java操作mongodb基本(查詢 排序 輸入list)

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 );//樹立銜接
        DB get_db_credit = mongoClient.getDB("credit_2");//數據庫名
        DBCollection collection = get_db_credit.getCollection("report");//聚集名，對應mysql中的表名
        BasicDBObject filter_dbobject = new BasicDBObject();

        //樹立查詢前提,假如還有其他前提，相似的寫便可
        // 如:version=3,filter_dbobject.put("version", 3),mongod辨別String 和 Integer類型，所以要當心"3"!=3
        filter_dbobject.put("user_id", "10065716153075");

        //上面履行查詢，設置limit,只需10條數據,排序(類mysql orderby) 再建一個BasicDBObject便可，－1表現倒序
        DBCursor cursor = collection.find(filter_dbobject).limit(10).sort(new BasicDBObject("create_time",-1));

        //把成果集輸入成list類型
        List<DBObject> list = cursor.toArray();
        System.out.println(list.size());//list的長度
        System.err.println(cursor.count());//盤算成果的數目，相似於(mysql count()函數),不受limit的影響

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