hibernate所需JAR包(WEB-INF/lib)antlr-2.7.6.jar,cglib-nodep-2.1_3.jar,dom4j-1.6.1.jar,hibernate3.jar,jta.jar,ehcache-1.2.3.jar(有异常才加),junit.jar(单元测试才需要).配置文件(SRC目录下)hibernate.cfg.xml,hibernate映射文件(XXX.hbm.xml)
1.hibernate映射文件映射文件名称同JAVA对象名称,扩展名为.hbm.xml--注意配置文件中的映射关系要成对出现,其DOCTYPE类型如下:<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN""http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">增加<hibernate-mapping>标签,里面再增加<class>标签
2.hibernate配置文件---hibernate.cfg.xml,其DOCTYPE类型如下:<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">增加<hibernate-configuration>标签,里面再增加<session-foactoy>标签
3.hibernate运行(Configuration实例时)需要dom4j-1.6.1.jar支持,configuration.configure()调用此方法时需要读取根目录下的hibernate.cfg.xml(所以此文件要放到src目录下).configuration.buildSessionFactory()调用此方法时需要cglib-nodep-2.1_3.jar支持(此包放到WEB-INF/lib下).
4.出现错误:java.lang.NoClassDefFoundError:net/sf/ehcache/CacheException,ehcache-1.2.3.jar此包没有加载(此包放到WEB-INF/lib下),要使用junit来测试,需要junit.jar包支持(此包放到WEB-INF/lib下).5.出现错误:Not binding factory to JNDI, no JNDI name configured.读取配置文件修改如下:File f=new File("src/hibernate.cfg.xml");configuration.configure(f);--如果是提示信息则表示当前没有JNDI方式,而时JDBC6.出现错误:java.lang.NoClassDefFoundError: javax/transaction/Synchronization.需要jta.jar包(WEB-INF/lib).7.出现错误:NoClassDefFoundError: antlr/ANTLRException.需要antlr-2.7.6.jar包(WEB-INF/lib).
8.Digester使用:
Digester digester=new Digester(); digester.setValidating(false); digester.addObjectCreate("config", "com.blog.config.BlogConfig"); digester.addSetProperties("config"); digester.addObjectCreate("config/dao", "com.blog.config.DaoConfig"); digester.addSetProperties("config/dao"); digester.addSetNext("config/dao", "addDao", "com.blog.config.DaoConfig");InputStream in=classLoader.getResourceAsStream("com/blog/config/BlogConfig.xml");BlogConfig config=(BlogConfig) digester.parse(in);
9.hibernate事务管理:---在WEB.XML配置过滤器通过Filter来实现,doFilter方法如下:SessionFactory sf=HibernateUitl.getSessionFactory();sf.getCurrentSession().beginTransaction();chain.doFilter(request, response);sf.getCurrentSession().getTransaction().rollback();
10.hibernate.cfg.xml内容如下: <session-factory> <!-- 对于sqlite来说,用户名和密码属性可以不设 --> <property name="connection.username"></property> <property name="connection.password"></property> <property name="hibernate.current_session_context_class">thread</property> <property name="hibernate.connection.url">jdbc:sqlite:F:/eclipse_workspace3.5/blog/Test.db</property> <!-- SQLiteDialect自定义类继承Dialect 不需要实现任何方法 --> <property name="hibernate.dialect">com.blog.hibernate.SQLiteDialect</property> <property name="hibernate.connection.driver_class">org.sqlite.JDBC</property> <mapping resource="com/blog/model/User.hbm.xml"/> <mapping resource="com/blog/model/Message.hbm.xml"/> <mapping resource="com/blog/model/ReplyMessage.hbm.xml"/> </session-factory>
11.BlogConfig.xml配置文件内容如下:<?xml version="1.0" encoding="UTF-8"?><config> <dao id="userDao" type="com.blog.dao.impl.UserDao"/> <dao id="messageDao" type="com.blog.dao.impl.MessageDao"/></config>2.BlogConfig类如下:public static Hashtable<String,DaoConfig> beans; public BlogConfig(){beans=new Hashtable<String, DaoConfig>();} public void addDao(DaoConfig bean){beans.put(bean.getId(), bean);} public Object getDao(String name){ DaoConfig config=beans.get(name); if(config==null){throw new BlogException("Could't not Dao:"+name);} return config.getInstance();}3.DaoConfig类如下:private String id; private String type; private Object instance;public Object getInstance() { if(null!=instance){ return instance; } try { Class cls=Class.forName(getType()); instance=cls.newInstance(); return instance; } catch (Exception e) { throw new BlogException("Couldn't not class:"+getType());}}
12. HibernateSessionFactory此类很重要(一般工具会产生),也可以自已写.--主要是通过configuration.configure()读取hibernate.cfg.xml文件得到/重建/关闭ssesionFactry等方法.可以设置得到Interceptor.部分内容如下:private static final String INTERCEPTOR_CLASS="hibernate.uitl.interceptor.class";configuration=new Configuration(); configuration.configure(); String interceptorName=configuration.getProperty(INTERCEPTOR_CLASS);if(interceptorName!=null){Class intercptorClass=HibernateUitl.class.getClassLoader().loadClass(interceptorName); Interceptor interceptor=(Interceptor) intercptorClass.newInstance(); configuration.setInterceptor(interceptor);} if(configuration.getProperty(Environment.SESSION_FACTORY_NAME)!=null){configuration.buildSessionFactory(); }else{ sessionFactory=configuration.buildSessionFactory(); }
public static SessionFactory getSessionFactory() {SessionFactory sf=null; String sfName=configuration.getProperty(Environment.SESSION_FACTORY_NAME); if(sfName!=null){log.debug("Looking up sessionFactory in JINI."); try { sf=(SessionFactory) new InitialContext().lookup(sfName); } catch (NamingException e) {throw new RuntimeException(e); } }else{ sf=sessionFactory; } if(sf==null){throw new IllegalStateException("SessionFactory avaiable");} return sf;}
13.可以自已DaoFactory类,来得到持久化对象(Digester使用),内容如下:public static Object getDao(String name){ if(blogConfig==null){ return null;} if(log.isInfoEnabled()){log.info("Getting the Dao:"+name);} return blogConfig.getDao(name);} public static IUserDao getUserDao(){log.info("Getting the UserDao"); return (IUserDao) blogConfig.getDao("userDao");} public static IMessageDao getMessageDao(){log.info("Getting the MessageDao"); return (IMessageDao) blogConfig.getDao("messageDao");}
