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SQL::Statement::Term(3User Contributed Perl DocumentaSQL::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.

perl v5.30.3                      2020-10-23         SQL::Statement::Term(3pm)