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| <?php | |
| /** | |
| * @file | |
| * Contains \Drupal\Core\Database\StatementEmpty. | |
| */ | |
| 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 = array(), $options = array()) { | |
| return FALSE; | |
| } | |
| /** | |
| * {@inheritdoc} | |
| */ | |
| public function getQueryString() { | |
| return ''; | |
| } | |
| /** | |
| * {@inheritdoc} | |
| */ | |
| public function rowCount() { | |
| if ($this->allowRowCount) { | |
| return 0; | |
| } | |
| throw new RowCountException(); | |
| } | |
| /** | |
| * {@inheritdoc} | |
| */ | |
| public function setFetchMode($mode, $a1 = NULL, $a2 = array()) { | |
| return; | |
| } | |
| /** | |
| * {@inheritdoc} | |
| */ | |
| public function fetch($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, $constructor_arguments = NULL) { | |
| return array(); | |
| } | |
| /** | |
| * {@inheritdoc} | |
| */ | |
| public function fetchCol($index = 0) { | |
| return array(); | |
| } | |
| /** | |
| * {@inheritdoc} | |
| */ | |
| public function fetchAllKeyed($key_index = 0, $value_index = 1) { | |
| return array(); | |
| } | |
| /** | |
| * {@inheritdoc} | |
| */ | |
| public function fetchAllAssoc($key, $fetch = NULL) { | |
| return array(); | |
| } | |
| /** | |
| * {@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; | |
| } | |
| } |