1SQL::Statement::Term(3)User Contributed Perl DocumentatioSnQL::Statement::Term(3)
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NAME

6       SQL::Statement::Term - base class for all terms
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SYNOPSIS

9         # create a term with an SQL::Statement object as owner
10         my $term = SQL::Statement::Term->new( $owner );
11         # access the value of that term
12         $term->value( $eval );
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DESCRIPTION

15       SQL::Statement::Term is an abstract base class providing the interface
16       for all terms.
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INHERITANCE

19         SQL::Statement::Term
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METHODS

22   new
23       Instantiates new term and stores a weak reference to the owner.
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25   value
26       Abstract method which will return the value of the term. Must be
27       overridden by derived classes.
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29   DESTROY
30       Destroys the term and undefines the weak reference to the owner.
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NAME

33       SQL::Statement::ConstantTerm - term for constant values
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SYNOPSIS

36         # create a term with an SQL::Statement object as owner
37         my $term = SQL::Statement::ConstantTerm->new( $owner, 'foo' );
38         # access the value of that term - returns 'foo'
39         $term->value( $eval );
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DESCRIPTION

42       SQL::Statement::ConstantTerm implements a term which will always return
43       the same constant value.
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INHERITANCE

46         SQL::Statement::ConstantTerm
47         ISA SQL::Statement::Term
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METHODS

50   new
51       Instantiates new term and stores the constant to deliver and a weak
52       reference to the owner.
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54   value
55       Returns the specified constant.
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NAME

58       SQL::Statement::ColumnValue - term for column values
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SYNOPSIS

61         # create a term with an SQL::Statement object as owner
62         my $term = SQL::Statement::ColumnValue->new( $owner, 'id' );
63         # access the value of that term - returns the value of the column 'id'
64         # of the currently active row in $eval
65         $term->value( $eval );
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DESCRIPTION

68       SQL::Statement::ColumnValue implements a term which will return the
69       specified column of the active row.
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INHERITANCE

72         SQL::Statement::ColumnValue
73         ISA SQL::Statement::Term
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METHODS

76   new
77       Instantiates new term and stores the column name to deliver and a weak
78       reference to the owner.
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80   value
81       Returns the specified column value.
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84       Copyright (c) 2009-2017 by Jens Rehsack: rehsackATcpan.org
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86       All rights reserved.
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88       You may distribute this module under the terms of either the GNU
89       General Public License or the Artistic License, as specified in the
90       Perl README file.
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94perl v5.30.1                      2020-01-30           SQL::Statement::Term(3)
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