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:http://www.zzvips.com/article/63476.html
代码如下:
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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( "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。
希望本文所述对大家java程序设计有所帮助。
原文链接:http://blog.csdn.net/zwc2xm/article/details/72869590