深入淺出MongoDB（六）java操作mongodb增刪改查

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    java操作mysql資料庫的代碼我們已經了如指掌了，增刪改查，java對mongodb資料庫也是類似的操作，先是資料庫連接，再是進行操作。

    首先我們進入進入admin資料庫，然後建立自己的資料庫testMongoDb，進入admin資料庫後，就可以直接進入testMongoDb，因為使用者可以進入系統的資料庫，就是超級管理員，use testMongoDb後，為該資料庫設定使用者名稱和密碼，db.addUser(‘root‘,‘root‘)，這樣我們在程式中連該資料庫，並實現增刪改查，代碼如下所示。

    代碼如下所示：

<pre name="code" class="java">package com.mkyong.core;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.Mongo;import com.mongodb.MongoException;/** * Java + MongoDB Hello world Example *  */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);Mongo mongo = new Mongo("127.0.0.1",27017);          /**** Get database ****/// if database doesn't exists, MongoDB will create it for youDB db = mongo.getDB("testMongoDb");//database username  root  and password root boolean ok = db.authenticate("root","root".toCharArray());if(ok){System.out.println("db connection success！");}{System.out.println("db connection fail ！");}/**** Get collection / table from 'testMongoDb' ****/// if collection doesn't exists, MongoDB will create it for youDBCollection table = db.getCollection("user");/**** Insert ****/// create a document to store key and valueBasicDBObject document = new BasicDBObject();document.put("name", "mkyong");document.put("age", 30);document.put("createdDate", new Date());table.insert(document);/**** Find and display ****/BasicDBObject searchQuery = new BasicDBObject();searchQuery.put("name", "mkyong");DBCursor cursor = table.find(searchQuery);while (cursor.hasNext()) {System.out.println(cursor.next());}/**** Update ****/// search document where name="mkyong" and update it with new valuesBasicDBObject query = new BasicDBObject();query.put("name", "mkyong");BasicDBObject newDocument = new BasicDBObject();newDocument.put("name", "mkyong-updated");BasicDBObject updateObj = new BasicDBObject();updateObj.put("$set", newDocument);table.update(query, updateObj);/**** Find and display ****/BasicDBObject searchQuery2 = new BasicDBObject().append("name", "mkyong-updated");DBCursor cursor2 = table.find(searchQuery2);while (cursor2.hasNext()) {System.out.println(cursor2.next());}/**** Done ****/System.out.println("Done");} catch (UnknownHostException e) {e.printStackTrace();} catch (MongoException e) {e.printStackTrace();}}}

控制台輸入結果如下：

    db connection success！
    db connection fail ！
{ "_id" : { "$oid" : "544073c4d58dfa6e469555ba"} , "name" : "mkyong" , "age" : 30 , "createdDate" : { "$date" : "2014-10-17T01:41:24.479Z"}}

{ "_id" : { "$oid" : "543e154bd58d704982fd38f0"} , "name" : "mkyong-updated" , "age" : 30 , "createdDate" : { "$date" : "2014-10-15T06:33:47.321Z"}}
{ "_id" : { "$oid" : "5440719dd58d08a207605c8e"} , "name" : "mkyong-updated" , "age" : 30 , "createdDate" : { "$date" : "2014-10-17T01:32:13.922Z"}}
{ "_id" : { "$oid" : "544073c4d58dfa6e469555ba"} , "name" : "mkyong-updated" , "age" : 30 , "createdDate" : { "$date" : "2014-10-17T01:41:24.479Z"}}
Done

源碼下載：http://download.csdn.net/detail/lovesummerforever/8047875

深入淺出MongoDB（六）java操作mongodb增刪改查