java项目常用 BaseDao BaseService

package com.glht.sim.dao;

import java.util.List;

public interface IBaseDao<T> {
T get(long id);
void create(T t);
void delete(T t);
void update(T t);
int getTotalCount();
List<T>getPage(int startIndex,int count);
List<T> getAll();
}

package com.glht.sim.dao.impl;

import java.lang.reflect.ParameterizedType;
import java.sql.SQLException;
import java.util.List;

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.springframework.orm.hibernate3.HibernateCallback;
import org.springframework.orm.hibernate3.support.HibernateDaoSupport;

import com.glht.sim.dao.IBaseDao;

public abstract class BaseDao<T> extends HibernateDaoSupport implements IBaseDao<T> {
protected Class<T> entityClass;
protected String className;
public BaseDao(){
entityClass=(Class<T>)((ParameterizedType) getClass().getGenericSuperclass()).getActualTypeArguments()[0];
className=entityClass.getName();
}
public T get(long id){
return (T)this.getHibernateTemplate().get(entityClass, id);
}
public void create(T t){
this.getHibernateTemplate().save(t);
}
public void delete(T t){
this.getHibernateTemplate().delete(t);
}
public void update(T t){
this.getHibernateTemplate().update(t);
}

public int getTotalCount(){

Object obj=this.getHibernateTemplate().execute(new HibernateCallback(){
public Object doInHibernate(Session session)
throws HibernateException, SQLException{

return session.createQuery("select count(id) from "+className).uniqueResult();
}
});
return (int)((Long)obj).longValue();
}
public List<T>getPage(int startIndex,int count) {

return (List<T>)this.getHibernateTemplate().executeFind(
new PageHibernateCallback(
"from "+className+" as c order by c.id desc",startIndex,count));
}

public List<T> getAll(){
return (List<T>)this.getHibernateTemplate().find("from "+className+" as c order by c.id desc");
}
}

package com.glht.sim.service;

import java.util.List;

public interface IBaseService<T> {
T get(long id);
void create(T obj);

void delete(T obj);
void update(T obj);
int getTotalCount();
List<T> getPage(int startIndex,int count);
List<T> getAll();
}

package com.glht.sim.service.impl;

import java.util.List;

import com.glht.sim.dao.IBaseDao;
import com.glht.sim.service.IBaseService;

public abstract class BaseService<T> implements IBaseService<T> {
protected IBaseDao<T> dao;

public T get(long id){
return dao.get(id);
}

public void create(T obj){
dao.create(obj);
}

public void delete(T obj){
dao.delete(obj);
}
public void update(T obj){
dao.update(obj);
}

public int getTotalCount(){
return dao.getTotalCount();
}

public List<T> getPage(int startIndex,int count){
return dao.getPage(startIndex,count);
}

public List<T> getAll(){
return dao.getAll();
}

public void setDao(IBaseDao<T> dao) {
this.dao = dao;
}

}