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Manual Reference Pages  -  DBIX::SQLENGINE::CRITERIA (3)

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NAME

DBIx::SQLEngine::Criteria - Struct for database criteria info

CONTENTS

SYNOPSIS



  my $crit = DBIx::SQLEngine::Criteria->type_new( $type, ... );
 
  print $crit->sql_where();



DESCRIPTION

DBIx::SQLEngine::Criteria objects hold information about particular query criteria.

REFERENCE

    Constructor

Multiple subclasses based on type.
new Abstract. Implemented in each subclass
type_new


  DBIx::SQLEngine::Criteria->type_new( $type, @args ) : $criteria



Looks up type, then calls new.

type Multiple subclasses based on type. (See subclass_name in Class::MakeMethods::Template::ClassName.)

    Generic Argument Parsing

auto


  DBIx::SQLEngine::Criteria->auto( $sql_string ) : $criteria
  DBIx::SQLEngine::Criteria->auto( [ $sql_string, @params ] ) : $criteria
  DBIx::SQLEngine::Criteria->auto( { fieldname => matchvalue, ... } ) : $criteria
  DBIx::SQLEngine::Criteria->auto( $criteria_object ) : $criteria_object



Convert any one of several standard criteria representations into a DBIx::SQLEngine::Criteria object.

auto_and


  DBIx::SQLEngine::Criteria->auto( @any_of_the_above ) : $criteria



Create a single criteria requiring the satisfaction of each of the separate criteria passed in. Supports the same argument forms as auto.

auto_where


  DBIx::SQLEngine::Criteria->auto_where( @any_of_the_above ) : $sql, @params



Create a single criteria requiring the satisfaction of each of the separate criteria passed in, and returns its sql_where results. Supports the same argument forms as auto.

INCLUDED SUBCLASSES

The following criteria subclasses are included in this distribution:

    Logical Groupings

And Requires all of its subclauses to be true.
Or Requires at least one of its subclauses to be true.
Not Requires its one subclause to be false.

    Comparison

Equality Requires an exact match with its comparison value.
Greater Requires a value higher than its comparison value.
Lesser Requires a value lower than its comparison value.
Like Requires a value that matches its comparison value, including any SQL wildcards.
StringComparison Functions as an Equality unless a wildcard is used, in which case it’s a Like.

    Programmer Convenience

HashGroup Easy way to create a group of StringComparison criteria.
LiteralSQL Encapsulates a snippet of literal SQL, optionally with placeholder parameters.

    Backwards Compatibility

StringEquality Empty subclass to support an old name for Equality Criteria.
NumericLesser Empty subclass to support an old name for Lesser Criteria.

SEE ALSO

See DBIx::SQLEngine for the overall interface and developer documentation.

See DBIx::SQLEngine::Docs::ReadMe for general information about this distribution, including installation and license information.

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perl v5.20.3 SQLENGINE::CRITERIA (3) 2004-04-20

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