Hibernate之AbstractEntityPersister

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Hibernate开发中需要根据持久层对象获取所映射的数据库表相关信息，如表名，主键，外键对象等相关系。

Hibernate配置 Hibernate.cfg.xml

<?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><!-- Database connection settings --><property name="connection.driver_class">com.mysql.jdbc.Driver</property><property name="connection.url">jdbc:mysql://localhost:3306/ehome</property><property name="connection.username">root</property><property name="connection.password">mysql</property><property name="dialect">org.hibernate.dialect.MySQLDialect</property><property name="current_session_context_class">thread</property><property name="show_sql">true</property><mapping resource="org/bkgd/ehome/jeeplugin/userapp/domain/HhArticle.hbm.xml" /></session-factory></hibernate-configuration>

HhArticle.hbm.xml 文件在此省略

编写HibernateUtil辅助类获取sessionFactory

public class HibernateUtils {private static final SessionFactory sessionFactory;;//创建sessionFactorystatic {        try {            sessionFactory = new Configuration().configure().buildSessionFactory();        } catch (Throwable ex) {            System.err.println("Initial SessionFactory creation failed." + ex);            throw new ExceptionInInitializerError(ex);        }    }    public static SessionFactory getSessionFactory() {        return sessionFactory;    }}

测试类

public class TestPersister {private static AbstractEntityPersister classMetadata;private Object obj;public TestPersister(SessionFactory sessionFatory, Object obj) {classMetadata = (AbstractEntityPersister) sessionFatory.getClassMetadata(obj.getClass());this.obj = obj;}/** * @param args */public static void main(String[] args) {//实例化classMetadata   传入sessionFactory和obj对象TestPersister tp = new TestPersister(HibernateUtils.getSessionFactory(),new HhArticle());Session session = HibernateUtils.getSessionFactory().getCurrentSession();session.beginTransaction();SQLQuery sqlquery = session.createSQLQuery("DELETE FROM " + classMetadata.getTableName());sqlquery.executeUpdate();session.getTransaction().commit(); //事务提交//classMetadata一些其他操作System.out.println(classMetadata.getTableName());  //表名System.out.println(classMetadata.getIdentifierPropertyName()); //主键列映射属性System.out.println(classMetadata.getEntityName()); //对象名称for(String str:classMetadata.getPropertyNames()){   //非主键属性 System.out.println(str);   }}public AbstractEntityPersister getClassMetadata() {return classMetadata;}public void setClassMetadata(AbstractEntityPersister classMetadata) {this.classMetadata = classMetadata;}public Object getObj() {return obj;}public void setObj(Object obj) {this.obj = obj;}}