有时要为每一篇文章统计其点击次数,如果每一次浏览都要更新一次库的话,那性能在访问量很大的情况下,服务器的压力就会很大了,比较好一点的方法就是先将要更新的数据缓存起来,然后每隔一段时间再利用数据库的批量处理,批量更新库。源码如下: m MWhUr
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CountBean.java r~oUln<[
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/* ![vy{U.:`
* CountData.java L*4=b
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* Created on 2007年1月1日, 下午4:44 8WpNlB+:{
* \h0+`
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* To change this template, choose Tools | Options and locate the template under M%Vp_
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* the Source Creation and Management node. Right-click the template and choose Lc]hwMGR*
* Open. You can then make changes to the template in the Source Editor. dN:^RCFzS
*/ fk1d iB
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package com.tot.count; Vu4LC&q
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/** *u,xBC2C
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* @author ]-a/)8
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public class CountBean { cG@Wo8+
private String countType; Qz2jV
int countId; /|h+,]<
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/** Creates a new instance of CountData */ YD9vWk\/
public CountBean() {} u$ci{<
public void setCountType(String countTypes){ )#hR}|
this.countType=countTypes; {,T=Siy
} x{So
public void setCountId(int countIds){ '0_W<lGB
this.countId=countIds; k$#1T +(G
} [ z/G
public String getCountType(){ #u\~AO?h
return countType; z-"P raP
} S+mBVk"-~S
public int getCountId(){ I1dOMu9
return countId; ?
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} h. 4#C}> )
} u$ o19n
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CountCache.java I*a.!/$)
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/* Hl{ul'o
* CountCache.java *&h]PhY
* n? =O@yq
* Created on 2007年1月1日, 下午5:01 {3K]Q=
* OH]45bd
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* To change this template, choose Tools | Options and locate the template under 4W E)2vkS
* the Source Creation and Management node. Right-click the template and choose $ER$|9)KD
* Open. You can then make changes to the template in the Source Editor. I)r6*|mz
*/ }"%mP 4]&
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package com.tot.count; ~%
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import java.util.*; S?D]P'<
/** z
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* @author Wap\J7NY
*/ ]ERAt^$0
public class CountCache { V@gG
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public static LinkedList list=new LinkedList(); =dQF}-{!
/** Creates a new instance of CountCache */ P9S)7&+DL
public CountCache() {} '%TD#!a
public static void add(CountBean cb){ dPV<:uO
if(cb!=null){ E\9HZ;}G
list.add(cb); 5UK}AkEe&x
} ! z5c+JqN
} J5Q.v;
} &Akw V-
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CountControl.java v9f%IE4fX
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/* :zO;E+s
* CountThread.java !g|[A7<|
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* Created on 2007年1月1日, 下午4:57 =t~]@?]1D
* o{hZjn-
* To change this template, choose Tools | Options and locate the template under 3(*vZ
* the Source Creation and Management node. Right-click the template and choose mOyNl
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* Open. You can then make changes to the template in the Source Editor. w=ufJRj
*/ Zba<|C
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package com.tot.count; fNyXDCl
import tot.db.DBUtils; 'fzJw
import java.sql.*; zpNt[F?~1
/** ]'>jw#|h
* jsKKg^g
* @author I.SMn,N
*/ $0~1;@`rQ6
public class CountControl{ LJ z6)kz
private static long lastExecuteTime=0;//上次更新时间 N!\1O,
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 EVLDP\w{
/** Creates a new instance of CountThread */ *rV{(%\m
public CountControl() {} R.GDCGAL
public synchronized void executeUpdate(){ N];K
Connection conn=null; 9Nz}'a;?>
PreparedStatement ps=null; 8`I,KkWg
try{ (Bpn9}F-V.
conn = DBUtils.getConnection(); DD>n-8M@>
conn.setAutoCommit(false); <p`
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ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); Dv^M/z2&[
for(int i=0;i<CountCache.list.size();i++){ k@>(sXs
CountBean cb=(CountBean)CountCache.list.getFirst(); lx~C{tl2
CountCache.list.removeFirst(); ys7Tq+
ps.setInt(1, cb.getCountId()); CSNz8
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ps.executeUpdate();⑴ XF@34b5(
//ps.addBatch();⑵ z'gJy
} ]2@lyG#<<
//int [] counts = ps.executeBatch();⑶ d5=&