Update::execute

public Update::execute()

public function execute() {
  $max_placeholder = 0;
  $blobs = array();
  $blob_count = 0;

  // Because we filter $fields the same way here and in __toString(), the
  // placeholders will all match up properly.
  $stmt = $this->connection->prepareQuery((string) $this);

  // Fetch the list of blobs and sequences used on that table.
  $table_information = $this->connection->schema()->queryTableInformation($this->table);

  // Expressions take priority over literal fields, so we process those first
  // and remove any literal fields that conflict.
  $fields = $this->fields;
  foreach ($this->expressionFields as $field => $data) {
    if (!empty($data['arguments'])) {
      foreach ($data['arguments'] as $placeholder => $argument) {
        // We assume that an expression will never happen on a BLOB field,
        // which is a fairly safe assumption to make since in most cases
        // it would be an invalid query anyway.
        $stmt->bindParam($placeholder, $data['arguments'][$placeholder]);
      }
    }
    if ($data['expression'] instanceof SelectInterface) {
      $data['expression']->compile($this->connection, $this);
      $select_query_arguments = $data['expression']->arguments();
      foreach ($select_query_arguments as $placeholder => $argument) {
        $stmt->bindParam($placeholder, $select_query_arguments[$placeholder]);
      }
    }
    unset($fields[$field]);
  }

  foreach ($fields as $field => $value) {
    $placeholder = ':db_update_placeholder_' . ($max_placeholder++);

    if (isset($table_information->blob_fields[$field])) {
      $blobs[$blob_count] = fopen('php://memory', 'a');
      fwrite($blobs[$blob_count], $value);
      rewind($blobs[$blob_count]);
      $stmt->bindParam($placeholder, $blobs[$blob_count], \PDO::PARAM_LOB);
      ++$blob_count;
    }
    else {
      $stmt->bindParam($placeholder, $fields[$field]);
    }
  }

  if (count($this->condition)) {
    $this->condition->compile($this->connection, $this);

    $arguments = $this->condition->arguments();
    foreach ($arguments as $placeholder => $value) {
      $stmt->bindParam($placeholder, $arguments[$placeholder]);
    }
  }

  $options = $this->queryOptions;
  $options['already_prepared'] = TRUE;
  $options['return'] = Database::RETURN_AFFECTED;

  $this->connection->addSavepoint();
  try {
    $result = $this->connection->query($stmt, array(), $options);
    $this->connection->releaseSavepoint();
    return $result;
  }
  catch (\Exception $e) {
    $this->connection->rollbackSavepoint();
    throw $e;
  }
}