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}9PEpa,Z
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CountBean.java XoH[MJC
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/* 0?5%
* CountData.java Fl#VKU3h
* ERX|cc
* Created on 2007年1月1日, 下午4:44 !5E%W[
* 'sjJSc
* To change this template, choose Tools | Options and locate the template under =7J|KoKK
* the Source Creation and Management node. Right-click the template and choose :C|>y4U&(s
* Open. You can then make changes to the template in the Source Editor. g'}`FvADi
*/ u]]5p[|S
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package com.tot.count; y3@x*_K8
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/** A&}nRP9
* r0?hX
* @author p~d)2TC4#
*/ }VGI Y>v
public class CountBean { vS J<
private String countType; Z68Wf5@to&
int countId; 9
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/** Creates a new instance of CountData */ :,}:c%-^"
public CountBean() {} nuQLq^e
public void setCountType(String countTypes){ _#^A:a^e8
this.countType=countTypes;
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} FSYjp{z5
public void setCountId(int countIds){ @]ptY*
this.countId=countIds; %<ptkZK#
} ^7s6J{<
public String getCountType(){ :#W>SO
return countType; H s4zJk
} P^_d$
public int getCountId(){ r"u(!~R
return countId; 'Qs3
} %:be{Y6
} RZ/+K=
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CountCache.java C5s N[
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/* >;' 1k'
* CountCache.java ;@ll
* m)[wZP*e
* Created on 2007年1月1日, 下午5:01 h@>rjeY@
* 5rHnU<H@y
* To change this template, choose Tools | Options and locate the template under /nMqEHCyg
* the Source Creation and Management node. Right-click the template and choose '/yx_RK2?
* Open. You can then make changes to the template in the Source Editor. $Op/5j
*/ {^$"/hj
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package com.tot.count; WEV{C(u<k!
import java.util.*; K}5$;W#
/** A]SB c2
* !7NzW7j
* @author xBI"{nGoN
*/ E~Up\f
public class CountCache { aIt
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public static LinkedList list=new LinkedList(); "za*$DU
/** Creates a new instance of CountCache */ k0e|8g X
public CountCache() {} #Mem2cz
public static void add(CountBean cb){ 1:{O RX[;
if(cb!=null){ jXDzjt94J
list.add(cb); zk 'e6
} 7dg
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} n xh/&%
} G`9F.T_Z^)
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CountControl.java seD+~Y\z
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/* z`r4edk3
* CountThread.java .&yWHdQC:
* (27F
* Created on 2007年1月1日, 下午4:57 VY&9kN
* 85@6uBh
* To change this template, choose Tools | Options and locate the template under 8DS5<
* the Source Creation and Management node. Right-click the template and choose knK=ENf;e
* Open. You can then make changes to the template in the Source Editor. ;'18
*/ 1\608~ZH
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package com.tot.count; "6NNId|Y
import tot.db.DBUtils; M"$RtS|h
import java.sql.*; ]MA)='~
/** bQN4ozSi
* by
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* @author sImxa`kb
*/ J0WXH/:
public class CountControl{ A[$wxdc
private static long lastExecuteTime=0;//上次更新时间 C^42=?
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 /h.3<HI."*
/** Creates a new instance of CountThread */ VX>t!JP p
public CountControl() {} Z%n.:I<%ZV
public synchronized void executeUpdate(){ D>x'3WYR
Connection conn=null; LYq2A,wm$
PreparedStatement ps=null; (PrPH/$
try{ <ZvPtW
conn = DBUtils.getConnection(); V_d%g<n4
conn.setAutoCommit(false); UCj#t!Mw
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); Dp6"I!L<|
for(int i=0;i<CountCache.list.size();i++){ 5~R{,]52
CountBean cb=(CountBean)CountCache.list.getFirst(); S| -{wC%
CountCache.list.removeFirst(); w>q_8V_K
ps.setInt(1, cb.getCountId()); ]aW.b_7<9
ps.executeUpdate();⑴ [MXXY
//ps.addBatch();⑵ w*ktx{
} &fy8,}
//int [] counts = ps.executeBatch();⑶ x2&