dbimpl3.java

来自「springGather 在JAVA环境开发的电信运营支持系统」· Java 代码 · 共 93 行

package lianxi;

import org.hibernate.*;
import org.hibernate.cfg.*;
import org.com.gather.*;
import org.com.gather.exception.*;

import java.util.*;
import java.sql.*;

public class DBImpl3 implements DB{
	private Properties pro = null;
	private Log log = null;
	private BackUp back = null;

	private static String key = "key";
	private static DBImpl3 instance = null;

	
	//属性由Spring注入
	private DBImpl3(Properties pro){
		this.pro = pro;
	}

	//私有的构造器,为了获取实例,要提供一个静态方法,
	//通过该方法获取实例
	public static DBImpl3 getInstance(Properties pro){
		if(instance == null){
			synchronized(key){
				if(instance == null){
					instance = new DBImpl3(pro);
				}
			}
		}
		return instance;
	}

	public Session getSession(){
		TestSessionFactory factory = TestSessionFactory.getInstance();
		return factory.getHibernateSession();
	}

	public void setLog(Log log){
		this.log = log;
	}

	public void setBackUpServer(BackUp back){
		this.back = back;
	}

	public void storeToDB(Collection col)throws SQLException,ClassNotFoundException,DBException{
		Session session = getSession();
		Transaction tx = session.beginTransaction();
		ArrayList list = new ArrayList();

		//获取批量入库大小
		String s_size = pro.getProperty("batchSize");
		int size = new Integer(s_size).intValue();

		Iterator iter = col.iterator();
		int i = 0;
		//获取入库前的时间
		long start = System.currentTimeMillis();
		//迭代
		while(iter.hasNext()){
			i++;
			BIDR bidr = (BIDR)iter.next();
			iter.remove();
			//把要入库的对象,直接保存到Hibernate的session对象
			session.save(bidr);

			//当积攒的数量达到batch-size之后,再一并入库,
			//并且把缓存的数据清空
			if(i == size){
				//立即执行入库操作
				session.flush();
				//清空session的缓存
				session.clear();
				log.writeDebug("size="+size+" ,清空缓存");
				i = 0;
			}
		}
		//对剩余的数据进行入库操作
		session.flush();
		//清空缓存
		session.clear();
		//提交事务
		tx.commit();
		long end = System.currentTimeMillis();
		log.writeDebug("********入库成功********");
		log.writeInfo("耗时 :"+(end-start)+" ms");
	}
}