在Java中轉換Mongodb查詢

Question

嗨，我的mongo收藏有以下文件

{ 
      "_id" : ObjectId("523db8f324c8fa2acac03703"), 
      "name" : "abc",
      "timestamp" : 1379776720000
}
{ 
      "_id" : ObjectId("523db8f324c8fa2acac03704"), 
      "name" : "abc",
      "timestamp" : 1379776730000
}
{ 
      "_id" : ObjectId("523db8f324c8fa2acac03705"), 
      "name" : "abc1",
      "timestamp" : 1379776800000
}

我寫了mongo查詢來查找給定名稱的最大時間戳，如下所示

db.collections_name.find({"name":"abc"}).sort({"timestamp":-1}).limit(1)

它在mongo shell上工作正常，但我想用Java代碼實現此查詢，即如何用Java編寫相同的查詢。

Answer 1

MongoClient mc = new MongoClient();
DB db = mc.getDB("...");
DBCollection collection = db.getCollection("...");
DBCursor c = collection.find(new BasicDBObject("name","abc")).sort(new BasicDBObject("timestamp",-1)).limit(1);

不要忘記輸入數據庫名稱和集合名稱