Protect DBIC as best we can from the failure mode in 7cb35852

[dbsrgits/DBIx-Class.git] / lib / DBIx / Class / Storage / DBI / InterBase.pm

package DBIx::Class::Storage::DBI::InterBase;

use strict;
use warnings;
use base qw/DBIx::Class::Storage::DBI::Firebird::Common/;
use mro 'c3';
use DBIx::Class::_Util 'dbic_internal_try';
use namespace::clean;

=head1 NAME

DBIx::Class::Storage::DBI::InterBase - Driver for the Firebird RDBMS via
L<DBD::InterBase>

=head1 DESCRIPTION

This driver is a subclass of L<DBIx::Class::Storage::DBI::Firebird::Common> for
use with L<DBD::InterBase>, see that driver for general details.

You need to use either the
L<disable_sth_caching|DBIx::Class::Storage::DBI/disable_sth_caching> option or
L</connect_call_use_softcommit> (see L</CAVEATS>) for your code to function
correctly with this driver. Otherwise you will likely get bizarre error messages
such as C<no statement executing>. The alternative is to use the
L<ODBC|DBIx::Class::Storage::DBI::ODBC::Firebird> driver, which is more suitable
for long running processes such as under L<Catalyst>.

To turn on L<DBIx::Class::InflateColumn::DateTime> support, see
L</connect_call_datetime_setup>.

=cut

sub _ping {
  my $self = shift;

  my $dbh = $self->_dbh or return 0;

  local $dbh->{RaiseError} = 1;
  local $dbh->{PrintError} = 0;

  (dbic_internal_try {
    $dbh->do('select 1 from rdb$database');
    1;
  })
    ? 1
    : 0
  ;
}

# We want dialect 3 for new features and quoting to work, DBD::InterBase uses
# dialect 1 (interbase compat) by default.
sub _init {
  my $self = shift;
  $self->_set_sql_dialect(3);
}

sub _set_sql_dialect {
  my $self = shift;
  my $val  = shift || 3;

  my $dsn = $self->_dbi_connect_info->[0];

  return if ref($dsn) eq 'CODE';

  if ($dsn !~ /ib_dialect=/) {
    $self->_dbi_connect_info->[0] = "$dsn;ib_dialect=$val";
    my $connected = defined $self->_dbh;
    $self->disconnect;
    $self->ensure_connected if $connected;
  }
}

=head2 connect_call_use_softcommit

Used as:

  on_connect_call => 'use_softcommit'

In L<connect_info|DBIx::Class::Storage::DBI/connect_info> to set the
L<DBD::InterBase> C<ib_softcommit> option.

You need either this option or C<< disable_sth_caching => 1 >> for
L<DBIx::Class> code to function correctly (otherwise you may get C<no statement
executing> errors.) Or use the L<ODBC|DBIx::Class::Storage::DBI::ODBC::Firebird>
driver.

The downside of using this option is that your process will B<NOT> see UPDATEs,
INSERTs and DELETEs from other processes for already open statements.

=cut

sub connect_call_use_softcommit {
  my $self = shift;

  $self->_dbh->{ib_softcommit} = 1;
}

=head2 connect_call_datetime_setup

Used as:

  on_connect_call => 'datetime_setup'

In L<connect_info|DBIx::Class::Storage::DBI/connect_info> to set the date and
timestamp formats using:

  $dbh->{ib_time_all} = 'ISO';

See L<DBD::InterBase> for more details.

The C<TIMESTAMP> data type supports up to 4 digits after the decimal point for
second precision. The full precision is used.

The C<DATE> data type stores the date portion only, and it B<MUST> be declared
with:

  data_type => 'date'

in your Result class.

Timestamp columns can be declared with either C<datetime> or C<timestamp>.

You will need the L<DateTime::Format::Strptime> module for inflation to work.

For L<DBIx::Class::Storage::DBI::ODBC::Firebird>, this is a noop.

=cut

sub connect_call_datetime_setup {
  my $self = shift;

  $self->_get_dbh->{ib_time_all} = 'ISO';
}

=head1 CAVEATS

=over 4

=item *

with L</connect_call_use_softcommit>, you will not be able to see changes made
to data in other processes. If this is an issue, use
L<disable_sth_caching|DBIx::Class::Storage::DBI/disable_sth_caching> as a
workaround for the C<no statement executing> errors, this of course adversely
affects performance.

Alternately, use the L<ODBC|DBIx::Class::Storage::DBI::ODBC::Firebird> driver.

=back

=head1 FURTHER QUESTIONS?

Check the list of L<additional DBIC resources|DBIx::Class/GETTING HELP/SUPPORT>.

=head1 COPYRIGHT AND LICENSE

This module is free software L<copyright|DBIx::Class/COPYRIGHT AND LICENSE>
by the L<DBIx::Class (DBIC) authors|DBIx::Class/AUTHORS>. You can
redistribute it and/or modify it under the same terms as the
L<DBIx::Class library|DBIx::Class/COPYRIGHT AND LICENSE>.

=cut

1;

# vim:sts=2 sw=2: