getField()和select()方法的区别

1         $access=M(‘access‘)->where(array(‘role_id‘=>$rid))->select();
2         dump($access);
3         die;

1         $access=M(‘access‘)->where(array(‘role_id‘=>$rid))->getField(‘node_id‘,true);
2         dump($access);
3         die;

1         $access=M(‘access‘)->where(array(‘role_id‘=>$rid))->getField(‘node_id‘);
2         dump($access);
3         die;