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David1228 — Wed, 30 Oct 2019 06:10:00 GMT

blogjava�|�站与博客园合�ƈ了，对blogjava�q�是有感情的�?br />�q�且blogjava�|�站发布的文章是在博客园首页看不到的�?br />blogjava�|�站首页能看刎ͼ�你可以点��L��题进入可以看到图片二�l�码信息�?br />
Java爱好者社�?/strong>
公众号内容简介：
专注于分享Java后端相关技术、老司机实战干货，不限于JVM、�ƈ发、设计模式、性能优化、分布式&微服务、云原生、大数据相关主题�?/span>
希望��x��的你停下脚步�Q�定有所收获�?/span>

以前的个人博客内容不好迁�U�，所以我打算�Ҏ��自己的多�q�经验，不断整理输出有�h值的内容�?br />目前公众号内�Ҏ��关于SpringCloud�Q�微服务框架�Q�、Skywalking�Q�APM监控调用链）、JVM�Q�GC分析、内存泄漏分析）、�ƈ发编�E?/span>相关原创实战文章已出炉�?br />
最�q�刚开始已�l�有不少��伙伴关注了�Q�期待能有幸搜烦到本博客的同学，可以扫码��x��一下，不胜感激�?br />大家有�Q何技术、职场、面试上的问题都可以与我交流�?br />
方式一�Q?/strong>扫码以下公众号二�l�码�Q?/strong>

方式二：在微信上直接搜烦�Q?nbsp;javatech_cbo

感谢各位��伙伴的支持�Q�后�l�会在该公众号上输出大量的有价值的实战�q�货 �Q�期待与你一同进步与成长�?br />

David1228 2019-10-30 14:10 发表评论

Hibernate的HQL多表联合查询使用left join方式

David1228 — Thu, 12 Sep 2013 03:57:00 GMT
Hibernate不支持left join带on的条件查询�?br />解决办法�Q��用原生SQL或者��用HQL方式需要修改hbm文�g(如果��目中大部分不适用�U�联配置情况�?
需求是查询�|�络信息�Q�网�l�信息中兌��了分区、网�l�IP(1个网�l�－�Q�Ｎ个网�l�ﾃ�Q?�Q�网桥信�?
HQL�Q?br />
public void queryVnets(Page page) {
        StringBuffer hql = new StringBuffer();
        hql.append("select new Map(vn.id as id, vn.vnName as vnName, b.name as vnType, ");
        hql.append("vn.vnIptype as vnIptype, vn.vnIp as vnIp,vn.vnNat as vnNat, vn.vnFlag as vnFlag, ");
        hql.append("vn.vnetFlag as vnetFlag, (case when sum(vmvn.state)='0' then 0 else 1 end) as vnState, ");
        hql.append("vn.useType as useType, vn.createTime as createTime, ");
        hql .append("zone.oneName as oneName, zone.oneHypervisor as oneHypervisor, zone.oneSeq as oneSeq) ");
        hql.append("from VnetTable vn, ZoneTable zone, BridgeTable b ");
        hql.append("left join fetch vn.VnTables vmvn where zone.id = vn.zoneId and vn.vnType = b.id ");

... ...
        hql.append(" group by vn.id");
        if (vnState != null && !"".equals(vnState)) {
            if ("0".equals(vnState)) {
                hql.append(" having sum(vmvn.state)=0");
            } else if ("1".equals(vnState)) {
                hql.append(" having sum(vmvn.state)!=0");
            }
        }
    }

hbm配置文�g�Q?br />

"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

    <class name="com.base.mapping.VnetTable" table="vnet_table" >


            class="uuid.hex" />



                创徏虚拟�|�络时得到的ID


...


