有没有办法让$ this-> dbAdapter :: QUERY_MODE_EXECUTE工作？

Question

$this->dbAdapter is an instance of Zend\Db\Adapter\Adapter

I've tried:

$this->dbAdapter::QUERY_MODE_EXECUTE // unexpected '::' (T_PAAMAYIM_NEKUDOTAYIM)

${this->dbAdapter}::QUERY_MODE_EXECUTE // unexpected '->' (T_OBJECT_OPERATOR)

${$this->dbAdapter}::QUERY_MODE_EXECUTE // Object of class Zend\Db\Adapter\Adapter could not be converted to string

$this->{dbAdapter::QUERY_MODE_EXECUTE} // Class "Local\Namespace\dbAdapter" not found

It seems all I can do is:

$dbAdapter = $this->dbAdapter;
...
$dbAdapter::QUERY_MODE_EXECUTE;

Answer 1

I believe the correct way to reference this is:

use Zend\Db\Adapter\Adapter;

Adapter::QUERY_MODE_EXECUTE

or

\Zend\Db\Adapter\Adapter::QUERY_MODE_EXECUTE

Its a constant, so it doesn't necessarily need to come from the instance itself. The reason you get the T_PAAMAYIM_NEKUDOTAYIM error is because :: is a static scope reference that you can't use in conjunction with $this.