JDeveloper 11g

 

1.       ADF 实践<o:p></o:p>

<o:p> </o:p>

1.1.       简言

ADF实践__JDeveloper<st1:chmetcnv w:st="on" unitname="g" sourcevalue="10" hasspace="False" negative="False" numbertype="1" tcsc="0">10g</st1:chmetcnv>与JDeveloper<st1:chmetcnv w:st="on" unitname="g" sourcevalue="11" hasspace="False" negative="False" numbertype="1" tcsc="0">11g</st1:chmetcnv>

    日前,本人分别在JDeveloper<st1:chmetcnv w:st="on" unitname="g" sourcevalue="10" hasspace="False" negative="False" numbertype="1" tcsc="0">10g</st1:chmetcnv>和JDeveloper<st1:chmetcnv w:st="on" unitname="g" sourcevalue="11" hasspace="False" negative="False" numbertype="1" tcsc="0">11g</st1:chmetcnv>上做了个ADF数据库应用的小DEMO.感觉<st1:chmetcnv w:st="on" unitname="g" sourcevalue="10" hasspace="False" negative="False" numbertype="1" tcsc="0">10g</st1:chmetcnv>和<st1:chmetcnv w:st="on" unitname="g" sourcevalue="11" hasspace="False" negative="False" numbertype="1" tcsc="0">11g</st1:chmetcnv>存在着比较大的差异.首先: <st1:chmetcnv w:st="on" unitname="g" sourcevalue="11" hasspace="False" negative="False" numbertype="1" tcsc="0">11g</st1:chmetcnv>在原有功能上增加了对Ajax功能的支持,可以说功能更加强大,但在实际使用中,我觉得<st1:chmetcnv w:st="on" unitname="g" sourcevalue="10" hasspace="False" negative="False" numbertype="1" tcsc="0">10g</st1:chmetcnv>的使用性更好,更易于开发.或许是因为<st1:chmetcnv w:st="on" unitname="g" sourcevalue="11" hasspace="False" negative="False" numbertype="1" tcsc="0">11g</st1:chmetcnv>新增的功能吧,未能深入了解到.以下几点,是我在做此DEMO过程中遇到的问题.

<o:p> </o:p>

1.2.       <st1:chmetcnv w:st="on" unitname="g" sourcevalue="10" hasspace="False" negative="False" numbertype="1" tcsc="0">10g</st1:chmetcnv>与<st1:chmetcnv w:st="on" unitname="g" sourcevalue="11" hasspace="False" negative="False" numbertype="1" tcsc="0">11g</st1:chmetcnv>问题简要汇总

1.TopLink表关系影射生成POJO对象问题

USERS表结构:

CREATE TABLE USERS (

    USER_ID NUMBER(8,0) NOT NULL,

    USER_ROLE VARCHAR2(10) NOT NULL,

    EMAIL VARCHAR2(50) NOT NULL,

    FIRST_NAME VARCHAR2(30) NOT NULL,

    LAST_NAME VARCHAR2(30) NOT NULL,

    STREET_ADDRESS VARCHAR2(40) NOT NULL,

    CITY VARCHAR2(30) NOT NULL,

    STATE_PROVINCE VARCHAR2(25),

    POSTAL_CODE VARCHAR2(12),

    COUNTRY_ID CHAR(2)

    )

    NOLOGGING

    INITRANS 1

    MAXTRANS 255

    STORAGE (

        INITIAL 64K

        MINEXTENTS 1

        MAXEXTENTS 2147483645);

<o:p> </o:p>

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在JDeveloper <st1:chmetcnv w:st="on" unitname="g" sourcevalue="10" hasspace="False" negative="False" numbertype="1" tcsc="0">10g</st1:chmetcnv>中:

其通过TopLink可生成类Users.java

表字段:userId生成属性: private Integer userId;

而在JDeveloper <st1:chmetcnv w:st="on" unitname="g" sourcevalue="11" hasspace="False" negative="False" numbertype="1" tcsc="0">11g</st1:chmetcnv>中 :

竟然是: private BigDecimal userId;<o:p></o:p>

2.Create Object-Relational Map

我在用TopLink从数据表生成对象POJO时，

在<st1:chmetcnv w:st="on" unitname="g" sourcevalue="10" hasspace="False" negative="False" numbertype="1" tcsc="0">10g</st1:chmetcnv>中，选择DataModel(表示了应用的数据模型，应用系统通过DataModel来执行数据访问操作。) –-  New --  Business Tier – TopLink – Java Objects from Tables.

