Martin.guo
J2ee 架构中一般都要考虑 Web Framework 的选择。很多h选择比较行?/span> Struts 。项目组中遇到过q样的情况，有些Z熟?zhn)?/span> Struts Q而有些h又对 Struts 青睐有加。有没有一个折中的办法来满x有的人呢Q?/span>
我是q样设计的：(x)
通过拦截提交?/span> ActionServlet 上的 http hQ经q?/span> Http Parse 来收集请求参敎ͼ?/span> Name-Value 的Ş式存放ؓ(f)h值对象，q且攑֜hU程相关的上下文中。这个时候你可以在 Action 执行l束前的M地方拿到q些h数据?jin)?/span>
在这个基上，我们保留?/span> Struts ?/span> Action Qƈ且规?/span> Action ?/span> execute Ҏ(gu)里不能出CQ何跟业务相关的代?/span> , 仅仅是负责页面的{?/span>
那么业务怎么办呢Q我们定义了(jin)一个接?/span> Command, 它也只有一个方?/span> , 我们也取名字?/span> execute, q且没有M参数和返回数倹{该Ҏ(gu)的职责就是执行业务逻辑。这个时候你p问了(jin)?/span> Action 里抽M务逻辑Q怎么调用 Command 呢？h提交的数据怎么l?/span> Command ?/span> ?Command 执行完后的业务数据怎么q回Q?/span>
我们设计?jin)一个业务执行器Q它的功能就是执?/span> Command 的业务逻辑实现 . 而把执行器的执行写到?/span> Action 里面。这样就隔离?jin)页面流转和业务执行?/span> Action 的代码显的很l和模板化?/span>
׃h数据是放在请求线E相关的上下文中Q所以可以很方便的拿到。同?/span> Command 执行完毕的返回数据也是通过q个上下文返回给 Action 或者其他跟此请求线E相关的lgQ说白一点就是此U程能够跑到的Q何代码处都可以去跟上下文交互Q存取线E相关的数据和服务?/span>
设计到此为止Q已l可以回{开头的问题?jin)?/span>
对于熟?zhn)?/span> Struts 的h呢，可以U极攑ֿ(j)的?/span> Struts 标签Q?/span> Formbean, 但有一点就是自p?/span> FormBean 攑ֈU程相关的上下文中，q样你就可以?/span> Command 里面L出来工作?jin)，同?/span> Command 执行完毕后，你就可以手把返回数据填充到q个 FormBean 里面M(jin)。跟你^时用没有太大区别?/span>
而对于不熟?zhn)的h呢，你可能不喜欢?/span> Struts 标签Q也可能不喜Ƣ死板的 Formbean, 那么 OK Q你完全不用兛_(j)q些Q你只要直接?/span> Command 里面d逻辑代码可以了(jin)。但有一点就是要Q你要手工把q回的数据集合放?/span> request 里面去，然后到流转的 JSP 里面取出来展C?/span>
OK Q皆大欢喜?/span>
msn:gdq123@hotmail.com
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1.建立架构的Q务ƈ且Ş成架构团队?br />2.建立q且文档化架构需求?br />3.设计架构
4.验证架构是否辑ֈ需?br />5.发布架构到开发团?br />
然后我们l说q五步骤
W一Q架构是需要有目标的，一般是Z(jin)满长期的业务需求。然后去制定dq且明确里程。让架构l的每个人都明确架构的目标以?qing)Q务的q行和Q务之间的关系。M架构设想q个时候需要出来了(jin)。关键组件设想也应该有了(jin)?br />W二Q这个时候就需要按照目标去分开整理架构的需求了(jin)。开始可能是很多的需求烦(ch)引，每个索引是一两句话的表达。对于烦(ch)引要l出单的描述。烦(ch)引评审之后需要细化需求，是一个更l的需求整理，除了(jin)文字描述Q还可以配置囑Ş{。然后要做的是建立use case去覆盖这些需求?br />W三Q设计架构可以分为概要设计和详细设计阶段。概要设计需要给Z个比较轮廓性的设计说明Q能够比较简要的通过q些设计元素去阐quse caseQ在M上把故事讲完整。然后评审，q入详细设计阶段Q细化的设计更ؓ(f)完整和脓(chung)q实现。同样需要一个说故事的过E，把use case通过详细设计的元素说的更为生动和形象。然后去实现和整合?br />W四Q验证的q程是测试的一个过E，在需求阶D会(x)立很多试计划和用例。对需求进行一个扫荡，看实现是否到达了(jin)承诺?br />W五Q不断测试ƈ且反馈修改之后，E_版本可以发布到开发团队了(jin)?br />
个h观点Q请大家多讨论?br />
架构的设计部?
