package com.infomorrow.webroot;
import java.util.List;
import com.mongodb.BasicDBObject;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.DBCursor;
import com.mongodb.DBObject;
import com.mongodb.MongoClient;
public class test_mongodb {
    public static void  main(String args[]) throws Exception {
        MongoClient        mongoClient = new MongoClient( "127.0.0.1" , 27017 );//建立連線
        DB get_db_credit = mongoClient.getDB("credit_2");//資料庫名
        DBCollection collection = get_db_credit.getCollection("report");//集合名，對應mysql中的表名
        BasicDBObject filter_dbobject = new BasicDBObject();

        //建立查詢條件,如果還有其他條件，類似的寫即可
        // 如:version=3,filter_dbobject.put("version", 3),mongod區分String 和 Integer型別，所以要小心"3"!=3
        filter_dbobject.put("user_id", "10065716153075");

        //下面執行查詢，設定limit,只要10條資料,排序(類mysql orderby) 再建一個BasicDBObject即可，－1表示倒序
        DBCursor cursor = collection.find(filter_dbobject).limit(10).sort(new BasicDBObject("create_time",-1));

        //把結果集輸出成list型別
        List<DBObject> list = cursor.toArray();
        System.out.println(list.size());//list的長度
        System.err.println(cursor.count());//計算結果的數量，類似於(mysql count()函式),不受limit的影響

        
        //遍歷結果集
        while(cursor.hasNext()) {
            System.out.println(cursor.next());
        }
    }
}