BlogJava-Skynet-随笔分类-hibernate

spring 与 hibernate 整合(事务)

G_G — Fri, 09 May 2008 05:47:00 GMT

参考：第 9 章事务管理 - Spring Framework reference 2.0.5 参考手册中文版
http://doc.javanb.com/spring-framework-reference-zh-2-0-5/ch09.html

先从配置文件开始：
源码：springAop.rar

需要jar

xml version="1.0" encoding="UTF-8"?>
<classpath>
    <classpathentry kind="src" path="java"/>
    <classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
    <classpathentry kind="lib" path="lib/aspectjrt.jar"/>
    <classpathentry kind="lib" path="lib/aspectjweaver.jar"/>
    <classpathentry kind="lib" path="lib/spring.jar"/>
    <classpathentry kind="lib" path="lib/spring-sources.jar"/>
    <classpathentry kind="lib" path="lib/commons-logging-1.0.4.jar"/>
    <classpathentry kind="lib" path="lib/cglib-nodep-2.1_3.jar"/>
    <classpathentry kind="lib" path="lib/hibernate3.jar"/>
    <classpathentry kind="lib" path="lib/log4j-1.2.11.jar"/>
    <classpathentry kind="con" path="org.eclipse.jdt.junit.JUNIT_CONTAINER/4"/>
    <classpathentry kind="lib" path="lib/dom4j-1.6.1.jar"/>
    <classpathentry kind="lib" path="lib/commons-collections-2.1.1.jar"/>
    <classpathentry kind="lib" path="lib/mysql.jar"/>
    <classpathentry kind="lib" path="lib/jta.jar"/>
    <classpathentry kind="lib" path="lib/antlr-2.7.6.jar"/>
    <classpathentry kind="output" path="bin"/>
classpath>

spring 配置

xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="
       http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
       http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.0.xsd
       http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsd">



  <bean id="beanDao" class="dao.imp.BeanDaoImp">
      <property name="sessionFactory">
          <ref bean="sessionFactory">ref>
      property>
  bean>



   <bean id="sessionFactory"
        class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">

       <property name="configLocation" value="classpath:hibernate.cfg.xml" />
   bean>


   <aop:config>

         <aop:pointcut id="aopBean" expression="execution(* *.*.*(..))"/>
           <aop:advisor advice-ref="txAdvice" pointcut-ref="aopBean" />
      aop:config>


       <bean id="txManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
      <property name="sessionFactory" ref="sessionFactory" />
    bean>


      <tx:advice id="txAdvice" transaction-manager="txManager">
           <tx:attributes>
             <tx:method name="get*" read-only="true"/>
          <tx:method name="*" />
        tx:attributes>
      tx:advice>

beans>

hibernate 配置

xml version="1.0" encoding="UTF-8"?>
DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory name="asdf">
    <property name="hibernate.dialect">mysqlproperty>
    <property name="myeclipse.connection.profile">
        com.mysql.jdbc.Driver
    property>
    <property name="connection.url">
        jdbc:mysql://localhost/aop
    property>
    <property name="show_sql">trueproperty>

    <property name="connection.username">rootproperty>
    <property name="connection.password">property>
    <property name="connection.driver_class">
        com.mysql.jdbc.Driver
    property>
    <property name="dialect">
        org.hibernate.dialect.MySQLDialect
    property>

    <mapping resource="bean/UnitBean.hbm.xml" />

session-factory>
hibernate-configuration>

dao 类（接口）

package dao.imp;

import java.util.List;

import org.springframework.orm.hibernate3.support.HibernateDaoSupport;

import bean.UnitBean;

import dao.BeanDao;

public class BeanDaoImp extends HibernateDaoSupport implements BeanDao{
    public void addBean(UnitBean unitBean) {
        this.getHibernateTemplate().save(unitBean);
    }

    public List<UnitBean> getBeanByAll() {
        return this.getHibernateTemplate().find(" from "+UnitBean.class.getName());
    }

    public void removeBean(long beanId) {
        this.getHibernateTemplate().delete(
                getHibernateTemplate().get(UnitBean.class, beanId)
            );
    }

