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C++'s true and false

ljwiie — Fri, 21 May 2010 16:23:00 GMT

for a C++ program converts true and false to 1 and 0 where integer values are expected, and it converts 0 to false and nonzero to true where bool values are expected.

ljwiie 2010-05-22 00:23 发表评论

ECMAScript �l�承机制实现

ljwiie — Thu, 06 May 2010 15:57:00 GMT

用构造函数定义属性，用原型定义方�?br /> function ClassA(sColor) {
    this.color = sColor;
}

ClassA.prototype.sayColor = function () {
    alert(this.color);
};

function ClassB(sColor, sName) {

ClassA.call(this, sColor);

this.name = sName;
}

ClassB.prototype = new ClassA();

ClassB.prototype.sayName = function () {
alert(this.name);
};
在此例子中，�l�承机制�׃��行突出显�C�的蓝色代码实现。在�W�一行突出显�C�的代码中，�?ClassB 构造函��C��Q�用对象冒充�l�承 ClassA �cȝ�� sColor 属性。在�W�二行突出显�C�的代码中，用原型链�l�承 ClassA �cȝ��Ҏ��。由于这�U��؜合方式��用了原型链，所�?instanceof �q�算�W�仍能正��运行�?br />

下面的例子测试了�q�段代码�Q?br /> var objA = new ClassA("blue");
var objB = new ClassB("red", "John");
objA.sayColor(); //输出 "blue"
objB.sayColor(); //输出 "red"
objB.sayName(); //输出 "John"

摘自http://www.w3school.com.cn/js/pro_js_inheritance_implementing.asp

ljwiie 2010-05-06 23:57 发表评论

SqlServer中的case

ljwiie — Thu, 11 Jan 2007 02:26:00 GMT

做个查询�Q�字�D?值除3�Q�如�?1�Q�就用字�D?�?20�Q�如�?2�Q�字�D? �?30�Q�将差值大�?的数据选出来�?

SELECT col1, col2,
CASE
   WHEN col1 / 3 = 1 THEN col2 - 20
   WHEN col1 / 3 = 2 THEN col2 - 30
END AS difference
FROM price
WHERE (
CASE
   WHEN col1 / 3 = 1 THEN col2 - 20
   WHEN col1 / 3 = 2 THEN col2 - 30
END > 0)

ljwiie 2007-01-11 10:26 发表评论

�cȝ��l�承

ljwiie — Tue, 19 Dec 2006 15:00:00 GMT

...

ljwiie 2006-12-19 23:00 发表评论

JSP中page指��oisThreadSafe

ljwiie — Mon, 18 Dec 2006 09:39:00 GMT

<%@ page isThreadSafe="true|false" %>
默认��gؓtrue

isThreadSafe=false模式表示它是以Singleton模式�q�行�?br />     该模式implements了接口SingleThreadMode,
     该模式同一时刻只有一个实例，不会出现信息同步与否的概��c�?br />     若多个用户同时访问一个这�U�模式的��面�Q?br />     那么先访问者完全执行完该页面后�Q�后讉K��者才开始执行�?br />
isThreadSafe=true模式表示它以多线�E�方式运行�?br />    该模式的信息同步�Q�需讉K��同步�Ҏ��(用synchronized标记�?来实现�?br />    一般格式如下：
    public synchronized void syncmethod(...){
      if(...) {
         wait();
      }
      notifyAll();
    }

ljwiie 2006-12-18 17:39 发表评论

子窗口刷新父�H�口

ljwiie — Wed, 13 Dec 2006 04:28:00 GMT

1.
      parent.window.location.reload();

2. window.open( [sURL] [, sName] [, sFeatures] [, bReplace])
      window.opener.location.reload();

3. window.showModalDialog(sURL [, vArguments] [, sFeatures])
      vArguments �?window表示�Q�代表该window对象
      window.dialogArguments.location.reload();

ljwiie 2006-12-13 12:28 发表评论

Java中类的初始化��序

ljwiie — Sun, 10 Dec 2006 03:30:00 GMT

当子�cȝ��承了父类之后�Q�之�c�d��始化��序如下�Q?/p>

1.父类static变量�Q�或�E�序�?br />2.子类static变量�Q�或�E�序�?br />3.父类成员变量
4.父类构造函�?br />5.子类成员变量
6.子类构造函�?/p>

ljwiie 2006-12-10 11:30 发表评论

ljwiie — Sun, 03 Dec 2006 15:27:00 GMT

��d��的今天我��C��我的�W�一块滑板，boiling 2005�ƾ�?img src ="http://www.aygfsteel.com/ljwiie/aggbug/85236.html" width = "1" height = "1" />

ljwiie 2006-12-03 23:27 发表评论

oracle里面的round和java里面的round有何区别

ljwiie — Thu, 26 Oct 2006 02:08:00 GMT

oracle里面round为四舍五入，�l�对值四舍五入后加符�?/p>

java里面�?br />Math.round(a): (long)Math.floor(a + 0.5d)
Math.floor(a): 不大于a的最大整�?/p>

ljwiie 2006-10-26 10:08 发表评论

ljwiie — Tue, 24 Oct 2006 02:36:00 GMT

--商品��h��信息�?br />create table GOODS(
ID NUMBER,
NAME VARCHAR2(10),
PRICE NUMBER(10,2),
AREA VARCHAR2(10)
);
--��d��主键
alter table GOODS
add constraint PK_GOODS primary key (ID);
--��d��注视
comment on table GOODS is '商品信息�?;
comment on column GOODS.ID is '商品�~�号';
comment on column GOODS.NAME is '商品名称';
comment on column GOODS.PRICE is '商品��h��';
comment on column GOODS.AREA is '销售地�?;

--��d��数据
insert into GOODS values(11,'�Ҏ��','2.5','成都1');
insert into GOODS values(12,'�Ҏ��','3.5','成都2');
insert into GOODS values(13,'�Ҏ��','1.5','成都3');
insert into GOODS values(14,'�Ҏ��','2.0','成都4');

insert into GOODS values(21,'香蕉','1.7','成都1');
insert into GOODS values(22,'香蕉','1.5','成都2');
insert into GOODS values(23,'香蕉','1.6','成都3');
insert into GOODS values(24,'香蕉','2.0','成都4');

--查询某种商品�q�_��?br />select NAME,avg(PRICE) from GOODS group by NAME;

--��商品�h格更��Cؓ同种商品�Q�名�U�相同）的��^均�h�?br />update GOODS A
set A.PRICE =
(
select avg(PRICE) from GOODS where NAME = A.NAME
);

--执行环境oracle

ljwiie 2006-10-24 10:36 发表评论