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package Parse::Dia::SQL::Output::DB2;
# $Id: DB2.pm,v 1.5 2009/03/13 14:20:26 aff Exp $
=pod
=head1 NAME
Parse::Dia::SQL::Output::DB2 - Create SQL for DB2.
=head1 SYNOPSIS
use Parse::Dia::SQL;
my $dia = Parse::Dia::SQL->new(...);
print $dia->get_sql();
=head1 DESCRIPTION
This class creates SQL for the IBM DB2 database.
=cut
use warnings;
use strict;
use Data::Dumper;
use File::Spec::Functions qw(catfile);
use lib q{lib};
use base q{Parse::Dia::SQL::Output}; # extends
require Parse::Dia::SQL::Logger;
require Parse::Dia::SQL::Const;
=head2 new
The constructor. Arguments:
=cut
sub new {
my ( $class, %param ) = @_;
my $self = {};
# Set defaults for db2
$param{object_name_max_length} = $param{object_name_max_length} || 18;
$param{index_options} = ['allow reverse scans'] unless
defined($param{index_options}) && scalar(@{$param{index_options}});
$param{db} = q{db2};
$self = $class->SUPER::new(%param);
bless( $self, $class );
return $self;
}
=head2
Create primary key clause, e.g.
constraint pk_<tablename> primary key (<column1>,..,<columnN>)
For DB2 the PK must be 18 characters or less
Returns undefined if list of primary key is empty (i.e. if there are no
primary keys on given table).
=cut
sub _create_pk_string {
my ( $self, $tablename, @pks ) = @_;
if ( !$tablename ) {
$self->{log}
->error(q{Missing argument tablename - cannot create pk string!});
return;
}
if ( scalar(@pks) == 0 ) {
$self->{log}->debug(qq{table '$tablename' has no primary keys});
return;
}
# old school name length reduction
$tablename =
$self->{utils}
->mangle_name( $tablename, $self->{object_name_max_length} - 4 );
# new school name length reduction
# $tablename = $self->{utils}->make_name ($tablename);
$self->{log}->debug( qq{tablename: '$tablename' pks: } . join( q{,}, @pks ) );
return qq{constraint pk_$tablename primary key (} . join( q{,}, @pks ) . q{)};
}
=head2
For DB2 a constraint name must be 18 characters or less.
Returns shortened tablename.
=cut
sub _create_constraint_name {
my ( $self, $constraint_name ) = @_;
if ( !defined($constraint_name) || $constraint_name eq q{} ) {
$self->{log}->error( qq{constraint_name was undefined or empty!});
return;
}
# new school
return $self->{utils}->make_name (0, $constraint_name);
# old school
# return $self->{utils}->mangle_name( $constraint_name, $self->{object_name_max_length} - 4 );
}
=head2 _get_drop_schema_sql
DB2 do not support keyword 'if exists' in 'drop table' statement
=cut
sub _get_drop_schema_sql {
my ($self, $tablename) = @_;
return
qq{drop table $tablename}
. $self->{end_of_statement}
. $self->{newline};
}
1;
__END__
=pod
Subclass for outputting SQL for the DB2 database
=cut
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