终于搞定关于Hibernte的Blob更新操作

看了N多的文档,都是一样的,不理解,完全是网络转载,一点不负责任.所以我把我的完整代码贴如下:

sql: ============================================

create table T_ZP
(
  ID      NUMBER not null,
  RYBH    VARCHAR2(21),
  ZPXH    NUMBER,
  PIC     BLOB,
  OPTIME  DATE not null,
  DELFLAG CHAR(1) not null
)
============================================

bea和hbm.xml就不用写了吧!先看DAO方法:

 

package com.sclh.hibernate.dao;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.sql.SQLException;
import java.util.Iterator;
import java.util.List;

import oracle.sql.BLOB;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.hibernate.Hibernate;
import org.hibernate.HibernateException;
import org.hibernate.LockMode;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.Transaction;
import org.hibernate.lob.SerializableBlob;

import com.sclh.common.GetTime;
import com.sclh.hibernate.bean.Zp;

/** *//**
 * Data access object (DAO) for domain model class Zp.
 * 
 * @see .Zp
 * @author MyEclipse - Hibernate Tools
 */
public class ZpDAO extends BaseHibernateDAO ...{

    private static final Log log = LogFactory.getLog(ZpDAO.class);

    public void delete(Zp persistentInstance) ...{
        log.debug("deleting Zp instance");
        try ...{
            getSession().delete(persistentInstance);
            log.debug("delete successful");
        } catch (RuntimeException re) ...{
            log.error("delete failed", re);
            throw re;
        }
    }

    public boolean saveZp(Zp entity, String filePath) throws IOException ...{
        log.debug("saveZp " + entity.getClass().getName() + " instance");
        boolean opFlag = false;
        String idFlag = "";
        InputStream in = null;
        Session session = null;
        Transaction tx = null;
        Integer id = null;
        try ...{
            session = getSession();
            Zp zp = new Zp();
            Zp zp1 = new Zp();
            /**//* id的判断 */
            Query query = session.createQuery("from Zp where delflag ='1'");
            Iterator iterator = query.iterate();
            while (iterator.hasNext()) ...{
                zp1 = (Zp) iterator.next();
                System.out.println("while ->照片Rybh:" + zp.getRybh());
                if (entity.getRybh().equals(zp1.getRybh())
                        && entity.getZpxh().equals(zp1.getZpxh())) ...{
                    idFlag = "1";
                    System.out.println("该人员有原始相片!");
                    update(entity, filePath);
                    break;
                }
            }
            if (idFlag.equals("")) ...{
                save(entity, filePath);
            }
        } finally ...{
            session.close();
        }
        return opFlag;
    }

    public boolean save(Zp entity, String filePath) throws IOException ...{
        boolean opFlag = false;
        InputStream in = null;
        Session session = null;
        Transaction tx = null;
        Integer id = null;
        try ...{
            session = getSession();
            tx = session.beginTransaction();
            Query query = session.createQuery("select max(zp.id) from Zp zp");
            List zpList = query.list();
            Iterator iterator = query.iterate();

            Integer integerId = (Integer) iterator.next();
            System.out.println("id:" + integerId.toString());
            int intId = (integerId.intValue()) + 1;
            entity.setId(new Integer(intId));
            System.out.println("照片id:" + entity.getId());

            entity.setRybh(entity.getRybh());
            entity.setPic(Hibernate.createBlob(new byte[1]));
            entity.setZpxh(entity.getZpxh());
            entity.setOptime(GetTime.getSystemTime());
            entity.setDelflag("1");

            session.save(entity);
            session.flush();
            session.refresh(entity, LockMode.UPGRADE);
            SerializableBlob blob = (SerializableBlob) entity.getPic();
            java.sql.Blob wrapBlob = blob.getWrappedBlob();
            BLOB tmpBlob = (BLOB) wrapBlob;

            OutputStream out = tmpBlob.getBinaryOutputStream();

            FileInputStream image = new FileInputStream(filePath);
            byte[] buf = new byte[1024000];
            int len = 0;
            while ((len = image.read(buf)) > 0) ...{
                (out).write(buf, 0, len);
            }
            image.close();
            out.close();

            Zp zp2 = (Zp) session.load(Zp.class, entity.getId());
            session.flush();
            tx.commit();
        } catch (HibernateException e) ...{
            throw e;
        } catch (SQLException e) ...{
            e.printStackTrace();
            log.error(e.getMessage());
        } finally ...{
            if (tx != null) ...{
                tx.rollback();
            }
            session.close();
        }

        return opFlag;
    }

    public boolean update(Zp entity, String filePath) throws IOException ...{
        boolean opFlag = false;
        String idFlag = "";
        InputStream in = null;
        Session session = null;
        Transaction tx = null;
        Integer id = null;
        try ...{
            session = getSession();
            tx = session.beginTransaction();

            Zp oldZp = (Zp) session.load(Zp.class, entity.getId(),
                    LockMode.UPGRADE);
            oracle.sql.BLOB blob_empty = oracle.sql.BLOB.empty_lob();
            oldZp.setPic(blob_empty);
            session.flush();
            session.refresh(oldZp, LockMode.UPGRADE);

            oldZp.setId(new Integer(3));
            oldZp.setRybh(entity.getRybh());
            oldZp.setPic(Hibernate.createBlob(new byte[1]));
            oldZp.setZpxh(entity.getZpxh());
            oldZp.setOptime(GetTime.getSystemTime());
            oldZp.setDelflag("1");

            session.update(oldZp);
            session.flush();
            session.refresh(oldZp, LockMode.UPGRADE);
            SerializableBlob blob = (SerializableBlob) oldZp.getPic();
            java.sql.Blob wrapBlob = blob.getWrappedBlob();
            BLOB tmpBlob = (BLOB) wrapBlob;

            OutputStream out = tmpBlob.getBinaryOutputStream();
            FileInputStream image = new FileInputStream(filePath);
            byte[] buf = new byte[1024000];
            int len = 0;
            while ((len = image.read(buf)) > 0) ...{
                (out).write(buf, 0, len);
            }
            image.close();
            out.close();

            Zp zp2 = (Zp) session.load(Zp.class, oldZp.getId());
            session.flush();
            tx.commit();
        } catch (HibernateException e) ...{
            throw e;
        } catch (SQLException e) ...{
            e.printStackTrace();
            log.error(e.getMessage());
        } finally ...{
            if (tx != null) ...{
                tx.rollback();
            }
            session.close();
        }

        return opFlag;
    }

}

  方法的使用说明,我研究准确了,再附上!