在MongoDB中使用JSON？ [英] Using JSON with MongoDB?

问题描述

我的应用程序大量使用JSON对象（org.json.JSONArray和朋友）。将这些存储到Mongo DBObject中的最有效方法是什么，以便可以查询它们？ BasicDBObject无法序列化JSONArray - 这两个层次结构似乎根本没有互操作性。

My application uses JSON objects a lot (org.json.JSONArray and friends). What's the most efficient way to store these into Mongo DBObjects so they can be queried? BasicDBObject can't serialize a JSONArray--there seems to be no interoperability between these two hierarchies at all.

推荐答案

好像好像没有互操作性，所以我自己动手了。绕过类型系统的繁忙工作：

OK it seems there is no interoperability, so I rolled my own. Busywork to get around the type system:

public class Util {
    public static DBObject encode(JSONArray a) {
        BasicDBList result = new BasicDBList();
        try {
            for (int i = 0; i < a.length(); ++i) {
                Object o = a.get(i);
                if (o instanceof JSONObject) {
                    result.add(encode((JSONObject)o));
                } else if (o instanceof JSONArray) {
                    result.add(encode((JSONArray)o));
                } else {
                    result.add(o);
                }
            }
            return result;
        } catch (JSONException je) {
            return null;
        }
    }

    public static DBObject encode(JSONObject o) {
        BasicDBObject result = new BasicDBObject();
        try {
            Iterator i = o.keys();
            while (i.hasNext()) {
                String k = (String)i.next();
                Object v = o.get(k);
                if (v instanceof JSONArray) {
                    result.put(k, encode((JSONArray)v));
                } else if (v instanceof JSONObject) {
                    result.put(k, encode((JSONObject)v));
                } else {
                    result.put(k, v);
                }
            }
            return result;
        } catch (JSONException je) {
            return null;
        }
    }
}

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