Re: [Springframework-developer] Hibernate Dao implementation (idea)

[<jue...@we...>]

I don't really understand what you're trying to achieve.
=20
If you want to have a generic way to persist any sort of object, use a =
HibernateTemplate: The HibernateOperations interface that it implements =
specifies all sorts of generic data access operations for Hibernate. You =
can use HibernateTemplate directly in your business objects, effectively =
abandoning DAOs in your application.
=20
On the other hand, if you want to have DAOs with specific data access =
operations for a certain set of persistent objects, you should stick to =
a well-defined set of operations for those particular objects rather =
than offer all of Hibernate's data access operations. Well-defined =
persistent objects will offer specific query possibilities etc; their =
DAO interfaces will consequently use specific query parameters rather =
than general HQL strings.
=20
In essence, use HibernateTemplate directly for generic data access (any =
persistent object, any HQL string), and custom DAO implementations for =
specific data access (specific persistent objects, specific query =
parameters).
=20
Juergen
=20

________________________________

Von: spr...@li... im Auftrag =
von snpe
Gesendet: Do 06.05.2004 18:26
An: spr...@li...
Betreff: Re: [Springframework-developer] Hibernate Dao implementation =
(idea)



I have this error (methods with argument permanent object, not permanent =
class) : load, find work, but save, delete no)
Next version is tested and work all methods
I declare CatDaoImpl like  :
bean id=3D"catDao" =
class=3D"org.springframework.orm.hibernate.support.BaseHibernateDao">
                <property name=3D"sessionFactory"><ref =
local=3D"sessionFactory"/>
                </property>
                <property name=3D"clazz">
                        <value>eg.Cat</value>
                </property>
 </bean>

and use like
BaseHibernateDao catDao =3D (BaseHibernateDao) ctx.getBean("catDao");
List cats =3D (List) catDao.loadAll();
Long id =3D new Long(3);
Cat cat =3D (Cat) catDao.load(id);
etc
We can change Dao on the fly (baseDao haven't to have clazz property) :
BaseHibernateDao baseDao =3D (BaseHibernateDao) ctx.getBean("baseDao");
baseDao =3D  baseDao.setClazz(Dog.class);
List dogs =3D (List) baseDao.loadAll();
...

I can extends BaseHibernateDao and add new business methods (like =
Example Criteria)

It is possible exclude all named query method in helper class - it don't =
depends from permanent class

Regards

Code :


package org.springframework.orm.hibernate.support;

import java.io.Serializable;
import java.util.Collection;
import java.util.List;

import net.sf.hibernate.LockMode;
import net.sf.hibernate.type.Type;

import org.springframework.dao.DataAccessException;
import org.springframework.orm.hibernate.HibernateCallback;


