Implements Drupal\Core\KeyValueStore\KeyValueStoreInterface::setIfNotExists().
Overrides KeyValueStoreInterface::setIfNotExists
public function setIfNotExists($key, $value) {
$result = $this->connection
->merge($this->table)
->insertFields(array(
'collection' => $this->collection,
'name' => $key,
'value' => serialize($value),
))
->condition('collection', $this->collection)
->condition('name', $key)
->execute();
return $result == Merge::STATUS_INSERT;
}