Spring2.5+Struts1.3.8+JPA(Hibernate实现)整合之三

转载请注明:来自http://blog.csdn.net/M_ChangGong/ 作者:张燕广 

该篇主要编写实体bean和DAO层。

在src下创建包com.zyg.ssj.bean，并在该包中编写类Student，该类文件代码如下：

package com.zyg.ssj.bean;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;

@Entity
public class Student {
	private Integer stuId;
	private String stuName;
	
	public Student() {}
	
	public Student(String stuName) {
		this.stuName = stuName;
	}
	
	@Id @GeneratedValue
	public Integer getStuId() {
		return stuId;
	}
	public void setStuId(Integer stuId) {
		this.stuId = stuId;
	}
	
	@Column(length=20,nullable=true)
	public String getStuName() {
		return stuName;
	}
	public void setStuName(String stuName) {
		this.stuName = stuName;
	}
}

 

 

package com.zyg.ssj.dao;

import java.util.List;
import com.zyg.ssj.bean.Student;

public interface StudentDao {

	/**
	 * 保存学生信息
	 * @param student
	 */
	public abstract void save(Student student);

	/**
	 * 根据学号删除学生信息
	 * @param studentId
	 */
	public abstract void delete(Integer studentId);

	/**
	 * 根据学生删除学生信息
	 * @param studentId
	 */
	public abstract void delete(Student student);

	/**
	 * 更新学生信息
	 * @param student
	 */
	public abstract void update(Student student);

	/**
	 * 根据学号获取学生信息
	 * @param studentId
	 */
	public abstract Student getStudent(Integer studentId);
	
	/**
	 * 获取全部学生信息
	 * @param studentId
	 */
	@SuppressWarnings("unchecked")
	public abstract List<Student> getStudents();

}

在src下创建包com.zyg.ssj.dao.jpa，并在该包下创建接口StudentDao的实现类StudentDaoImpl，该类文件内容如下：

package com.zyg.ssj.dao.jpa;

import java.util.List;

import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;

import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;

import com.zyg.ssj.bean.Student;
import com.zyg.ssj.dao.StudentDao;

@Transactional
public class StudentDaoImpl implements StudentDao {
	@PersistenceContext
	private EntityManager em;
	
	/* (non-Javadoc)
	 * @see com.zyg.ssj.dao.jpa.StudentDao#save(com.zyg.ssj.bean.Student)
	 */
	public void save(Student student){
		System.out.println(student.getStuName());
		em.persist(student);
	}
	
	/* (non-Javadoc)
	 * @see com.zyg.ssj.dao.jpa.StudentDao#delete(java.lang.Integer)
	 */
	public void delete(Integer studentId){
		em.remove(em.getReference(Student.class, studentId));
	}
	
	/* (non-Javadoc)
	 * @see com.zyg.ssj.dao.jpa.StudentDao#delete(com.zyg.ssj.bean.Student)
	 */
	public void delete(Student student){
		em.remove(em.getReference(Student.class, student.getStuId()));
	}
	
	/* (non-Javadoc)
	 * @see com.zyg.ssj.dao.jpa.StudentDao#update(com.zyg.ssj.bean.Student)
	 */
	public void update(Student student){
		em.merge(student);
	}
	
	/* (non-Javadoc)
	 * @see com.zyg.ssj.dao.jpa.StudentDao#getStudent(java.lang.Integer)
	 */
	@Transactional(propagation=Propagation.NOT_SUPPORTED,readOnly=true)
	public Student getStudent(Integer studentId){
		return em.find(Student.class, studentId);
	}
	
	/* (non-Javadoc)
	 * @see com.zyg.ssj.dao.jpa.StudentDao#getStudents()
	 */
	@SuppressWarnings("unchecked")
	@Transactional(propagation=Propagation.NOT_SUPPORTED,readOnly=true)
	public List<Student> getStudents(){
		return (List<Student>)em.createQuery("select s from Student s")
				.getResultList();
	}
}

至此，实体bean和DAO层代码编写完成，下一篇我们编写service层代码。

代码都已经编写完毕，但是现在很困了，明天接着写吧。

在src下创建包com.zyg.ssj.dao，并在该包下创建接口StudentDao，该接口文件内容如下：

评论

1 楼 gouflv 2009-12-11  

如果逻辑层比较复杂的话 ,把事物放manager那一层控制会更好