public class BaseHibernateDao extends HibernateDaoSupport  implements =
IBaseHibernateDao {
      =20
        private Class clazz;
      =20
        public void delete(Object obj,LockMode lockMode)
                        throws DataAccessException {
                getHibernateTemplate().delete(obj,lockMode);
        }
        public void delete(Object obj) throws DataAccessException {
                getHibernateTemplate().delete(obj);
        }
        public void deleteAll(Collection entities) throws =
DataAccessException {
                getHibernateTemplate().deleteAll(entities);
        }
      =20
        public void evict(Object obj) throws DataAccessException {
                getHibernateTemplate().evict(obj);
        }
        public Object execute(HibernateCallback action) throws =
DataAccessException {
                return getHibernateTemplate().execute(action);
        }
      =20
        public List executeFind(HibernateCallback action)
                        throws DataAccessException {
                return getHibernateTemplate().executeFind(action);
        }
      =20
        public List find(String queryString, Type type)
                        throws DataAccessException {
                return =
getHibernateTemplate().find(queryString,clazz,type);
        }
      =20
        public List find(String queryString)
                        throws DataAccessException {
                return getHibernateTemplate().find(queryString,clazz);
        }
      =20
        public List find(String queryString, Object[] values, Type[] =
types)
                        throws DataAccessException {
                return =
getHibernateTemplate().find(queryString,values,types);
        }
      =20
        public List find(String queryString, Object[] values)
                        throws DataAccessException {
                return getHibernateTemplate().find(queryString,values);
        }
      =20
        public List findByNamedQuery(String queryName, Object value, =
Type type)
                        throws DataAccessException {
                return =
getHibernateTemplate().findByNamedQuery(queryName,value,type);
        }
        public List findByNamedQuery(String queryName, Object value)
                        throws DataAccessException {
                return =
getHibernateTemplate().findByNamedQuery(queryName,value);
        }
      =20
        public List findByNamedQuery(String queryName, Object[] values, =
Type[] types)
                        throws DataAccessException {
                return =
getHibernateTemplate().findByNamedQuery(queryName,values,types);
        }
      =20
        public List findByNamedQuery(String queryName, Object[] values)
                        throws DataAccessException {
                return =
getHibernateTemplate().findByNamedQuery(queryName,values);
        }
      =20
        public List findByNamedQuery(String queryName, String paramName,
                        Object value, Type type) throws =
DataAccessException {
                return =
getHibernateTemplate().findByNamedQuery(queryName,paramName,value,type);
        }
      =20
        public List findByNamedQuery(String queryName, String paramName,
                        Object value) throws DataAccessException {
                return =
getHibernateTemplate().findByNamedQuery(queryName,paramName, value);
        }
      =20
        public List findByNamedQuery(String queryName, String[] =
paramNames,
                        Object[] values, Type[] types) throws =
DataAccessException {
                return =
getHibernateTemplate().findByNamedQuery(queryName,paramNames, =
values,types);
        }
      =20
        public List findByNamedQuery(String queryName, String[] =
paramNames,
                        Object[] values) throws DataAccessException {
                return =
getHibernateTemplate().findByNamedQuery(queryName,paramNames, values);
        }
      =20
        public List findByNamedQuery(String queryName) throws =
DataAccessException {
                return =
getHibernateTemplate().findByNamedQuery(queryName);
        }
      =20
        public List findByNamedQueryAndValueBean(String queryName, =
Object valueBean)
                        throws DataAccessException {
                return =
getHibernateTemplate().findByNamedQueryAndValueBean(queryName,valueBean);=

        }
      =20
        public List findByValueBean(String queryString, Object =
valueBean)
                        throws DataAccessException {
                return =
getHibernateTemplate().findByValueBean(queryString,valueBean);
        }
      =20
        public Object get(Serializable id, LockMode lockMode)
                        throws DataAccessException {
                return getHibernateTemplate().get(clazz,id,lockMode);
        }
      =20
        public Object get( Serializable id)
                        throws DataAccessException {
                return getHibernateTemplate().get(clazz,id);
        }
      =20
        public Object load( Serializable id, LockMode lockMode)
                        throws DataAccessException {
                return getHibernateTemplate().load(clazz,id,lockMode);
        }
      =20
        public Object load(Serializable id)
                        throws DataAccessException {
                return getHibernateTemplate().load(clazz,id);
        }
      =20
        public List loadAll() throws DataAccessException {
                return getHibernateTemplate().loadAll(clazz);
        }
      =20
        public void lock(Object obj,LockMode lockMode)
                        throws DataAccessException {
                getHibernateTemplate().lock(obj,lockMode);
        }
      =20
        public void save(Object obj,Serializable id) throws =
DataAccessException {
                getHibernateTemplate().save(obj,id);
        }
      =20
        public Serializable save(Object obj) throws DataAccessException =
{
                return getHibernateTemplate().save(obj);
        }
      =20
        public void saveOrUpdate(Object obj) throws DataAccessException =
{
                 getHibernateTemplate().saveOrUpdate(obj);
        }
      =20
        public Object saveOrUpdateCopy(Object obj) throws =
DataAccessException {
                return getHibernateTemplate().saveOrUpdateCopy(obj);
        }
      =20
        public void update(Object obj,LockMode lockMode)
                        throws DataAccessException {
                getHibernateTemplate().update(obj,lockMode);
        }
      =20
        public void update(Object obj) throws DataAccessException {
                getHibernateTemplate().update(obj);
        }
      =20
        public BaseHibernateDao(Class clazz) {
                super();
                this.clazz =3D clazz;
        }
      =20
        public BaseHibernateDao () {
                super();
        }
      =20
        public Class getClazz() {
                return clazz;
        }
      =20
        public void setClazz(Class clazz) {
                this.clazz =3D clazz;
        }
}

