SQL::Statement::Operation - base class for all operation terms
# 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 );
SQL::Statement::Operation is an abstract base class providing the interface for all operation terms.
SQL::Statement::Operation ISA SQL::Statement::Term
Instantiates new operation term.
Return the result of the operation of the term by calling operate
Abstract method which will do the operation of the term. Must be overridden by derived classes.
Returns the name of the executed operation.
Returns the left operand (if any).
Returns the right operand (if any).
Destroys the term and undefines the weak reference to the owner as well as the stored operation, the left and the right operand.
SQL::Statement::Operation::Neg - negate operation
# 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 );
SQL::Statement::Operation::Neg
SQL::Statement::Operation::Neg ISA SQL::Statement::Operation ISA SQL::Statement::Term
Return the logical negated value of the left operand.
SQL::Statement::Operation::And - and operation
# 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 );
SQL::Statement::Operation::And implements the logical and operation between two terms.
and
SQL::Statement::Operation::And ISA SQL::Statement::Operation ISA SQL::Statement::Term
Return the result of the logical and operation for the values of the left and right operand.
SQL::Statement::Operation::Or - or operation
# 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 );
SQL::Statement::Operation::Or implements the logical or operation between two terms.
or
SQL::Statement::Operation::Or ISA SQL::Statement::Operation ISA SQL::Statement::Term
Return the result of the logical or operation for the values of the left and right operand.
SQL::Statement::Operation::Is - is operation
# 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 );
SQL::Statement::Operation::Is supports: IS NULL, IS TRUE and IS FALSE. The right operand is always evaluated in boolean context in case of IS TRUE and IS FALSE. IS NULL returns true even if the left term is an empty string ('').
IS NULL
IS TRUE
IS FALSE
''
SQL::Statement::Operation::Is ISA SQL::Statement::Operation ISA SQL::Statement::Term
Returns true when the left term is null, true or false - based on the requested right value.
SQL::Statement::Operation::ANSI::Is - is operation
SQL::Statement::Operation::ANSI::Is supports: IS NULL, IS TRUE and IS FALSE. The right operand is always evaluated in boolean context in case of IS TRUE and IS FALSE. IS NULL returns true if the right term is not defined, false otherwise.
SQL::Statement::Operation::Contains - in operation
# 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 );
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}
SQL::Statement::Operation::Contains ISA SQL::Statement::Operation ISA SQL::Statement::Term
Returns true when the left term is equal to any of the right terms
SQL::Statement::Operation::Between - between operation
# 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 );
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) )
SQL::Statement::Operation::Between ISA SQL::Statement::Operation ISA SQL::Statement::Term
Returns true when the left term is between both right terms
SQL::Statement::Operation::Equality - abstract base class for comparisons
# 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 );
SQL::Statement::Operation::Equality implements compare operations between two terms - choosing either numerical comparison or string comparison, depending whether both operands are numeric or not.
SQL::Statement::Operation::Equality ISA SQL::Statement::Operation ISA SQL::Statement::Term
Return the result of the comparison.
Abstract method which will do the numeric comparison of both terms. Must be overridden by derived classes.
Abstract method which will do the string comparison of both terms. Must be overridden by derived classes.
SQL::Statement::Operation::Equal - implements equal operation
# 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 );
SQL::Statement::Operation::Equal implements compare operations between two numbers and two strings.
SQL::Statement::Operation::Equal ISA SQL::Statement::Operation::Equality ISA SQL::Statement::Operation ISA SQL::Statement::Term
Return true when $left == $right
$left == $right
Return true when $left eq $right
$left eq $right
SQL::Statement::Operation::NotEqual - implements not equal operation
# 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 );
SQL::Statement::Operation::NotEqual implements negated compare operations between two numbers and two strings.
SQL::Statement::Operation::NotEqual ISA SQL::Statement::Operation::Equality ISA SQL::Statement::Operation ISA SQL::Statement::Term
Return true when $left != $right
$left != $right
Return true when $left ne $right
$left ne $right
SQL::Statement::Operation::Lower - implements lower than operation
# 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 );
SQL::Statement::Operation::Lower implements lower than compare operations between two numbers and two strings.
SQL::Statement::Operation::Lower ISA SQL::Statement::Operation::Equality ISA SQL::Statement::Operation ISA SQL::Statement::Term
Return true when $left < $right
$left < $right
Return true when $left lt $right
$left lt $right
SQL::Statement::Operation::Greater - implements greater than operation
# 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 );
SQL::Statement::Operation::Greater implements greater than compare operations between two numbers and two strings.
SQL::Statement::Operation::Greater ISA SQL::Statement::Operation::Equality ISA SQL::Statement::Operation ISA SQL::Statement::Term
Return true when $left $right>
$left
Return true when $left gt $right
$left gt $right
SQL::Statement::Operation::LowerEqual - implements lower equal operation
# 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 );
SQL::Statement::Operation::LowerEqual implements lower equal compare operations between two numbers and two strings.
SQL::Statement::Operation::LowerEqual ISA SQL::Statement::Operation::Equality ISA SQL::Statement::Operation ISA SQL::Statement::Term
Return true when $left <= $right
$left <= $right
Return true when $left le $right
$left le $right
SQL::Statement::Operation::GreaterEqual - implements greater equal operation
# 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 );
SQL::Statement::Operation::GreaterEqual implements greater equal compare operations between two numbers and two strings.
SQL::Statement::Operation::GreaterEqual ISA SQL::Statement::Operation::Equality ISA SQL::Statement::Operation ISA SQL::Statement::Term
Return true when $left = $right>
Return true when $left ge $right
$left ge $right
SQL::Statement::Operation::Regexp - abstract base class for comparisons based on regular expressions
# 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 );
SQL::Statement::Operation::Regexp implements the comparisons for the LIKE operation family.
LIKE
SQL::Statement::Operation::Regexp ISA SQL::Statement::Operation ISA SQL::Statement::Term
Returns the regular expression based on the right term. The right term is expected to be constant - so a LIKE b in not supported.
a LIKE b
Abstract method which must return a regular expression (qr//) from the given string. Must be overridden by derived classes.
qr//
SQL::Statement::Operation::Like - implements the like operation
# 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( $eval );
SQL::Statement::Operation::Like is used to the comparisons for the LIKE operation.
SQL::Statement::Operation::Like ISA SQL::Statement::Operation::Regexp ISA SQL::Statement::Operation ISA SQL::Statement::Term
Returns qr/^$right$/s
qr/^$right$/s
SQL::Statement::Operation::Clike - implements the clike operation
# 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( $eval );
SQL::Statement::Operation::Clike is used to the comparisons for the CLIKE operation.
CLIKE
SQL::Statement::Operation::Clike ISA SQL::Statement::Operation::Regexp ISA SQL::Statement::Operation ISA SQL::Statement::Term
Returns qr/^$right$/si
qr/^$right$/si
SQL::Statement::Operation::RLike - implements the rlike operation
# 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( $eval );
SQL::Statement::Operation::RLike is used to the comparisons for the RLIKE operation.
RLIKE
SQL::Statement::Operation::RLike ISA SQL::Statement::Operation::Regexp ISA SQL::Statement::Operation ISA SQL::Statement::Term
Returns qr/$right$/s
qr/$right$/s
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.
To install SQL::Statement, copy and paste the appropriate command in to your terminal.
cpanm
cpanm SQL::Statement
CPAN shell
perl -MCPAN -e shell install SQL::Statement
For more information on module installation, please visit the detailed CPAN module installation guide.