[wp-trac] [WordPress Trac] #21055: Interface for wpdb compatibility

[WordPress Trac]

#21055: Interface for wpdb compatibility
-----------------------------+------------------------------
 Reporter:  santec           |       Owner:
     Type:  feature request  |      Status:  new
 Priority:  normal           |   Milestone:  Awaiting Review
Component:  Database         |     Version:
 Severity:  normal           |  Resolution:
 Keywords:                   |
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Comment (by kurtpayne):

 What if, instead of an interface, we used an abstract class?

 {{{
 abstract class wp_dao {
  // common properties and methods
 }
 class wpdb extends wp_dao {
  // concrete implentation
 }
 }}}

 So things like `delete()` can be added into wp_dao and wpdb without
 breaking back compat.  Children don't have to implement these methods
 unless they're explicitly marked abstract.  Children can either inherit
 from wpdb or wp_dao depending on their use case, and the code can still
 use `$whatever instanceof wp_dao`?

 Anybody currently extending wpdb would be unaffected.

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Ticket URL: <http://core.trac.wordpress.org/ticket/21055#comment:4>
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