NAME

SQL::Statement::Operation - base class for all operation terms

SYNOPSIS

# create an operation with an SQL::Statement object as owner, specifying
# the operation name (for error purposes), the left and the right
# operand
my $term = SQL::Statement::Operation->new( $owner, $op, $left, $right );
# access the result of that operation
$term->value( $eval );

DESCRIPTION

SQL::Statement::Operation is an abstract base class providing the interface for all operation terms.

INHERITANCE

SQL::Statement::Operation
ISA SQL::Statement::Term

METHODS

new

Instantiates new operation term.

value

Return the result of the operation of the term by calling operate

operate

Abstract method which will do the operation of the term. Must be overridden by derived classes.

DESTROY

Destroys the term and undefines the weak reference to the owner as well as the stored operation, the left and the right operand.

NAME

SQL::Statement::Operation::Neg - negate operation

SYNOPSIS

# create an <not> operation with an SQL::Statement object as owner,
# specifying the operation name, the left and B<no> right operand
my $term = SQL::Statement::Neg->new( $owner, $op, $left, undef );
# access the result of that operation
$term->value( $eval );

DESCRIPTION

SQL::Statement::Operation::Neg

INHERITANCE

SQL::Statement::Operation::Neg
ISA SQL::Statement::Operation
  ISA SQL::Statement::Term

METHODS

operate

Return the logical negated value of the left operand.

NAME

SQL::Statement::Operation::And - and operation

SYNOPSIS

# create an C<and> operation with an SQL::Statement object as owner,
# specifying the operation name, the left and the right operand
my $term = SQL::Statement::And->new( $owner, $op, $left, $right );
# access the result of that operation
$term->value( $eval );

DESCRIPTION

SQL::Statement::Operation::And implements the logical and operation between two terms.

INHERITANCE

SQL::Statement::Operation::And
ISA SQL::Statement::Operation
  ISA SQL::Statement::Term

METHODS

operate

Return the result of the logical and operation for the values of the left and right operand.

NAME

SQL::Statement::Operation::Or - or operation

SYNOPSIS

# create an C<or> operation with an SQL::Statement object as owner,
# specifying the operation name, the left and the right operand
my $term = SQL::Statement::Or->new( $owner, $op, $left, $right );
# access the result of that operation
$term->value( $eval );

DESCRIPTION

SQL::Statement::Operation::Or implements the logical or operation between two terms.

INHERITANCE

SQL::Statement::Operation::Or
ISA SQL::Statement::Operation
  ISA SQL::Statement::Term

METHODS

operate

Return the result of the logical or operation for the values of the left and right operand.

NAME

SQL::Statement::Operation::Is - is operation

SYNOPSIS

# create an C<is> operation with an SQL::Statement object as owner,
# specifying the operation name, the left and the right operand
my $term = SQL::Statement::Is->new( $owner, $op, $left, $right );
# access the result of that operation
$term->value( $eval );

DESCRIPTION

SQL::Statement::Operation::Is supports: IS NULL, IS TRUE and IS FALSE. The right operand is always evaluated in boolean contect in case of IS TRUE and IS FALSE. IS NULL returns true even if the left term is an empty string ('').

INHERITANCE

SQL::Statement::Operation::Is
ISA SQL::Statement::Operation
  ISA SQL::Statement::Term

METHODS

operate

Returns true when the left term is null, true or false - based on the requested right value.

NAME

SQL::Statement::Operation::Contains - in operation

SYNOPSIS

# create an C<in> operation with an SQL::Statement object as owner,
# specifying the operation name, the left and the right operand
my $term = SQL::Statement::Contains->new( $owner, $op, $left, $right );
# access the result of that operation
$term->value( $eval );

DESCRIPTION

SQL::Statement::Operation::Contains expects the right operand is an array of SQL::Statement::Term instances. It checks whether the left operand is in the list of the right operands or not like:

$left->value($eval) ~~ map { $_->value($eval) } @{$right}

INHERITANCE

SQL::Statement::Operation::Contains
ISA SQL::Statement::Operation
  ISA SQL::Statement::Term

METHODS

operate

Returns true when the left term is equal to any of the right terms

NAME

SQL::Statement::Operation::Between - between operation

SYNOPSIS

# create an C<between> operation with an SQL::Statement object as owner,
# specifying the operation name, the left and the right operand
my $term = SQL::Statement::Between->new( $owner, $op, $left, $right );
# access the result of that operation
$term->value( $eval );