                分区ID




                VLAN_ID


  <set name="vnTables" lazy="false" order-by="id asc" inverse="false" fetch="join" cascade="all">

            class="com.base.mapping.VnTable"/>

    class>

理解inverse和cascade�Q�可以参考：http://blog.csdn.net/wkcgy/article/details/6271321
�ȝ��Q?nbsp;
中，��inverse=”true”�Q�由“many”�Ҏ��q�行兌��关系的维�?nbsp;
中，只设�|�其中一方inverse=”false”�Q�或双方都不讄��
Cascade�Q�通常情况下都不会使用。特别是删除�Q�一定要慎重�?/span>
操作��
  一般对many-to-one和many-to-many不设�|��联，�q�要看业务逻辑的需�?对one-to-one和one-to-many讄��U�联�?/span>
  many-to-many兌��关系中，一端设�|�inverse=”false”�Q�另一端设�|��ؓinverse=”true”。在one-to-many兌��关系中，讄��inverse=”true”,由多端来�l�护关系�?/span>

David1228 2013-09-12 11:57 发表评论

Mybatis3.2.1整合Spring3.1

David1228 — Wed, 10 Jul 2013 10:07:00 GMT
     摘要: �Ҏ��官方的说法，在ibatis3�Q�也��是Mybatis3问世之前�Q�Spring3的开发工作就已经完成了，所以Spring3中还是没有对Mybatis3的支持。因此由Mybatis�C�֌�自己开发了一个Mybatis-Spring用来满��Mybatis用户整合Spring的需求。下面就��通过Mybatis-Spring来整合Mybatis跟Spring的用法做一个简单的介绍。MapperFactoryB...  阅读全文

David1228 2013-07-10 18:07 发表评论

Hibernate 的悲观锁说明�Q�自己复习之用，转自http://blog.sina.com.cn/s/blog_49cc672f0100ar8h.html

David1228 — Thu, 17 Mar 2011 08:03:00 GMT

软�g�pȝ��的�ƈ发控制一般是通过加锁�Q�有乐观锁和悲观锁两�U�）来实玎ͼ�乐观锁是一�U�事后补救措施，是通过�E�序的逻辑控制版本来实现的�Q�而悲观锁是事前的一�U�预防措施，它利用数据库的锁机制来实现�?/p>
虽然乐观锁能够提高系�l�的性能�Q�但它是对发生冲�H�的讉K��q�行事后的补救，应用在用戯��入数据量很少的场合比较适合�Q�但如果在企�?a class="infotextkey" target="_blank">ERP�Q�用户与�pȝ��交互涉及大量数据在页面表单上录入�Q�如果事后提交失败后才提�C�用戯��重新录入是很不现实的�Q�所以有必要�q�行事前控制�Q�这��p��采用悲观锁�?br />
在多个客��L��可能��d��同一�W�数据或同时更新一�W�数据的情况下，防止同一个数据被修改而造成混�ؕ�Q�最��单的手段��是在读取时�Ҏ��据进行锁定，其它客户端不能对同一�W�数据进行更新的��d��动作�?/p>
一个典型的倚赖数据库的悲观锁调用：
select * from account where name=”John” for update

�q�条 sql 语句锁定�?account 表中所有符合检索条�Ӟ��name=”Erica”�Q�的记录。本�ơ事务提交之前（事务提交时会释放事务�q�程中的锁）�Q�外界无法修改这些记录。Hibernate 的悲观锁�Q�也是基于数据库的锁机制实现�?br /> 下面的代码实��C��Ҏ��询记录的加锁�Q?br /> String hqlStr ="from TUser as user where user.name='John'";
Query query = session.createQuery(hqlStr);
query.setLockMode("user",LockMode.UPGRADE); // 加锁
List userList = query.list();// 执行查询�Q�获取数�?/font>
query.setLockMode �Ҏ��询语句中�Q�特定别名所对应的记录进行加锁（我们为TUser �c�L��定了一个别�?“user” �Q�，�q�里也就是对�q�回的所�?user 记录�q�行加锁�?br /> 观察�q�行�?Hibernate 生成�?SQL 语句�Q?br /> select tuser0_.id as id, tuser0_.name as name, tuser0_.group_id
as group_id, tuser0_.user_type as user_type, tuser0_.sex as sex
from t_user tuser0_ where (tuser0_.name='John' ) for update
�q�里 Hibernate 通过使用数据库的 for update 子句实现了悲观锁机制�?br /> Hibernate 的加锁模式有�Q?br /> LockMode.NONE �Q?/strong> 无锁机制�?br /> LockMode.WRITE �Q?/strong> Hibernate �?Insert �?Update 记录的时候会自动获取�?br /> LockMode.READ �Q?/strong> Hibernate 在读取记录的时候会自动获取�?br /> 以上�q�三�U�锁机制一般由 Hibernate 内部使用�Q�如 Hibernate ��Z��保证 Update�q�程中对象不会被外界修改�Q�会�?save �Ҏ��实现中自动�ؓ目标对象加上 WRITE 锁�?br /> LockMode.UPGRADE �Q?/strong>利用数据库的 for update 子句加锁�?br /> LockMode. UPGRADE_NOWAIT �Q?/strong> Oracle 的特定实玎ͼ�利用 Oracle �?for update nowait 子句实现加锁�?br /> 上面�q�两�U�锁机制是我们在应用层较为常用的�Q�加锁一般通过以下�Ҏ��实现�Q?br /> Criteria.setLockMode
Query.setLockMode
Session.lock
注意�Q�只有在查询开始之前（也就�?Hiberate 生成 SQL 之前�Q�设定加锁，才会真正通过数据库的锁机制进行加锁处理，否则�Q�数据已�l�通过不包�?for update 子句�?Select SQL 加蝲�q�来�Q�所谓数据库加锁也就无从谈�v�?br />

