【Hibernate3.3复习知识点二】 - 配置hibernate环境(annotations)

 

配置文件hibernate.cfg.xml中引入：<mapping class="com.bjsxt.hibernate.Teacher"/>

<hibernate-configuration><session-factory><!-- Database connection settings --><property name="connection.driver_class">com.mysql.jdbc.Driver</property><property name="connection.url">jdbc:mysql://localhost/hibernate</property><property name="connection.username">root</property><property name="connection.password">bjsxt</property><!-- JDBC connection pool (use the built-in) --><property name="connection.pool_size">1</property><!-- SQL dialect --><property name="dialect">org.hibernate.dialect.MySQLDialect</property><!-- Enable Hibernate's automatic session context management --><property name="current_session_context_class">thread</property><!-- Disable the second-level cache  --><property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property><!-- Echo all executed SQL to stdout --><property name="show_sql">true</property><!-- Drop and re-create the database schema on startup --><property name="hbm2ddl.auto">update</property><mapping resource="com/bjsxt/hibernate/Student.hbm.xml"/><mapping class="com.bjsxt.hibernate.Teacher"/></session-factory></hibernate-configuration>

 

实体类：

package com.bjsxt.hibernate;import javax.persistence.Entity;
import javax.persistence.Id;@Entity
public class Teacher {private int id;private String name;private String title;@Idpublic int getId() {return id;}public void setId(int id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getTitle() {return title;}public void setTitle(String title) {this.title = title;}
}

注解所在包：

import javax.persistence.Entity;
import javax.persistence.Id;

类与主键：@Entity  @ Id

 

测试类：

public class TeacherTest {public static void main(String[] args) {Teacher t = new Teacher();t.setId(1);t.setName("t1");t.setTitle("middle");SessionFactory sessionFactory = new AnnotationConfiguration().configure().buildSessionFactory();Session session = sessionFactory.getCurrentSession();session.beginTransaction();session.save(t);session.getTransaction().commit();}
}

注解形式新建sessionFactory 时用new AnnotationConfiguration()。