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: ~F"w
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CountBean.java
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/* Z'~/=a)7
* CountData.java V}h
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* 5fq4[a
* Created on 2007年1月1日, 下午4:44 (M#m BS
* P"{yV?CNg
* To change this template, choose Tools | Options and locate the template under @$fvhEkrT@
* the Source Creation and Management node. Right-click the template and choose
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* Open. You can then make changes to the template in the Source Editor. <:>[24LJ{
*/ "_0sW3rG
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package com.tot.count; 7Hg;SK6t0
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/** ,`!>.E.
* R$x(3eyx
* @author kq*IC&y
*/ ;TKsAU
public class CountBean { ]+5Y\~I
private String countType; l0PXU)>C
int countId; 0DaKd<Scv
/** Creates a new instance of CountData */ =5O&4G`}
public CountBean() {} :z`L)
public void setCountType(String countTypes){ W0S\g#
this.countType=countTypes; XnKf<|j6k
} [:/mjO K
public void setCountId(int countIds){ ky{@*fg.
this.countId=countIds; =d$m@rc0r
} iU|X/>k?
public String getCountType(){ )TcD-Jr
return countType; ^7Ebg5<
}
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public int getCountId(){ J ql$
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return countId; 4}t$Lf_
} q}]z8 L
} iow"X6_l_
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CountCache.java 2;7n0LOs}
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/* zG7y$\A
* CountCache.java Iv{uk$^7S
* H on,-<
* Created on 2007年1月1日, 下午5:01 )&[ol9+\
* r.' cjUs
* To change this template, choose Tools | Options and locate the template under o,qUf
* the Source Creation and Management node. Right-click the template and choose O{Z
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* Open. You can then make changes to the template in the Source Editor. LYuMR,7E
*/ _6`H`zept
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package com.tot.count; *iUR1V Y
import java.util.*; ?s]?2>p
/** ^3C%&
* M1eM^m8U
* @author :m0pm@
*/ {
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public class CountCache { g6H` uO
public static LinkedList list=new LinkedList(); brdY97s4
/** Creates a new instance of CountCache */ n],"!>=+
public CountCache() {} 7Q|v5@;pU
public static void add(CountBean cb){ .X"\ Mg
if(cb!=null){ {A\y4D@
list.add(cb); pYj}
} gb26Y!7%
} '/fueku
} }0Fu
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CountControl.java A<-3u
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/* #Wt1Ph_;
* CountThread.java ~"cqFdnO
* $*7AG
* Created on 2007年1月1日, 下午4:57 ~,{nBp9*
* qdZo
cTf'
* To change this template, choose Tools | Options and locate the template under Z#@<|{eI
* the Source Creation and Management node. Right-click the template and choose %.s"l6 W
* Open. You can then make changes to the template in the Source Editor. 5ZjM:wrF|
*/ RCMO?CBe
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package com.tot.count; .WS 7gTw
import tot.db.DBUtils; 7Pr5`#x#
import java.sql.*; :+ AqY(Gz
/** ~Dj_N$_+9
* Lmc"qFzK
* @author tj: >o#D
*/ O*1la/~m
public class CountControl{ u:>*~$f
private static long lastExecuteTime=0;//上次更新时间 ?e hUGvV2
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 (y?`|=G-xT
/** Creates a new instance of CountThread */ wTn"
public CountControl() {} )C>M74Bt
public synchronized void executeUpdate(){ b\+9#)Up@
Connection conn=null; 41o~5:&
PreparedStatement ps=null; KRh?{
try{ rlkg.e6
conn = DBUtils.getConnection(); H?j}!JzAC
conn.setAutoCommit(false); -l$-\(,M`#
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); I_'0!@Nn7
for(int i=0;i<CountCache.list.size();i++){ jxZd
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CountBean cb=(CountBean)CountCache.list.getFirst(); }#E~XlX^
CountCache.list.removeFirst(); %loe8yt
ps.setInt(1, cb.getCountId()); \)BDl
ps.executeUpdate();⑴ !qJ|`o Y
//ps.addBatch();⑵ #po}Y
} 0GnbE2&
//int [] counts = ps.executeBatch();⑶ BoXGoFn
conn.commit(); Jek)`D
}catch(Exception e){ @W!cC#u
e.printStackTrace(); rY(^6[ !
} finally{ \E,Fe:/g
try{ yQ+C}8r5
if(ps!=null) { d<v)ovQJ]
ps.clearParameters(); 5OX5\#Ux
ps.close(); R^GLATM
ps=null; B1 [O9 U:
} G `JXi/#`
}catch(SQLException e){} 2_;3B4GDF
DBUtils.closeConnection(conn); .8Gmy07
} /qO?)p3gk
} M-NY&