复制代码 代码如下:
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 );//建立连接
DB get_db_credit = mongoClient.getDB("credit_2");//数据库名
DBCollection collection = get_db_credit.getCollection("report");//集合名,对应mysql中的表名
BasicDBObject filter_dbobject = new BasicDBObject();
//建立查询条件,如果还有其他条件,类似的写即可
// 如:version=3,filter_dbobject.put("version", 3),mongod区分String 和 Integer类型,所以要小心"3"!=3
filter_dbobject.put("user_id", "10065716153075");
//下面执行查询,设置limit,只要10条数据,排序(类mysql orderby) 再建一个BasicDBObject即可,-1表示倒序
DBCursor cursor = collection.find(filter_dbobject).limit(10).sort(new BasicDBObject("create_time",-1));
//把结果集输出成list类型
List<DBObject> list = cursor.toArray();
System.out.println(list.size());//list的长度
System.err.println(cursor.count());//计算结果的数量,类似于(mysql count()函数),不受limit的影响
//遍历结果集
while(cursor.hasNext()) {
System.out.println(cursor.next());
}
}
}