Arrays 在密钥数组上搜索或筛选couchdb

我的视图中有以下功能：

emit([doc.address.country,doc.address.state, doc.address.city], doc);

查询搜索时，我需要填写数组的所有3个元素，例如：

?key=["US","NY","New York"]

?key=["US"]   

这将生成我的记录，但比方说，我只想返回美国的所有内容，例如：

?key=["US","NY","New York"]

?key=["US"]   

或者在美国和美国

?key=["US","NY"] 

或者。。。让我们说也许我想要纽约的所有唱片。。。（我知道下面的选项不起作用）

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如果要将数组中的一个元素保留为空，我真的不知道如何搜索？

首先：

key=[“US”]在数组键[“US”，“NY”]上不起作用，因为您正在寻找精确的[“US”]键。相反，你必须使用

startkey=["US"]&endkey=["US",{}] 

然后，这些键位于结果集中：

["DE","Bavaria","Munich"]   <---- NO ! "DE" is out of Range of startkey
["US","FL","Miami"]         <---- YES, starts with "US"
["US","NY","New York"]      <---- YES, starts with "US"
["VE","XX","Vencuela City"] <---- NO ! "VE" is out of Range of endkey

结果:

["DE","Bavaria","Munich"]   <---- NO ! "DE" is out of Range of startkey
["US","FL","Miami"]         <---- YES, starts with "US","FL"
["US","NY","New York"]      <---- NO, "US","NY" is out of Range of endkey
["VE","XX","Vencuela City"] <---- NO ! "VE" is out of Range of endkey

查看“byCityStateCountry”：

当然，只需在第一个位置放置一个标志来确定查询的类型，这样您就可以在一个视图中完成所有操作：

emit([1,address.country,doc.address.state, doc.address.city], doc);
emit([2,doc.address.state, doc.address.city,address.country], doc);
emit([3,address.city,doc.address.state, doc.address.country], doc);

用法：

?startkey=[1,"US"]&endkey=[1,"US",{}]
?startkey=[2,"FL"]&endkey=[2,"FL",{}]
?startkey=[3,"Miami"]&endkey=[3,"Miami",{}]

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注意：“左边不能有空格…”-我认为如果有降序=trues，则情况正好相反。我知道这是旧的，但也应该注意，如果键数组有很多元素，它会变得更复杂。使用这些键在视图中假设以下数据：

startkey==[a，11]和endkey=[c，11]：

[a，10]，[a，11]
emit([1,address.country,doc.address.state, doc.address.city], doc);
emit([2,doc.address.state, doc.address.city,address.country], doc);
emit([3,address.city,doc.address.state, doc.address.country], doc);

?startkey=[1,"US"]&endkey=[1,"US",{}]
?startkey=[2,"FL"]&endkey=[2,"FL",{}]
?startkey=[3,"Miami"]&endkey=[3,"Miami",{}]