BIND 10 #1068: support writability in the new data source API

[BIND 10 Development]

#1068: support writability in the new data source API
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                   Reporter:         |                 Owner:  jinmei
  jinmei                             |                Status:  accepted
                       Type:  task   |             Milestone:
                   Priority:  major  |  Sprint-20110830
                  Component:  data   |            Resolution:
  source                             |             Sensitive:  0
                   Keywords:         |           Sub-Project:  DNS
            Defect Severity:  N/A    |  Estimated Difficulty:  7.0
Feature Depending on Ticket:         |           Total Hours:  0
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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Comment (by jinmei):

 The first part of this taks is ready for review in the
 trac1068review1 branch.  It contains implementation of update related
 methods of SQLite3Accessor (renamed from SQLite3Database, which is
 part of refactoring change in this branch).

 This branch also merged trac1183 as it seems to be the future
 of the base code.

 Some other notes:
 - as noted above, there are some refactoring changes in this branch
   that are not directly related to the topic of this task.  First is to
   rename "database" to "accessor" in more places of the code.  The
   other is to update/cleanup the internal details of
   sqlite3_accessor.cc by unifying SQL statements in SQLite3Parameters.
   IMO this will improve the readability quite a lot.  I also removed
   commented out unused statements.  We can always add them as we see
   the need for it.
 - there is an important bug fix that is actually in the master:
   getZone() can leave an unfinished statement.  Assuming this branch
   can be merged not so long future, I'd rather fix it within this
   branch.  Right now it's not used in any application, so it should be
   okay.
 - AddRecordColumns and DeleteRecordParams are almost unused right now.
   They will be used in the second half of the task.

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Ticket URL: <http://bind10.isc.org/ticket/1068#comment:4>
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