hibernate入门（二）

第一个只是写完了查询和添加

这个补上 删除和修改

习惯性动作，整个项目中内容加载，这次不加载jar包信息，因为和上篇的一样，xml配置信息也相同，省去，本文章可运行

从struts的配置文件action开始

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">
    
    <struts>
    
        <package name="hibernate" extends="struts-default">
        
            <action name="save" class="com.test.action.PersonAction" method="save">
                <result name="success">/listAll.jsp</result>
            </action>
        
            <action name="getPerson" class="com.test.action.PersonAction" method="getPerson">
                <result name="success">/getPerson.jsp</result>
            </action>
        
            <action name="deletePerson" class="com.test.action.PersonAction" method="deletePerson">
                <result name="success">/listAll.jsp</result>
            </action>
            
            <action name="updatePPerson" class="com.test.action.PersonAction" method="getPerson">
                <result name="success">/updatePerson.jsp</result>
            </action>
            
            <action name="updatePerson" class="com.test.action.PersonAction" method="updatePerson">
                <result name="success">/listAll.jsp</result>
            </action>
        
        </package>
    
    </struts>

2.action文件

package com.test.action;

import java.util.List;

import javax.servlet.http.HttpServletRequest;

import org.apache.struts2.ServletActionContext;

import com.hibernate.model.Person;
import com.hibernate.persistence.DBPerson;
import com.opensymphony.xwork2.ActionSupport;

public class PersonAction extends ActionSupport
{
    private int id;

    private String username;

    private String password;

    private int age;

    public int getId()
    {
        return id;
    }

    public void setId(int id)
    {
        this.id = id;
    }

    public String getUsername()
    {
        return username;
    }

    public void setUsername(String username)
    {
        this.username = username;
    }

    public String getPassword()
    {
        return password;
    }

    public void setPassword(String password)
    {
        this.password = password;
    }

    public int getAge()
    {
        return age;
    }

    public void setAge(int age)
    {
        this.age = age;
    }

    // 完成用户增加的操作
    public String save() throws Exception
    {
        Person person = new Person();

        person.setUsername(username);
        person.setPassword(password);
        person.setAge(age);

        java.sql.Date registerDate = new java.sql.Date(new java.util.Date()
                .getTime());
        
        person.setRegisterdate(registerDate);
        
        DBPerson.save(person); //将person对象存到数据库中
        
        List<Person> list = DBPerson.listAll();
        
        HttpServletRequest request = ServletActionContext.getRequest();
        
        request.setAttribute("list", list);
        
        return SUCCESS;
    }
    
    public String getPerson() throws Exception
    {
        System.out.println("getPerson");
        Person person = DBPerson.getPersonById(id);

        HttpServletRequest request = ServletActionContext.getRequest();

        request.setAttribute("person", person);

        return SUCCESS;
    }

    public String deletePerson() throws Exception
    {
        DBPerson.removePerson(id);

        List<Person> list = DBPerson.listAll();

        HttpServletRequest request = ServletActionContext.getRequest();

        request.setAttribute("list", list);

        return SUCCESS;
    }

    public String updatePerson() throws Exception
    {
        Person person = DBPerson.getPersonById(id);

        person.setPassword(password);
        person.setAge(age);

        DBPerson.updatePerson(person);

        List<Person> list = DBPerson.listAll();

        HttpServletRequest request = ServletActionContext.getRequest();

        request.setAttribute("list", list);

        return SUCCESS;
    }
}

3.编写dao层文件

package com.hibernate.persistence;

import java.util.List;

import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.Transaction;

import com.hibernate.model.Person;
import com.hibernate.util.HibernateUtil;

public class DBPerson
{
    /**
     * 创建新的用户
     */
    
    public static void save(Person person)
    {
        Session session = HibernateUtil.currentSession();
        Transaction tx = session.beginTransaction(); //开启事务
        
        try
        {
            session.save(person);
            tx.commit();
        }
        catch(Exception ex)
        {
            System.out.println("增加用户异常发生！");
            if(null != tx)
            {
                tx.rollback();
            }
        }
        finally
        {
            HibernateUtil.closeSession(session);
        }
        
    }
    
    /**
     * 查询出所有用户
     */
    
    @SuppressWarnings("unchecked")
    public static List<Person> listAll()
    {
        Session session = HibernateUtil.currentSession();
        Transaction tx = session.beginTransaction(); //开启事务
        
        List<Person> list = null;
        
        try
        {
            Query query = session.createQuery("from Person"); //hql语句，Hibernate查询语句
            
            list = (List<Person>)query.list();
            
            tx.commit();
        }
        catch(Exception ex)
        {
            System.out.println("增加用户异常发生！");
            if(null != tx)
            {
                tx.rollback();
            }
        }
        finally
        {
            HibernateUtil.closeSession(session);
        }
        
        return list;
    }
    
    public static Person getPersonById(Integer id)
    {
        Session session = HibernateUtil.currentSession();
        Transaction tx = session.beginTransaction(); //开启事务
        
        Person person = null;
        
        try
        {
            //Object get(Class clazz, Serializable id)
            person = (Person)session.get(Person.class, id);
            
            tx.commit();
        }
        catch(Exception ex)
        {
            System.out.println("增加用户异常发生！");
            if(null != tx)
            {
                tx.rollback();
            }
        }
        finally
        {
            HibernateUtil.closeSession(session);
        }
        
        return person;
    }
    
    
    public static void removePerson(Integer id)
    {
        Session session = HibernateUtil.currentSession();
        Transaction tx = session.beginTransaction(); //开启事务
        
        try
        {
            Person person = (Person)session.get(Person.class,id);
            session.delete(person);
            
            tx.commit();
        }
        catch(Exception ex)
        {
            System.out.println("增加用户异常发生！");
            if(null != tx)
            {
                tx.rollback();
            }
        }
        finally
        {
            HibernateUtil.closeSession(session);
        }
    }
    
    public static void updatePerson(Person person)
    {
        Session session = HibernateUtil.currentSession();
        Transaction tx = session.beginTransaction(); //开启事务
        
        try
        {
            session.update(person);
            
            tx.commit();
        }
        catch(Exception ex)
        {
            System.out.println("增加用户异常发生！");
            if(null != tx)
            {
                tx.rollback();
            }
        }
        finally
        {
            HibernateUtil.closeSession(session);
        }
    }
    
    
}

上篇文章中就改了这三个文件。