Hibernate学习笔记（一）之——根据配置文件自动创建表的两种方式（注解方式和配置文件方式）

￡神魔★判官ぃ 2022-05-17 12:07 146阅读 0赞

环境准备：jdk  eclipse   hibernate、mysql jar包

jar包下载地址：[https://pan.baidu.com/s/1dDRc9rfJDC47lIKqsRdD-A][https_pan.baidu.com_s_1dDRc9rfJDC47lIKqsRdD-A]

![70][]

项目截图：

![70 1][]

--------------------

Student是根据配置文件创建表，Teacher是根据注解创建表

Student.java

package com.java1234.model;
    
    public class Student {
    	private long id;
    	private String name;
    	public long getId() {
    		return id;
    	}
    	public void setId(long id) {
    		this.id = id;
    	}
    	public String getName() {
    		return name;
    	}
    	public void setName(String name) {
    		this.name = name;
    	}
    	
    }

Student.hbm.xml

<?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">
    
    <hibernate-mapping package="com.java1234.model">
    	<class name="Student" table="t_student">
    		
    		<id name="id" column="stuId">
    			<generator class="native"></generator>
    		</id>
    		<property name="name"></property>
    	</class>
    </hibernate-mapping>

Teacher.java

package com.java1234.model;
    
    import javax.persistence.Entity;
    import javax.persistence.GeneratedValue;
    import javax.persistence.Id;
    import javax.persistence.Table;
    
    import org.hibernate.annotations.GenericGenerator;
    
    @Entity
    @Table(name="t_teacher")//映射表名
    public class Teacher {
    	
    	private long id;
    	private String name;
    	
            //主键
    	@Id
    	@GeneratedValue(generator="_native")
    	@GenericGenerator(name="_native",strategy="native")
    	public long getId() {
    		return id;
    	}
    	public void setId(long id) {
    		this.id = id;
    	}
    	public String getName() {
    		return name;
    	}
    	public void setName(String name) {
    		this.name = name;
    	}
    	@Override
    	public String toString() {
    		return "Teacher [id=" + id + ", name=" + name + "]";
    	}
    	
    }

hibernate.cfg.xml      配置文件名称写死

<?xml version='1.0' encoding='utf-8'?>
    <!DOCTYPE hibernate-configuration PUBLIC
            "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
            "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
    
    <hibernate-configuration>
    
        <session-factory>
    
            
            <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
            <property name="connection.url">jdbc:mysql://localhost:3306/hibernate</property>
            <property name="connection.username">root</property>
            <property name="connection.password">root</property>
    
           
            
            <property name="dialect">org.hibernate.dialect.MySQL5Dialect</property>
    	
            
            <property name="show_sql">true</property>
    
            
            <property name="hbm2ddl.auto">update</property>
            
      		<mapping resource="com/java1234/model/Student.hbm.xml"/><!- 根据配置文件自动建表 ->
    		<mapping class="com.java1234.model.Teacher"></mapping><!- 根据注解自动动建表 ->
        </session-factory>
    
    </hibernate-configuration>

HibernateUtil.java

package com.java1234.util;
    
    import org.hibernate.SessionFactory;
    import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
    import org.hibernate.cfg.Configuration;
    import org.hibernate.service.ServiceRegistry;
    
    public class HibernateUtil {
    	private static final SessionFactory sessionFactory = buildSessionFactory();
    	
    	private static SessionFactory buildSessionFactory() {
    		Configuration configuration = new Configuration().configure();//底层默认加载配置src目录下的hibernate.cfg.xml配置文件，所以配置文件名称写死
    		ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder().applySettings(configuration.getProperties()).build();//实例化服务登记
    		SessionFactory sessionFactory = configuration.buildSessionFactory(serviceRegistry);//获取Session工厂
    		return sessionFactory;
    	}
    	
    	public static SessionFactory getSessionFactory() {
    		return sessionFactory;
    	}
    }

测试类：执行测试类就自动创建了

package com.java1234.service;
    
    import org.hibernate.Session;
    import org.hibernate.SessionFactory;
    import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
    import org.hibernate.cfg.Configuration;
    import org.hibernate.service.ServiceRegistry;
    
    import com.java1234.model.Student;
    
    public class StudentTest {
    	private SessionFactory sessionFactory = HibernateUtil.getSessionFactory();
    	public static void main(String[] args) {
    		Session session = sessionFactory.openSession();
    		session.beginTransaction();//开启事务
    		
    		/*Student s = new Student();
    		s.setName("张三");*/
    		
    		
    		session.getTransaction().commit();//提交事务
    		session.close();//关闭session
    		sessionFactory.close();
    	}
    	
    }

[https_pan.baidu.com_s_1dDRc9rfJDC47lIKqsRdD-A]: https://pan.baidu.com/s/1dDRc9rfJDC47lIKqsRdD-A
[70]: /images/20220517/0c222050625b407294343e06cc8476fe.png
[70 1]: /images/20220517/92fdaddd91e848cba4f0dc52d3628044.png