sql::statement::termfactory(3) [suse man page]

SQL::Statement::TermFactory(3)				User Contributed Perl Documentation			    SQL::Statement::TermFactory(3)

NAME

       SQL::Statement::TermFactory - Factory for SQL::Statement::Term instances

SYNOPSIS

	 my $termFactory = SQL::Statement::TermFactory->new($stmt);
	 my $whereTerms = $termFactory->buildCondition( $stmt->{where_clause} );
	 my $col = $termFactory->buildCondition( $stmt->{col_obj}->{$name}->{content} );

DESCRIPTION

       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 polymophism instead of conditions is
       suggested by Martin Fowler in his book Refactoring.

METHODS

   buildCondition
       Builds a condition object from a given (part of a) where clause. This method calls itself recursively for predicates.

AUTHOR AND COPYRIGHT

       Copyright (c) 2001,2005 by Jeff Zucker: jzuckerATcpan.org Copyright (c) 2008-2010 by Jens Rehsack: rehsackATcpan.org

       Portions Copyright (C) 1998 by Jochen Wiedmann: jwiedATcpan.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.

perl v5.12.1							    2010-05-06					    SQL::Statement::TermFactory(3)

SQL::Statement::Term(3) 				User Contributed Perl Documentation				   SQL::Statement::Term(3)

NAME

       SQL::Statement::Term - base class for all terms

SYNOPSIS

	 # create a term with an SQL::Statement object as owner
	 my $term = SQL::Statement::Term->new( $owner );
	 # access the value of that term
	 $term->value( $eval );

DESCRIPTION

       SQL::Statement::Term is an abstract base class providing the interface for all terms.

INHERITANCE

	 SQL::Statement::Term

METHODS

   new
       Instantiates new term and stores a weak reference to the owner.

   value
       Abstract method which will return the value of the term. Must be overridden by derived classes.

   DESTROY
       Destroys the term and undefines the weak reference to the owner.

NAME

       SQL::Statement::ConstantTerm - term for constant values

SYNOPSIS

	 # create a term with an SQL::Statement object as owner
	 my $term = SQL::Statement::ConstantTerm->new( $owner, 'foo' );
	 # access the value of that term - returns 'foo'
	 $term->value( $eval );

DESCRIPTION

       SQL::Statement::ConstantTerm implements a term which will always return the same constant value.

INHERITANCE

	 SQL::Statement::ConstantTerm
	 ISA SQL::Statement::Term

METHODS

   new
       Instantiates new term and stores the constant to deliver and a weak reference to the owner.

   value
       Returns the specified constant.

NAME

       SQL::Statement::ColumnValue - term for column values

SYNOPSIS

	 # create a term with an SQL::Statement object as owner
	 my $term = SQL::Statement::ColumnValue->new( $owner, 'id' );
	 # access the value of that term - returns the value of the column 'id'
	 # of the currently active row in $eval
	 $term->value( $eval );

DESCRIPTION

       SQL::Statement::ColumnValue implements a term which will return the specified column of the active row.

INHERITANCE

	 SQL::Statement::ColumnValue
	 ISA SQL::Statement::Term

METHODS

   new
       Instantiates new term and stores the column name to deliver and a weak reference to the owner.

   value
       Returns the specified column value.

AUTHOR AND COPYRIGHT

       Copyright (c) 2009,2010 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.

perl v5.12.1							    2010-05-06						   SQL::Statement::Term(3)