如何使用嵌入式文檔查詢mongodb

Question

嗨，我正在練習mongodb，我遇到了問題。 我是以下幾套文件。

{
    "_id" : ObjectId("57cf9a134607674792dbad9e"),
    "address" : {
        "building" : "351",
        "coord" : [ 
            -73.9851356, 
            40.7676919
        ],
        "street" : "West   57 Street",
        "zipcode" : "10019"
    },
    "borough" : "Manhattan",
    "cuisine" : "Irish",
    "grades" : [ 
        {
            "date" : ISODate("2014-09-06T00:00:00.000Z"),
            "grade" : "A",
            "score" : 2
        }, 
        {
            "date" : ISODate("2013-07-22T00:00:00.000Z"),
            "grade" : "A",
            "score" : 11
        }, 
        {
            "date" : ISODate("2012-07-31T00:00:00.000Z"),
            "grade" : "A",
            "score" : 12
        }, 
        {
            "date" : ISODate("2011-12-29T00:00:00.000Z"),
            "grade" : "A",
            "score" : 12
        }
    ],
    "name" : "Dj Reynolds Pub And Restaurant",
    "restaurant_id" : "30191841"
}

我想獲取所有文件的列表，其中zipcode是10019我正在關注mongodb數據庫教程，我已經嘗試了以下查詢，但似乎沒有任何工作，我得到零錯誤。

 db.restaurants.find({address:{zipcode:10019}});
    db.restaurants.find({"address.zipcode":10019})

Answer 1

zipcode是一個字符串，因此您的查詢應該是

db.restaurants.find({ "address.zipcode": "10019" })

代替

db.restaurants.find({ "address.zipcode": 10019 })