interface/modules/zend_modules/library/Zend/Db/Sql/Predicate/IsNull.php

   1 <?php
   2 /**
   3  * Zend Framework (http://framework.zend.com/)
   4  *
   5  * @link      http://github.com/zendframework/zf2 for the canonical source repository
   6  * @copyright Copyright (c) 2005-2013 Zend Technologies USA Inc. (http://www.zend.com)
   7  * @license   http://framework.zend.com/license/new-bsd New BSD License
   8  */
   9
  10 namespace Zend\Db\Sql\Predicate;
  11
  12 class IsNull implements PredicateInterface
  13 {
  14
  15     /**
  16      * @var string
  17      */
  18     protected $specification = '%1$s IS NULL';
  19
  20     /**
  21      * @var
  22      */
  23     protected $identifier;
  24
  25     /**
  26      * Constructor
  27      *
  28      * @param  string $identifier
  29      */
  30     public function __construct($identifier = null)
  31     {
  32         if ($identifier) {
  33             $this->setIdentifier($identifier);
  34         }
  35     }
  36
  37     /**
  38      * Set identifier for comparison
  39      *
  40      * @param  string $identifier
  41      * @return IsNull
  42      */
  43     public function setIdentifier($identifier)
  44     {
  45         $this->identifier = $identifier;
  46         return $this;
  47     }
  48
  49     /**
  50      * Get identifier of comparison
  51      *
  52      * @return null|string
  53      */
  54     public function getIdentifier()
  55     {
  56         return $this->identifier;
  57     }
  58
  59     /**
  60      * Set specification string to use in forming SQL predicate
  61      *
  62      * @param  string $specification
  63      * @return IsNull
  64      */
  65     public function setSpecification($specification)
  66     {
  67         $this->specification = $specification;
  68         return $this;
  69     }
  70
  71     /**
  72      * Get specification string to use in forming SQL predicate
  73      *
  74      * @return string
  75      */
  76     public function getSpecification()
  77     {
  78         return $this->specification;
  79     }
  80
  81     /**
  82      * Get parts for where statement
  83      *
  84      * @return array
  85      */
  86     public function getExpressionData()
  87     {
  88         return array(array(
  89             $this->getSpecification(),
  90             array($this->identifier),
  91             array(self::TYPE_IDENTIFIER),
  92         ));
  93     }
  94 }