---
name: "SQL::Statement::Term"
section: "3pm"
platform: "linux"
package: "libsql-statement-perl"
version: "1.414-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/SQL::Statement::Term"
---

# SQL::Statement::Term(3pm)

base class for all terms

## 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.