Java操作Mongodb数据库实现数据的增删查改功能示例

Java操作Mongodb数据库实现数据的增删查改功能示例

本文实例讲述了java操作Mongodb数据库实现数据的增删查改功能。分享给大家供大家参考，具体如下：

首先，我们在windows下安装mongodb数据库，安装教程可查看前面一篇文章：//jb51.net/article/85605.htm

代码如下：

package io.mogo;

import java.util.Map;

import org.apache.commons.lang3.StringUtils;

import com.mongodb.BasicDBObject;

import com.mongodb.DB;

import com.mongodb.DBCollection;

import com.mongodb.DBCursor;

import com.mongodb.DBObject;

import com.mongodb.Mongo;

import com.mongodb.WriteResult;

/**

* Hello world!

*

*/

public class App

{

private static final String host = "localhost";

private static final int port = 27017;

private static final String userName = "";

private sBaLcmzCntatic final String password = "";

private static final String dataBaseName = "test";

private static DB db;

public static void main( String[] args ) throws Exception

{

System.out.println( "Hello World!" );

connMongoDB();

find("person", "name", "xiaoming");

DBObject newObj = new BasicDBObject();

newObj.put("name", "xiaoming");

newObj.put("desc", "i am xiaoming");

update("person", "name", "xiaoming", newObj);

find("person", "name", "xiaoming");

}

public static void connMongoDB() throws Exception {

Mongo mongo = new Mongo(host, port);

db = mongo.getDB(dataBaseName);

if (!StringUtils.isEmpty(userName) || !StringUtils.isEmpty(password)) {

db.authenticate(userName, password.toCharArray());

}

}

public static void find(String tableName, String key, String value){

DBObject obj = new BasicDBObject();

obj.put(key, value);

DBCollection dbCollection = db.getCollection(tableName);

DBCursor dbCursor = dbCollection.find(obj);

while(dbCursor.hasNext()){

Map map = (Map)dbCursor.next();

System.out.println(map);

}

}

public static boolean delete(String tableName, String key, String value){

DBObject obj = new BasicDBObject();

obj.put(key, value);

DBCollection dbCollection = db.getCollection(tableName);

WriteResult result = dbCollection.remove(obj);

if(result.getN() > 0){

System.out.println("删除数据成功！");

return true;

}else{

return false;

}

}

public static boolean insert(String tableName, DBObject obj){

DBCollection dbCollection = db.getCollection(tableName);

long num = dbCollection.count();

dbCollection.insert(obj);

if(dbCollection.count() - num > 0){

System.out.println("插入数据成功！");

return true;

}else{

return false;

}

}

public static boolean update(String tableName, String key, String value, DBObject newValue){

DBObject obj = new BasicDBObject();

obj.put(key, value);

DBCollection dbCollection = db.getCollection(tableName);

DBObject oldValue = dbCollection.findOne(obj);

WriteResult result = dbCollection.update(oldValue, newValue);

if(result.getN() > 0){

System.out.println("数据更新成功！");

return true;

}else

return false;

}

}

附：完整实例代码点击此处本站下载。

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