1 files changed, 57 insertions, 4 deletions
diff --git a/includes/database/query.inc b/includes/database/query.inc
index dd6a4da9a..d22c0751a 100644
--- a/includes/database/query.inc
+++ b/includes/database/query.inc
@@ -48,6 +48,26 @@ interface QueryConditionInterface {
   public function where($snippet, $args = array());
 
   /**
+   * Set a condition that the specified field be NULL.
+   *
+   * @param $field
+   *   The name of the field to check.
+   * @return
+   *   The called object.
+   */
+  public function isNull($field);
+
+  /**
+   * Set a condition that the specified field be NOT NULL.
+   *
+   * @param $field
+   *   The name of the field to check.
+   * @return
+   *   The called object.
+   */
+  public function isNotNull($field);
+
+  /**
    * Gets a complete list of all conditions in this conditional clause.
    *
    * This method returns by reference. That allows alter hooks to access the
@@ -749,6 +769,16 @@ class DeleteQuery extends Query implements QueryConditionInterface {
     return $this;
   }
 
+  public function isNull($field) {
+    $this->condition->isNull($field);
+    return $this;
+  }
+
+  public function isNotNull($field) {
+    $this->condition->isNotNull($field);
+    return $this;
+  }
+
   public function &conditions() {
     return $this->condition->conditions();
   }
@@ -852,6 +882,16 @@ class UpdateQuery extends Query implements QueryConditionInterface {
     return $this;
   }
 
+  public function isNull($field) {
+    $this->condition->isNull($field);
+    return $this;
+  }
+
+  public function isNotNull($field) {
+    $this->condition->isNotNull($field);
+    return $this;
+  }
+
   public function &conditions() {
     return $this->condition->conditions();
   }
@@ -1012,6 +1052,14 @@ class DatabaseCondition implements QueryConditionInterface, Countable {
     return $this;
   }
 
+  public function isNull($field) {
+    return $this->condition($field, NULL, 'IS NULL');
+  }
+
+  public function isNotNull($field) {
+    return $this->condition($field, NULL, 'IS NOT NULL');
+  }
+
   public function &conditions() {
     return $this->conditions;
   }
@@ -1061,6 +1109,7 @@ class DatabaseCondition implements QueryConditionInterface, Countable {
               'postfix' => '',
               'delimiter' => '',
               'operator' => $condition['operator'],
+              'use_value' => TRUE,
             );
             $operator = $connection->mapConditionOperator($condition['operator']);
             if (!isset($operator)) {
@@ -1079,10 +1128,12 @@ class DatabaseCondition implements QueryConditionInterface, Countable {
               $condition['value'] = array($condition['value']);
             }
             $placeholders = array();
-            foreach ($condition['value'] as $value) {
-              $placeholder = ':db_condition_placeholder_' . $next_placeholder++;
-              $arguments[$placeholder] = $value;
-              $placeholders[] = $placeholder;
+            if ($operator['use_value']) {
+              foreach ($condition['value'] as $value) {
+                $placeholder = ':db_condition_placeholder_' . $next_placeholder++;
+                $arguments[$placeholder] = $value;
+                $placeholders[] = $placeholder;
+              }
             }
             $condition_fragments[] = ' (' . $condition['field'] . ' ' . $operator['operator'] . ' ' . $operator['prefix'] . implode($operator['delimiter'], $placeholders) . $operator['postfix'] . ') ';
 
@@ -1122,6 +1173,8 @@ class DatabaseCondition implements QueryConditionInterface, Countable {
       'IN' => array('delimiter' => ', ', 'prefix' => ' (', 'postfix' => ')'),
       'NOT IN' => array('delimiter' => ', ', 'prefix' => ' (', 'postfix' => ')'),
       'LIKE' => array('operator' => 'LIKE'),
+      'IS NULL' => array('use_value' => FALSE),
+      'IS NOT NULL' => array('use_value' => FALSE),
     );
 
     $return = isset($specials[$operator]) ? $specials[$operator] : array();