}

Main 类

package unit;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import dao.BeanDao;
import bean.UnitBean;

public class Main {
    public static void main(String[] args) {
           ApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");
           BeanDao dao = (BeanDao) ctx.getBean("beanDao");
           UnitBean bean = new UnitBean();
           bean.setName("xx");
           bean.setPass("11");
           dao.addBean(bean);

           for(UnitBean unitBean : dao.getBeanByAll() ){
               System.out.println( unitBean.getId() );
           }

           dao.removeBean(bean.getId());

    }
}

结果：
Hibernate: insert into bean (name, pass) values (?, ?)
Hibernate: select unitbean0_.id as id0_, unitbean0_.name as name0_, unitbean0_.pass as pass0_ from bean unitbean0_
1
Hibernate: select unitbean0_.id as id0_0_, unitbean0_.name as name0_0_, unitbean0_.pass as pass0_0_ from bean unitbean0_ where unitbean0_.id=?
Hibernate: delete from bean where id=?

G_G 2008-05-09 13:47 发表评论

Hibernate 数据结构（树、多对多结构表示）

G_G — Sat, 26 Apr 2008 10:30:00 GMT

摘要: level 类：Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->package hbm;import java.util.Set;/** * @hibernate.class table = "level" * where = " visible = ... 阅读全文

G_G 2008-04-26 18:30 发表评论

Hibernate 级联添加删除

G_G — Wed, 02 Apr 2008 02:07:00 GMT

问题描述：实体类答案从属于实体类问题。（一对多）
效果-》

    /**
     * 添加问题和选项
     * @throws Exception
     */@Test
    public void testQu() throws Exception {
        Session session = HibernateUtil.currentSession();
        Transaction tr = session.beginTransaction();

        //级联添加
        Set options = new HashSet();
        Options op1 = new Options();
        op1.setName("op1");
        options.add(op1);


        Options op2 = new Options();
        op2.setName("op2");
        options.add(op2);


        Options op3 = new Options();
        op3.setName("op3");
        options.add(op3);
        Problems problems = new Problems();

        problems.setName("problem_1");
        problems.setOptions(options);
        problems.setTdesc("tdesc");
        problems.setType(1);

        Long ll = (Long)session.save(problems);


        System.out.println(ll);
        tr.commit();

mysql> select * from options ;
+----+------------+--------+------+---------+
| id | problemsid | answer | name | visible |
+----+------------+--------+------+---------+
| 1 |          1 |   NULL | op2 |       0 |
| 2 |          1 |   NULL | op3 |       0 |
| 3 |          1 |   NULL | op1 |       0 |
+----+------------+--------+------+---------+
3 rows in set (0.00 sec)

mysql> select * from problems ;
+----+-----------+------+-------+------------+---------+
| id | name      | type | tdesc | questionid | visible |
+----+-----------+------+-------+------------+---------+
| 1 | problem_1 |    1 | tdesc |       NULL |       0 |
+----+-----------+------+-------+------------+---------+
1 row in set (0.00 sec)


        //级联删除
        tr.begin();
            session.delete( session.get(Problems.class,ll) );
        tr.commit();

mysql> select * from problems ;
Empty set (0.00 sec)

mysql> select * from options ;
Empty set (0.00 sec)

        HibernateUtil.closeSession();
    }

Options类

.......
    /**
     * @hibernate.many-to-one
     *         cascade = "save-update"
     *         column = "Problemsid"
     *         class = "com.zhongqi.domain.Problems"
     * @return
     */
    public Problems getProblems() {
        return problems;
    }
............

