Question

我正在测试一些Couchdb功能，我希望通过插入日期获得反转顺序的结果，通过“i”字段查询
示例文档：

{
   "_id": "970c3a0fdbb23dde47fb4075091a4d2b",
   "_rev": "1-54448147611ff5e89189bb44e58c1521",
   "doc_type": "Test",
   "e": "3/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/36/2",
   "d": "64/183/329/2/360/10/13/47/6/351/331/320/355/342/7/335/47/18/30/56/18/323/351/325/323/218/163/155/155/155/155",
   "f": "1399305161/1399305185/1399305194/1399305254/1399305314/1399305374/1399305434/1399305447/1399305506/1399305566/1399305626/1399305668/1399305727/1399305787/1399305847/1399305908/1399305963/1399305970/1399306022/1399306068/1399306078/1399306100/1399306159/1399306219/1399306279/1399306308/1399306321/1399306379/1399306439/1399306493/1399306506",
   "i": "3566120224",
   "dated": "1399305161",
   "v": "0/5/6/32/63/63/51/16/35/60/0/10/64/31/64/48/14/31/6/55/60/50/0/0/21/5/34/0/0/0/0",
   "date": "2014-05-05T15:52:42Z"
}

我的观点：

function(doc) {
  if(doc.i && doc.date){
      emit([doc.i,doc.date],1); // 1 to test only
  }
}

我正在测试它：

myview?startkey=["3566120224"]&endkey=["3566120224",{}]&reversed=true

但我得到的数据的日期顺序没有反转

{"total_rows":545,"offset":508,"rows":[
{"id":"407ee687674b783601ce6d7da906515e","key":["3566120224","2014-05-05T14:11:01Z"],"value":1},
{"id":"407ee687674b783601ce6d7da9062b51","key":["3566120224","2014-05-05T14:15:21Z"],"value":1},
{"id":"407ee687674b783601ce6d7da905f4d9","key":["3566120224","2014-05-05T14:19:41Z"],"value":1},
{"id":"407ee687674b783601ce6d7da905b4e1","key":["3566120224","2014-05-05T14:24:01Z"],"value":1},
{"id":"407ee687674b783601ce6d7da905733c","key":["3566120224","2014-05-05T14:28:22Z"],"value":1},
{"id":"407ee687674b783601ce6d7da904e7ea","key":["3566120224","2014-05-05T14:32:42Z"],"value":1},
{"id":"407ee687674b783601ce6d7da9043709","key":["3566120224","2014-05-05T14:37:02Z"],"value":1},
{"id":"407ee687674b783601ce6d7da9039896","key":["3566120224","2014-05-05T14:41:22Z"],"value":1},
{"id":"407ee687674b783601ce6d7da90303be","key":["3566120224","2014-05-05T14:45:43Z"],"value":1},
{"id":"407ee687674b783601ce6d7da90239ae","key":["3566120224","2014-05-05T14:50:03Z"],"value":1},
{"id":"407ee687674b783601ce6d7da9018442","key":["3566120224","2014-05-05T14:54:23Z"],"value":1},
{"id":"407ee687674b783601ce6d7da90104f0","key":["3566120224","2014-05-05T14:58:43Z"],"value":1},
{"id":"407ee687674b783601ce6d7da9007b67","key":["3566120224","2014-05-05T15:03:04Z"],"value":1},
{"id":"90bb394f7a4a581ff4dc78bfaffff448","key":["3566120224","2014-05-05T15:07:24Z"],"value":1},
{"id":"90bb394f7a4a581ff4dc78bfafff368e","key":["3566120224","2014-05-05T15:11:44Z"],"value":1},
{"id":"90bb394f7a4a581ff4dc78bfaffe7e65","key":["3566120224","2014-05-05T15:16:05Z"],"value":1},
{"id":"970c3a0fdbb23dde47fb4075091f8e5c","key":["3566120224","2014-05-05T15:24:45Z"],"value":1},
{"id":"970c3a0fdbb23dde47fb4075091f6241","key":["3566120224","2014-05-05T15:29:05Z"],"value":1},
{"id":"970c3a0fdbb23dde47fb4075091f254a","key":["3566120224","2014-05-05T15:33:26Z"],"value":1},
{"id":"970c3a0fdbb23dde47fb4075091ed01b","key":["3566120224","2014-05-05T15:37:46Z"],"value":1},
{"id":"970c3a0fdbb23dde47fb4075091e5f42","key":["3566120224","2014-05-05T15:42:06Z"],"value":1},
{"id":"970c3a0fdbb23dde47fb4075091dd992","key":["3566120224","2014-05-05T15:46:26Z"],"value":1},
{"id":"970c3a0fdbb23dde47fb4075091d3853","key":["3566120224","2014-05-05T15:50:47Z"],"value":1},
{"id":"970c3a0fdbb23dde47fb4075091c9a3c","key":["3566120224","2014-05-05T15:55:07Z"],"value":1},
{"id":"970c3a0fdbb23dde47fb4075091bf465","key":["3566120224","2014-05-05T15:59:27Z"],"value":1},
{"id":"970c3a0fdbb23dde47fb4075091ba442","key":["3566120224","2014-05-05T16:03:47Z"],"value":1},
{"id":"970c3a0fdbb23dde47fb4075091ad482","key":["3566120224","2014-05-05T16:08:08Z"],"value":1},
{"id":"970c3a0fdbb23dde47fb4075091a2130","key":["3566120224","2014-05-05T16:12:28Z"],"value":1},
{"id":"970c3a0fdbb23dde47fb40750919a6ef","key":["3566120224","2014-05-05T16:16:48Z"],"value":1},
{"id":"970c3a0fdbb23dde47fb407509192479","key":["3566120224","2014-05-05T16:21:08Z"],"value":1},
{"id":"970c3a0fdbb23dde47fb40750918a977","key":["3566120224","2014-05-05T16:25:29Z"],"value":1},
{"id":"970c3a0fdbb23dde47fb40750917b468","key":["3566120224","2014-05-05T16:29:49Z"],"value":1},
{"id":"970c3a0fdbb23dde47fb407509170583","key":["3566120224","2014-05-05T16:34:09Z"],"value":1}
]}

我有两次相同的数据（日期和日期[ms date]），1399305161 = 2014-05-05T15：52：42Z 我认为我可以使用更容易为couchdb解析的数据类型来命令结果，但是使用日期字段时无效另外我不需要id字段，如何从结果中排除它？

Answer 1

如果查看here，您会发现reverse不是受支持的查询选项。要反转数据，您需要执行以下操作：

myview?endkey=["3566120224"]&startkey=["3566120224",{}]&descending=false

如果您不想要ID字段，您只需返回最高分组级别的缩减值：

myview?endkey=["3566120224"]&startkey=["3566120224",{}]&descending=false&group_level=2

Answer 2

删除doc.i只需写：

    function(doc) {
      if(doc.i && doc.date){
        emit([doc.date],1); // just removed doc.i
     }
    }

要扭转结果：

您可以更改结果，以便使用降序选项。我认为这是不好的做法，因为它取决于使用此功能的客户端。
假设它是视图的默认使用，我选择将日期作为整数返回。 Date.parse(doc.date).valueof()应该将大纪元时间作为整数或双精度返回。如果你然后用＆＃39; - ＆＃39; （减号）默认情况下，视图将按降序排序。这假设您不需要密钥中的格式化日期。

Couchdb - 如何按日期和没有id字段获得颠倒顺序的结果

2 个答案: