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: A,A-5l<h]?
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CountBean.java OM#OPB
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/* UO7a}Tz<
* CountData.java Iu)(Huv
* =QO1FO
* Created on 2007年1月1日, 下午4:44 `)xU;-
* R*c0NJF
* To change this template, choose Tools | Options and locate the template under OD2ai]!v+
* the Source Creation and Management node. Right-click the template and choose bx%hizb
* Open. You can then make changes to the template in the Source Editor. vVvt
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*/ |]
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package com.tot.count; ;zxlwdfcr'
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/** =6 q*w^ET
* >8{`q!=|~
* @author D2wgSrY
*/ "Ee/q :`
public class CountBean { c`N`xU+z
private String countType; ]$`s}BN
int countId; {D_4~heF
/** Creates a new instance of CountData */ MjF.>4
public CountBean() {} R4J>M@-0v
public void setCountType(String countTypes){ C">=2OO
this.countType=countTypes; =-B3vd:LF
} Ot:\h
public void setCountId(int countIds){ ztxQv5=:,
this.countId=countIds; FlA$ G3
} VAB&&AL
public String getCountType(){ h"Yqm"U/
return countType; N#6A>
} xuH<=-O>ki
public int getCountId(){ gQcr'[[a
return countId; Qak@~b
} E'kQ
} z$im4'\c
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CountCache.java
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/* Q`wA"mw6k
* CountCache.java C?c -V,
* NB yN}e
* Created on 2007年1月1日, 下午5:01 g)G7
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* SO jDtZ
* To change this template, choose Tools | Options and locate the template under ~uD;_Y=u)r
* the Source Creation and Management node. Right-click the template and choose dvdBRrf
* Open. You can then make changes to the template in the Source Editor. DEeL48{R
*/
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package com.tot.count; QCY{D@7T
import java.util.*; !A<XqzV]
/** NS/L! "g
* nO7o7bc
* @author D+U/ ]sW
*/ y&I|m
public class CountCache { X52jqXjg
public static LinkedList list=new LinkedList(); 4lKbw4[a
/** Creates a new instance of CountCache */ Gw\HL
public CountCache() {} r.G/f{=<@
public static void add(CountBean cb){ KD3To%
if(cb!=null){ U;A5-|C
list.add(cb); {q>4:lsS
} b2@x(5#
} I4p= ?Ds
} _e@qv;*
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CountControl.java <rI$"=7
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/* }Knq9cf
* CountThread.java (uxQBy
* v{*X@)$
* Created on 2007年1月1日, 下午4:57 _ G*x:<
* ImY*cW=M
* To change this template, choose Tools | Options and locate the template under TF3q?0
* the Source Creation and Management node. Right-click the template and choose }8]uZ)[p=
* Open. You can then make changes to the template in the Source Editor. 5J#gJFA
*/ nv[Sb%/
,* vnt6C*
package com.tot.count; s3RyLT
import tot.db.DBUtils; '\mZ7.Jj
import java.sql.*; I; }%k;v6
/** "RX5] eJc\
* iOXP\:mPo
* @author $ u.T1v
*/ ovo I~k'
public class CountControl{ eii7pbc
private static long lastExecuteTime=0;//上次更新时间 RV*Zi\-X
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 PC7.+;1
/** Creates a new instance of CountThread */ )Ua2x@j'C@
public CountControl() {} 5GxM?%\
public synchronized void executeUpdate(){ 9wJmX<Rm
Connection conn=null; Bw7:ry
PreparedStatement ps=null; P87Fg
try{ e Em0c]]9
conn = DBUtils.getConnection(); qtQ:7WO
conn.setAutoCommit(false); r.5Js*VX!
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); Kj|F
for(int i=0;i<CountCache.list.size();i++){ %+"AF+c3r
CountBean cb=(CountBean)CountCache.list.getFirst(); \4X{\p<
CountCache.list.removeFirst(); TB[2!ZW
ps.setInt(1, cb.getCountId()); ?vNS!rY2&
ps.executeUpdate();⑴ ojqX#>0K
//ps.addBatch();⑵ #zD+DBTAu
} RtM.}wv;
//int [] counts = ps.executeBatch();⑶ !D5`8
conn.commit(); Elk$9 <<
}catch(Exception e){ BD+~8v
e.printStackTrace(); sU!q~`; J
} finally{ I}A#*iD
try{ |OT%,QT|
if(ps!=null) { ;mxT>|z
ps.clearParameters(); _[tBLGXD
ps.close(); _ILOA]ga#
ps=null; &