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use strict;
############################################
# derive a DateExpr class from existing Expr
package Tangram::Dialect::Sybase::DateExpr;
use base qw( Tangram::Expr );
############################
# add method datepart($part)
sub datepart
{
my ($self, $part) = @_; # $part is 'year', 'month', etc
my $expr = $self->expr(); # the SQL string for this Expr
##################################
# build a new Expr of Integer type
# pass this Expr's remote object list to the new Expr
return Tangram::Integer->expr("DATEPART($part, $expr)", $self->objects);
}
###########################
# subclass Tangram::Dialect
package Tangram::Dialect::Sybase;
use Tangram::Dialect;
use base qw( Tangram::Dialect );
############################################
# a hash that maps date-related Types to the
# DateExpr - the improved Expr class
my %improved =
(
'Tangram::RawDateTime' => 'Tangram::Dialect::Sybase::DateExpr',
'Tangram::RawDate' => 'Tangram::Dialect::Sybase::DateExpr',
);
######################################################
# Tangram calls this method to obtain new Expr objects
sub expr
{
my $self = shift;
my $type = shift;
my ($expr, @remotes) = @_;
###################################################
# is $type related to dates? if not, return default
my $improved = $improved{ref($type)} or return $type->expr(@_);
####################################
# $type is a Date; return a DateExpr
return $improved->new($type, $expr, @remotes);
}
sub rate_connect_string
{
my ($self, $cs) = @_;
return +($cs =~ m/^dbi:Sybase:/i);
}
Tangram::Dialect::Sybase->register();
1;
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