没有字段名称的mongodb查询结果
问题描述：
有没有办法只用值而不用字段名来获取 mongodb 查询结果.我的查询给了我以下结果:
Is there a way to get mongodb query results with only the values and not the field names. My query gives me the following result:
{
"t_number" : 2508
},
{
"t_number" : 2560
},
{
"t_number" : 2599
}
理想情况下，我希望查询结果为 [2508,2560,2599].或者，如果这不可能，是否可以将查询结果设为 [{2508},{2560},{2599}].我知道我可以迭代结果并更改我的编程语言中的格式.我正在寻找一种方法来从 mongodb 获取它并节省一些工作.
Ideally I want the query result to be [2508,2560,2599]. Or if that is not possible, is it possible to get the query result as [{2508},{2560},{2599}]. I know that I can iterate over the result and change the format in my programming language. I am looking for a way to get that from mongodb and save some work.
答
不，你不能直接做.
但是这个衬垫可以帮助您:
But this one liner could help you:
db.collection.find({},{_id:0, t_number:1}).toArray().map(function(ele) {return ele.t_number} );