/* * CountData.java * * Created on 2006年10月18日, 下午4:44 * * To change this template, choose Tools | Options and locate the template under * the Source Creation and Management node. Right-click the template and choose * Open. You can then make changes to the template in the Source Editor. */
package com.tot.count;
/** * * @author http://www.tot.name */ public class CountBean { private String countType; int countId; /** Creates a new instance of CountData */ public CountBean() {} public void setCountType(String countTypes){ this.countType=countTypes; } public void setCountId(int countIds){ this.countId=countIds; } public String getCountType(){ return countType; } public int getCountId(){ return countId; } }
CountCache.java
/* * CountCache.java * * Created on 2006年10月18日, 下午5:01 * * To change this template, choose Tools | Options and locate the template under * the Source Creation and Management node. Right-click the template and choose * Open. You can then make changes to the template in the Source Editor. */
package com.tot.count; import java.util.*; /** * * @author http://www.tot.name */ public class CountCache { public static LinkedList list=new LinkedList(); /** Creates a new instance of CountCache */ public CountCache() {} public static void add(CountBean cb){ if(cb!=null){ list.add(cb); } } }
CountControl.java
/* * CountThread.java * * Created on 2006年10月18日, 下午4:57 * * To change this template, choose Tools | Options and locate the template under * the Source Creation and Management node. Right-click the template and choose * Open. You can then make changes to the template in the Source Editor. */
package com.tot.count; import tot.db.DBUtils; import java.sql.*; /** * * @author http://www.tot.name */ public class CountControl{ private static long lastExecuteTime=0;//上次更新时间 private static long executeSep=60000;//定义更新间隔时间，单位毫秒 /** Creates a new instance of CountThread */ public CountControl() {} public synchronized void executeUpdate(){ Connection conn=null; PreparedStatement ps=null; try{ conn = DBUtils.getConnection(); conn.setAutoCommit(false); ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); for(int i=0;i＜CountCache.list.size();i++){ CountBean cb=(CountBean)CountCache.list.getFirst(); CountCache.list.removeFirst(); ps.setInt(1, cb.getCountId()); ps.executeUpdate();⑴ //ps.addBatch();⑵ } //int [] counts = ps.executeBatch();⑶ conn.commit(); }catch(Exception e){ e.printStackTrace(); } finally{ try{ if(ps!=null) { ps.clearParameters(); ps.close(); ps=null; } }catch(SQLException e){} DBUtils.closeConnection(conn); } } public long getLast(){ return lastExecuteTime; } public void run(){ long now = System.currentTimeMillis(); if ((now - lastExecuteTime) ＞ executeSep) { //System.out.print("lastExecuteTime:"+lastExecuteTime); //System.out.print(" now:"+now+"\n"); // System.out.print(" sep="+(now - lastExecuteTime)+"\n"); lastExecuteTime=now; executeUpdate(); } else{ //System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); } } } //注：如果你的数据库驱动支持批处理，那么可以将⑵,⑶标记的代码前的注释去掉，同时在代码⑴前加上注释
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