/*
 * Created on May 6, 2004
 *
 */
package org.springframework.orm.hibernate.support;
import java.io.Serializable;
import java.util.Collection;
import java.util.List;
import net.sf.hibernate.LockMode;
import net.sf.hibernate.type.Type;
import org.springframework.dao.DataAccessException;
import org.springframework.orm.hibernate.HibernateCallback;
/**
 * @author Haris Peco
 *
 * Snpe Informacioni sistemi
 */
public interface IBaseHibernateDao {
        public abstract void delete(Object obj,LockMode lockMode) throws =
DataAccessException;
        public abstract void delete(Object Obj) throws =
DataAccessException;
        public abstract void deleteAll(Collection entities)
                        throws DataAccessException;
        public abstract void evict(Object obj) throws =
DataAccessException;
        public abstract Object execute(HibernateCallback action)
                        throws DataAccessException;
        public abstract List executeFind(HibernateCallback action)
                        throws DataAccessException;
        public abstract List find(String queryString, Type type)
                        throws DataAccessException;
        public abstract List find(String queryString) throws =
DataAccessException;
        public abstract List find(String queryString, Object[] values, =
Type[] types)
                        throws DataAccessException;
        public abstract List find(String queryString, Object[] values)
                        throws DataAccessException;
        public abstract List findByNamedQuery(String queryName, Object =
value,
                        Type type) throws DataAccessException;
        public abstract List findByNamedQuery(String queryName, Object =
value)
                        throws DataAccessException;
        public abstract List findByNamedQuery(String queryName, Object[] =
values,
                        Type[] types) throws DataAccessException;
        public abstract List findByNamedQuery(String queryName, Object[] =
values)
                        throws DataAccessException;
        public abstract List findByNamedQuery(String queryName, String =
paramName,
                        Object value, Type type) throws =
DataAccessException;
        public abstract List findByNamedQuery(String queryName, String =
paramName,
                        Object value) throws DataAccessException;
        public abstract List findByNamedQuery(String queryName,
                        String[] paramNames, Object[] values, Type[] =
types)
                        throws DataAccessException;
        public abstract List findByNamedQuery(String queryName,
                        String[] paramNames, Object[] values) throws =
DataAccessException;
        public abstract List findByNamedQuery(String queryName)
                        throws DataAccessException;
        public abstract List findByNamedQueryAndValueBean(String =
queryName,
                        Object valueBean) throws DataAccessException;
        public abstract List findByValueBean(String queryString, Object =
valueBean)
                        throws DataAccessException;
        public abstract Object get(Serializable id, LockMode lockMode)
                        throws DataAccessException;
        public abstract Object get(Serializable id) throws =
DataAccessException;
        public abstract Object load(Serializable id, LockMode lockMode)
                        throws DataAccessException;
        public abstract Object load(Serializable id) throws =
DataAccessException;
        public abstract List loadAll() throws DataAccessException;
        public abstract void lock(Object obj,LockMode lockMode) throws =
DataAccessException;
        public abstract void save(Object obj,Serializable id) throws =
DataAccessException;
        public abstract Serializable save(Object obj) throws =
DataAccessException;
        public abstract void saveOrUpdate(Object obj) throws =
DataAccessException;
        public abstract Object saveOrUpdateCopy(Object obj) throws =
DataAccessException;
        public abstract void update(Object obj,LockMode lockMode) throws =
DataAccessException;
        public abstract void update(Object obj) throws =
DataAccessException;
        public abstract Class getClazz();
        public abstract void setClazz(Class clazz);
}


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