1。更应该侧重l徏的分解以?qing)组件之间的接口关系。比一般的软g设计q程Q更H出lg的接口特性和使用描述。组件的功能列表Q生命周期，q发情况说明Q通讯消息格式{?
2。架构中的组件是有统一的架构思想和原则。组件是要被U束的?
3。组仉要提供事例代码，典型应用场景Q异总?qing)测试说明?
4。组件有时候是要映到物理视图中的q程?
5。侧重架构系l的动态特性，lg之间的协作关pR?
msn:gdq123@hotmail.com
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--昄日期不详,q按部门排序输出,日期格式为yyyy-mm-dd?br />select emp_no ,emp_name ,dept ,
isnull(convert(char(10),birthday,120),'日期不详') birthday
from employee
order by dept
--2、查找与喻自强在同一个单位的员工姓名、性别、部门和职称
select emp_no,emp_name,dept,title
from employee
where emp_name<>'喻自? and dept in
(select dept from employee
where emp_name='喻自?)
--3、按部门q行汇总，l计每个部门的d?br />select dept,sum(salary)
from employee
group by dept
--4、查扑֕品名UCؓ(f)14寸显C器商品的销售情况，
--昄该商品的~号、销售数量、单价和金额
select a.prod_id,qty,unit_price,unit_price*qty totprice
from sale_item a,product b
where a.prod_id=b.prod_id and prod_name='14寸显C器'
--5、在销售明l表中按产品~号q行汇总，l计每种产品的销售数量和金额
select prod_id,sum(qty) totqty,sum(qty*unit_price) totprice
from sale_item
group by prod_id
--6、用convert函数按客L(fng)L(fng)计每个客?996q的订单总金?br />select cust_id,sum(tot_amt) totprice
from sales
where convert(char(4),order_date,120)='1996'
group by cust_id
--7、查找有销售记录的客户~号、名U和订单总额
select a.cust_id,cust_name,sum(tot_amt) totprice
from customer a,sales b
where a.cust_id=b.cust_id
group by a.cust_id,cust_name
--8、查扑֜1997q中有销售记录的客户~号、名U和订单总额
select a.cust_id,cust_name,sum(tot_amt) totprice
from customer a,sales b
where a.cust_id=b.cust_id and convert(char(4),order_date,120)='1997'
group by a.cust_id,cust_name
--9、查找一ơ销售最大的销售记?br />select order_no,cust_id,sale_id,tot_amt
from sales
where tot_amt=
(select max(tot_amt)
from sales)
--10、查找至有3ơ销售的业务员名单和销售日?br />select emp_name,order_date
from employee a,sales b
where emp_no=sale_id and a.emp_no in
(select sale_id
from sales
group by sale_id
having count(*)>=3)
order by emp_name
--11、用存在量词查找没有订货记录的客户名U?br />select cust_name
from customer a
where not exists
(select *
from sales b
where a.cust_id=b.cust_id)
--12、用左外连接查找每个客L(fng)客户~号、名U、订货日期、订单金?br />--订货日期不要昄旉Q日期格式ؓ(f)yyyy-mm-dd
--按客L(fng)h序，同一客户再按订单降序排序输出
select a.cust_id,cust_name,convert(char(10),order_date,120),tot_amt
from customer a left outer join sales b on a.cust_id=b.cust_id
order by a.cust_id,tot_amt desc
--13、查?6M DRAM的销售情况，要求昄相应的销售员的姓名?br />--性别Q销售日期、销售数量和金额Q其中性别用男、女表示
select emp_name 姓名, 性别= case a.sex when 'm' then '?
when 'f' then '?
else '?
end,
销售日? isnull(convert(char(10),c.order_date,120),'日期不详'),
qty 数量, qty*unit_price as 金额
from employee a, sales b, sale_item c,product d
where d.prod_name='16M DRAM' and d.prod_id=c.prod_id and
a.emp_no=b.sale_id and b.order_no=c.order_no
--14、查找每个h的销售记录，要求昄销售员的编受姓名、性别?br />--产品名称、数量、单仗金额和销售日?br />select emp_no ~号,emp_name 姓名, 性别= case a.sex when 'm' then '?
when 'f' then '?
else '?
