mongoDB 测试代码

import java.net.UnknownHostException;  
import java.util.Iterator;  
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.MongoException;  

public class mongoDB {  
    private static final String HOST = "127.0.0.1";  
    private static final int PORT = 27017;  
    private static final String USER = "ha";  
    private static final String PASSWORD = "ha";  
    private static final String DB_NAME = "jiang";  
    private static final String COLLECTION = "test";  
    private static Mongo conn=null;  
    private static DB myDB=null;  
    private static DBCollection myCollection=null;  
      
    static{  
        try {  
            conn=new Mongo(HOST,PORT);//建立数据库连接  
            myDB=conn.getDB(DB_NAME);//使用test数据库  
            boolean loginSuccess=myDB.authenticate(USER, PASSWORD.toCharArray());//用户验证  
            if(loginSuccess){  
                myCollection=myDB.getCollection(COLLECTION);  
            }  
        } catch (UnknownHostException e) {  
            e.printStackTrace();  
        } catch (MongoException e) {  
            e.printStackTrace();  
        }  
    }  
      
    /** 
     * 更新“表”数据 
     * @param collection 
     */  
    private static void updateData(DBCollection collection){  
        DBObject updateCondition=new BasicDBObject();  
          
        //where name='fox'  
        updateCondition.put("a", 1);  
          
        DBObject updatedValue=new BasicDBObject();  
        updatedValue.put("b", 3);  
        updatedValue.put("c", 4);  
          
        DBObject updateSetValue=new BasicDBObject("$set",updatedValue);  
        /** 
         * update insert_test set headers=3 and legs=4 where name='fox' 
         * updateCondition:更新条件 
         * updateSetValue:设置的新值 
         */  
        collection.update(updateCondition, updateSetValue);  
          
        DBObject queryCondition=new BasicDBObject();  
          
        //where name='sam',此条件在更新前不是成立的  
        queryCondition.put("a", 2);  
          
        DBObject setValue=new BasicDBObject();  
        setValue.put("b", 1);  
        setValue.put("c", 1);  
          
        DBObject upsertValue=new BasicDBObject("$set",setValue);  
        /** 
         * 后面两个参数含义分别是： 
         * 若所更新的数据没有，则插入 
         * ，同时更新多个符合条件的文档(collection) 
         */  
        collection.update(queryCondition, upsertValue, true, true);  
        //set headers=headers+2  
        DBObject incValue=new BasicDBObject("b",2);  
        //set legs=4  
        DBObject legsValue=new BasicDBObject("c",6);  
          
        DBObject allCondition=new BasicDBObject();  
        allCondition.put("$inc", incValue);  
        allCondition.put("$set", legsValue);  
          
        collection.update(queryCondition, allCondition);  
    }  
      
    /** 
     * 返回查询结果集 
     * @param collection 
     * @return 
     */  
    private static DBCursor queryData(DBCollection collection){  
        DBCursor queriedData=collection.find();  
        return queriedData;  
          
    }  
      
    /** 
     * 打印结果数据 
     * @param description　结果数据相关描述 
     * @param recordResult　结果集 
     */  
    private static void printData(String description,DBCursor recordResult){  
        System.out.println(description);  
        for(Iterator iter=recordResult.iterator();iter.hasNext();){  
            System.out.println(iter.next());
          
        }  
    }  
      
      
    /** 
     * @param args 
     */  
    public static void main(String[] args) {  
        printData("查看一下更新前的数据：",queryData(myCollection)); 

//        //更新数据  
        updateData(myCollection);  
        printData("查看一下更新后的数据：",queryData(myCollection));  
          
    } 
}