DESCRIPTION

SQL::Statement::Operation::Between expects the right operand is an array of 2 SQL::Statement::Term instances. It checks whether the left operand is between the right operands like:

   ( $left->value($eval) >= $right[0]->value($eval) )
&& ( $left->value($eval) <= $right[1]->value($eval) )

INHERITANCE

SQL::Statement::Operation::Between
ISA SQL::Statement::Operation
  ISA SQL::Statement::Term

METHODS

operate

Returns true when the left term is between both right terms

NAME

SQL::Statement::Operation::Equality - abstract base class for comparisons

SYNOPSIS

# create an C<equality> operation with an SQL::Statement object as owner,
# specifying the operation name, the left and the right operand
my $term = SQL::Statement::Equality->new( $owner, $op, $left, $right );
# access the result of that operation
$term->value( $eval );

DESCRIPTION

SQL::Statement::Operation::Equality implements compare operations between two terms - choosing either numerical comparison or string comparison, depending wherther both operands are a numeric or not.

INHERITANCE

SQL::Statement::Operation::Equality
ISA SQL::Statement::Operation
  ISA SQL::Statement::Term

METHODS

operate

Return the result of the comparison.

numcmp

Abstract method which will do the numeric comparison of both terms. Must be overridden by derived classes.

strcmp

Abstract method which will do the string comparison of both terms. Must be overridden by derived classes.

NAME

SQL::Statement::Operation::Equal - implements equal operation

SYNOPSIS

# create an C<equal> operation with an SQL::Statement object as owner,
# specifying the operation name, the left and the right operand
my $term = SQL::Statement::Equal->new( $owner, $op, $left, $right );
# access the result of that operation
$term->value( $eval );

DESCRIPTION

SQL::Statement::Operation::Equal implements compare operations between two numbers and two strings.

INHERITANCE

SQL::Statement::Operation::Equal
ISA SQL::Statement::Operation::Equality
  ISA SQL::Statement::Operation
    ISA SQL::Statement::Term

METHODS

numcmp

Return true when $left == $right

strcmp

Return true when $left eq $right

NAME

SQL::Statement::Operation::NotEqual - implements not equal operation

SYNOPSIS

# create an C<not equal> operation with an SQL::Statement object as owner,
# specifying the operation name, the left and the right operand
my $term = SQL::Statement::NotEqual->new( $owner, $op, $left, $right );
# access the result of that operation
$term->value( $eval );

DESCRIPTION

SQL::Statement::Operation::NotEqual implements negated compare operations between two numbers and two strings.

INHERITANCE

SQL::Statement::Operation::NotEqual
ISA SQL::Statement::Operation::Equality
  ISA SQL::Statement::Operation
    ISA SQL::Statement::Term

METHODS

numcmp

Return true when $left != $right

strcmp

Return true when $left ne $right

NAME

SQL::Statement::Operation::Lower - implements lower than operation

SYNOPSIS

# create an C<lower than> operation with an SQL::Statement object as owner,
# specifying the operation name, the left and the right operand
my $term = SQL::Statement::Lower->new( $owner, $op, $left, $right );
# access the result of that operation
$term->value( $eval );

DESCRIPTION

SQL::Statement::Operation::Lower implements lower than compare operations between two numbers and two strings.

INHERITANCE

SQL::Statement::Operation::Lower
ISA SQL::Statement::Operation::Equality
  ISA SQL::Statement::Operation
    ISA SQL::Statement::Term

METHODS

numcmp

Return true when $left < $right

strcmp

Return true when $left lt $right

NAME

SQL::Statement::Operation::Greater - implements greater than operation

SYNOPSIS

# create an C<greater than> operation with an SQL::Statement object as owner,
# specifying the operation name, the left and the right operand
my $term = SQL::Statement::Greater->new( $owner, $op, $left, $right );
# access the result of that operation
$term->value( $eval );

DESCRIPTION

SQL::Statement::Operation::Greater implements greater than compare operations between two numbers and two strings.

INHERITANCE

SQL::Statement::Operation::Greater
ISA SQL::Statement::Operation::Equality
  ISA SQL::Statement::Operation
    ISA SQL::Statement::Term

METHODS

numcmp

Return true when $left $right>

strcmp

Return true when $left gt $right

NAME

SQL::Statement::Operation::LowerEqual - implements lower equal operation

SYNOPSIS

# create an C<lower equal> operation with an SQL::Statement object as owner,
# specifying the operation name, the left and the right operand
my $term = SQL::Statement::LowerEqual->new( $owner, $op, $left, $right );
# access the result of that operation
$term->value( $eval );

DESCRIPTION

SQL::Statement::Operation::LowerEqual implements lower equal compare operations between two numbers and two strings.

