PDO FETCH_CLASS and Namespacing issue

问题

I am trying to use PDO::FETCH_CLASS on an object. I am using namespacing and just entering:

$result = $query->fetchAll(\PDO::FETCH_CLASS, 'Product');

or

$result = $query->fetchAll(\PDO::FETCH_CLASS, '\Product');

results in PHP looking for Product.php in the root of the app.

I can successfully instantiate a new Product though using:

 $product = new Product();

So I know my name spacing is working.

Is this not possible? Or do I need to instantiate a Product first then populate it after from the query?

回答1:

I'd suspect PDO does not look up aliased class names or resolve the current namespace. So you have to pass it explicitely:

= $query->fetchAll(\PDO::FETCH_CLASS,  __NAMESPACE__ . '\\Product');

Exactness nitpick: Note that while a single backslash does work, in single quotes it is intended to escape literal single quotes and itself.

来源：https://stackoverflow.com/questions/7914914/pdo-fetch-class-and-namespacing-issue