基于 Open Jpa 的 GenericDao 的实现

IGenericDao  Class

public interface IGenericDao<T, ID extends Object> {   
  
    public T load(ID id) throws DataAccessException;   
  
    public T get(ID id) throws DataAccessException;   
  
    public boolean contains(T t) throws DataAccessException;   
  
    public void refresh(T t, LockMode lockMode) throws DataAccessException;   
  
    public void refresh(T t) throws DataAccessException;   
  
    public void save(T t) throws DataAccessException;   
  
    public void saveOrUpdate(T t) throws DataAccessException;   
  
    public void saveOrUpdateAll(Collection<T> entities) throws DataAccessException;   
  
    public void update(T t, LockMode lockMode) throws DataAccessException;   
  
    public void update(T t) throws DataAccessException;   
  
//    public void delete(T t, LockMode lockMode) throws DataAccessException;   
  
    public void delete(ID t) throws DataAccessException;   
  
    public void deleteAll(Collection<T> entities) throws DataAccessException;   
  
    public List<T> find(String queryString, Object value) throws DataAccessException;   
  
    public List<T> find(String queryString, Object[] values) throws DataAccessException;   
  
    public List<T> find(String queryString) throws DataAccessException;   
  
    public List<T> list() throws DataAccessException;   
  
//    public List<T> findByNamedQuery(String queryName) throws DataAccessException;   
//  
//    public List<T> findByNamedQuery(String queryName, Object value) throws DataAccessException;   
  
    public List<T> findByNamedQuery(String queryName, Object... values) throws DataAccessException;   
  
//    public PaginationSupport findPageByCriteria(final DetachedCriteria detachedCriteria, final int pageSize,   
//            final int startIndex);   
//  
//    public PaginationSupport findPageByQuery(final String hql, final String countHql, final int pageSize,   
//            final int startIndex);   
  
}  

JpaGenericDao  Class

import java.lang.reflect.ParameterizedType;
import java.util.Collection;
import java.util.List;

import org.hibernate.LockMode;
import org.springframework.dao.DataAccessException;
import org.springframework.orm.jpa.support.JpaDaoSupport;
@SuppressWarnings("unchecked")
public  class JPAGenericDao<T, ID extends Object> extends JpaDaoSupport implements IGenericDao<T, ID> {

	
    protected Class<T> entityClass;   
    
    public JPAGenericDao() {   
  
    }   
  
    protected Class getEntityClass() {   
        if (entityClass == null) {   
            entityClass = (Class<T>) ((ParameterizedType) getClass().getGenericSuperclass()).getActualTypeArguments()[0];   
            logger.debug("T class = " + entityClass.getName());   
        }   
        return entityClass;   
    } 
	public boolean contains(T t) throws DataAccessException {
		// TODO Auto-generated method stub
		return this.getJpaTemplate().contains(t);
	}

	public void delete(ID id) throws DataAccessException {
		// TODO Auto-generated method stub
        // 使用Query删除对象   
		this.getJpaTemplate().remove(this.getJpaTemplate().find(getEntityClass(), id));
 
	}


	public void deleteAll(Collection<T> entities) throws DataAccessException {
		// TODO Auto-generated method stub
       
	}

	public List<T> find(String queryString, Object value)
			throws DataAccessException {
		// TODO Auto-generated method stub
		return this.getJpaTemplate().find(queryString, value);
	}

	public List<T> find(String queryString, Object[] values)
			throws DataAccessException {
		// TODO Auto-generated method stub
		List<T> find = (List<T>)this.getJpaTemplate().find(queryString, values);
		return find;
	}

	public List<T> find(String queryString) throws DataAccessException {
		// TODO Auto-generated method stub
		List<T> find = (List<T>)this.getJpaTemplate().find(queryString);
		return find;
	}





	public T get(Object id) throws DataAccessException {
		// TODO Auto-generated method stub
		return null;
	}

	public List<T> list() throws DataAccessException {
		// TODO Auto-generated method stub
		
		return this.getJpaTemplate().getEntityManager().createQuery("select all from " + this.getEntityClass().getSimpleName() + " all ").getResultList();
 

		
	 }

	public T load(Object id) throws DataAccessException {
		// TODO Auto-generated method stub
		return (T)this.getJpaTemplate().find(this.getEntityClass(), id);
	}

	public void refresh(T t, LockMode lockMode) throws DataAccessException {
		// TODO Auto-generated method stub

	}

	public void refresh(T t) throws DataAccessException {
		// TODO Auto-generated method stub
        this.getJpaTemplate().refresh(t);
	}

	public void save(T t) throws DataAccessException {
		// TODO Auto-generated method stub
		this.getJpaTemplate().persist(t);
	}

	public void saveOrUpdate(T t) throws DataAccessException {
		// TODO Auto-generated method stub

	}

	public void saveOrUpdateAll(Collection entities) throws DataAccessException {
		// TODO Auto-generated method stub

	}

	public void update(T t, LockMode lockMode) throws DataAccessException {
		// TODO Auto-generated method stub

	}

	public void update(T t) throws DataAccessException {
		// TODO Auto-generated method stub
        this.getJpaTemplate().merge(t);
	}


	public List<T> findByNamedQuery(String queryName, Object... values)
			throws DataAccessException {
		// TODO Auto-generated method stub

		return (List<T>)this.getJpaTemplate().findByNamedQuery(queryName, values);

	}
	



}

具体实现类  MagazineDaoImpl 实现起来非常简单

public class MagazineDaoImpl extends JPAGenericDao<Magazine,Magazine.MagazineId> implements MagazineDao