代碼以下:java
package com.infomorrow.webroot;mysql
import java.util.List;web
import com.mongodb.BasicDBObject;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.DBCursor;
import com.mongodb.DBObject;
import com.mongodb.MongoClient;sql
public class test_mongodb {
public static void main(String args[]) throws Exception {
MongoClient mongoClient = new MongoClient( "127.0.0.1" , 27017 );//創建鏈接
DB get_db_credit = mongoClient.getDB("credit_2");//數據庫名
DBCollection collection = get_db_credit.getCollection("report");//集合名,對應mysql中的表名
BasicDBObject filter_dbobject = new BasicDBObject();
//創建查詢條件,若是還有其餘條件,相似的寫便可
// 如:version=3,filter_dbobject.put("version", 3),mongod區分String 和 Integer類型,因此要當心"3"!=3
filter_dbobject.put("user_id", "10065716153075");
//下面執行查詢,設置limit,只要10條數據,排序(類mysql orderby) 再建一個BasicDBObject便可,-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類型
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,相似於(mysql count()函數),不受limit的影響
//遍歷結果集
while(cursor.hasNext()) {
System.out.println(cursor.next());
}
}
}mongodb