MongoDB系列教程（六）：java操作mongodb實例

更新時間：2015年05月07日 11:27:17 投稿：junjie

這篇文章主要介紹了MongoDB系列教程（六）：java操作mongodb實例,本文講解了java中操作mongodb數(shù)據(jù)增加、刪除、修改、查詢數(shù)據(jù)等代碼實例,需要的朋友可以參考下

java操作mysql數(shù)據(jù)庫的代碼我們已經(jīng)了如指掌了，增刪改查，java對mongodb數(shù)據(jù)庫也是類似的操作，先是數(shù)據(jù)庫連接，再是進(jìn)行操作。

首先我們進(jìn)入進(jìn)入admin數(shù)據(jù)庫，然后建立自己的數(shù)據(jù)庫testMongoDb，進(jìn)入admin數(shù)據(jù)庫后，就可以直接進(jìn)入testMongoDb，因為用戶可以進(jìn)入系統(tǒng)的數(shù)據(jù)庫，就是超級管理員，use testMongoDb后，為該數(shù)據(jù)庫設(shè)置用戶名和密碼，db.addUser('root','root')，這樣我們在程序中連該數(shù)據(jù)庫，并實現(xiàn)增刪改查，代碼如下所示。

代碼如下所示：

復(fù)制代碼代碼如下:

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 you  

            DB 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 you  

            DBCollection table = db.getCollection("user");  

            /**** Insert ****/  

            // create a document to store key and value  

            BasicDBObject 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 values  

            BasicDBObject 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();  

        }  

    }  

}

控制臺輸入結(jié)果如下：

復(fù)制代碼代碼如下:

    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://xiazai.jb51.net/201503/other/mongodb_helloworld.zip

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