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: /tC9G@Hl
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CountBean.java h}6_ybmZ
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/* j%xBo:
* CountData.java P;GprJ`l
* 6VR[)T%
* Created on 2007年1月1日, 下午4:44 dU+0dZdKO
* $
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* To change this template, choose Tools | Options and locate the template under Gpu_=9vzv
* the Source Creation and Management node. Right-click the template and choose {j@+h%sF>+
* Open. You can then make changes to the template in the Source Editor. (,tHL
*/ Phlk1*1n
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package com.tot.count; # #>a&,
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/** !%62Phai
* BE4\U_]a3
* @author 3^ ~Zj95M
*/ I9/KM4&
public class CountBean { {PmzkT}LF
private String countType; taV|YP$
int countId; gz\j('~-D
/** Creates a new instance of CountData */ ,.7vBt6 p
public CountBean() {} M,G8*HI"
public void setCountType(String countTypes){ g RU-g
this.countType=countTypes; ua:9`+Dff
} ,v_B)a_E
public void setCountId(int countIds){ L9J;8+ge
this.countId=countIds; 8bGD
} j4vB`Gr]
public String getCountType(){ i-"<[*ePd
return countType; *h])mqhB
} hU+#S(t>b
public int getCountId(){ 24O
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return countId; ZIy(<0
} `D"1
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} s
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CountCache.java pLo;#e8'f
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/* N.vG]%1"
* CountCache.java ZmP1C`>
* x{j+}'9
* Created on 2007年1月1日, 下午5:01 :SdIU36
* -G!6U2*#
* To change this template, choose Tools | Options and locate the template under pKYLAt+^>
* the Source Creation and Management node. Right-click the template and choose BiE$mM
* Open. You can then make changes to the template in the Source Editor. *Ji9%IA
*/ 8nf4Jk8r
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package com.tot.count; Ga?UHw~
import java.util.*; Es:5yX!
/** "V:XhBG?
* 63SVIc~wT
* @author n }TTq6B
*/ KG-UW
public class CountCache { yq!CWXZ2
public static LinkedList list=new LinkedList(); W*3o|x
/** Creates a new instance of CountCache */ qjzZ}
public CountCache() {} ,A^L=+
public static void add(CountBean cb){ j}"]s/= 6
if(cb!=null){ % hNn%Oy:E
list.add(cb); :nt}7Dn'
} G1A$PR
} 01-p
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} 2"zI R(
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CountControl.java xL|?(pQ/BK
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/* $`ON!,oa
* CountThread.java CCC4(v
* 3SmqXPOw
* Created on 2007年1月1日, 下午4:57 3HXh6( e
* {6ajsy5=
* To change this template, choose Tools | Options and locate the template under F=:F>6`
* the Source Creation and Management node. Right-click the template and choose zj%cd;
* Open. You can then make changes to the template in the Source Editor. O^y$8OKEi,
*/ twAw01".
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package com.tot.count; TeOFAIU
import tot.db.DBUtils; X5|?/aR}
import java.sql.*; M_yZR^;^-
/** w6%l8+{R
* OX'/?B((
* @author 9Y;}JVS
*/ Ty)gPh6O
public class CountControl{ _.u~)Q`6
private static long lastExecuteTime=0;//上次更新时间 jY1^+y{
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 c>M_?::)0
/** Creates a new instance of CountThread */ R65;oJh
public CountControl() {} R9S7_u
public synchronized void executeUpdate(){ /M5=tW#e
Connection conn=null; Z?vY3)
PreparedStatement ps=null; >eTf}#s?S
try{ A;K{ &x
conn = DBUtils.getConnection(); Rh5@[cg%
conn.setAutoCommit(false); ZKVp[A
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); e&r+w!
for(int i=0;i<CountCache.list.size();i++){ PGC07U:B
CountBean cb=(CountBean)CountCache.list.getFirst(); 3 ATN?V@
CountCache.list.removeFirst(); {6REfY
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ps.setInt(1, cb.getCountId()); vbW\~xf
ps.executeUpdate();⑴ lsTe*Od
//ps.addBatch();⑵ cuJ/ Vc
} ={e#lC
//int [] counts = ps.executeBatch();⑶ 5|{ t+u
conn.commit(); &