David1228 2011-03-17 16:03 发表评论

David1228 — Mon, 16 Aug 2010 01:59:00 GMT
在Hibernate中，对象有三�U�状态：临时状态、持久状态和游离状态�?
      临时状�?/strong>�Q�当new一个实体对象后�Q�这个对象处于��时状态，卌��个对象只是一个保存��时数据的内存区域�Q�如果没有变量引用这个对象，则会被jre垃圾回收机制回收。这个对象所保存的数据与数据库没有�Q何关�p�，除非通过Session的save或者SaveOrUpdate把��时对象与数据库关联，�q�把数据插入或者更新到数据库，�q�个对象才�{换�ؓ持久对象�?nbsp;
        例如�Q�Emp e=new Emp();    //创徏临时对象
                e.setEmpno((long) 8888);
                e.setEName("mike");
                ...
                EmpDAO d=new EmpDAO();
                d.save(e);//持久�?nbsp;
                 ...

       持久状�?/strong>: 持久化对象的实例在数据库中有对应的记录，�q�拥有一个持久化表示�Q�ID�Q�。对持久化对象进行delete操作后，数据库中对应的记录将被删除，那么持久化对象与数据库记录不再存在对应关�p�，持久化对象变成��时状态�?nbsp;
        持久化对象被修改变更后，不会马上同步到数据库�Q�直到数据库事务提交。在同步之前�Q�持久化对象是脏的（Dirty�Q��?br />             例如�Q?nbsp;
              Emp e=new Emp(); //创徏了��时的对象
               EmpDAO edao= new empDAO();
               e=edao.findbyEmpno((long) 7786);    //使对象与数据库记录对应，从而持久化
               e.setEname("新的名字");                     //修改了持久化对象�Q��之处�?Dirty
               ......
               edao.saveorupdate(e);                      //保存�Q�但是仍�?Dirty
               tran.commit();                             //提交�Q�实��C��数据库同步，不再Dirty
               ......

       游离状�?/strong>�Q�当Session�q�行了Close、Clear或者evict后，持久化对象虽然拥有持久化标识�W�和与数据库对应记录一致的��|��但是因�ؓ会话已经消失�Q�对象不在持久化��理之内�Q�所以处于游��ȝ��态（也叫�Q�脱��状态）。游��ȝ��态的对象与��时状态对象是十分�怼�的，只是它还含有持久化标识�?/p>
          其中�Q�持久化状态的对象�Q�简�U�Cؓ�Q�PO
          而��时状态和游离状态的对象�Q�简�U�Cؓ�Q�VO

          1、通过get()或load()�Ҏ��得到的实例都是持久化状态的�?nbsp;
          2、当把session关闭�Ӟ��session�~�存中的持久化对象也变成游离�?/p>
             因关闭session而变成游��L��的可以通过lock、save、update变成持久�?nbsp;
          3、持久态实例可以通过调用delete()变成游离�?nbsp;
             而游��ȝ��态的实例可以通过调用lock()或者replicate()�q�行持久�?nbsp;
          4、save()和persist()��会引发SQL的insert�Q�delete()会引发SQL的delete
             update()或merge()会引发SQL的update�Q�对持久化实例的修改在刷新提交的时候会

            被检��到, 它会引发SQL的update
             saveOrUpdate()或者replicate ()会引发SQL的insert或者update

