mongodb查询以在json中查找值

Question

I started working with MongoDB. I prepared some basic training JSON:

{
  "header": {
      "Hotel": {
      "data": [
          {
          "name": "Hilton",
          "Id": "1231213421"
          }
      ]
      },
      "standard": "5",
      "priceStage": "4"
  },
  "data": {
      "http": {
      "strean": {}
      }
  }
}

and I wrote a query like this:

db.hotel.find( "data": { Id: "1231213421"})

Why query does not return anything?

Answer 1

You're trying to match on an element within an array and you don't need to match on the entire array. So,something like the following will work:

db.hotel.find({"header.Hotel.data": {"$elemMatch": {"Id": "1231213421"}}} );