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: @d|]BqQ4jh
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CountBean.java RC!T1o~L
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/* XLm@, A[
* CountData.java u7-0?
* 5jTA6s9z A
* Created on 2007年1月1日, 下午4:44 3>z+3!I z
* uW,rmd
* To change this template, choose Tools | Options and locate the template under @!(V0 -
* the Source Creation and Management node. Right-click the template and choose J^Wqa$<;"
* Open. You can then make changes to the template in the Source Editor. OW8TiM
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*/ ; d}
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package com.tot.count; hiaTJE|J?
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/** ;=8@@9
* &<C&(g{Z
* @author =[Tf9uQY
*/ >*}m.'u
public class CountBean { k59.O~0V
private String countType; o2LUB)=R'
int countId; `=8G?3
/** Creates a new instance of CountData */ U9R pHh`
public CountBean() {} ~ o5h}OU"
public void setCountType(String countTypes){ `]<~lf
this.countType=countTypes; );^{;fLy%
} ralU9MN.
public void setCountId(int countIds){ hPUYq7B
this.countId=countIds; 3[To"You
} KYFkO~N
public String getCountType(){ ~I%JVX%
return countType; P"c7h7
} H3S u'3
public int getCountId(){ p*=9Ea:
return countId; a#,lf9M
} Js!Zk\O
} 6EG`0h6
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CountCache.java q5~fU$ ,
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/* jyjK~!0
* CountCache.java h,'m*@Eg
* }sGH}n<9*
* Created on 2007年1月1日, 下午5:01 hC2Ra "te)
* =+wkjTO
* To change this template, choose Tools | Options and locate the template under p5=VGKp
* the Source Creation and Management node. Right-click the template and choose eadY(-4|I-
* Open. You can then make changes to the template in the Source Editor. 'gz@UE1
*/ @nF#\
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package com.tot.count; ]F,v#6qi
import java.util.*; Ea3 4x
/** U^$l$"~"
* %5?0+~
* @author [2ZZPY9?Q
*/ HLDg_ On8
public class CountCache { ekuRGG
public static LinkedList list=new LinkedList(); `
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/** Creates a new instance of CountCache */ wmgKh)`@_{
public CountCache() {}
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public static void add(CountBean cb){ 5nG$6Hw
if(cb!=null){ %g%#=a;]q
list.add(cb); 9=;ETLL "
} @Tf5YZ*
} XZ&q5]PJI
} {2%@I~US
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CountControl.java [a1}r=6~
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/* oNr~8CA`
* CountThread.java 0@8EIQxK"
* _}wy|T&7k&
* Created on 2007年1月1日, 下午4:57 4 5\%2un
* _&6&sp<n
* To change this template, choose Tools | Options and locate the template under d[I}+%{[
* the Source Creation and Management node. Right-click the template and choose BM]sW:-v
* Open. You can then make changes to the template in the Source Editor. %y;Cgo[
*/ F>A&L8
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package com.tot.count; pUaGrdGxzQ
import tot.db.DBUtils; N{6Lvq[8
import java.sql.*; Y>[u(q&09O
/** H?axlRmw3
* ^ $t7p
1
* @author `;!v<@:i2
*/ QK%6Ncv
public class CountControl{ <CUe"WbE)
private static long lastExecuteTime=0;//上次更新时间 #x|h@(y|
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 ~ugK&0i[2
/** Creates a new instance of CountThread */ efF>kcIC
public CountControl() {} Y r^C+Oyg
public synchronized void executeUpdate(){ NbnuQPb'
Connection conn=null; 9rsty{J8
PreparedStatement ps=null; h $}&N
try{ `$D2w|
conn = DBUtils.getConnection(); X6]eQ PN2
conn.setAutoCommit(false); gyW##M@{
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 2@S{e$YK`
for(int i=0;i<CountCache.list.size();i++){
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CountBean cb=(CountBean)CountCache.list.getFirst(); CCZ]`*wJ
CountCache.list.removeFirst(); za20Y?)[
ps.setInt(1, cb.getCountId()); we&g9j'
ps.executeUpdate();⑴ ,kKMUshBi
//ps.addBatch();⑵ |JW-P`tL0
} 3M{/9rR[
//int [] counts = ps.executeBatch();⑶ }
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conn.commit(); 0SBiMTm
}catch(Exception e){ g^DPbpWxu
e.printStackTrace(); T6ajWUw
} finally{ "!6 Ax-'
try{ 4#m"t?6!
if(ps!=null) { vxzOG?Xc:
ps.clearParameters(); \^+=vO;A
ps.close(); )5U&^tJ
ps=null; Dh|8$(Jt
} N8|
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}catch(SQLException e){} v/BMzVi
DBUtils.closeConnection(conn); w|>O!]K]
} &dkj