE__->add_columns({ id => { sequence => 'mysequence', auto_nextval => 1 } });
  __PACKAGE__->set_primary_key('id');

  # Somewhere in your Code
  # add some data to a table with a hierarchical relationship
  $schema->resultset('Person')->create ({
        firstname => 'foo',
        lastname => 'bar',
        children => [
            {
                firstname => 'child1',
                lastname => 'bar',
                children => [
                    {
                        firstname => 'grandchild',
                        lastname => 'bar',
                    }
                ],
            },
            {
                firstname => 'child2',
                lastname => 'bar',
            },
        ],
    });

  # select from the hierarchical relationship
  my $rs = $schema->resultset('Person')->search({},
    {
      'start_with' => { 'firstname' => 'foo', 'lastname' => 'bar' },
      'connect_by' => { 'parentid' => { '-prior' => { -ident => 'personid' } },
      'order_siblings_by' => { -asc => 'name' },
    };
  );

  # this will select the whole tree starting from person "foo bar", creating
  # following query:
  # SELECT
  #     me.persionid me.firstname, me.lastname, me.parentid
  # FROM
  #     person me
  # START WITH
  #     firstname = 'foo' and lastname = 'bar'
  # CONNECT BY
  #     parentid = prior personid
  # ORDER SIBLINGS BY
  #     firstname ASC

DESCRIPTION

This class implements base Oracle support. The subclass DBIx::Class::Storage::DBI::Oracle::WhereJoins is for "(+)" joins in Oracle versions before 9.0.

METHODS

get_autoinc_seq

Returns the sequence name for an autoincrement column

datetime_parser_type

This sets the proper DateTime::Format module for use with DBIx::Class::InflateColumn::DateTime.

connect_call_datetime_setup

Used as:

    on_connect_call => 'datetime_setup'

In connect_info to set the session nls date, and timestamp values for use with DBIx::Class::InflateColumn::DateTime and the necessary environment variables for DateTime::Format::Oracle, which is used by it.

Maximum allowable precision is used, unless the environment variables have already been set.

These are the defaults used:

  $ENV{NLS_DATE_FORMAT}         ||= 'YYYY-MM-DD HH24:MI:SS';
  $ENV{NLS_TIMESTAMP_FORMAT}    ||= 'YYYY-MM-DD HH24:MI:SS.FF';
  $ENV{NLS_TIMESTAMP_TZ_FORMAT} ||= 'YYYY-MM-DD HH24:MI:SS.FF TZHTZM';

To get more than second precision with DBIx::Class::InflateColumn::DateTime for your timestamps, use something like this:

  use Time::HiRes 'time';
  my $ts = DateTime->from_epoch(epoch => time);

relname_to_table_alias

DBIx::Class uses DBIx::Class::Relationship names as table aliases in queries.

Unfortunately, Oracle doesn't support identifiers over 30 chars in length, so the DBIx::Class::Relationship name is shortened and appended with half of an MD5 hash.

See "relname_to_table_alias" in DBIx::Class::Storage::DBI.

with_deferred_fk_checks

Runs a coderef between:

  alter session set constraints = deferred
  ...
  alter session set constraints = immediate

to defer foreign key checks.

Constraints must be declared "DEFERRABLE" for this to work.

ATTRIBUTES

Following additional attributes can be used in resultsets.

connect_by or connect_by_nocycle

Value: \%connect_by

A hashref of conditions used to specify the relationship between parent rows and child rows of the hierarchy.

  connect_by => { parentid => 'prior personid' }

  # adds a connect by statement to the query:
  # SELECT
  #     me.persionid me.firstname, me.lastname, me.parentid
  # FROM
  #     person me
  # CONNECT BY
  #     parentid = prior persionid


  connect_by_nocycle => { parentid => 'prior personid' }

  # adds a connect by statement to the query:
  # SELECT
  #     me.persionid me.firstname, me.lastname, me.parentid
  # FROM
  #     person me
  # CONNECT BY NOCYCLE
  #     parentid = prior persionid

start_with

Value: \%condition

A hashref of conditions which specify the root row(s) of the hierarchy.

It uses the same syntax as "search" in DBIx::Class::ResultSet

  start_with => { firstname => 'Foo', lastname => 'Bar' }

  # SELECT
  #     me.persionid me.firstname, me.lastname, me.parentid
  # FROM
  #     person me
  # START WITH
  #     firstname = 'foo' and lastname = 'bar'
  # CONNECT BY
  #     parentid = prior persionid

order_siblings_by

Value: ($order_siblings_by | \@order_siblings_by)

Which column(s) to order the siblings by.

It uses the same syntax as "order_by" in DBIx::Class::ResultSet

  'order_siblings_by' => 'firstname ASC'

  # SELECT
  #     me.persionid me.firstname, me.lastname, me.parentid
  # FROM
  #     person me
  # CONNECT BY
  #     parentid = prior persionid
  # ORDER SIBLINGS BY
  #     firstname ASC

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.