hibernate and spring tips

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本文介绍了一个使用 Spring Hibernate Template 进行 saveOrUpdate 的示例，并展示了如何配置数据库连接及映射实体类。此外，还讲解了如何在 Spring 中通过不同方式获取 ApplicationContext。

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1Spring Hibernate Template Save Or Update

http://blog.youkuaiyun.com/wujunj/archive/2006/08/15/1067534.aspx

强烈推荐新手多去

http://www.java2s.com/ 转转。

/////////////////////////////////////////////////////////////////////////

import java.util.*;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.orm.hibernate3.HibernateTemplate;
import org.springframework.orm.hibernate3.HibernateCallback;

import org.hibernate.*;
import org.hibernate.criterion.*;

public class Main {


  public static void main(String[] args) {
    HibernateUtil.setup("create table EVENTS ( uid int, name VARCHAR, start_Date date, duration int);");

    // hibernate code start
        HibernateFactory.buildSessionFactory();
        SessionFactory sessionFactory= HibernateFactory.getSessionFactory();
        HibernateTemplate template= new HibernateTemplate(sessionFactory);

        Event event = new Event();
        event.setName("Spring Hibernate Template");
        template.saveOrUpdate(event);
        Event obj = (Event) template.load(Event.class, event.getId());

        HibernateUtil.checkData("select uid, name from events");

        HibernateFactory.closeFactory();

    // hibernate code end
  }

}

/////////////////////////////////////////////////////////////////////////
<?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 >
    <class name="Event" table="events">
        <id name="id" column="uid" type="long">
            <generator class="increment"/>
        </id>
        <property name="name" type="string"/>
        <property name="startDate" column="start_date" type="date"/>
        <property name="duration" type="integer"/>
    </class>
</hibernate-mapping>

/////////////////////////////////////////////////////////////////////////

import java.io.Serializable;
import java.util.Date;
import java.util.Set;
import java.util.LinkedHashSet;

public class Event implements Serializable {
    private Long id;
    private int duration;
    private String name;
    private Date startDate;

    public Event() {

    }

    public Event(String name) {
        this.name = name;
    }

    /**
     * @hibernate.id generator-class="native" column="uid"
     * @return
     */
    public Long getId() { return id; }
    public void setId(Long id) { this.id = id; }

    /**
     * @hibernate.property column="name"
     * @return
     */
    public String getName() { return name; }
    public void setName(String name) { this.name = name;   }

    /**
     * @hibernate.property column="start_date"
     * @return
     */
    public Date getStartDate() { return startDate; }
    public void setStartDate(Date startDate) { this.startDate = startDate; }

    /**
     * @hibernate.property column="duration"
     * @return
     */
    public int getDuration() { return duration; }
    public void setDuration(int duration) { this.duration = duration; }

}

/////////////////////////////////////////////////////////////////////////

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<hibernate-configuration>

    <session-factory>

        
        <property name="connection.driver_class">org.hsqldb.jdbcDriver</property>
        <property name="connection.url">jdbc:hsqldb:data/tutorial</property>
        <property name="connection.username">sa</property>
        <property name="connection.password"></property>

        
        <property name="connection.pool_size">1</property>

        
        <property name="dialect">org.hibernate.dialect.HSQLDialect</property>

        
        <property name="show_sql">true</property>

        <mapping resource="Event.hbm.xml"/>
    </session-factory>

</hibernate-configuration>

/////////////////////////////////////////////////////////////////////////
/**
* Represents Exceptions thrown by the Data Access Layer.
*/
public class DataAccessLayerException extends RuntimeException {
    public DataAccessLayerException() {
    }

    public DataAccessLayerException(String message) {
        super(message);
    }

    public DataAccessLayerException(Throwable cause) {
        super(cause);
    }

    public DataAccessLayerException(String message, Throwable cause) {
        super(message, cause);
    }
}

2 设置applicationContext.xml的名字或路径

当spring容器被启动的时候，似乎如果在web.xml中设置了ContextLoaderListener，就会去读applicationContext.xml。
如果要设置这个配置文件的名字或路径要在web.xml中加入

 
  
   
   <
   context-param
   >
   
        
   <
   param-name
   >
   contextConfigLocation
   </
   param-name
   >
   
        
   <
   param-value
   >
   
            /WEB-INF/applicationContext1.xml
            /WEB-INF/applicationContext2.xml
        
   </
   param-value
   >
   
    
   </
   context-param
   >

3在spring frame中获取application context

http://www.theserverside.com/discussions/thread.tss?thread_id=27869

To my understanding, in order to get a bean, you should get the
application context and call getBean. In the servlet layer it is easy,
all you need to do is

// test the spring framework
ServletContext servletContext =this.getServletContext();

WebApplicationContext wac = WebApplicationContextUtils.
getRequiredWebApplicationContext(servletContext);
		
User user = (User)wac.getBean("user");
在链接中讨论了如何在业务层business layer获取application context。

http://blog.youkuaiyun.com/amigoxie/archive/2007/02/27/1516346.aspx
spring为ApplicationContext提供的3种实现分别为：ClassPathXmlApplicationContext，
FileSystemXmlApplicationContext和XmlWebApplicationContext，其中
XmlWebApplicationContext是专为Web工程定制的。使用举例如下：
   1. FileSystemXmlApplicationContext
       eg1. ApplicationContext ctx = new FileSystemXmlApplicationContext("bean.xml"); //加载单个配置文件
       eg2. 
               String[] locations = {"bean1.xml", "bean2.xml", "bean3.xml"};
               ApplicationContext ctx = new FileSystemXmlApplicationContext(locations ); //加载单个配置文件
       eg3.

    ApplicationContext ctx =new FileSystemXmlApplicationContext("D:/project/bean.xml");//根据具体路径加载文件
2. ClassPathXmlApplicationContext
       eg1.   ApplicationContext ctx = new ClassPathXmlApplicationContext("bean.xml");
       eg2.
               String[] locations = {"bean1.xml", "bean2.xml", "bean3.xml"};
               ApplicationContext ctx = new ClassPathXmlApplication(locations);
       注：其中FileSystemXmlApplicationContext和ClassPathXmlApplicationContext与BeanFactory的xml文件定位方式一样是基于路径的。
3. XmlWebApplicationContext
   eg1. ServletContext servletContext = request.getSession().getServletContext();
        ApplicationContext ctx = WebApplicationContextUtils.getWebApplicationContext(servletContext);

4 如何在spring的multiactioncontroller中使用command

典型的方式，可如下定义一个方法
public ModelAndView insertAccount(HttpServletRequest request,HttpServletResponse response,Account account) {}
注意通常的方式是：
public ModelAndView insertAccount(HttpServletRequest request,HttpServletResponse response) {}
可以看到区别：就是第三个参数，如果第三个参数不是HttpSession对象，那么就会做为一个command对象来对待。

另外，还有一个方法bind()来利用。
详见http://www.javaeye.com/topic/19640