# phpman > info > SQL::Statement::Term

[SQL::Statement::Term](https://www.chedong.com/phpMan.php/perldoc/SQL%3A%3AStatement%3A%3ATerm/markdown)(3User Contributed Perl [DocumentaSQL::Statement](https://www.chedong.com/phpMan.php/perldoc/DocumentaSQL%3A%3AStatement/markdown)::[Term(3pm)](https://www.chedong.com/phpMan.php/man/Term/3pm/markdown)

NAME
       [SQL::Statement::Term](https://www.chedong.com/phpMan.php/perldoc/SQL%3A%3AStatement%3A%3ATerm/markdown) - base class for all terms

SYNOPSIS
         # create a term with an [SQL::Statement](https://www.chedong.com/phpMan.php/perldoc/SQL%3A%3AStatement/markdown) object as owner
         my $term = [SQL::Statement::Term](https://www.chedong.com/phpMan.php/perldoc/SQL%3A%3AStatement%3A%3ATerm/markdown)->new( $owner );
         # access the value of that term
         $term->value( $eval );

DESCRIPTION
       [SQL::Statement::Term](https://www.chedong.com/phpMan.php/perldoc/SQL%3A%3AStatement%3A%3ATerm/markdown) is an abstract base class providing the interface
       for all terms.

INHERITANCE
         [SQL::Statement::Term](https://www.chedong.com/phpMan.php/perldoc/SQL%3A%3AStatement%3A%3ATerm/markdown)

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](https://www.chedong.com/phpMan.php/perldoc/SQL%3A%3AStatement%3A%3AConstantTerm/markdown) - term for constant values

SYNOPSIS
         # create a term with an [SQL::Statement](https://www.chedong.com/phpMan.php/perldoc/SQL%3A%3AStatement/markdown) object as owner
         my $term = [SQL::Statement::ConstantTerm](https://www.chedong.com/phpMan.php/perldoc/SQL%3A%3AStatement%3A%3AConstantTerm/markdown)->new( $owner, 'foo' );
         # access the value of that term - returns 'foo'
         $term->value( $eval );

DESCRIPTION
       [SQL::Statement::ConstantTerm](https://www.chedong.com/phpMan.php/perldoc/SQL%3A%3AStatement%3A%3AConstantTerm/markdown) implements a term which will always return
       the same constant value.

INHERITANCE
         [SQL::Statement::ConstantTerm](https://www.chedong.com/phpMan.php/perldoc/SQL%3A%3AStatement%3A%3AConstantTerm/markdown)
         ISA [SQL::Statement::Term](https://www.chedong.com/phpMan.php/perldoc/SQL%3A%3AStatement%3A%3ATerm/markdown)

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](https://www.chedong.com/phpMan.php/perldoc/SQL%3A%3AStatement%3A%3AColumnValue/markdown) - term for column values

SYNOPSIS
         # create a term with an [SQL::Statement](https://www.chedong.com/phpMan.php/perldoc/SQL%3A%3AStatement/markdown) object as owner
         my $term = [SQL::Statement::ColumnValue](https://www.chedong.com/phpMan.php/perldoc/SQL%3A%3AStatement%3A%3AColumnValue/markdown)->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](https://www.chedong.com/phpMan.php/perldoc/SQL%3A%3AStatement%3A%3AColumnValue/markdown) implements a term which will return the
       specified column of the active row.

INHERITANCE
         [SQL::Statement::ColumnValue](https://www.chedong.com/phpMan.php/perldoc/SQL%3A%3AStatement%3A%3AColumnValue/markdown)
         ISA [SQL::Statement::Term](https://www.chedong.com/phpMan.php/perldoc/SQL%3A%3AStatement%3A%3ATerm/markdown)

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](https://www.chedong.com/phpMan.php/perldoc/SQL%3A%3AStatement/markdown)::[Term(3pm)](https://www.chedong.com/phpMan.php/man/Term/3pm/markdown)