如下图：可以通过Connection下拉列表选择我们之前建立的数据库链接。

<v:shape id="_x0000_i1026" style="WIDTH: 452.25pt; HEIGHT: 306pt" type="#_x0000_t75"><v:imagedata o:title="1" src="file:///C:\DOCUME~1\BeanSoft\LOCALS~1\Temp\msohtml1\01\clip_image002.png"></v:imagedata></v:shape>

<o:p> </o:p>

在<st1:chmetcnv w:st="on" unitname="g" sourcevalue="11" hasspace="False" negative="False" numbertype="1" tcsc="0">11g</st1:chmetcnv>中，我们通过此操作，在Connection: 下拉列表中是选不到之前建立的数据库链接的. 需要我们在Database Navigator面板中选中我们建立的数据库链接，将其拖动到

Project面板中的DataModel上。这时我们才能使用之前建立的数据库链接。

个人认为: 在<st1:chmetcnv w:st="on" unitname="g" sourcevalue="10" hasspace="False" negative="False" numbertype="1" tcsc="0">10g</st1:chmetcnv>中，建立的Connection，将为所有的工程共同使用。

而在<st1:chmetcnv w:st="on" unitname="g" sourcevalue="11" hasspace="False" negative="False" numbertype="1" tcsc="0">11g</st1:chmetcnv>中，数据库链接独立于所有工程，需手动将其应用于现有工程。

<v:shape id="_x0000_i1027" style="WIDTH: 484.5pt; HEIGHT: 404.25pt" type="#_x0000_t75"><v:imagedata o:title="2" src="file:///C:\DOCUME~1\BeanSoft\LOCALS~1\Temp\msohtml1\01\clip_image004.png"></v:imagedata></v:shape>

<o:p> </o:p>

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后表之间关系的生成机制

通过TopLink由表影射生成POJO对象.表之间的关系,在<st1:chmetcnv w:st="on" unitname="g" sourcevalue="10" hasspace="False" negative="False" numbertype="1" tcsc="0">10g</st1:chmetcnv>和<st1:chmetcnv w:st="on" unitname="g" sourcevalue="11" hasspace="False" negative="False" numbertype="1" tcsc="0">11g</st1:chmetcnv>中,TopLink的处理机制有所不同:

<st1:chmetcnv w:st="on" unitname="g" sourcevalue="10" hasspace="False" negative="False" numbertype="1" tcsc="0">10g</st1:chmetcnv>中:

    private List expertiseAreasCollection;

    private List serviceRequestsCollection;

    private Integer prodId;

    private String name;

    private String image;

    private String description;

<v:shape id="_x0000_i1028" style="WIDTH: 229.5pt; HEIGHT: 301.5pt" type="#_x0000_t75"><v:imagedata o:title="2" src="file:///C:\DOCUME~1\BeanSoft\LOCALS~1\Temp\msohtml1\01\clip_image006.png"></v:imagedata></v:shape>

<o:p> </o:p>

<o:p> </o:p>

在<st1:chmetcnv w:st="on" unitname="g" sourcevalue="11" hasspace="False" negative="False" numbertype="1" tcsc="0">11g</st1:chmetcnv>中:

<v:shape id="_x0000_i1029" style="WIDTH: 224.25pt; HEIGHT: 425.25pt" type="#_x0000_t75"><v:imagedata o:title="3333333333333333" src="file:///C:\DOCUME~1\BeanSoft\LOCALS~1\Temp\msohtml1\01\clip_image008.png"></v:imagedata></v:shape>

关于Products.java,其中生成的属性为:

    private Collection expertiseAreasCollection;

    private Collection serviceRequestsCollection;

    private BigDecimal prodId;

    private String name;

    private String image;

private String description;

