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:  jelte
  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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Changes (by stephen):

 * owner:  stephen => jelte


Comment:

 I've moved the !NoSuchSerial exception to data_source.h (rather than
 database.h) on the grounds that (theoretically) any data source could hold
 a differences table.

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Ticket URL: <http://bind10.isc.org/ticket/1330#comment:19>
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