basedao.java

来自「开源项目CRM之OpenCustomer」· Java 代码 · 共 187 行

/*******************************************************************************
 * ***** BEGIN LICENSE BLOCK Version: MPL 1.1
 * 
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with the
 * License. You may obtain a copy of the License at http://www.mozilla.org/MPL/
 * 
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
 * the specific language governing rights and limitations under the License.
 * 
 * The Original Code is the OpenCustomer CRM.
 * 
 * The Initial Developer of the Original Code is Thomas Bader (Bader & Jene
 * Software-Ingenieurb黵o). Portions created by the Initial Developer are
 * Copyright (C) 2005 the Initial Developer. All Rights Reserved.
 * 
 * Contributor(s): Thomas Bader <[e-mail]>
 * 
 * ***** END LICENSE BLOCK *****
 */

package org.opencustomer.db.dao;

import java.util.List;

import org.apache.log4j.Logger;
import org.hibernate.HibernateException;
import org.hibernate.Transaction;
import org.opencustomer.db.vo.BaseVO;

/**
 * @author chaenderl
 * 
 */
public abstract class BaseDAO<E extends BaseVO> extends AbstractDAO
{
    private static final Logger log = Logger.getLogger(BaseDAO.class);

    public BaseDAO() throws HibernateException
    {
        super();
    }

    public void insert(E entity) throws HibernateException
    {
        if (log.isDebugEnabled())
            log.debug("Try to insert entity: " + entity.toString());

        Transaction tx = null;

        try
        {
            tx = this.session.beginTransaction();

            this.session.save(entity);

            tx.commit();
        }
        catch (HibernateException e)
        {
            if (tx != null)
                tx.rollback();
            log.error("Could not store the object: " + entity.toString(), e);
            throw e;
        }
    }

    public void update(E entity) throws HibernateException
    {
        if (log.isDebugEnabled())
            log.debug("Try to update object: " + entity.toString());

        Transaction tx = null;

        try
        {
            tx = this.session.beginTransaction();

            this.session.update(entity);

            tx.commit();
        }
        catch (HibernateException e)
        {
            if (tx != null)
                tx.rollback();
            log.error("Could not update the object: " + entity.toString(), e);
            throw e;
        }
    }

    public void insertOrUpdate(E entity) throws HibernateException
    {
        if (log.isDebugEnabled())
            log.debug("Try to insert/update object: " + entity.toString());

        Transaction tx = null;

        try
        {
            tx = this.session.beginTransaction();

            this.session.saveOrUpdate(entity);

            tx.commit();
        }
        catch (HibernateException e)
        {
            if (tx != null)
                tx.rollback();
            log.error("Could not store the object: " + entity.toString(), e);
            throw e;
        }
    }

    public void delete(E entity) throws HibernateException
    {
        if (log.isDebugEnabled())
            log.debug("Try to delete object: " + entity.toString());

        Transaction tx = null;

        try
        {
            tx = this.session.beginTransaction();

            this.session.delete(entity);

            tx.commit();
        }
        catch (HibernateException e)
        {
            if (tx != null)
                tx.rollback();
            log.error("Could not delete the object: " + entity.toString(), e);
            throw e;
        }
    }

    protected abstract Class getEntityClass();

    public E getById(Integer id) throws HibernateException
    {
        E entity = null;

        try
        {
            entity = (E) this.session.get(getEntityClass(), id);

            if (entity == null)
                throw new HibernateException("entity not found");
        }
        catch (HibernateException e)
        {
            log.error("Could not get object by id '" + id.toString() + "'", e);
            throw e;
        }

        return entity;
    }

    public List<E> getAll() throws HibernateException
    {
        List<E> l = null;
        try
        {
            StringBuffer hql = new StringBuffer();
            hql.append(" FROM ").append(getEntityClass().getName()).append(" e ");

            l = toTypeSafeList(this.session.createQuery(hql.toString()).list());
        }
        catch (HibernateException e)
        {
            log.error("Could not get all objects", e);
            throw e;
        }

        return l;
    }

    protected List<E> toTypeSafeList(List list)
    {
        return (List<E>) list;
    }
}