【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;

    @Id
    public 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()。