David1228 2010-08-16 09:59 发表评论

David1228 — Mon, 31 Aug 2009 08:26:00 GMT
     摘要: province_code-----Char(2) --》Character cert-----Clob �c�d�� ---》SerializableClob certstate------Number�c�d�� --》BigDecimal    usercode------Varchar2�c�d�� ---》String addtime ---...  阅读全文

David1228 2009-08-31 16:26 发表评论

HibernateDAO实现�c?查询List�Ҏ��

David1228 — Thu, 20 Aug 2009 05:37:00 GMT
public List getInfoList(CertInfoListView view) throws DAOException {
  List liinfo = new ArrayList();
  String sql="select b.usercode,b.agentcode,i.sn,i.cert,i.certstate,i.endtime, i.ipasskeyno,b.id,b.addtime from certbind b inner join certinfo i on b.ipasskeyno=i.ipasskeyno";
  Session session = HibernateTemplate.getInstance().getSession();
  StringBuffer sb = new StringBuffer(sql);
  sb.append(" where 1=1 ");
  if(!CheckEmpty.isEmpty(view.getIpasskeyno())){
   sb.append(" and i.ipasskeyno ='").append(view.getIpasskeyno()).append("'");
  }
  if(!CheckEmpty.isEmpty(view.getAgentcode())){
   sb.append(" and b.agentcode ='").append(view.getAgentcode()).append("'");
  }
  if(!CheckEmpty.isEmpty(view.getSn())){
   sb.append(" and i.sn ='").append(view.getSn()).append("'");
  }
  if(!CheckEmpty.isEmpty(view.getUsercode())){
   sb.append(" and b.usercode ='").append(view.getUsercode()).append("'");
  }
  if(view.getAddtime()!=null){
   sb.append(" and b.addtime=").append(view.getAddtime());
  }
  sb.append(" order by ipasskeyno ,addtime desc");
  Query q = session.createSQLQuery(sb.toString());
  int pageno = view.getPageno();
  int size = view.getPagesize();
  if(pageno!=0&&size!=0){
   q.setFirstResult((pageno-1)*size);
   q.setMaxResults(size);
  }
  List list = q.list();
  Iterator it = list.iterator();
  while(it.hasNext()){
   Object[] obj = (Object[])it.next();
   CertInfoListView c = new CertInfoListView();
   for(int i=0;i     if(!CheckEmpty.isEmpty((String)obj[0])){
     c.setUsercode((String)obj[0]);
    }
    if(!CheckEmpty.isEmpty((String)obj[1])){
     c.setAgentcode((String)obj[1]);
    }
    if(!CheckEmpty.isEmpty((String)obj[2])){
     c.setSn((String)obj[2]);
    }
    if(obj[3]!=null){
     SerializableClob sc = (SerializableClob)obj[3];
     String cc = null;
     if(sc!=null){
      try {
       cc = sc.getSubString(1, (int)sc.length());
      } catch (SQLException e) {
      }
     }
     if(cc!=null)c.setCert(cc);
    }
    if(obj[4]!=null){
     BigDecimal b = (BigDecimal)obj[4];
     c.setCertstate(b.intValue());
    }
    if((obj[5])!=null){
     c.setEndtime(((Date)obj[5]));
    }
    if(!CheckEmpty.isEmpty((String)obj[6])){
     c.setIpasskeyno((String)obj[6]);
    }
    c.setCertbindid(Integer.parseInt((String)obj[7]));
    c.setAddtime((Date)obj[8]);
   }
   liinfo.add(c);
  }
  if(session!=null&&session.isConnected())session.close();
  return liinfo;
}

