Java 对芒果数据库 MongoDB的增删改查入门例子

昨天看了 芒果数据库 开胃菜，如果是使用过传统关系数据，而且对javascript json 比较熟悉的人，理解起来非常容易。所以单纯MongoDB的入门来说，还是非常简单的，今天继续测试用java 实现增删改查，java下的驱动包已经非常成熟，而且已经在大量的生产环境中得到检验。

首先下载 java mongodb 驱动包
下载的地址: github: 这里下载: MongoDB Java Driver jar file download

创建 java 工程进行测试

package com.yihaomen.mongodb.crud;

import java.net.UnknownHostException;
import java.util.Date;
import com.mongodb.BasicDBObject;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.DBCursor;
import com.mongodb.MongoClient;
import com.mongodb.MongoException;

public class App {
	public static void main(String[] args) {

		try {
			/**** Connect to MongoDB ****/
			// Since 2.10.0, uses MongoClient
			MongoClient mongo = new MongoClient("localhost", 27017);

			/**** Get database ****/
			// if database doesn't exists, MongoDB will create it for you
			DB db = mongo.getDB("yihaomen");

			/**** Get collection / table from 'yihaomen' ****/
			// if collection doesn't exists, MongoDB will create it for you
			DBCollection table = db.getCollection("crudCollection");

			/**** Insert ****/
			// create a document to store key and value
			BasicDBObject document = new BasicDBObject();
			document.put("name", "yihaomen");
			document.put("age", 30);
			document.put("createdDate", new Date());
			table.insert(document);

			/**** Find and display ****/
			BasicDBObject searchQuery = new BasicDBObject();
			searchQuery.put("name", "yihaomen");

			DBCursor cursor = table.find(searchQuery);

			while (cursor.hasNext()) {
				System.out.println(cursor.next());
			}

			/**** Update ****/
			// search document where name="yihaomen" and update it with new values
			BasicDBObject query = new BasicDBObject();
			query.put("name", "yihaomen");

			BasicDBObject newDocument = new BasicDBObject();
			newDocument.put("name", "yihaomen-updated");

			BasicDBObject updateObj = new BasicDBObject();
			updateObj.put("$set", newDocument);

			table.update(query, updateObj);

			/**** Find and display ****/
			BasicDBObject searchQuery2 
				= new BasicDBObject().append("name", "yihaomen-updated");

			DBCursor cursor2 = table.find(searchQuery2);

			while (cursor2.hasNext()) {
				System.out.println(cursor2.next());
			}
			
			/**** Remove test ****/
			//BasicDBObject delDocument = new BasicDBObject();
			//newDocument.put("name", "yihaomen-updated");
			//table.remove(delDocument);

			/**** Done ****/
			System.out.println("Done");

		} catch (UnknownHostException e) {
			e.printStackTrace();
		} catch (MongoException e) {
			e.printStackTrace();
		}

	}
}

mongod --config D:\MongoDB2.6\mongo.config