Hibernate第一个例子

大配置文件

<?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>
 ???????<!-- 指定数据库所用到的驱动 -->
 ???????<property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
 ???????<!-- 指定数据库链接的url，hibernate链接的数据库名 -->
 ???????<property name="connection.url">jdbc:oracle:thin:@localhost:1521:orcl</property>
 ???????<!-- 指定连接数据库的用户名 -->
 ???????<property name="connection.username">root</property>
 ???????<!-- 指定连接数据库的用户口令 -->
 ???????<property name="connection.password">root</property>
 ???????<!--格式化sql -->
 ???????<property name="format_sql ">true</property>
 ???????<!-- 指定数据库方言 -->
 ???????<property name="dialect">org.hibernate.dialect.Oracle10gDialect</property>
 ???????<!-- 根据需要自动创建数据库表 -->
 ???????<property name="hbm2ddl.auto">update</property>
 ???????<!-- 打印sql 控制台-->
 ???????<property name="show_sql">true</property>
 ???????<!--关联小配置文件-->
 ???????<mapping resource="cn/sjl/entity/School.hbm.xml"></mapping>
 ???</session-factory>
</hibernate-configuration>

实体类

public class School {
 ???private int schoolid;
 ???private String schoolname;

 ???public int getSchoolid() {
 ???????return schoolid;
 ???}
 ???public void setSchoolid(int schoolid) {this.schoolid = schoolid;}
 ???
 ???public String getSchoolname() {
 ???????return schoolname;
 ???}
 ???public void setSchoolname(String schoolname) {
 ???????this.schoolname = schoolname;
 ???}
}


小配置文件

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
 ???????"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
 ???????"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<!-- 映射文件开始 -->
<hibernate-mapping package="cn.sjl.entity">
 ???<class name="School" table="School">
 ??????<id name="schoolid" column="schoolid">
 ??????????<generator class="native"></generator>
 ??????</id>
 ???????<property name="schoolname" column="schoolname"></property>
 ???</class>
</hibernate-mapping>


测试类

//get方法
@Test
public ?void ?test02(){
 ???//构造Configuration对象，读取大配置文件
 ???Configuration cfg=new Configuration().configure();
 ???//构造工厂
 ???SessionFactory factory=cfg.buildSessionFactory();
 ???//Session对象 ??openSession()
 ???Session session = factory.openSession();
 ???School school1 = session.get(School.class, 2);
 ???System.out.println("学校名称："+school1.getSchoolname());
 ???System.out.println(school1);
 ???//关闭session
 ???session.close();
}