Problems 类

    /**
     * @hibernate.set
     *         cascade="all-delete-orphan"
     *         inverse = "false"
     *         lazy = "true"
     *         @hibernate.collection-key  column = "problemsid"
     *         @hibernate.collection-one-to-many class = "com.zhongqi.domain.Options"
     * @return
     */
    public Set getOptions() {
        return options;
    }

G_G 2008-04-02 10:07 发表评论

mysql Blob hbn 操作

G_G — Mon, 28 Jan 2008 01:53:00 GMT

1.数据库

2.代码

        //插入
        Session sess =  HibernateSessionFactory.getSession();
        Transaction tr = sess.beginTransaction();
        LotteryNew nn = new LotteryNew();
        nn.setInputTime(new Date());
        nn.setCategories("t");
        nn.setTitle("new");
        nn.setRecommended(true);
        Blob bo = Hibernate.createBlob("ggggg".getBytes());
        nn.setContent(bo);
        sess.save(nn);
        tr.commit();
        HibernateSessionFactory.closeSession();

        //修改
        sess =  HibernateSessionFactory.getSession();
        tr = sess.beginTransaction();
        LotteryNew lo = (LotteryNew) sess.get(LotteryNew.class, nn.getId());
        Blob bog = Hibernate.createBlob("xxxxx".getBytes());
        lo.setContent(bog);
        tr.commit();
        HibernateSessionFactory.closeSession();

        //查找
        sess =  HibernateSessionFactory.getSession();
        LotteryNew lo2 = (LotteryNew) sess.get(LotteryNew.class, lo.getId());
        InputStream in = lo2.getContent().getBinaryStream() ;
        byte[] bbr = new byte[in.available()];
        in.read(bbr);
        System.out.println(new String(bbr));
        HibernateSessionFactory.closeSession();

G_G 2008-01-28 09:53 发表评论

hbn 继承关系映射_1

G_G — Wed, 26 Dec 2007 03:41:00 GMT

摘要: 尝试着继承关系和xdoclet使用后，对数据库面向对象的使用更近一步。这次例子从开始到结束，都没有接触面向结构的数据库设计；并完全在代码中以面向对象的形式来设计的。hbn 的继承映射关系有这几种；继承关系类共同使用一个表；每个子类一个表(mapping全)；每个具体内一个表（mapping只有父类）。先说说3把，感觉这点最好用-》》继承关系描述： Animals父类 -- Bird ... 阅读全文

G_G 2007-12-26 11:41 发表评论

hibernate + Myeclipes 敏捷(小例)

G_G — Tue, 11 Dec 2007 09:51:00 GMT

对hbn深入过程中，发现开发和设计持久层到项目后期，越来越困难。在次仔细查分析。特总结一种开发方法。留下与大家分享，欢迎拍砖。

开发过程描述：
1.使用 MyEclipes -> uml 创建类图
2.用 Generate java Code 根据类图生成 java文件
3.使用 Xdoclet 添加 Hbn 标签
4.配置myEclipes -> XDoclet 自动生成 mapping.hbn.xml
5.使用myEclipes 把项目转化成 hibernate 项目
6.使用 org.hibernate.tool.hbm2ddl.SchemaExport 建表

开发过程好处：
1）完全是面向对象，不需要写xml配置文件(XDoclet);
2)项目后期修改容易面对uml
3）用myEclipes 这些都不用去找，直接拿来用(uml,XDoclet,hibernate ..)

