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Hibernate简介与HelloWorld
一、Hibernate简介:
二、Hibernate4 版Hello World 实现
工程结构:
com.cy.model.Student:
package com.cy.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.cy.model"> <class name="Student" table="t_student"> <!-- <id>代表主键 类的属性名是id,对应表中列名是stuId --> <id name="id" column="stuId"> <!-- 主键生成策略,这里采用mysql的native,自增 --> <generator class="native"></generator> </id> <!-- 普通属性采用property 不写column,那么数据库table的列名也叫name --> <property name="name"></property> </class> </hibernate-mapping>
com.cy.service.StudentTest.java:
package com.cy.service; import org.hibernate.Session; import org.hibernate.SessionFactory; import org.hibernate.boot.registry.StandardServiceRegistry; import org.hibernate.boot.registry.StandardServiceRegistryBuilder; import org.hibernate.cfg.Configuration; import com.cy.model.Student; public class StudentTest { public static void main(String[] args) { Configuration configuration = new Configuration().configure(); //实例化配置文件,默认指定的就是hibernate.cfg.xml StandardServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder().applySettings(configuration.getProperties()).build();//实例化服务登记,服务注册 SessionFactory sessionFactory = configuration.buildSessionFactory(serviceRegistry); //获取session工厂 Session session = sessionFactory.openSession(); //生成一个session session.beginTransaction(); //开启事务 Student s = new Student(); s.setName("张三"); session.save(s); session.getTransaction().commit(); //提交事务 session.close(); //关闭session sessionFactory.close(); //关闭session工厂 } }
hibernate配置文件:hibernate.cfg.xml:
<?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> <!--数据库连接设置 --> <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> <!-- 方言 --> <property name="dialect">org.hibernate.dialect.MySQL5Dialect</property> <!-- 控制台显示SQL --> <property name="show_sql">true</property> <!-- 自动更新表结构 --> <property name="hbm2ddl.auto">update</property> <mapping resource="com/cy/model/Student.hbm.xml"/> </session-factory> </hibernate-configuration>
运行StudentTest.java,测试结果:
Hibernate简介与HelloWorld
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