MongoDB - 查询集合中的嵌套项

Question

我有一个mongodb集合＆＃34;结果＆＃34;使用

等数据

{ "_id" : { 
           "user" : "Howard", 
           "friend" : "Sita" 
           }, 
"value" : {
          "mutualFriend" :[ "Hanks", "Bikash", "Shyam", "Bakshi" ] 
          } 
}

{ "_id" : {
          "user" : "Shiva", 
          "friend" : "Tom" 
          }, 
  "value" : { 
          "friendList" :[ "Hanks", " Tom", " Karma", " Hari", " Dinesh" ] 
            }
}

{ "_id" : { 
         "user" : "Hari", 
         "friend" : "Shiva" 
          }, 
 "value" : { 
          "mutualFriend" :[ "Tom", "Karma", "Dinesh" ] 
           } 
 }

现在，我想查询具有value.mutualFriend的整个文档。我怎样才能得到结果？

预期输出

{ "_id" : { 
           "user" : "Howard", 
           "friend" : "Sita" 
           }, 
"value" : {
          "mutualFriend" :[ "Hanks", "Bikash", "Shyam", "Bakshi" ] 
          } 
}
{ "_id" : { 
         "user" : "Hari", 
         "friend" : "Shiva" 
          }, 
 "value" : { 
          "mutualFriend" :[ "Tom", "Karma", "Dinesh" ] 
           } 
 }

我在MongoDB集合中有大量文档，包含value.friendList和value.mutualFriend，然后我只想找到value.mutualFriend

的文档

Answer 1

getWeeklyOpenPositions(boolean flagCurrently){
String query="SELECT * FROM Report WHERE Open_TS BETWEEN '20160101' AND '20161230'";

if(flagCurrently)
{
 query=query+ " AND close_TS>NOW()";
} 
}

它只是确保第0个元素存在。您可以在各种数组长度上自定义查询。