实现分页的DAO
/*
* (non-Javadoc)
*
* @see com.cns.certservice.dao.CertBindTabDao#getCertBindList(com.cns.certservice.vo.CertBindView)
*/
public List getCertBindList(CertBindView view)
   throws DAOException {
  List li = null;
  List lic = null;
  Session session = null;
  try {
   session = HibernateTemplate.getInstance().getSession();
   Criteria cri = session.createCriteria(Certbind.class);
   Certbind c = getCertBind(view);
   if (c.getAddtime() != null) {
    cri.add(Expression.eq("addtime", c.getAddtime()));
   }
   if (!CheckEmpty.isEmpty(c.getAgentcode())) {
    cri.add(Expression.eq("agentcode", c.getAgentcode()));
   }
   if(c.getId()!=0)cri.add(Expression.eq("id", c.getId()));
   if (!CheckEmpty.isEmpty(c.getIpasskeyno())) {
    cri.add(Expression.eq("ipasskeyno", c.getIpasskeyno()));
   }
   if (!CheckEmpty.isEmpty(c.getUsercode())) {
    cri.add(Expression.eq("usercode", c.getUsercode()));
   }
   if (!CheckEmpty.isEmpty(c.getExtend1())) {
    cri.add(Expression.eq("extend1", c.getExtend1()));
   }
   if (!CheckEmpty.isEmpty(c.getExtend2())) {
    cri.add(Expression.eq("extend2", c.getExtend2()));
   }
   if (c.getAgenttype() != 0) {
    cri.add(Expression.eq("agenttype", c.getAgenttype()));
   }
   int pageno = view.getPageno();
   int size = view.getPagesize();
   if(pageno!=0&&size!=0){
    cri.setFirstResult((pageno-1)*size);
    cri.setMaxResults(size);
   }
   lic = cri.list();
   if (lic != null) {
    li = new ArrayList();
    for (Certbind cer : lic) {
     CertBindView v = getCertBindView(cer);
     li.add(v);
    }
   }

  } catch (HibernateException e) {
   log.error(e,e);
   throw new DAOException(e);
  }finally{
   if (session != null && session.isConnected())
    session.close();
  }
  return li;
}
public int getInfoListCount(CertBindView view) throws DAOException {
  int count = 0;
  Session session = null;
  try {
   session = HibernateTemplate.getInstance().getSession();
   Criteria cri = session.createCriteria(Certbind.class);
   Certbind c = getCertBind(view);
   if (c.getAddtime() != null) {
    cri.add(Expression.eq("addtime", c.getAddtime()));
   }
   if (!CheckEmpty.isEmpty(c.getAgentcode())) {
    cri.add(Expression.eq("agentcode", c.getAgentcode()));
   }
   if(c.getId()!=0)cri.add(Expression.eq("id", c.getId()));
   if (!CheckEmpty.isEmpty(c.getIpasskeyno())) {
    cri.add(Expression.eq("ipasskeyno", c.getIpasskeyno()));
   }
   if (!CheckEmpty.isEmpty(c.getUsercode())) {
    cri.add(Expression.eq("usercode", c.getUsercode()));
   }
   if (!CheckEmpty.isEmpty(c.getExtend1())) {
    cri.add(Expression.eq("extend1", c.getExtend1()));
   }
   if (!CheckEmpty.isEmpty(c.getExtend2())) {
    cri.add(Expression.eq("extend2", c.getExtend2()));
   }
   if (c.getAgenttype() != 0) {
    cri.add(Expression.eq("agenttype", c.getAgenttype()));
   }
   count = (Integer)cri.setProjection(Projections.rowCount()).uniqueResult();
   cri.setProjection(null);
  } catch (HibernateException e) {
   log.error(e,e);
   throw new DAOException(e);
  }finally{
   if (session != null && session.isConnected())
    session.close();
  }
  return count;
}

/*
* (non-Javadoc)
*
* @see com.cns.certservice.dao.CertBindTabDao#updateCertBind(com.cns.certservice.vo.CertBindView)
*/
public boolean updateCertBind(CertBindView view) throws DAOException {
  boolean res = false;
  if (view.getId()==0) {
   throw new DAOException("getId from CertBindView is null!");
  }
  Session session= null;
  try {
   session = HibernateTemplate.getInstance().getSession();
   Certbind c = (Certbind) session.get(Certbind.class, view.getId());
   if (!CheckEmpty.isEmpty(view.getAgentcode()))
    c.setAgentcode(view.getAgentcode());
   if (!CheckEmpty.isEmpty(view.getExtend1()))
    c.setExtend1(view.getExtend1());
   if (!CheckEmpty.isEmpty(view.getExtend2()))
    c.setExtend2(view.getExtend2());
   if (!CheckEmpty.isEmpty(view.getIpasskeyno()))
    c.setIpasskeyno(view.getIpasskeyno());
   if (!CheckEmpty.isEmpty(view.getUsercode()))
    c.setUsercode(view.getUsercode());
   if (view.getAgenttype() != 0)
    c.setAgenttype(view.getAgenttype());
   res = HibernateTemplate.getInstance().updateObject(c);
  } catch (HibernateException e) {
   log.error(e,e);
   throw new DAOException(e);
  }finally{
   if (session != null && session.isConnected())
    session.close();
  }
  return res;
}

