phpman > perldoc > SQL::Statement::Term(3pm)

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.