6

MongoDB は初めてで、jsp/servlet を使用して簡単なサイトを作成する必要があります。

サイトにアクセスした回数のカウントを返すクエリを作成する必要があります。

私のDBは次のようになります。

{ "_id" : { "$oid" : "5117fa92f1d3a4093d0d3902"} , "ip" : "127.0.0.1" , "datum" : { "$date" : "2013-02-10T19:52:50.051Z"} , "odlaznaStr" : "localhost:8080/mongoProjekat/" , "dolaznaStr" : "localhost:8080/mongoProjekat/treca"}<br>
{ "_id" : { "$oid" : "5117fa92f1d3a4093d0d3903"} , "ip" : "127.0.0.1" , "datum" : { "$date" : "2013-02-10T19:52:50.796Z"} , "odlaznaStr" : "localhost:8080/mongoProjekat/treca.jsp" , "dolaznaStr" : "localhost:8080/mongoProjekat/peta"}<br>
{ "_id" : { "$oid" : "5117fa93f1d3a4093d0d3904"} , "ip" : "127.0.0.1" , "datum" : { "$date" : "2013-02-10T19:52:51.141Z"} , "odlaznaStr" : "localhost:8080/mongoProjekat/peta.jsp" , "dolaznaStr" : "localhost:8080/mongoProjekat/treca"}<br>
{ "_id" : { "$oid" : "5117fa93f1d3a4093d0d3905"} , "ip" : "127.0.0.1" , "datum" : { "$date" : "2013-02-10T19:52:51.908Z"} , "odlaznaStr" : "localhost:8080/mongoProjekat/treca.jsp" , "dolaznaStr" : "localhost:8080/mongoProjekat/cetvrta"}<br>
{ "_id" : { "$oid" : "5117fa94f1d3a4093d0d3906"} , "ip" : "127.0.0.1" , "datum" : { "$date" : "2013-02-10T19:52:52.035Z"} , "odlaznaStr" : "localhost:8080/mongoProjekat/treca.jsp" , "dolaznaStr" : "localhost:8080/mongoProjekat/cetvrta"}<br>
{ "_id" : { "$oid" : "5117fa94f1d3a4093d0d3907"} , "ip" : "127.0.0.1" , "datum" : { "$date" : "2013-02-10T19:52:52.197Z"} , "odlaznaStr" : "localhost:8080/mongoProjekat/cetvrta.jsp" , "dolaznaStr" : "localhost:8080/mongoProjekat/treca"}

私が必要としているのは、次のような結果です。

page: localhost:8080/mongoProjekat/treca visited: n(times)<br>
page: localhost:8080/mongoProjekat/druga visited: n(times)

...など、アクセスしたすべてのページについて。

ちなみに、私はJavaを使用しています。

4

2 に答える 2

10

この SQL から MongoDB へのチャートhttp://docs.mongodb.org/manual/reference/sql-aggregation-comparison/が役立つ場合があります。

あなたの当面の質問について：

    // getCollection

    DBCollection myColl = db.getCollection("toskebre");

    // for the $group operator
    // note - the collection still has the field name "dolaznaStr"
    // but, to we access "dolaznaStr" in the aggregation command, 
    // we add a $ sign in the BasicDBObject 

    DBObject groupFields = new BasicDBObject( "_id", "$dolaznaStr");

    // we use the $sum operator to increment the "count" 
    // for each unique dolaznaStr 
    groupFields.put("count", new BasicDBObject( "$sum", 1));
    DBObject group = new BasicDBObject("$group", groupFields );


    // You can add a sort to order by count descending

    DBObject sortFields = new BasicDBObject("count", -1);
    DBObject sort = new BasicDBObject("$sort", sortFields );


    AggregationOutput output = myColl.aggregate(group, sort);

    System.out.println( output.getCommandResult() );

println は次のように出力します。

{ "serverUsed" : "localhost/127.0.0.1:27017" , 
  "result" : [ { "_id" : "localhost:8080/mongoProjekat/treca" , "count" : 3} , 
               { "_id" : "localhost:8080/mongoProjekat/cetvrta" , "count" : 2} ,
               { "_id" : "localhost:8080/mongoProjekat/peta" , "count" : 1}] , 
  "ok" : 1.0}
于 2013-02-11T15:43:10.367 に答える
0

答えケイのタイ。私はすでにあなたに似た解決策を見つけました。私はこのようにしました：

     DBObject match = new BasicDBObject("stranica","$dolaznaStr");
     DBObject project = new BasicDBObject("$project",match);

     DBObject id = new BasicDBObject("_id",new BasicDBObject("stranica","$stranica"));
     id.put("posete", new BasicDBObject("$sum", 1));
     DBObject group = new BasicDBObject("$group",id);

     DBObject srt = new BasicDBObject("posete",-1);
     DBObject sort = new BasicDBObject("$sort", srt);
     AggregationOutput ao = collection.aggregate(project, group, sort);
于 2013-02-11T17:26:21.007 に答える