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: 9yTdbpY
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CountBean.java Z ;rM@x
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/* O@@nGSc@
* CountData.java $Xt""mlQ
* pJ8F+`*
* Created on 2007年1月1日, 下午4:44 ~
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* b`+yNf
* To change this template, choose Tools | Options and locate the template under t^MTR6y+8
* the Source Creation and Management node. Right-click the template and choose vd#)+
* Open. You can then make changes to the template in the Source Editor. bi}aVtG~z
*/ HRE?uBkjf
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package com.tot.count; SW}Rkr\e
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/** `]l`t"x
* TC<Rg?&yb
* @author }U'9 d#N
*/ ?`xF>P]M
public class CountBean { C=oeRc'r1W
private String countType; 8vq-|p
int countId; #J/RI[a
/** Creates a new instance of CountData */ FYFlh^}
public CountBean() {} V Zbn@1
public void setCountType(String countTypes){ *ilVkV"U
this.countType=countTypes; L9e<hRZ$
} |$IL:W6
public void setCountId(int countIds){ `-U?{U}H
this.countId=countIds; UmpHae
} bR~Xog
public String getCountType(){ om`B:=+
return countType; T$0)un
} b7^q(}qE
public int getCountId(){ HP*{1Q@5
return countId; xPm{'J+b~
} :!t4.ko
} :D3:`P>,c
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CountCache.java ]pB5cq7o
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/* 4KxuSI^q
* CountCache.java T.z efoZ
* dKEy6C"@
* Created on 2007年1月1日, 下午5:01 _oa*E2VN
* a3M I+
* To change this template, choose Tools | Options and locate the template under Q'^'G>MBJ
* the Source Creation and Management node. Right-click the template and choose >3b<
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* Open. You can then make changes to the template in the Source Editor. #'f5owk>,
*/
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package com.tot.count; !!ZGNZ_
import java.util.*; ]vR
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/** 8*?H~q~
* U:7w8$_
* @author k
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*/ ,ko#z}Z4r,
public class CountCache { $;=^|I4E
public static LinkedList list=new LinkedList(); y[Dgyt
/** Creates a new instance of CountCache */ _&gO>G,uy
public CountCache() {} $tW E9_
public static void add(CountBean cb){ %/\sn<6C}
if(cb!=null){ }+`,AC`RM
list.add(cb); c^H#[<6p
} +|GHbwvp
} CaED(0
} o@
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CountControl.java Y
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/* 8f~*T
* CountThread.java )D+eWo
* 9+ve0P7$
* Created on 2007年1月1日, 下午4:57 U. <c#S
* s H'FqV,)
* To change this template, choose Tools | Options and locate the template under _(=g[=Mer
* the Source Creation and Management node. Right-click the template and choose 46l*ui_
* Open. You can then make changes to the template in the Source Editor. JY:Fu
*/ BUi,+NdIk
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package com.tot.count; peS4<MqWu
import tot.db.DBUtils; `;R$Ji=>
import java.sql.*; lxD~l#)^ln
/** t=:5?}J.Q$
* `T%nGV l>\
* @author -`spu)
*/ K",Xe>
public class CountControl{ d"3x11|
private static long lastExecuteTime=0;//上次更新时间 `\ nKPj
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 :*l\j"fX5
/** Creates a new instance of CountThread */ cZ`%Gt6g
public CountControl() {} .
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public synchronized void executeUpdate(){ P()&?C
Connection conn=null; (Cti,g~
PreparedStatement ps=null; a|dgK+[
try{ h{~GzrL*
conn = DBUtils.getConnection(); vgNrHq&2q
conn.setAutoCommit(false); ?u{Mz9:?HT
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); wB[
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for(int i=0;i<CountCache.list.size();i++){ ]d|M@v~c4
CountBean cb=(CountBean)CountCache.list.getFirst(); @YS,)U)4S
CountCache.list.removeFirst(); NDe FY
ps.setInt(1, cb.getCountId()); IY}GU 2#
ps.executeUpdate();⑴ j\BtaC
//ps.addBatch();⑵ TEK#AR
} Mg^A,8lrm
//int [] counts = ps.executeBatch();⑶ ^h`rA"F\
conn.commit(); 7D8 pb0`;J
}catch(Exception e){ Vd)
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e.printStackTrace(); yRhD<