通过Hibernate反向工程生成个DAO：
package dao; import java.util.List;
import org.hibernate.LockMode;
import org.hibernate.Query;
import org.hibernate.criterion.Example;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory; /**
* A data access object (DAO) providing persistence and search support for
* Student entities. Transaction control of the save(), update() and delete()
* operations can directly support Spring container-managed transactions or they
* can be augmented to handle user-managed Spring transactions. Each of these
* methods provides additional information for how to configure it for the
* desired type of transaction control.
*
* @see dao.Student
* @author MyEclipse Persistence Tools
*/ public class StudentDAO extends BaseHibernateDAO {
private static final Logger log = LoggerFactory.getLogger(StudentDAO.class);
// property constants
public static final String SNAME = "sname";
public static final String EMAIL = "email"; public void save(Student transientInstance) {
log.debug("saving Student instance");
try {
getSession().save(transientInstance);
log.debug("save successful");
} catch (RuntimeException re) {
log.error("save failed", re);
throw re;
}
} public void delete(Student persistentInstance) {
log.debug("deleting Student instance");
try {
getSession().delete(persistentInstance);
log.debug("delete successful");
} catch (RuntimeException re) {
log.error("delete failed", re);
throw re;
}
} public Student findById(java.lang.Integer id) {
log.debug("getting Student instance with id: " + id);
try {
Student instance = (Student) getSession().get("dao.Student", id);
return instance;
} catch (RuntimeException re) {
log.error("get failed", re);
throw re;
}
} public List findByExample(Student instance) {
log.debug("finding Student instance by example");
try {
List results = getSession().createCriteria("dao.Student")
.add(Example.create(instance)).list();
log.debug("find by example successful, result size: "
+ results.size());
return results;
} catch (RuntimeException re) {
log.error("find by example failed", re);
throw re;
}
} public List findByProperty(String propertyName, Object value) {
log.debug("finding Student instance with property: " + propertyName
+ ", value: " + value);
try {
String queryString = "from Student as model where model."
+ propertyName + "= ?";
Query queryObject = getSession().createQuery(queryString);
queryObject.setParameter(0, value);
return queryObject.list();
} catch (RuntimeException re) {
log.error("find by property name failed", re);
throw re;
}
} public List findBySname(Object sname) {
return findByProperty(SNAME, sname);
} public List findByEmail(Object email) {
return findByProperty(EMAIL, email);
} public List findAll() {
log.debug("finding all Student instances");
try {
String queryString = "from Student";
Query queryObject = getSession().createQuery(queryString);
return queryObject.list();
} catch (RuntimeException re) {
log.error("find all failed", re);
throw re;
}
} public Student merge(Student detachedInstance) {
log.debug("merging Student instance");
try {
Student result = (Student) getSession().merge(detachedInstance);
log.debug("merge successful");
return result;
} catch (RuntimeException re) {
log.error("merge failed", re);
throw re;
}
} public void attachDirty(Student instance) {
log.debug("attaching dirty Student instance");
try {
getSession().saveOrUpdate(instance);
log.debug("attach successful");
} catch (RuntimeException re) {
log.error("attach failed", re);
throw re;
}
} public void attachClean(Student instance) {
log.debug("attaching clean Student instance");
try {
getSession().lock(instance, LockMode.NONE);
log.debug("attach successful");
} catch (RuntimeException re) {
log.error("attach failed", re);
throw re;
}
}
}
以及相应的studentPO.java
package dao; /**
* Student entity. @author MyEclipse Persistence Tools
*/
public class Student extends AbstractStudent implements java.io.Serializable { // Constructors /** default constructor */
public Student() {
} /** full constructor */
public Student(String sname, String email) {
super(sname, email);
} }
package dao; /**
* AbstractStudent entity provides the base persistence definition of the
* Student entity. @author MyEclipse Persistence Tools
*/ public abstract class AbstractStudent implements java.io.Serializable { // Fields private Integer sid;
private String sname;
private String email; // Constructors /** default constructor */
public AbstractStudent() {
} /** full constructor */
public AbstractStudent(String sname, String email) {
this.sname = sname;
this.email = email;
} // Property accessors public Integer getSid() {
return this.sid;
} public void setSid(Integer sid) {
this.sid = sid;
} public String getSname() {
return this.sname;
} public void setSname(String sname) {
this.sname = sname;
} public String getEmail() {
return this.email;
} public void setEmail(String email) {
this.email = email;
} }
package dao; import org.hibernate.Session; /**
* Data access interface for domain model
* @author MyEclipse Persistence Tools
*/
public interface IBaseHibernateDAO {
public Session getSession();
}
package dao; import hibernate.HibernateSessionFactory;
import org.hibernate.Session; /**
* Data access object (DAO) for domain model
* @author MyEclipse Persistence Tools
*/
public class BaseHibernateDAO implements IBaseHibernateDAO { public Session getSession() {
return HibernateSessionFactory.getSession();
} }