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zrq — Wed, 18 Jun 2008 21:54:00 GMT

最�q�研�I�了几个ERP,CRM的��?象Sales force, Compeire, sugarCRM�Q�觉得SAAS�q�_��无非需要提供以下可以高度定制的功能�?br />

CSS
resources
menu/link
message i18n
form
GUI EventListener

Business Object

business logic or call back
email
report charts
job scheduler
business rule
work flow
access control
asynchronous request.

Database

我觉得这里面最隄��应属GUI的高度可定制化。本人正在想用GWT来做一个基于上面想法的SASS�q�_��Q�届时��Y件可真正实现快速按需打造。欢�q�JAVA界的同仁多提宝贵��?br />

zrq 2008-06-19 05:54 发表评论

sql statement

zrq — Fri, 07 Sep 2007 18:50:00 GMT

Select obj
from CommDeductionType obj
where 1=1
#if($obj)
and obj.deductionTypeCode = #{obj.deductionTypeCode}
#end

zrq 2007-09-08 02:50 发表评论

Open laszlo

zrq — Thu, 26 Jul 2007 19:18:00 GMT

Datapointers are not bound to views like datapaths are, but they do have a place in the view hierarchy—that is, they "know about" parents and children.

1
2 <datapointer xpath="myData:/" ondata="processData()">
3     <method name="processData">
4       this.selectChild(2);
5       do {
6         if (this.xpathQuery( '@show' ) == 'south park') {
7             Debug.write(this.xpathQuery('firstName/text()'));
8         }
9       } while (this.selectNext());
10     method>
11   datapointer>
12
13

Create data set at runtime

LzDataset: var dset = new LzDataset(null, {name: 'mydset'})

$path{} limitations
A limitation of the $path{} constraint is that the expression it contains is evaluated only at the initialization time, that is, an expression such as $path{'mynode[' + i + ']/@attr'} will behave like a $once{} constraint.Custome

Customize the data binding

1 <view name="swatch" width="200" height="30"
2   datapath="colors:/value[1]/text()">
3     <method name="applyData" args="v">
4       setBGColor(eval(v))
5       display.setText(v)
6     method>
7   view>

$path{}

datapath.setdatapointer

zrq 2007-07-27 03:18 发表评论

zrq — Sun, 13 Aug 2006 01:35:00 GMT

動態�i�裝SQL是實際應用中的一個常見問��?我發珑֜�很多論壇中的解決�Ҏ(gu��)��都不�q�淨,下面是我在很多項目中使用的方�?��洁有效.

基本概念如下:

1. 使用模板技�?如Velocity,FreeMarker;
2. 在SQL中不要��?,使用自己的place holder ,such as #{variableName};

象下面的SQL語句
select firstName
,lastName
from users u
where u.userId= #{userId}

#if($companyId)
and u.companyId=#{companyId}
#end

處理過程如下:

1.��所有變量放進一個MAP�?
2.用VELOCITY進行MERGE,��得��C��下的SQL,假定companyId 不為�I?
select firstName
,lastName
from users u
where u.userId= #{userId}
and u.companyId=#{companyId}
3.再將上面的SQL進一步處�?�Ҏ(gu��)��SQL語句中的placeHolder順序和MAP中的變量,生成一個變量的LIST,同時��變量的placeHolder轉換�?;
4.��變量LIST的數��g��ơ注入到preparedStatement�?span style="">;

Tips: 這里還可生成一個完全可埯��?/span> SQL 語句輸出�?/span> LOG �?/span> , 以便進行除錯;
5.埯��SQL, �?/span>reflection技術將ResultSet轉換�?/span>voList;

��上面的過程��裝成一�?/span> Class , 只需��?/span> sqlName,parameterMap,voClass 傛_��便可�q�回一�?/span> voList 或數�i?/span> . 此舉��大大減�?/span> DAO 的代��?/span> , �Ҏ(gu��)��我的�E�驗 , 代碼最��L(f��ng)��減少 70%, 更為重要的是查詢非常�Ҏ(gu��)��E�護 , 極大地減��了出錯的概�?/span> ,SQL 語句清晰易懂 , 不再是醜陋的 criteria, 也不再是��一個個的分散�?/span> SQL 片斷 , 我們的�E�序員將會有更多的時間來�?/span> SQL, 而不是做其它讓�h厭煩的工�?/span> , 排錯也變得异常簡�?/span> , 唯一可能出錯的地方只能在 SQL �?/span> , 只要��?/span> LOG 輸出的完整可埯�� SQL 攑֜� database client 中執行一�?/span> , 問題在哪�?/span> , 一目了�?/span> .

我相信此�Ҏ(gu��)�� 比�v iBatis, Spring �?/span> jdbcTemplate,Hibernate �?/span> Criteria 要容易��用得�?/span> . 其實 Hibernate �?/span> HQL, 也可以用此方法來動態生成 HQL.

zrq 2006-08-13 09:35 发表评论