* save()方法提供了向數(shù)據(jù)庫中添加數(shù)據(jù)的功能,但只能添加,這個(gè)DAO沒有生成Update()的方法
* 但你可以簡單的八save()方法改稱具有Update功能:將getSession().save * (transientInstance);這句改成
* getSession().merge(transientInstance);或者getSession().saveOrUpdate
* (transientInstance);
public void save(User transientInstance) {
log.debug("saving User instance");
try {
Session session=getSession();
Transaction tx=session.beginTransaction();
session.save(transientInstance);
tx.commit();
session.close();
log.debug("save successful");
} catch (RuntimeException re) {
log.error("save failed", re);
throw re;
}
}
delete()方法用來刪除的 實(shí)際上我們會(huì)用下邊的這個(gè)方法進(jìn)行刪除
public void delete(Integer id){
log.debug("deleting User instance…");
User user=findById(id);
delete(user);
}
public void delete(User persistentInstance) {
log.debug("deleting User instance");
try {
Session session=getSession();
Transaction tx=session.beginTransaction();
session.delete(persistentInstance);
tx.commit();
session.close();
log.debug("delete successful");
} catch (RuntimeException re) {
log.error("delete failed", re);
throw re;
}
}
根據(jù)編號(hào)進(jìn)行查找
public User findById(java.lang.Integer id) {
log.debug("getting User instance with id: " + id);
try {
User instance = (User) getSession().get("hbm.User", id);
return instance;
} catch (RuntimeException re) {
log.error("get failed", re);
throw re;
}
}
findByExample()方法實(shí)現(xiàn)的功能相當(dāng)于"select * from Usertable"實(shí)現(xiàn)的功能就是查詢所有 數(shù)據(jù).
public List findByExample(User instance) {
log.debug("finding User instance by example");
try {
List results = getSession().createCriteria("hbm.User").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;
}
}
findByProperty()方法用來靈活的提供一種按條件查詢的方法,你可以自己定義要按什么樣的方 式查詢.
public List findByProperty(String propertyName, Object value) {
log.debug("finding User instance with property: " + propertyName
+ ", value: " + value);
try {
String queryString = "from User 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 findByName(Object name) {
return findByProperty(NAME, name);
}
public List findBySex(Object sex) {
return findByProperty(SEX, sex);
}
public List findByAge(Object age) {
return findByProperty(AGE, age);
}
public List findAll() {
log.debug("finding all User instances");
try {
String queryString = "from User";
Query queryObject = getSession().createQuery(queryString);
return queryObject.list();
} catch (RuntimeException re) {
log.error("find all failed", re);
throw re;
}
}
將傳入的detached狀態(tài)的對(duì)象的屬性復(fù)制到持久化對(duì)象中，并返回該持久化對(duì)象 如果該session中沒有關(guān)聯(lián)的持久化對(duì)象，加載一個(gè)，如果傳入對(duì)象未保存，保存一個(gè)副本并作為持久對(duì)象返回，傳入對(duì)象依然保持detached狀態(tài)。
可以用作更新數(shù)據(jù)
public User merge(User detachedInstance) {
log.debug("merging User instance");
try {
Session session=getSession();
Transaction tx=session.beginTransaction();
User result = (User) session.merge(detachedInstance);
tx.commit();
session.close();
log.debug("merge successful");
return result;
} catch (RuntimeException re) {
log.error("merge failed", re);
throw re;
}
}
將傳入的對(duì)象持久化并保存。 如果對(duì)象未保存（Transient狀態(tài)），調(diào)用save方法保存。如果對(duì)象已保存（Detached狀態(tài)），調(diào)用update方法將對(duì)象與Session重新關(guān)聯(lián)。
public void attachDirty(User instance) {
log.debug("attaching dirty User instance");
try {
getSession().saveOrUpdate(instance);
log.debug("attach successful");
} catch (RuntimeException re) {
log.error("attach failed", re);
throw re;
}
}
將傳入的對(duì)象狀態(tài)設(shè)置為Transient狀態(tài)
public void attachClean(User instance) {
log.debug("attaching clean User instance");
try {
getSession().lock(instance, LockMode.NONE);
log.debug("attach successful");
} catch (RuntimeException re) {
log.error("attach failed", re);
throw re;
}
}