INHERITANCE

SQL::Statement::Operation::LowerEqual
ISA SQL::Statement::Operation::Equality
  ISA SQL::Statement::Operation
    ISA SQL::Statement::Term

METHODS

numcmp

Return true when $left <= $right

strcmp

Return true when $left le $right

NAME

SQL::Statement::Operation::GreaterEqual - implements greater equal operation

SYNOPSIS

# create an C<greater equal> operation with an SQL::Statement object as owner,
# specifying the operation name, the left and the right operand
my $term = SQL::Statement::GreaterEqual->new( $owner, $op, $left, $right );
# access the result of that operation
$term->value( $eval );

DESCRIPTION

SQL::Statement::Operation::GreaterEqual implements greater equal compare operations between two numbers and two strings.

INHERITANCE

SQL::Statement::Operation::GreaterEqual
ISA SQL::Statement::Operation::Equality
  ISA SQL::Statement::Operation
    ISA SQL::Statement::Term

METHODS

numcmp

Return true when $left = $right>

strcmp

Return true when $left ge $right

NAME

SQL::Statement::Operation::Regexp - abstract base class for comparisons based on regular expressions

SYNOPSIS

# create an C<regexp> operation with an SQL::Statement object as owner,
# specifying the operation name, the left and the right operand
my $term = SQL::Statement::Regexp->new( $owner, $op, $left, $right );
# access the result of that operation
$term->value( $eval );

DESCRIPTION

SQL::Statement::Operation::Regexp implements the comparisons for the LIKE operation family.

INHERITANCE

SQL::Statement::Operation::Regexp
ISA SQL::Statement::Operation
  ISA SQL::Statement::Term

METHODS

operate

Return the result of the comparison.

right

Returns the regular expression based on the right term. The right term is expected to be constant - so a LIKE b in not supported.

regexp

Abstract method which must return a regular expression (qr//) from the given string. Must be overridden by derived classes.

NAME

SQL::Statement::Operation::Like - implements the like operation

SYNOPSIS

# create an C<like> operation with an SQL::Statement object as owner,
# specifying the operation name, the left and the right operand
my $term = SQL::Statement::Like->new( $owner, $op, $left, $right );
# access the result of that operation
$term->value( $eval );

DESCRIPTION

SQL::Statement::Operation::Like is used to to the comparisons for the LIKE operation.

INHERITANCE

SQL::Statement::Operation::Like
ISA SQL::Statement::Operation::Regexp
  ISA SQL::Statement::Operation
    ISA SQL::Statement::Term

METHODS

regexp

Returns qr/^$right$/s

NAME

SQL::Statement::Operation::Clike - implements the clike operation

SYNOPSIS

# create an C<clike> operation with an SQL::Statement object as owner,
# specifying the operation name, the left and the right operand
my $term = SQL::Statement::Clike->new( $owner, $op, $left, $right );
# access the result of that operation
$term->value( $eval );

DESCRIPTION

SQL::Statement::Operation::Clike is used to to the comparisons for the CLIKE operation.

INHERITANCE

SQL::Statement::Operation::Clike
ISA SQL::Statement::Operation::Regexp
  ISA SQL::Statement::Operation
    ISA SQL::Statement::Term

METHODS

regexp

Returns qr/^$right$/si

NAME

SQL::Statement::Operation::RLike - implements the rlike operation

SYNOPSIS

# create an C<rlike> operation with an SQL::Statement object as owner,
# specifying the operation name, the left and the right operand
my $term = SQL::Statement::RLike->new( $owner, $op, $left, $right );
# access the result of that operation
$term->value( $eval );

DESCRIPTION

SQL::Statement::Operation::RLike is used to to the comparisons for the RLIKE operation.

INHERITANCE

SQL::Statement::Operation::RLike
ISA SQL::Statement::Operation::Regexp
  ISA SQL::Statement::Operation
    ISA SQL::Statement::Term

METHODS

regexp

Returns qr/$right$/s

AUTHOR AND COPYRIGHT

Copyright (c) 2009 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.

cpanm SQL::Statement

perl -MCPAN -e shell
install SQL::Statement