diff core/lib/Drupal/Core/Database/StatementEmpty.php @ 0:4c8ae668cc8c

Initial import (non-working)

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core/lib/Drupal/Core/Database/StatementEmpty.php	Wed Nov 29 16:09:58 2017 +0000
@@ -0,0 +1,147 @@
+<?php
+
+namespace Drupal\Core\Database;
+
+/**
+ * Empty implementation of a database statement.
+ *
+ * This class satisfies the requirements of being a database statement/result
+ * object, but does not actually contain data.  It is useful when developers
+ * need to safely return an "empty" result set without connecting to an actual
+ * database.  Calling code can then treat it the same as if it were an actual
+ * result set that happens to contain no records.
+ *
+ * @see \Drupal\search\SearchQuery
+ */
+class StatementEmpty implements \Iterator, StatementInterface {
+
+  /**
+   * Is rowCount() execution allowed.
+   *
+   * @var bool
+   */
+  public $allowRowCount = FALSE;
+
+  /**
+   * {@inheritdoc}
+   */
+  public function execute($args = [], $options = []) {
+    return FALSE;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getQueryString() {
+    return '';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function rowCount() {
+    if ($this->allowRowCount) {
+      return 0;
+    }
+    throw new RowCountException();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setFetchMode($mode, $a1 = NULL, $a2 = []) {
+    return;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function fetch($mode = NULL, $cursor_orientation = NULL, $cursor_offset = NULL) {
+    return NULL;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function fetchField($index = 0) {
+    return NULL;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function fetchObject() {
+    return NULL;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function fetchAssoc() {
+    return NULL;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function fetchAll($mode = NULL, $column_index = NULL, $constructor_arguments = NULL) {
+    return [];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function fetchCol($index = 0) {
+    return [];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function fetchAllKeyed($key_index = 0, $value_index = 1) {
+    return [];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function fetchAllAssoc($key, $fetch = NULL) {
+    return [];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function current() {
+    return NULL;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function key() {
+    return NULL;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function rewind() {
+    // Nothing to do: our DatabaseStatement can't be rewound.
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function next() {
+    // Do nothing, since this is an always-empty implementation.
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function valid() {
+    return FALSE;
+  }
+
+}