SQL::Statement::TermFactory − Factory for SQL::Statement::Term instances
my $termFactory
= SQL::Statement::TermFactory−>new($stmt);
my $whereTerms = $termFactory−>buildCondition(
$stmt−>{where_clause} );
my $col = $termFactory−>buildCondition(
$stmt−>{col_obj}−>{$name}−>{content}
);
This package implements a factory to create type and operation based terms. Those terms are used to access data from the table(s) − either when evaluating the where clause or returning column data.
The concept of a factory can be studied in Design Patterns by the Gang of Four. The concept of using polymorphism instead of conditions is suggested by Martin Fowler in his book Refactoring.
Builds a condition object from a given (part of a) where clause. This method calls itself recursively for predicates.
Copyright (c) 2001,2005 by Jeff Zucker: jzuckerATcpan.org Copyright (c) 2009−2020 by Jens Rehsack: rehsackATcpan.org
All rights reserved.
You may distribute this module under the terms of either the GNU General Public License or the Artistic License, as specified in the Perl README file.