abstract public Query::__toString()
Implements PHP magic __toString method to convert the query to a string.
The toString operation is how we compile a query object to a prepared statement.
string A prepared statement query string for this object.
abstract public function __toString();
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Database!Query!Query.php/function/Query::__toString/8.1.x