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.\" ========================================================================
.\"
.IX Title "SQL::Statement::Term 3"
.TH SQL::Statement::Term 3 "2020-10-21" "perl v5.36.1" "User Contributed Perl Documentation"
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.SH "NAME"
SQL::Statement::Term \- base class for all terms
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 4
\& # 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 );
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
SQL::Statement::Term is an abstract base class providing the interface
for all terms.
.SH "INHERITANCE"
.IX Header "INHERITANCE"
.Vb 1
\& SQL::Statement::Term
.Ve
.SH "METHODS"
.IX Header "METHODS"
.SS "new"
.IX Subsection "new"
Instantiates new term and stores a weak reference to the owner.
.SS "value"
.IX Subsection "value"
\&\fIAbstract\fR method which will return the value of the term. Must be
overridden by derived classes.
.SS "\s-1DESTROY\s0"
.IX Subsection "DESTROY"
Destroys the term and undefines the weak reference to the owner.
.SH "NAME"
SQL::Statement::ConstantTerm \- term for constant values
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 4
\& # create a term with an SQL::Statement object as owner
\& my $term = SQL::Statement::ConstantTerm\->new( $owner, \*(Aqfoo\*(Aq );
\& # access the value of that term \- returns \*(Aqfoo\*(Aq
\& $term\->value( $eval );
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
SQL::Statement::ConstantTerm implements a term which will always return the
same constant value.
.SH "INHERITANCE"
.IX Header "INHERITANCE"
.Vb 2
\& SQL::Statement::ConstantTerm
\& ISA SQL::Statement::Term
.Ve
.SH "METHODS"
.IX Header "METHODS"
.SS "new"
.IX Subsection "new"
Instantiates new term and stores the constant to deliver and a weak
reference to the owner.
.SS "value"
.IX Subsection "value"
Returns the specified constant.
.SH "NAME"
SQL::Statement::ColumnValue \- term for column values
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 5
\& # create a term with an SQL::Statement object as owner
\& my $term = SQL::Statement::ColumnValue\->new( $owner, \*(Aqid\*(Aq );
\& # access the value of that term \- returns the value of the column \*(Aqid\*(Aq
\& # of the currently active row in $eval
\& $term\->value( $eval );
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
SQL::Statement::ColumnValue implements a term which will return the specified
column of the active row.
.SH "INHERITANCE"
.IX Header "INHERITANCE"
.Vb 2
\& SQL::Statement::ColumnValue
\& ISA SQL::Statement::Term
.Ve
.SH "METHODS"
.IX Header "METHODS"
.SS "new"
.IX Subsection "new"
Instantiates new term and stores the column name to deliver and a weak
reference to the owner.
.SS "value"
.IX Subsection "value"
Returns the specified column value.
.SH "AUTHOR AND COPYRIGHT"
.IX Header "AUTHOR AND COPYRIGHT"
Copyright (c) 2009\-2020 by Jens Rehsack: rehsackATcpan.org
.PP
All rights reserved.
.PP
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.