MongoDB demo

增删改查

package mytest.demo.mongo;

import java.net.UnknownHostException;
import java.util.List;

import mytest.demo.mongo.utils.MongoDbUtils;

import org.bson.types.ObjectId;
import org.junit.Test;

import com.mongodb.BasicDBObject;
import com.mongodb.DBCollection;
import com.mongodb.DBCursor;
import com.mongodb.DBObject;
import com.mongodb.Mongo;

public class MongoDbApi {
	
	
	@Test
	public void test() throws UnknownHostException {
		Mongo mongo = MongoDbUtils.getMongo("192.168.6.141", 27017);//new Mongo("localhost:27017");
		List<String> dbName = mongo.getDatabaseNames();

		for(String name:dbName){

			System.out.println("dbName:"+name);

		}
	}
	
	@Test
	public void add() throws UnknownHostException{
		
		//建立起连接...
		/*Mongo mongo=new Mongo("localhost:27017");
		DB db=mongo.getDB("demo");
		DBCollection collection=db.getCollection("employee");*/
		DBCollection collection = MongoDbUtils.getDBCollection("192.168.6.141", 27017,"demo", "employee");
		
		DBObject dbObject =new BasicDBObject ();
		
		dbObject.put("name", "李若亮2");
		dbObject.put("age", 17);
		dbObject.put("gender", "M");
		
		collection.insert(dbObject);
		MongoDbUtils.closeMongo();//mongo.close();
		
	}

	@Test
	public void update() throws UnknownHostException{
		//建立起连接...
/*		Mongo mongo=new Mongo("localhost", 27017);
		
		DB db=mongo.getDB("demo");
		DBCollection collection=db.getCollection("employee");*/
		DBCollection collection = MongoDbUtils.getDBCollection("192.168.6.141", 27017,"demo", "employee");
		
		/**
		 * 1:用于设置更新的条件
		 * 2：用于设置更新的内容的对象
		 * 3：如果没有符合条件的记录，是否新增一条。。 1true/flase
		 * 4：如果有多条记录符合，是否全部更新...
		 * 
		 * 
		 */
		//查找到object id =55e012179d4f1f67f3e21f10
		BasicDBObject queryObj = new BasicDBObject("_id",new ObjectId("55e012179d4f1f67f3e21f10"));
		
		BasicDBObject object = (BasicDBObject) collection.findOne(queryObj);
		
		object.put("name", "王小丫2");
		object.put("age", 20);
		object.put("gender", "F");
		
		//update objectId=55e012179d4f1f67f3e21f10  set Value=
		
		collection.update(queryObj,object);
		
		
		MongoDbUtils.closeMongo();//mongo.close();
	}
	
	@Test
	public void find() throws UnknownHostException{
		//建立起连接...
/*		Mongo mongo=new Mongo("localhost", 27017);
		
		DB db=mongo.getDB("demo");
		DBCollection collection=db.getCollection("employee");*/
		DBCollection collection = MongoDbUtils.getDBCollection("192.168.6.141", 27017,"demo", "employee");
		
		//返回结果集
		DBCursor cursor=collection.find();
		while(cursor.hasNext()){
			DBObject dbObject=cursor.next();
			System.out.println(dbObject.toString());
		}
		MongoDbUtils.closeMongo();//mongo.close();
	}
	
	
	@Test
	public void delete() throws UnknownHostException{
		//建立起连接...
/*		Mongo mongo=new Mongo("localhost", 27017);
		
		DB db=mongo.getDB("demo");
		DBCollection collection=db.getCollection("employee");	*/
		DBCollection collection = MongoDbUtils.getDBCollection("192.168.6.141", 27017,"demo", "employee");
		
		BasicDBObject basicDBObject=new BasicDBObject();
		//{}
		basicDBObject.put("name", "李若亮2");
		//{name:"李若亮"}
		
		collection.remove(basicDBObject);
		MongoDbUtils.closeMongo();//mongo.close();
	}
}

自定义工具类

package mytest.demo.mongo.utils;

import java.net.UnknownHostException;

import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.Mongo;

public class MongoDbUtils {

	private static Mongo mongo = null;
	
	public static Mongo getMongo(String url,int port) throws UnknownHostException {
		mongo = new Mongo(url + ":" + port);
		return mongo;
	}
	
	public static DBCollection getDBCollection(String url,int port,String dbName,String collectionName) throws UnknownHostException {
		MongoDbUtils.getMongo(url, port);
		DB db = mongo.getDB(dbName);
		return db.getCollection(collectionName);
	}
	
	public static void closeMongo() {
		mongo.close();
	}
}