增量Mongodb更新

Question

我正在尝试通过解析csv并计算每个人去过一个国家或州的次数（如果他们在美国境内）来逐步更新我的数据库。

 public static void main(String[] args) throws UnknownHostException  {          

    Scanner dir = new Scanner(System.in);
    String dir_loc;
    System.out.println("Enter File Directory:");
    dir_loc=dir.nextLine();

    Scanner dbloc = new Scanner(System.in);
    String db_loc;
    System.out.println("Enter Database location:");
    db_loc=dbloc.nextLine();

    Scanner port = new Scanner(System.in);
    int port_loc;
    System.out.println("Enter Port:");
    port_loc=port.nextInt();                

    dir.close();
    dbloc.close();
    port.close();

    System.out.println("uploading");        

    String directoryName = dir_loc; 
    File directory = new File(directoryName);
    File[] fileList = directory.listFiles();                

    DB dB = (new MongoClient(db_loc, port_loc)).getDB("visits"); 
    DBCollection dBCollection = dB.getCollection("Channel");
    BasicDBObject doc = null;
    for(File file: fileList) {      

        String dataFileName = file.toString();
        BufferedReader bReader = null;
        try {
            bReader = new BufferedReader(new FileReader(dataFileName));
        } catch (FileNotFoundException e2) {
            e2.printStackTrace();
            System.exit(-1);
        }
        String line = null;
        int count = 0;
        int statecount = 0;

        try {

            while((line = bReader.readLine()) !=null) {

                String dataValue[] = line.split("\t");                              
                String user_id = (dataValue[2]);
                String country = (dataValue[1]);                                            

                boolean user_idExists = dBCollection.equals(user_id);
                if(user_idExists){
                    if(dataValue[1].equals("US")) {
                        String state = (dataValue[5]);
                        System.out.println(state); 
                        boolean stateExists = dBCollection.equals(state);
                        if(stateExists){                                
                            statecount ++;
                            doc = new BasicDBObject("user_id", user_id).append("country", country).append("state", state)
                                    .append("count", statecount);                               
                        }
                        else{                               
                            statecount = 1;
                            doc = new BasicDBObject("user_id", user_id).append("country", country).append("state", state)
                                    .append("count", statecount);                               
                        }                           
                        }
                    else{
                        boolean countryExists = dBCollection.equals(country);
                        if(countryExists){
                            count ++;
                            doc = new BasicDBObject("user_id", user_id).append("country", country).append("count", count);
                        }
                        else{
                            count = 1;
                            doc = new BasicDBObject("user_id", user_id).append("country", country).append("count", count);
                        }
                    }
                }                       
                else {                      
                    count = 1;
                    doc = new BasicDBObject("user_id", user_id).append("country", country).append("count", count);                      
                }
            }                                               

            } catch (IOException e1) {
            e1.printStackTrace();
            System.exit(-1);
        }
        try {

            bReader.close();
        } catch (IOException e) {
            e.printStackTrace();
            System.exit(-1);
        }
    }
    dBCollection.insert(doc);
    System.out.println("upload complete");
}

} 我得到的输出看起来像这样：

{ "_id" : { "$oid" : "53861247d121c16b38b3421d"} , "user_id" : "5406" , "country" : "US" , "state" : "NY" , "count" : 1}
{ "_id" : { "$oid" : "53861247d121c16b38b3421e"} , "user_id" : "5406" , "country" : "US" , "state" : "NY" , "count" : 1}
{ "_id" : { "$oid" : "53861247d121c16b38b3421f"} , "user_id" : "5406" , "country" : "US" , "state" : "NY" , "count" : 1}
{ "_id" : { "$oid" : "53861247d121c16b38b34220"} , "user_id" : "5406" , "country" : "JA" , "count" : 1}
{ "_id" : { "$oid" : "53861247d121c16b38b34220"} , "user_id" : "5406" , "country" : "JA" , "count" : 1}
{ "_id" : { "$oid" : "53861247d121c16b38b34221"} , "user_id" : "5406" , "country" : "SA" , "count" : 1}
{ "_id" : { "$oid" : "53861247d121c16b38b34221"} , "user_id" : "5406" , "country" : "SA" , "count" : 1}
{ "_id" : { "$oid" : "53861247d121c16b38b34221"} , "user_id" : "5406" , "country" : "SA" , "count" : 1}
{ "_id" : { "$oid" : "53861247d121c16b38b34222"} , "user_id" : "5406" , "country" : "US" , "state" : "TX" , "count" : 1}
{ "_id" : { "$oid" : "53861247d121c16b38b34223"} , "user_id" : "5406" , "country" : "US" , "state" : "TX" , "count" : 1}

但它看起来应该是这样的：

{ "_id" : { "$oid" : "53861247d121c16b38b3421d"} , "user_id" : "5406" , "country" : "VN" , "state" : "NY" , "count" : 3}
{ "_id" : { "$oid" : "53861247d121c16b38b34220"} , "user_id" : "5406" , "country" : "JA", "count" : 2}
{ "_id" : { "$oid" : "53861247d121c16b38b34221"} , "user_id" : "5406" , "country" : "SA", "count" : 3}
{ "_id" : { "$oid" : "53861247d121c16b38b34222"} , "user_id" : "5406" , "country" : "US" , "state" : "TX" , "count" : 2}

我不确定为什么我不能让州/国家计数增加？