SQL::Statement::Term (3pm)

  # 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 );

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

SQL::Statement::Term

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.

\s-1DESTROY\s0

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

# 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 );

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

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

new

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

value

Returns the specified constant.

# 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 );

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

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

new

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

value

Returns the specified column value.

Copyright (c) 2009,2010 by Jens Rehsack: rehsackATcpan.org

All rights reserved.

You may distribute this module under the terms of either the \s-1GNU\s0 General Public License or the Artistic License, as specified in the Perl \s-1README\s0 file.