Using the DAO object of ZetaDB Form Builder ?

zk-studio

asked 2009-06-05 08:40:37 +0800

TLHP
111 ● 1 ● 3

Hi everybody,

I want to know how can we use the class DAO generated by ZetaDB Form Builder for other purpose?
For example in my class, i want to use a object DAO to to the access into database, but this object is always null, how can I initialize it ???

public class Test
{
  @Resource
  ItemDAO itemDAO; 
  
  public boolean checkExistance(int idItem)
  {    
    try
    {     
      Item item  = itemDAO.find(idItem);  (Here java.lang.NullPointerException is raised)
      System.out.print(item.getName());
    } 
    catch (EntityNotFoundException e)
    {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
}

Thanks in advance

delete flag offensive retag edit

5 Replies

Sort by » oldest newest

answered 2009-06-05 17:20:16 +0800

robertpic71
1275 ● 1

Could you check/post your spring-config?

<zksp-annot:component-scan base-package="org.zkoss.spring.jpa,org.zkforge.todo" />
<zksp:zk-config />

The DAO's extends the BasicDAO inside the org.zkoss.spring.jpa-package. You have to configure spring to scan the zk-package. W/o zk-package no EntityManager will be injected.

/Robert

link publish delete flag offensive edit

answered 2009-06-07 22:07:27 +0800

TLHP
111 ● 1 ● 3

thanks Robert, here my test

- I create a ZK project, use ZETA Form Builder to build a CRUD application
- CheckDAO.java , i just want to use a DAO class generated by ZETA to search a bean from database and show one of those attribut via showTheName method.

package testDAO;

import javax.annotation.Resource;
import org.zkoss.spring.jpa.EntityNotFoundException;

import test.help_topic.Help_topicDAO;
import test.help_topic.base.Help_topic;

public class CheckDAO {
	@Resource
	Help_topicDAO helpDAO;
	public String showTheName()
	{
		try {
			Help_topic helpBean = helpDAO.find(1); // find bean with ID=1
			return helpBean.getName();
		} catch (EntityNotFoundException e) {			
			// TODO Auto-generated catch block
			e.printStackTrace();
			return "Bean not found";
		}		
	}	
}

- application-context.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:sec="http://www.springframework.org/schema/security"
    xmlns:zksp="http://www.zkoss.org/2008/zkspring"
    xmlns:zksp-annot="http://www.zkoss.org/2008/zkspring-annot"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="
	http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
	http://www.springframework.org/schema/security http://www.springframework.org/schema/security/spring-security-2.0.1.xsd
    http://www.zkoss.org/2008/zkspring http://www.zkoss.org/2008/zkspring/zkspring.xsd
    http://www.zkoss.org/2008/zkspring-annot http://www.zkoss.org/2008/zkspring-annot/zkspring-annot.xsd
	">
	
	<!--
	ZK Spring config 
	 -->    
	<zksp-annot:component-scan base-package="org.zkoss.spring.jpa,test,testDAO"/>
	<zksp:zk-config/>
	
	<!-- 
    Injected properties
    --> 
    <bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
	    <property name="locations">
	    <list>            
            <value>classpath:/config/datasource.properties</value>
	    </list>
	    </property>
        
    </bean>
</beans>

Robert, if you did that work, let me know or show me some code, I appreciate that

Thanks