1. 关于左右表的概念。左表指的是在SQL语句中排在left join左边的表，右表指的是排在left join右边的表。
  2. 在拼成的大表中，左表排在左边，右表排在右边。
  3. on条件语句最好用=号对两表相应的主外键进行连接。当然，也可以用其他操作符，如>, <, 来连接两表的任一字段，此时的关系将非常复杂，连接后的记录数也随之而变得不确定。如果在一些特殊的场合中需要用到这种方式，必须通过简单的实例加以确认，否则，连接结果很可能不是我们所想要的！
  4. on条件语句不能省略。
  5. 可以连锁使用join，每次使用join都令另一表与当前的表或连接的结果相连接。

在下文中，用到了两个表，"部门"表与"组织"表，其中，"部门"表有一名为"组织编号"的外键，指向"组织"表中的主键"编号"。

inner join

  格式：select * from 部门 inner join 组织 on 部门.组织编号 = 组织.编号

  目的：将两表中符合on条件的所有记录都找出来。

  规律：

    1. 拼出的大表记录不会增加。
    2. 如果左边与右表的关系是一对多的关系，在选出的任一记录中，假若右表有多个记录与其对应，那么，连接后的左表，主键将不再唯一。

  典型应用：将存在多关系的引用表放在左表，将存在一关系的被引用表放在右表，通过=号将主外键进行连接，通过对右表设定过滤条件，选出相应的且主键唯一的左表记录。

  备注：inner join 是默认的连接方式，可缩写为join。

  转化为where子句：

    select * from 部门, 组织 where 部门.组织编号 = 组织.编号

left outter join

  格式: select * from 部门 left join 组织 on 部门.组织编号 = 组织.编号

  格式: select * from 组织 left join 部门 on 组织.编号 = 部门.组织编号

  目的：将左表的所有记录列出，右表中只要符合on条件的，与左表记录相拼合，不符合条件的，填以null值。

  规律：

    1. 选出所有符合条件的左表，如果左边与右表的关系是一对一的关系，则拼成的大表记录不会改变。
       如果左边与右表的关系是多对一的关系，则拼成的大表记录也不会改变。
       如果左边与右表的关系是一对多的关系，则拼成的大表记录会增加。对于每一具有一对多关系的左表记录，如果左表1：N与右表对应，那么会多出N-1条记录。例如，如果左表第一条记录1：3对应于右表，多出2条记录。如果左表第二条记录1：2对应于右表，则再多出1条记录。这样，总共多出3条记录。其他类推。
    2. 如果左边与右表的关系是一对多的关系，在选出的任一记录中，假若右表有多个记录与其对应，那么，连接后的左表，主键将不再唯一。
    3. 如果左边与右表的关系是一对多的关系，对于左表任一记录，如果右表没有记录与其相对应，则全部填以null值。

  典型应用：将存在多关系的引用表放在左表，将存在一关系的被引用表放在右表，通过对右表设定过滤条件，选出相应的且主键唯一的左表记录。

  备注：left outter join可用left join代替。在有些数据库中，如HSqlDb, 只能使用left join而不能使用left outter join。

  转化为where子句：

    select * from 部门, 组织 where 部门.组织编号 = 组织.编号

right outter join

  格式: select * from 部门 right join 组织 on 部门.组织编号 = 组织.编号

  格式: select * from 组织 right join 部门 on 部门.组织编号 = 组织.编号

  目的：将右表的所有记录列出，左表中只要符合on条件的，与右表记录相拼合，不符合条件的，填以null值。

  规律：(与left outter join相反)

  典型应用：可转化成left outter join。例如

    select * from 组织 right join 部门 on 部门.组织编号 = 组织.编号
    与
    select * from 部门 left join 组织 on 部门.组织编号 = 组织.编号
    的效果一样

  备注：right outter join可用right join代替。在有些数据库中，如HSqlDb, 没有实现right join功能。

  转化为where子句：

    select * from 部门, 组织 where 部门.组织编号 = 组织.编号

rpm -ivh j2sdk-1_3_1-linux-i386-rpm     (安装成功后，jdk将被安装在/usr/java/目录下)
    5,   vi当前用户（例root目录下）的.bash_profile文件，添加内容如下：

1export JAVA_HOME=/usr/java/j2sdk1.4.2_10
2export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
3export PATH=$PATH:$JAVA_HOME/bin

     6，java命令，验证环境是否配置成功。

TOMCAT的配置：
    
     1，下载jakarta-tomcat-5.0.28.tar.gz
     2， tar zxvf jakarta-tomcat.tar.gz
     3， 转换路径cd到tomcat/bin目录下：./startup.sh (启动tomcat)
     4， 在ie浏览器输入http://servername:port   （验证tomcat是否启动成功）
      

   

You've heard everyone praising the benefits of test-driven development, and you'd really like to try it yourself, but how do you get started on a real project? This talk gives you 12 practical ways to start writing tests, and keep writing them, regardless of your project's technology or development process. You'll be able to immediately apply these no-nonsense techniques toward improving your design and testing skills. In no time you'll be writing better software, and faster!

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• An introduction to Ajax and an orientation to the state of the ajaxian universe
• A demonstration of the basic ajaxian techniques through live coding. More advanced examples of Ajax will be demonstrated and deconstructed

You will understand:

• How the Google Maps UI is built (and why it isn't as hard as it looks)
• How Ajax can improve portals, community sites, and pretty much any other type of web application.

Furthermore, the issues surrounding how to create an Ajax application that doesn't turn into an unmaintainable pile of hacked up crap JavaScript will be discussed.

This talk will be presented by the founders of Ajaxian.com, a popular Ajax-related web portal.

Building Quality Applications with Ajax Frameworks
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Ajax techniques can lend tremendous richness to your Web UIs. But Ajax can be tedious and difficult to implement from scratch. Fortunately, there are a number of powerful frameworks that can make it much easier to do Ajax, including some that integrate with Java-based Web frameworks.

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• The popular Prototype, Dojo, MochiKit, DWR and Scriptaculous frameworks, each of which offers unique abilities to enhance your applications. These frameworks can be used with any server-side framework
• Their use with Struts and JavaServer Faces applications

This talk will also discuss the state of Ajax support for JavaServer Faces via third-party JSF components and JSF-specific frameworks.

You will understand:

• How to easily add amazing Ajax effects to your Java-based Web application.

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Dive into RIFE
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Essential EJB 3.0 Persistence
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OSWorkflow
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Portlet Development with JSF
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Productive Coder
Dr. Heinz Kabutz

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RAD That Ain't Bad: Domain Driven Development with Trails
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Refactoring Databases: Evolutionary Database Design
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Shale: The Next Struts?
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Software Visualization and Model Generation
Gregor Hohpe

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This talk applies the concepts of visualization and model generation to a broad range of usage scenarios, such as asynchronous messaging, software components and object-oriented applications.

The State of Web Frameworks
Craig McClanahan

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Bruce Snyder

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Jason Hunter

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XML, Schemas and Performance
Frank Cohen

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BOFs

The Importance of Preserving Object Identity while Clustering
Jonas Bonér and Patrick Calahan, Terracotta

Clustering and other forms of distributed computing are not easy in Java. The proliferation of clustered caches in the market today illustrates the need for tools to make clustering in Java easier. The problems with most current solutions are that they break Java's natural programming model – with unnatural API's and breaking fundamental object identity. This Birds of a Feather session will focus on the importance of preserving object identity in a cluster, and will illustrate a runtime system that understands the developer's domain objects and clusters objects across a cluster transparently while maintaining object identity, using detailed code examples to illustrate the concepts.