2006年6月22日随笔档案 - aimyxmu

2006年6月22日

writer

注意writer的参数有多个,特别是有一个boolean的参数决定刷新或在附加文本

            log =    new PrintWriter( new FileOutputStream(fl, true ), true );
            SimpleDateFormat df = new SimpleDateFormat( " yyyy.MM.dd 'at' hh:mm:ss\n " );
            Date now = new Date();
            String dateformat = df.format(now)
            BufferedWriter bf   = new BufferedWriter( new FileWriter(fl, true ));
            bf.append(dateformat);
            bf.close();
            log.println( " start connection databse: " );
            log.println( " driver name: " .concat(driveName);

输出的结果示例:

2006.12.12 at 10:21:13

start connection databse:

driver name:oracle.jdbc.driver.OracleDriver

posted @ 2006-12-12 12:16 aimy 阅读(214) | 评论 (0) | 编辑收藏

工作流的错误

1、org.hibernate.ObjectNotFoundException: No row with the given identifier exists: [com.xindeco.business.pojo.NonageRegister#82]
at org.hibernate.ObjectNotFoundException.throwIfNull(ObjectNotFoundException.java:27)
at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:65)
at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:463)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:398)
at org.apache.catalina.core.ApplicationDispatcher.forward

错误的原因：
在nonregsiter中已经手动删除了id=‘82’的记录，而在WF_task以及wf-proces中还有bizclass = '3' && bizId = '82'的记录,只要删除wf-task中相应的记录.

posted @ 2006-07-09 16:17 aimy 阅读(227) | 评论 (0) | 编辑收藏

WF_Process—理解

ProcessInstance.hbm.xml：

<? xml version = " 1.0 " encoding = " UTF-8 " ?>

<! DOCTYPE hibernate - mapping PUBLIC

" -//Hibernate/Hibernate Mapping DTD 3.0//EN "

" http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd " >

< hibernate - mapping

< class

name = " com.xindeco.workflow.ProcessInstance "

table = " WF_PROCESS "

dynamic - update = " true "

dynamic - insert = " true "

select - before - update = " false "

optimistic - lock = " version "

< id

name = " ID "

column = " ID "

type = " long "

length = " 30 "

< generator class = " native " >

</ generator >

</ id >

< discriminator

column = " bizClass "

type = " string "

< property

name = " state "

type = " java.lang.Integer "

update = " true "

insert = " true "

access = " property "

column = " state "

length = " 10 "

< many - to - one

name = " flow "

class = " com.xindeco.workflow.WFFlow "

cascade = " none "

outer - join = " auto "

update = " true "

insert = " true "

access = " property "

column = " flowId "

< set

name = " tasks "

lazy = " true "

inverse = " true "

cascade = " delete "

sort = " unsorted "

< key

column = " processId "

</ key >

< one - to - many

class = " com.xindeco.workflow.WFTask "

</ set >

</ class >

</ hibernate - mapping >

CollRegPI.hbm.xml：

<?xml version="1.0"?>

<!DOCTYPE hibernate-mapping PUBLIC

"-//Hibernate/Hibernate Mapping DTD 3.0//EN"

"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping default-access="field" >

<subclass name="com.xindeco.business.pojo.wf.CollRegPI"

discriminator-value="2"

extends="com.xindeco.workflow.ProcessInstance"

lazy="false">

<many-to-one name="collReg"

class="com.xindeco.business.pojo.CollReg"

column="bizId"

cascade="none"/>

</subclass>

</hibernate-mapping>

数据库的数据：

     id    flowid    bizId   bizClass   state
  21      2          9          2              0
22         2         10         2             0
23         2         11         2              0
24         2         12         2              0
25         2         13         2              0
26         2         14         2              0
29         2         17         2             0
30         2         18         2            1
44         4         1          32             0
45         4       2           32             1
46         5          1          33             0
47       5          2           33             1
48        5          3           33             0
50      3          1            3              0
51      3         1            3              0

如果bizclass=2是同一种类型的class。由

<discriminator

column="bizClass"

type="string"

/>来表示。

posted @ 2006-07-06 10:37 aimy 阅读(384) | 评论 (0) | 编辑收藏

no persistent for class

org.hibernate.hql.QuerySplitter - no persistent classes found for query class:
意味着你没有将someclass的配置文件放在hibernate.config或没有写配置文件。

posted @ 2006-07-04 10:30 aimy 阅读(1169) | 评论 (0) | 编辑收藏

6.26 spring 创建bean

1,通过构造函数创建bean

相当于

basedaoimpl baseDAO = new BaseDAOImpl();

2,通过静态工厂创建bean

<bean id="driver1" class="com.aimy.driver.driverManager"

factory-method="createInstance"/>

相当于

Object driver1 = driverManager.createInstance();

其中没有指定driverManager.createInstance();返回对象的类型，而且createInstance()必须是static方法
3，通过实例工厂方法创建bean

＜bean id="father" class="com.aimy.Father"/>

．．．．．．．．

相当于

Father father = new Father();

Object son = father.createSon();

其中father和son必须在同一个bean工厂或父bean工厂，即在同一个applicationcontext或子applicationcontext

二、如果applicationcontext默认预实例化那些singleton　bean，这样就可以在beanfactory装载时就检查出错误，而如果singleton　bean设置为lazy－mode，

posted @ 2006-06-26 23:26 aimy 阅读(233) | 评论 (0) | 编辑收藏

6.26

hibernate 保存空值的细节
1。如果字段在pojo类中是复杂对象类型，则在数据库用nulll表示。
2。如果字段在pojo类中是简单数据类型，则在数据库用0表示。

posted @ 2006-06-26 09:56 aimy 阅读(170) | 评论 (0) | 编辑收藏

javascript的常犯错误

1. document.name.value----->document.all.name.value
2. eval(document.all.name)---->eval('document.all.name')
3.javascript:window.history.go(-1)
4、在action方法中只要抛出exception，就会跳到jspexception页面中，怎么处理。

posted @ 2006-06-22 13:19 aimy 阅读(188) | 评论 (0) | 编辑收藏

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