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: JA2oy09G
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CountBean.java D5"Xjo*
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/* m(KBg'kQ
* CountData.java w\lc;4U
* \N[2-;[3
* Created on 2007年1月1日, 下午4:44 >J) 9&?
* Uu[dx}y
* To change this template, choose Tools | Options and locate the template under \5P 5N]]
* the Source Creation and Management node. Right-click the template and choose x T1MW
* Open. You can then make changes to the template in the Source Editor. X4CiVV
*/ j.kv!;Rj=
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package com.tot.count; k7kPeq
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/** 3g87i r
* a[=;6!
* @author }fZ~HqS2w
*/ P!u0_6
public class CountBean { g&r3;
private String countType; K^e4w`F|
int countId; ~FnuO!C
/** Creates a new instance of CountData */ IC:>60A,]
public CountBean() {} uNf97*~_
public void setCountType(String countTypes){ e7r3o,!
this.countType=countTypes; 9c{T|+]
} 5;@2SY7,
public void setCountId(int countIds){ js;k,`
this.countId=countIds;
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} 6%Pvh- ~_
public String getCountType(){ Hq
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return countType; Ij2Th]
} a"m-&mN
public int getCountId(){ ]jSRO30H3<
return countId; j~Mx^ivwj
} *:?XbtIK u
} `_e5pW=:>
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CountCache.java wGgeK,*_
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/* z:oi@q
* CountCache.java n{(,r'
* #'4Psz
* Created on 2007年1月1日, 下午5:01 !.{"Ttn;s
* 7QdboEa
* To change this template, choose Tools | Options and locate the template under _'Rg7zHTp-
* the Source Creation and Management node. Right-click the template and choose -ND1+`yD
* Open. You can then make changes to the template in the Source Editor. !@>q^_Gez
*/ nCDG PzJ
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package com.tot.count; J\hqK*/8
import java.util.*; Ze?n Q-
/** ?{%"v\w
* 'HJ<"<
* @author 0IyT(1hS
*/ 3QCCX$,
public class CountCache { qOflvf
public static LinkedList list=new LinkedList(); S2
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/** Creates a new instance of CountCache */ Uf9L*Z'6il
public CountCache() {} '.]<lh!
public static void add(CountBean cb){ {g 4`>^;
if(cb!=null){ 9B/iQCFtj$
list.add(cb); -s^)HR
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} 45H9pY w
} Y/T-2)D
}
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CountControl.java S^iT&;,
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/* QBd4ok:R
* CountThread.java YB.@zL0.(
* a5 pXn v]A
* Created on 2007年1月1日, 下午4:57 gF:|j(
* qq"0X! w
* To change this template, choose Tools | Options and locate the template under =1\mLI}@
* the Source Creation and Management node. Right-click the template and choose 0|ekwTx.
* Open. You can then make changes to the template in the Source Editor. {E.A?yej9
*/ B:ugEAo_
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package com.tot.count; #'y&M t
import tot.db.DBUtils; ul]hvK{2
import java.sql.*; Bh7hF?c Sj
/** ccT
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* y"k%Wa`*
* @author yIg^iZD
*/ G +AP."M?
public class CountControl{ 4m6/ba
private static long lastExecuteTime=0;//上次更新时间 =s9*=5r 8
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 sF3@7~m4
/** Creates a new instance of CountThread */ e.W <pI,
public CountControl() {} ,[<$X{9
public synchronized void executeUpdate(){ thz[h5C?C
Connection conn=null; QZJnb%]
PreparedStatement ps=null; O*%5P5'p"{
try{ izu_1X
conn = DBUtils.getConnection(); rdsZ[ii
conn.setAutoCommit(false); @sUec
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); v6ei47-
for(int i=0;i<CountCache.list.size();i++){ n<1*cL:8B
CountBean cb=(CountBean)CountCache.list.getFirst(); :3{n(~
CountCache.list.removeFirst(); F`1J&S;C
ps.setInt(1, cb.getCountId()); 39L_O RMH
ps.executeUpdate();⑴ o5:md :\
//ps.addBatch();⑵ @|{8/sOq
} S0ltj8t
//int [] counts = ps.executeBatch();⑶ :KqSMuKR
conn.commit(); <sSH^J4QqX
}catch(Exception e){
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e.printStackTrace(); FiSx"o
} finally{ &?5me:aU
try{ Mkr
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if(ps!=null) { aq\Fh7
ps.clearParameters(); ibLx'<
ps.close(); |.;]e[&
ps=null; H;0K4|I
} KwgFh#e
}catch(SQLException e){} ([#'G+MC&