在mongo`中运行多个查询 [英] Running multiple queries in mongo`

问题描述

我有一个集合，想要得到一组满足一组条件的结果。我知道Mongo不允许你使用连接，所以我需要运行单独的查询，并将结果连接到一个单一的响应。

但是可以将单独查询的结果合并在一起以获得预期的输出。

有任何基本范例，我可以看到查询结果连在一起。

感谢

例如，我可以加入这两个查询，所以我得到这两个查询的结果：

  coll.find（{coordinates.type：Point}，{coordinates：1}，tailable = True，timeout = False）
   
 
和：
  coll.find（{place.bounding_box.type： Polygon}，{place.bounding_box.coordinates：1}，tailable = True，timeout = False）
  
 
 
解决方案
在您的具体示例中，您不需要单独运行这些查询。您可以加入结果：
  coll.find（
 {$ or：[
 { coordinates.type：Point}，
 {place.bounding_box.type：Polygon} 
] 
}，
 {coordinates place.bounding_box.coordinates：1} 
）
  
 /  $ elementMatch 而不是$或
 
I have a collection and want to get a set of results that met a set of conditions. I understand the Mongo doesn't let you use joins so I would need to run separate queries and join the results into a single response. 

But is it possible to join the results of separate queries together to get the intended output. 

Are there any basic examples I could see query results joined together.

Thanks 

For example could I join these two queries so I get the results of both queries:
coll.find({"coordinates.type" : "Point"},{"coordinates" :1}, tailable = True, timeout = False)
and:
coll.find({"place.bounding_box.type" : "Polygon"},{"place.bounding_box.coordinates" : 1}, tailable = True, timeout = False)

解决方案
In your specific example, you do not need to run those queries separately. You can join the results like so:
coll.find(
  { $or : [ 
      { "coordinates.type" : "Point" }, 
      { "place.bounding_box.type" : "Polygon" } 
    ] 
  },
  {"coordinates" :1, "place.bounding_box.coordinates" : 1}
)
You can also use $and / $elementMatch instead of an $or

                        
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