PHP Mongo Query NOT NULL

问题:

Anyone know the syntax for writing a php-mongo query to use NOT NULL?

I know how to do this when I query for NULL:

<?php $cursor = $collection->find(array("someField" => null)); 

Is this even possible?

回答1:

Yeah, you want the $ne operator, so

$cursor = $collection->find(array("someField" => array('$ne' => null))); 

回答2:

Basically, the same kind of queries you would use on the Mongo console, you pass as an array to the query methods.

In your case, it could be (if you're checking that the field exists - note that the field could just be absent from the document):

array("someField" => array('$exists' => true))

Or to check if it's not equal to null:

array("someField" => array('$ne' => null))

Watch out for the $ in double quotes, since PHP will consider that a variable.

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