跟我学

项目结构

--src/main/java
----com.easy.a_basic
------TestApp.java
------User.java
------hibernate.cfg.xml
------User.hbm.xml
----build.gradle

build.gradle

compile group: 'org.hibernate', name: 'hibernate-core', version: '5.1.0.Final'
compile group: 'mysql', name: 'mysql-connector-java', version: '5.1.38'
compile group: 'junit', name: 'junit', version: '4.12'

User.java

public class User {private Integer id;private String username;private Integer age;

User.hbm.xml

<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN""http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping><class name="com.easy.a_basic.User" table="t_user"><id name="id" column="ID"><generator class="native"></generator></id><property name="username" column="UserName"></property><property name="age" column="Age"></property></class>
</hibernate-mapping>

hibernate.cfg.xml

<!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="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property><property name="hibernate.connection.url">jdbc:mysql://localhost:3306/test</property><property name="hibernate.connection.username">root</property><property name="hibernate.connection.password">123456</property><property name="show_sql">true</property><property name="format_sql">true</property><property name="hbm2ddl.auto">update</property><mapping resource="com/easy/a_basic/User.hbm.xml"/></session-factory>
</hibernate-configuration>

TestApp.java

public class TestApp {public static void main(String[] args) {//1.加载配置文件URL url=TestApp.class.getResource("/com/easy/a_basic/hibernate.cfg.xml");Configuration conf=new Configuration().configure(url);//2.创建工厂SessionFactory sessionFactory = conf.buildSessionFactory();//3.通过session建立与数据库的关系Session session = sessionFactory.openSession();//4.开启事务Transaction trans=session.beginTransaction();//5.业务逻辑User user=new User();user.setUsername("Kimsime");user.setAge(18);session.save(user);//6.提交事务trans.commit();//7.关闭资源session.close();sessionFactory.close();}
}