BIND 10 #1330: Extend DatabaseAccessor to support reading diffs

[BIND 10 Development]

#1330: Extend DatabaseAccessor to support reading diffs
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                   Reporter:         |                 Owner:  stephen
  jinmei                             |                Status:  reviewing
                       Type:  task   |             Milestone:
                   Priority:  major  |  Sprint-20111122
                  Component:  data   |            Resolution:
  source                             |             Sensitive:  0
                   Keywords:         |           Sub-Project:  DNS
            Defect Severity:  N/A    |  Estimated Difficulty:  5
Feature Depending on Ticket:         |           Total Hours:  0
        Add Hours to Ticket:         |
                  Internal?:  0      |
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Comment (by jinmei):

 I happened to notice a couple of things whiel I worked on #1332:

 - there's a missing EXTRA_DIST (I've fixed it on the branch and pushed
   it).  Please be sure pulling it before merge.
 - Is it guaranteed that this SQL statement provides what we want?
 {{{
     "SELECT rrtype, ttl, id, rdata, name FROM diffs "   // DIFF_RECS
         "WHERE zone_id=?1 AND id>=?2 and id<=?3"
 }}}
   That is, wouldn't it be possible that the order of the resulting
   rows is arbitrary?

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Ticket URL: <http://bind10.isc.org/ticket/1330#comment:13>
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