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: dIK{MA
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CountBean.java ?Y!U*& 7
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/* jT"r$""1d
* CountData.java 9qeZb%r&
* {W'8T}q
* Created on 2007年1月1日, 下午4:44 4I.1D2 1jA
* o_:Qk;t
* To change this template, choose Tools | Options and locate the template under ,|x\MHd?t_
* the Source Creation and Management node. Right-click the template and choose Hd*Fc=>"Y
* Open. You can then make changes to the template in the Source Editor. #O6
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*/ nhT;b,G.Z
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package com.tot.count; T:n<db,Px
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/** 5\?3$<1I
* :tlE`BIp
* @author G:hU{S7
*/ B$DZ]/<
public class CountBean { x.G"D(
private String countType; [edH%S}\
int countId; GMTor
/** Creates a new instance of CountData */ :s-EG;.
public CountBean() {} ~%KM3Vap
public void setCountType(String countTypes){ iRouLd
this.countType=countTypes; @4@PuWI0-
} l<n5gfJ
public void setCountId(int countIds){ NJ>,'s
this.countId=countIds; Rj&qh`
} pzAoq)gg:
public String getCountType(){ A8mlw#`E8b
return countType; 'FqEB]gu
} BP:(IP!&
public int getCountId(){ qdO[d|d
return countId; 1h{>[ 'L
} BMY>a
} 'hy?jQ'|e
}!=gP.Zu^
CountCache.java hXPocP
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/* S$\.4*_H\
* CountCache.java _o&94&
* 7Zo&+
* Created on 2007年1月1日, 下午5:01 ">4PePt.n
* /Ht/F)&P
* To change this template, choose Tools | Options and locate the template under :b<KX%g
* the Source Creation and Management node. Right-click the template and choose q;ZLaX\bFl
* Open. You can then make changes to the template in the Source Editor. U>in2u9
*/ ZWFG?8lJ
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package com.tot.count; YsZ{1W
import java.util.*; i,([YsRuou
/** }'DC
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* fEB195#@9
* @author wKGogf[(%
*/ {s,^b|I2#U
public class CountCache { TNJ<!6
public static LinkedList list=new LinkedList(); B>sCP"/uV
/** Creates a new instance of CountCache */ ob)Q,;8R
public CountCache() {} Q!YF!WoBX
public static void add(CountBean cb){ L+8=P<]
if(cb!=null){ Hw\([j*
list.add(cb); ]7v81G5E
} ) @!~8<_"
} m5)EQE}gPp
} |3S'8OeCI
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CountControl.java K*HCFqrU"
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/* a#^_"GX
* CountThread.java nDyvX1]
* XpR.rq$]
* Created on 2007年1月1日, 下午4:57 r|l53I5
* @55bE\E?@
* To change this template, choose Tools | Options and locate the template under `E{;85bDH
* the Source Creation and Management node. Right-click the template and choose "fRlEO[9
* Open. You can then make changes to the template in the Source Editor. Lwp-2`%
*/ 5woIGO3X
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package com.tot.count; `@4 2jG}*
import tot.db.DBUtils; EfFj!)fz
import java.sql.*; `oB' (
/** FTbT9
* mG>T`c|r3
* @author $/NGNkl[
*/ kSLSxfR
public class CountControl{ I h5/=_n
private static long lastExecuteTime=0;//上次更新时间 P=f<#l"v
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Qe7"Z
/** Creates a new instance of CountThread */ -;l`hRW
public CountControl() {} +F1]M2p]
public synchronized void executeUpdate(){ 'u4}t5Bu5
Connection conn=null; <FXQxM5"
PreparedStatement ps=null; ;~}-AI-
try{ H%*~l
conn = DBUtils.getConnection(); 7'-)/Pk
conn.setAutoCommit(false); 29R_n)ne
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); `Mo~EHso.
for(int i=0;i<CountCache.list.size();i++){ D
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CountBean cb=(CountBean)CountCache.list.getFirst();
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CountCache.list.removeFirst(); nvU+XCx
ps.setInt(1, cb.getCountId()); DH}s1mNMP
ps.executeUpdate();⑴ &@mvw=d
//ps.addBatch();⑵ 1.hOE>A%
} /AK*aRU^
//int [] counts = ps.executeBatch();⑶ k$9Gn9L%
conn.commit(); OU0xZ=G
}catch(Exception e){ 0!3!?E <
e.printStackTrace(); Jm{As*W>
} finally{ RM?_15m
try{ p[ks} mca@
if(ps!=null) { 8.Pcr<