本文實例講述了Java操作Mongodb數據庫實現數據的增刪查改功能。分享給大家供大家參考，具體如下：
首先，我們在windows下安裝mongodb數據庫，安裝教程可查看前面一篇文章：http://www.jfrwli.cn/article/63476.html
代碼如下：
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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 static 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("刪除數據成功！"); 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("插入數據成功！"); 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("數據更新成功！"); return true; }else return false; }} |
附：完整實例代碼點擊此處本站下載。
希望本文所述對大家java程序設計有所幫助。
原文鏈接：http://blog.csdn.net/zwc2xm/article/details/72869590
