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:https://www.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 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("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。
更多关于java相关内容感兴趣的读者可查看本站专题:《Java+MySQL数据库程序设计总结》、《Java操作Excel技巧总结》、《Java数据结构与算法教程》、《Java文件与目录操作技巧汇总》及《Java操作DOM节点技巧总结》
希望本文所述对大家java程序设计有所帮助。
免责声明:本站发布的内容(图片、视频和文字)以原创、转载和分享为主,文章观点不代表本网站立场,如果涉及侵权请联系站长邮箱:is@yisu.com进行举报,并提供相关证据,一经查实,将立刻删除涉嫌侵权内容。