end,
prod_name 产品名称,销售日? isnull(convert(char(10),c.order_date,120),'日期不详'),
qty 数量, qty*unit_price as 金额
from employee a left outer join sales b on a.emp_no=b.sale_id , sale_item c,product d
where d.prod_id=c.prod_id and b.order_no=c.order_no
--15、查N售金额最大的客户名称和总货?br />select cust_name,d.cust_sum
from customer a,
(select cust_id,cust_sum
from (select cust_id, sum(tot_amt) as cust_sum
from sales
group by cust_id ) b
where b.cust_sum =
( select max(cust_sum)
from (select cust_id, sum(tot_amt) as cust_sum
from sales
group by cust_id ) c )
) d
where a.cust_id=d.cust_id
--16、查N售总额于1000元的销售员~号、姓名和销售额
select emp_no,emp_name,d.sale_sum
from employee a,
(select sale_id,sale_sum
from (select sale_id, sum(tot_amt) as sale_sum
from sales
group by sale_id ) b
where b.sale_sum <1000
) d
where a.emp_no=d.sale_id
--17、查找至销售了(jin)3U商品的客户~号、客户名U、商品编受商品名U、数量和金额
select a.cust_id,cust_name,b.prod_id,prod_name,d.qty,d.qty*d.unit_price
from customer a, product b, sales c, sale_item d
where a.cust_id=c.cust_id and d.prod_id=b.prod_id and
c.order_no=d.order_no and a.cust_id in (
select cust_id
from (select cust_id,count(distinct prod_id) prodid
from (select cust_id,prod_id
from sales e,sale_item f
where e.order_no=f.order_no) g
group by cust_id
having count(distinct prod_id)>=3) h )
--18、查找至与世界技术开发公叔R售相同的客户~号、名U和商品~号、商品名U、数量和金额
select a.cust_id,cust_name,d.prod_id,prod_name,qty,qty*unit_price
from customer a, product b, sales c, sale_item d
where a.cust_id=c.cust_id and d.prod_id=b.prod_id and
c.order_no=d.order_no and not exists
(select f.*
from customer x ,sales e, sale_item f
where cust_name='世界技术开发公? and x.cust_id=e.cust_id and
e.order_no=f.order_no and not exists
( select g.*
from sale_item g, sales h
where g.prod_id = f.prod_id and g.order_no=h.order_no and
h.cust_id=a.cust_id)
)
19、查找表中所有姓刘的职工的工P部门Q薪?br />select emp_no,emp_name,dept,salary
from employee
where emp_name like '?'
20、查找所有定单金额高?000的所有客L(fng)?br />select cust_id
from sales
where tot_amt>2000
21、统计表中员工的薪水?000-6000之间的h?br />select count(*)as 人数
from employee
where salary between 4000 and 6000
22、查询表中的同一部门的职工的q_工资Q但只查询＂住址Q是Q上市(jng)Q的员工
select avg(salary) avg_sal,dept
from employee
where addr like '上v?'
group by dept
23、将表中住址?上v?的员工住址改ؓ(f)"北京?
update employee
set addr like '北京?
where addr like '上v?
24、查找业务部或会(x)计部的女员工的基本信息?br />select emp_no,emp_name,dept
from employee
where sex='F'and dept in ('业务','?x)?)
25、显C每U品的销售金额dQƈ依销售金额由大到输出?br />select prod_id ,sum(qty*unit_price)
from sale_item
group by prod_id
order by sum(qty*unit_price) desc
26、选取~号界于'C0001'?C0004'的客L(fng)受客户名U、客户地址?br />select CUST_ID,cust_name,addr
from customer
where cust_id between 'C0001' AND 'C0004'
27、计出一共销售了(jin)几种产品?br />select count(distinct prod_id) as '共销售品数'
from sale_item
28、将业务部员工的薪水上调3%?br />update employee
set salary=salary*1.03
where dept='业务'
29、由employee表中查找?gu)水最低的员工信息?br />select *
from employee
where salary=
(select min(salary )
from employee )
30、用join查询客户姓名?客户?所购货物的"客户名称","定单金额","定货日期","?sh)话L(fng)"
select a.cust_id,b.tot_amt,b.order_date,a.tel_no
from customer a join sales b
on a.cust_id=b.cust_id and cust_name like '客户?
31、由sales表中查找?gu)单金额大?E0013业务员在1996/10/15q天所接每一张订单的金额"的所有订单?br />select *
from sales
where tot_amt>all
(select tot_amt
from sales
where sale_id='E0013'and order_date='1996/10/15')
order by tot_amt
32、计?P0001'产品的^均销售单?br />select avg(unit_price)
from sale_item
where prod_id='P0001'
33、找出公司女员工所接的定单
select sale_id,tot_amt
from sales
where sale_id in
(select sale_id from employee
where sex='F')
34、找出同一天进入公司服务的员工
select a.emp_no,a.emp_name,a.date_hired
from employee a
join employee b
on (a.emp_no!=b.emp_no and a.date_hired=b.date_hired)
order by a.date_hired
35、找出目前业l超q?32000元的员工~号和姓名?br />select emp_no,emp_name
from employee
where emp_no in
(select sale_id
from sales
group by sale_id
having sum(tot_amt)<232000)
36、查询出employee表中所有女职工的^均工资和住址在＂上v?jng)＂的所有女职工的^均工?br />select avg(salary)
from employee
where sex like 'f'
union
select avg(salary)
from employee
where sex like 'f' and addr like '上v?'