private Certbind getCertBind(CertBindView view) {
  Certbind c = new Certbind();
  if (view.getAddtime() != null)
   c.setAddtime(view.getAddtime());
  if (!CheckEmpty.isEmpty(view.getAgentcode()))
   c.setAgentcode(view.getAgentcode());
  if (!CheckEmpty.isEmpty(view.getExtend1()))
   c.setExtend1(view.getExtend1());
  if (!CheckEmpty.isEmpty(view.getExtend2()))
   c.setExtend2(view.getExtend2());
  if (!CheckEmpty.isEmpty(view.getIpasskeyno()))
   c.setIpasskeyno(view.getIpasskeyno());
  if (!CheckEmpty.isEmpty(view.getUsercode()))
   c.setUsercode(view.getUsercode());
  if(view.getId()!=0)c.setId(view.getId());
  if (view.getAgenttype() != 0)
   c.setAgenttype(view.getAgenttype());
  return c;
}

private CertBindView getCertBindView(Certbind view) {
  CertBindView c = new CertBindView();
  if (view.getAddtime() != null)
   c.setAddtime(view.getAddtime());
  if (!CheckEmpty.isEmpty(view.getAgentcode()))
   c.setAgentcode(view.getAgentcode());
  if (!CheckEmpty.isEmpty(view.getExtend1()))
   c.setExtend1(view.getExtend1());
  if (!CheckEmpty.isEmpty(view.getExtend2()))
   c.setExtend2(view.getExtend2());
  if (!CheckEmpty.isEmpty(view.getIpasskeyno()))
   c.setIpasskeyno(view.getIpasskeyno());
  if (!CheckEmpty.isEmpty(view.getUsercode()))
   c.setUsercode(view.getUsercode());
  if(view.getId()!=0)c.setId(view.getId());
  if (view.getAgenttype() != 0)
   c.setAgenttype(view.getAgenttype());
  return c;
}

David1228 2009-08-20 13:37 发表评论

HibernateTemplate增改删查�Ҏ��

David1228 — Thu, 20 Aug 2009 05:22:00 GMT

package com.cns.certservice.dao.impl;

import org.apache.log4j.Logger;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.cfg.Configuration;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;

import com.cns.certservice.exception.DAOException;

public class HibernateTemplate {

    private HibernateTemplate() {

    }

    /**
     * static final session factory
     */
    private static SessionFactory sessionFactory = null;

    /**
     * local thread variable used for storing share session instance
     */
    private static final ThreadLocal localSession = new ThreadLocal();

    /**
     * log4j logger
     */
    private static final Logger logger = Logger
            .getLogger(HibernateTemplate.class);
    /**
     * use JTA transaction
     */
    /**
     * 该工具唯一实例�?br />      */
    private static HibernateTemplate instance = null;
    private static Transaction tx = null;
    private static String CONFIG_FILE_LOCATION = "/hibernate.cfg.xml";
    private static final Configuration cfg = new Configuration();
    /** Holds a single instance of Session */
    private static final ThreadLocal threadLocal = new ThreadLocal();

    /**
     * 获取持久工具的唯一实例�Q�以后不是��用单实例模式�Q�而不是采用对象池支持�?br />      * @return　PersistentTool
     * @throws BaseException
     */
    public synchronized static HibernateTemplate getInstance() {
        if (instance == null) {
            instance = new HibernateTemplate();
            instance.initHibernate();
        }
        return instance;
    }

    /**
     * 实现Hibernate的初始化配置环境�?br />      */
    public void initHibernate() {
        try {
            //此处从系�l��\径中获取配置文�g
            cfg.configure(CONFIG_FILE_LOCATION);
        } catch (HibernateException ex) {
            ex.printStackTrace();
        }
        try {
            // 装蝲配置�Q�构造SessionFactory对象
            sessionFactory = cfg.buildSessionFactory();
        } catch (HibernateException e) {
            e.printStackTrace();
        }
    }

