Get only specific fields using getFieldData?

I can get all "information_schema.columns" using:

PHP Code:

$this->db->getFieldData( $table ); 


But, how do I get only info on specific columns, like 'name' and 'type'.
I'm looking for the equivalent of:

PHP Code:

EXAMPLE: SELECT column_name, data_type FROM information_schema.columns WHERE table_name = '$table'; 


By default I get all these:

Code:

default, max_length, name, nullable, primary_key, type

I'm only interested in:

Code:

name, type