https://api.drupal.org/api/drupal/core%21lib%21Drupal%21Core%21Database%21Statement%21ResultBase.php/function/ResultBase%3A%3AsetFetchMode/11.x
function ResultBase::setFetchMode | Drupal API
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https://api.drupal.org/api/drupal/core%21lib%21Drupal%21Core%21Database%21StatementInterface.php/function/StatementInterface%3A%3AsetFetchMode/10
function StatementInterface::setFetchMode | Drupal API
functiondrupalapi