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: QYE7p\
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CountBean.java Ln#a<Rx.E7
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/* Z&yaSB
* CountData.java ]Nk!4"
* ^Ip3A
* Created on 2007年1月1日, 下午4:44 %I4zQiJ%
* nZvU'k:
* To change this template, choose Tools | Options and locate the template under "4}wnu6/
* the Source Creation and Management node. Right-click the template and choose /nB'kg[h\
* Open. You can then make changes to the template in the Source Editor. Aa(<L$e!`
*/ /-*hjX$n
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package com.tot.count; ML!9:vz
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/** ?s{C//
* } ~enEZ
* @author pz}mF D&[
*/ XdIah<F2
public class CountBean { m3
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private String countType; iK}v`xq
int countId; !ng\`
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/** Creates a new instance of CountData */ m4**>!I
public CountBean() {} DzDj)7
public void setCountType(String countTypes){ E[S' :Q
this.countType=countTypes; U )Zt-og
} m6so]xr
public void setCountId(int countIds){ T^)plWw
this.countId=countIds; P>htQ
} g,?\~8-c
public String getCountType(){ 6VR18Y!y
return countType; dq8+m(7k
} EzP#Mnz^
public int getCountId(){ q) _r3
return countId; BMjfqX
} 9s
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} {E~l>Z88
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CountCache.java 8eww7k^R
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/* ?'+8[OHiF^
* CountCache.java 6UB6;-
* + U5U.f%
* Created on 2007年1月1日, 下午5:01 <JH9StGGc?
* %c0z)R~
* To change this template, choose Tools | Options and locate the template under W?PWJkIw
* the Source Creation and Management node. Right-click the template and choose .;Z.F7{q
* Open. You can then make changes to the template in the Source Editor. "yri[X
*/ $'u\B
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package com.tot.count; 3Q$c'C
import java.util.*; `r.N
/** =+(Q.LmhC
* k!c7a\">{
* @author -7L
*/ X8.y4{5
public class CountCache { dqwWfn1lt
public static LinkedList list=new LinkedList(); u2,H ]-
/** Creates a new instance of CountCache */ ]c,l5u}A$
public CountCache() {} s<#N]mp'
public static void add(CountBean cb){ ~._ko
if(cb!=null){ D?J#u;h~f
list.add(cb); UGf6i"F
} N4+g("
} L`pY27|
} UhA_1A'B
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CountControl.java .]zw*t*
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/* $$~a=q,P[
* CountThread.java 1!s!wQgS
* &$Ci}{{n#
* Created on 2007年1月1日, 下午4:57 -PXoMZx%
* .SBc5KX
* To change this template, choose Tools | Options and locate the template under jRwa0Px(
* the Source Creation and Management node. Right-click the template and choose Wa{%0inZ
* Open. You can then make changes to the template in the Source Editor. mc~`
*/ s/PhXf\MN
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package com.tot.count; ]
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import tot.db.DBUtils; ~RCg.&[ou
import java.sql.*; M0L-u
/** 7>KQRLw
* Fi/jR0]e2
* @author [{/$9k-aF?
*/ )ZeLaa P
public class CountControl{ 79a9L{gso
private static long lastExecuteTime=0;//上次更新时间 n8Q*
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒 p*!q}%U
/** Creates a new instance of CountThread */ <YSg~T
public CountControl() {} ,.q8Xf
public synchronized void executeUpdate(){ [Q=4P*G}X
Connection conn=null; m"q/,}DR
PreparedStatement ps=null; }eI`Qg
try{ CCn/ udp@
conn = DBUtils.getConnection(); lf;~5/%wMG
conn.setAutoCommit(false); b<8q 92F
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); >07shNX
for(int i=0;i<CountCache.list.size();i++){ >waN;&>/
CountBean cb=(CountBean)CountCache.list.getFirst(); k5g@myb-
CountCache.list.removeFirst(); .h a`)@MsZ
ps.setInt(1, cb.getCountId()); ;i}i5yv2
ps.executeUpdate();⑴ ^YqbjL
//ps.addBatch();⑵ %db3f
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} <qr^Nyo4
//int [] counts = ps.executeBatch();⑶ ,Z?m`cx
conn.commit(); #[Z<