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) 2009-2020 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.
perl v5.30.3 2020-10-21 SQL::Statement::Term(3)
sql-statement 1.101.0 - Generated Sat Oct 24 15:32:56 CDT 2020