下面就来个小例把
1.MyEclipes 使用 uml 参考->MyEclipse 5.5 UML 入门视频 (作者：BeanSoft)

2.由uml生成类文件

3.先使用 eclipes的快键方法写 get/set 方法，类文件文件添加 hbn XDoclet的注解

package bean;

/**
* @hibernate.class table="t1oo"
*/
public class T1oo {

  public int id;
  public String name;
  public int avg;

  /**
   * @hibernate.property
   * column="avg"
   * length="4"
   * not-null="true"
   */
public int getAvg() {
    return avg;
}
public void setAvg(int avg) {
    this.avg = avg;
}
/**
* @hibernate.id
* column="id"
* generator-class="hilo"
*/
public int getId() {
    return id;
}
public void setId(int id) {
    this.id = id;
}
/**
* @hibernate.property
* column="name"
* not-null="true"
* @return
*/
public String getName() {
    return name;
}
public void setName(String name) {
    this.name = name;
}


}

4.用myEclipes 生成 XDoclet
在项目点右键-> properties -> MyEclipse-XDoclet ->
在Configuration 空白初点右键选 add standard -> ... hbn 后面不太好描述可以查下很简单的。配置好了运行后就可以看见多了个 T1oo.hbm.xml 文件;

5.myEclipes + hbn 就不多说了
6. hbn2java:

    public void testCreateTable()throws Exception{
         HibernateSessionFactory.currentSession();
         HibernateSessionFactory.closeSession();

         Field[] ff = HibernateSessionFactory.class.getDeclaredFields();
         Field fie = null ;
         for(int i=0;i<ff.length;i++){
             if( ff[i].getType().equals( Configuration.class ) ){
                 fie = ff[i];
             }
         }
         fie.setAccessible(true);
         Configuration cfg = (Configuration)fie.get(HibernateSessionFactory.class);
         cfg.addInputStream( this.getClass().getResourceAsStream("/bean/T1oo.hbm.xml") );
         //建表
          SchemaExport dbExport = new SchemaExport(cfg);
          dbExport.setOutputFile("c:\\db\\test.txt");
          dbExport.create(true, true);
    }

sql：
drop table if exists t1oo
drop table if exists hibernate_unique_key
create table t1oo (
    id integer not null,
    avg integer not null,
    name varchar(255) not null,
    primary key (id)
)
create table hibernate_unique_key (
     next_hi integer
)
insert into hibernate_unique_key values ( 0 )

效果：
mysql> show tables;
+----------------------+
| Tables_in_hbn        |
+----------------------+
| hibernate_unique_key |
| t1oo                 |
+----------------------+
2 rows in set (0.00 sec)

G_G 2007-12-11 17:51 发表评论

hibernate 查询语句总结

G_G — Mon, 10 Dec 2007 04:52:00 GMT

表关系 T1oo ->ont-to-many-> T2oo (t1oo.id-t2oo.aid)

1.单条select延迟加载

        Iterator it = session.createQuery("from T1oo ").iterate();
        while(it.hasNext()){
            T1oo t1 = (T1oo)it.next();
            t1.getName();
        }
/*运行语句 n+1
这就只加载 id
Hibernate: select t1oo0_.id as col_0_0_ from t1oo t1oo0_
此是在 t1.getName(); 延迟加载的
Hibernate: select t1oo0_.id as id0_, t1oo0_.name as name0_0_ from t1oo t1oo0_ where t1oo0_.id=?
Hibernate: select t1oo0_.id as id0_, t1oo0_.name as name0_0_ from t1oo t1oo0_ where t1oo0_.id=?
*/

2.级连查询：
1)set排序从大到小
2）batch-size="10" 用法是
select * from t2oo where aid in (?,?,?....)
3)

如果想忽略延迟，并有一定逻辑全部加载，这有两中解决办法：
1).内连

mysql> select   *
    -> from t1oo t1oo0_ inner join t2oo t2ooset1_ on t1oo0_.id=t2ooset1_.aid;
+----+-----------+----+-----+------+---------+
| id | name      | id | avg | aid | version |
+----+-----------+----+-----+------+---------+
| 1 | liukaiyi | 1 | 23 |    1 |       1 |
| 1 | liukaiyi | 2 | 24 |    1 |       1 |
| 1 | liukaiyi | 3 | 25 |    1 |       1 |
| 2 | liukaiyi2 | 4 | 26 |    2 |       0 |
+----+-----------+----+-----+------+---------+