37、在employee表中查询薪水过员工q_薪水的员工信息?br />Select *
from employee
where salary>( select avg(salary)
from employee)
38?扑և目前销售业l超q?0000元的业务员编号及(qing)销售业l，q按销售业l从大到排序?br />Select sale_id ,sum(tot_amt)
from sales
group by sale_id
having sum(tot_amt)>10000
order by sum(tot_amt) desc
39?扑և公司男业务员所接且订单金额过2000元的订单号及(qing)订单金额?
Select order_no,tot_amt
From sales ,employee
Where sale_id=emp_no and sex='M' and tot_amt>2000
40?查询sales表中订单金额最高的订单号及(qing)订单金额?br />Select order_no,tot_amt from sales
where tot_amt=(select max(tot_amt) from sales)
41?查询在每张订单中订购金额过4000元的客户名及(qing)其地址?br />Select cust_name,addr from customer a,sales b
where a.cust_id=b.cust_id and tot_amt>4000
42?求出每位客户的总订购金额，昄出客户号?qing)总订购金额，q按总订购金额降序排列?br />Select cust_id,sum(tot_amt) from sales
Group by cust_id
Order by sum(tot_amt) desc
43?求每位客戯购的每种产品的L量及(qing)q_单h(hun)Qƈ按客户号Q品号从小到大排列?br />Select cust_id,prod_id,sum(qty),sum(qty*unit_price)/sum(qty)
From sales a, sale_item b
Where a.order_no=b.order_no
Group by cust_id,prod_id
Order by cust_id,prod_id
44?查询订购?jin)三U以上品的订单受?br />Select order_no
from sale_item
Group by order_no
Having count(*)>3
45?查询订购的品至包含了(jin)订单3号中所订购产品的订单?br />Select distinct order_no
From sale_item a
Where order_no<>'3'and not exists (
Select * from sale_item b where order_no ='3' and not exists
(select * from sale_item c where c.order_no=a.order_no and c.prod_id=b.prod_id))
46?在sales表中查找?gu)单金额大?E0013业务员在1996/11/10q天所接每一张订单的金额"的所有订单，q显C承接这些订单的业务员和该订单的金额?br />Select sale_id,tot_amt from sales
where tot_amt>all(select tot_amt
from sales
where sale_id='E0013' and order_date='1996-11-10')
47?查询末承接业务的员工的信息?br />Select *
From employee a
Where not exists
(select * from sales b where a.emp_no=b.sale_id)
48?查询来自上v?jng)的客户的姓名，电(sh)话、订单号?qing)订单金额?br />Select cust_name,tel_no,order_no,tot_amt
From customer a ,sales b
Where a.cust_id=b.cust_id and addr='上v?
49?查询每位业务员各个月的业l，q按业务员编受月份降序排序?br />Select sale_id,month(order_date), sum(tot_amt)
from sales
group by sale_id,month(order_date)
order by sale_id,month(order_date) desc
50?求每U品的总销售数量及(qing)总销售金额，要求昄Z品编受品名UͼL量及(qing)总金额，q按产品号从到大排列?
Select a.prod_id,prod_name,sum(qty),sum(qty*unit_price)
From sale_item a,product b
Where a.prod_id=b.prod_id
Group by a.prod_id,prod_name
Order by a.prod_id
51?查询总订购金额超q?C0002'客户的总订购金额的客户P客户名及(qing)其住址?br />Select cust_id, cust_name,addr
From customer
Where cust_id in (select cust_id from sales
Group by cust_id
Having sum(tot_amt)>
(Select sum(tot_amt) from sales where cust_id='C0002'))
52?查询业W最好的的业务员受业务员名及(qing)其总销售金额?br />select emp_no,emp_name,sum(tot_amt)
from employee a,sales b
where a.emp_no=b.sale_id
group by emp_no,emp_name
having sum(tot_amt)=
(select max(totamt)
from (select sale_id,sum(tot_amt) totamt
from sales
group by sale_id) c)
53?查询每位客户所订购的每U品的详细清单Q要求显C出客户P客户名，产品P产品名，数量?qing)单仗?br />select a.cust_id, cust_name,c.prod_id,prod_name,qty, unit_price
from customer a,sales b, sale_item c ,product d
where a.cust_id=b.cust_id and b.order_no=c.order_no and c.prod_id=d.prod_id
54?求各部门的^均薪_(d)要求按^均薪水从到大排序?br />select dept,avg(salary)
from employee
group by dept
order by avg(salary)
]]>