<o:p> </o:p>

注: <st1:chmetcnv w:st="on" unitname="g" sourcevalue="10" hasspace="False" negative="False" numbertype="1" tcsc="0">10g</st1:chmetcnv>中,关于表之间影射关系(1对多,多对1,等)生成的集合类为List<o:p></o:p>

   <st1:chmetcnv w:st="on" unitname="g" sourcevalue="11" hasspace="False" negative="False" numbertype="1" tcsc="0">11g</st1:chmetcnv>中,生成的集合类为Connection.<o:p></o:p>

   List是链表,Collection是集合,比List抽象层次更高.List可以按照索引单独访问一组对象, Collection可以用foreach循环访问其中的元素,<o:p></o:p>

List执行效率应该比Collection更高,实际中使用List的情况应该更多.<o:p></o:p>

不知道为什么<st1:chmetcnv w:st="on" unitname="g" sourcevalue="11" hasspace="False" negative="False" numbertype="1" tcsc="0">11g</st1:chmetcnv>生成的属性均为Collection?有待于进一步研究.   <o:p></o:p>

代码生成机制,代码格式化效果

在<st1:chmetcnv w:st="on" unitname="g" sourcevalue="10" hasspace="False" negative="False" numbertype="1" tcsc="0">10g</st1:chmetcnv>中,代码格式化效果更好,比<st1:chmetcnv w:st="on" unitname="g" sourcevalue="11" hasspace="False" negative="False" numbertype="1" tcsc="0">11g</st1:chmetcnv>智能,不知<st1:chmetcnv w:st="on" unitname="g" sourcevalue="10" hasspace="False" negative="False" numbertype="1" tcsc="0">10g</st1:chmetcnv>与<st1:chmetcnv w:st="on" unitname="g" sourcevalue="11" hasspace="False" negative="False" numbertype="1" tcsc="0">11g</st1:chmetcnv>代码格式化使用的是何插件?如何控制代码生成规则?

例,在<st1:chmetcnv w:st="on" unitname="g" sourcevalue="10" hasspace="False" negative="False" numbertype="1" tcsc="0">10g</st1:chmetcnv>中,

Public  Integer  getNextLineItem(){

}

方法中的{},在输入完{}后,光标停留在大括号之间,按回车键,代码格式自动整理好,如上.另起一行对其. 在<st1:chmetcnv w:st="on" unitname="g" sourcevalue="11" hasspace="False" negative="False" numbertype="1" tcsc="0">11g</st1:chmetcnv>中, 回车后,下行代码空出两个字符.

Public  Integer  getNextLineItem(){

}

以上可见,<st1:chmetcnv w:st="on" unitname="g" sourcevalue="10" hasspace="False" negative="False" numbertype="1" tcsc="0">10g</st1:chmetcnv>中的效果更佳.

Defining Page Flow and Navigation

将<st1:chmetcnv w:st="on" unitname="g" sourcevalue="10" hasspace="False" negative="False" numbertype="1" tcsc="0">10g</st1:chmetcnv>和<st1:chmetcnv w:st="on" unitname="g" sourcevalue="11" hasspace="False" negative="False" numbertype="1" tcsc="0">11g</st1:chmetcnv>中,关于页面Diagram和page创建过程稍有不同.此差别来源于所用视图层开发控件的变化<st1:chmetcnv w:st="on" unitname="g" sourcevalue=".1" hasspace="False" negative="False" numbertype="1" tcsc="0">.10g</st1:chmetcnv>中视图层开发的组件库主要为: ADF Faces Components;

ADF Faces HTML; JSF Core; JSF HTML.

如: <st1:chmetcnv w:st="on" unitname="g" sourcevalue="10" hasspace="False" negative="False" numbertype="1" tcsc="0">10g</st1:chmetcnv>中,在Components组件面板中选择ADF Faces Core时,可以使用控件: PanelPage,

如图1: SRDemoTemplate.jspx

评论

1 楼 jichongchong 2007-07-09  

前两年用过，文档少啊