Iterator it = new HashSet(session.createQuery("from T1oo t1 inner join fetch t1.t2ooSet t2where t2.id<=3").list()).iterator();
        while(it.hasNext()){
            T1oo t1 = (T1oo)it.next();
            System.out.println(t1.getName());

            for(Iterator itr=t1.getT2ooSet().iterator();itr.hasNext(); ){
                T2oo t2 = (T2oo)itr.next();
                System.out.println("  "+ t2.getAvg() );
            }
        }

结果是：

Hibernate: select t1oo0_.id as id0_, t2ooset1_.id as id1_, t1oo0_.name as name0_0_, t2ooset1_.version as version1_1_, t2ooset1_.avg as avg1_1_, t2ooset1_.aid as aid1_1_, t2ooset1_.aid as aid0__, t2ooset1_.id as id0__ from t1oo t1oo0_ inner join t2oo t2ooset1_ on t1oo0_.id=t2ooset1_.aid where t2ooset1_.id<=3
liukaiyi
  24
  23
  25

G_G 2007-12-10 12:52 发表评论

hibernate cache2

G_G — Fri, 07 Dec 2007 07:36:00 GMT

在hibernate.cfg.xml 中添加缓存 t1oo 一对多 t2oo (t2ooSet)

    <property name="cache.provider_class">org.hibernate.cache.EhCacheProviderproperty>
    <property name="hibernate.cache.use_query_cache">trueproperty>

    <mapping resource="hbn/bean/T1oo.hbm.xml" />
    <mapping resource="hbn/bean/T2oo.hbm.xml" />

    <class-cache class="hbn.bean.T1oo" usage="read-only" />
    <collection-cache collection="hbn.bean.T1oo.t2ooSet" usage="read-only" />
    <class-cache class="hbn.bean.T2oo" usage="read-only" />

在src根目录下 ehcache.xml

xml version="1.0" encoding="UTF-8"?>
<ehcache>
    <diskStore path="java.io.tmpdir"/>
    <defaultCache
        maxElementsInMemory="10000" //最大缓存数目
        eternal="false"＜!-- 缓存是否持久 --＞
        timeToIdleSeconds="120" ＜!-- 当缓存闲置n秒后销毁 --＞
        timeToLiveSeconds="120"＜!-- 当缓存存活n秒后销毁--＞
        overflowToDisk="true"＜!-- 是否保存到磁盘，当系统当机时--＞
        diskPersistent="false"
        diskExpiryThreadIntervalSeconds="120"/>

    <cache
     name="hbn.bean.T1oo"
     maxElementsInMemory="450"
     eternal="false"
     timeToLiveSeconds="600"
     overflowToDisk="true"/>

ehcache>

测试：

    public void testCa()throws Exception{
        System.out.println( getT1ooAll() );

        Thread.sleep(2*1000);

        System.out.println( getT1ooAll() );
    }

控制台输出

Hibernate: select t1oo0_.id as id, t1oo0_.name as name0_ from t1oo t1oo0_ limit ?

Hibernate: select t2ooset0_.aid as aid1_, t2ooset0_.id as id1_, t2ooset0_.id as id0_, t2ooset0_.version as version1_0_, t2ooset0_.avg as avg1_0_, t2ooset0_.aid as aid1_0_ from t2oo t2ooset0_ where t2ooset0_.aid=?
Hibernate: select t2ooset0_.aid as aid1_, t2ooset0_.id as id1_, t2ooset0_.id as id0_, t2ooset0_.version as version1_0_, t2ooset0_.avg as avg1_0_, t2ooset0_.aid as aid1_0_ from t2oo t2ooset0_ where t2ooset0_.aid=?
24 : 23 : 25 : 2

//在这缓存成功没向数据库提交 sql语句
24 : 23 : 25 : 2

G_G 2007-12-07 15:36 发表评论