    /**
     * Get the share session
     * @
     * @return Session share session
     */
    public Session getSession() {
        logger.debug("Now enter into getSession method of DaoUtil");
        //obtain share session
        Session session = (Session) localSession.get();
        try {
            if (session == null||!session.isOpen()) {
                //get session by session factory
                session = sessionFactory.openSession();
                localSession.set(session);
            }
        } catch (HibernateException ex) {
            ex.printStackTrace();

        }
        return session;
    }

    /**
     * Close share session
     * @
     */
    public void close() {
        logger.debug("Now enter into closeSessionl");
        //obtain share session
        Session session = (Session) localSession.get();
        localSession.set(null);
        if (session != null) {
            try {
                session.flush();
                session.close();
            } catch (HibernateException ex) {
                ex.printStackTrace();

            }
        }
    }

    /**
     * Begin JTA transaction
     * @
     */
    public void beginTransaction() {
        logger.debug("Now enter into beginTransaction");
        try {
            Session session = (Session) localSession.get();
            tx = session.beginTransaction();
        } catch (Exception ex) {
            ex.printStackTrace();

        }
    }

    /**
     * Commit transaction
     * @
     */
    public void commitTransaction() {
        try {
            tx.commit();
        } catch (Exception ex) {
            ex.printStackTrace();

        }
    }

    /**
     * Rollback transaction when breaching ACID operation
     * @
     */
    public void rollbackTransaction() {
        try {
            tx.rollback();
        } catch (Exception ex) {
            ex.printStackTrace();

        }
    }

    /**
     * Insert a record into table
     * @param obj Object
     * @throws DAOException
     * @
     */
    public int insertObject(Object obj) throws DAOException {
    int res = 0;
        logger.debug("Now enter into insertObject");
        //obtain current share session
        try {
            Session session = HibernateTemplate.getInstance().getSession();
            beginTransaction();
            Object robj = session.save(obj);
            if (robj instanceof Integer) {
    res = (Integer) robj;
   }
            if (robj instanceof String) {
    res =1;
   }
            session.flush();
        } catch (HibernateException ex) {
            rollbackTransaction();
            logger.error("insertObject error:", ex);
            throw new DAOException(ex);
        } finally {
            commitTransaction();
            close();
        }
        return res;
    }

    /**
     * Delete a record of database table by Hibernate po object
     * @param obj Object
     * @throws DAOException
     * @
     */
    public boolean deleteObject(Object obj) throws DAOException {
    boolean res = false;
        logger.debug("Now enter into deleteObject method");
        //obtain current share session
        try {
            Session session = HibernateTemplate.getInstance().getSession();
            beginTransaction();
            session.delete(obj);
            session.flush();
            res = true;
        } catch (HibernateException ex) {
            rollbackTransaction();
            logger.error("deleteObject error:", ex);
            throw new DAOException(ex);
        } finally {
            commitTransaction();
            close();
        }
        return res;
    }

    /**
     * Update a record of database table
     * @param ob Object
     * @throws DAOException
     * @
     */
    public boolean updateObject(Object ob) throws DAOException {
    boolean res = false;
        logger.debug("Now enter into updateObject");
        //obtain current share session
        try {
            Session session = HibernateTemplate.getInstance().getSession();
            beginTransaction();
            session.update(ob);
            session.flush();
            res= true;
        } catch (HibernateException ex) {
        rollbackTransaction();
        logger.error("updateObject error:", ex);
        throw new DAOException(ex);
        } finally {
            commitTransaction();
            close();
        }
        return res;
    }
}

David1228 2009-08-20 13:22 发表评论

struts1+hibernate分页例子

David1228 — Mon, 17 Aug 2009 07:15:00 GMT
http://www.tkk7.com/wujun/archive/2009/05/18/65890.html

David1228 2009-08-17 15:15 发表评论

Hibernate创徏数据库表�Q�一对一and一对多�Q?

David1228 — Mon, 15 Dec 2008 07:44:00 GMT
    只有注册用户��d��后才能阅读该文�?a href='http://www.tkk7.com/ldwblog/archive/2008/12/15/246428.html'>阅读全文

David1228 2008-12-15 15:44 发表评论