Hibernate学习笔记（三）--基于xml配置文件的单表增删改查
一、目录结构
二、代码实现
2.1测试类FirstDemo.java(com.myfirst)
import org.hibernate.Hibernate;
import org.hibernate.Session;
import org.hibernate.Transaction;
import com.myfirst.domain.Student;
import com.myfirst.util.HibernateUtil;
public class FirstDemo {
public static void main(String[] args) {
Session session = HibernateUtil.getSessionFactory().openSession();
Transaction tx = session.beginTransaction();
//Student students = new Student();
Student s = new Student();
s.setName("黄子涛");
//students.setName("黄子涛");
//students.setId(2);
//session.update(students);
session.delete(s);
tx.commit();
Student stu = (Student)session.get(Student.class,1);
System.out.println(stu.getName()+stu.getId());
session.close();
}
}
2.2 实体类（com.myfirst.domain）
2.2.1实体类Student
public class Student {
private Integer id;
private String name;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
2.2.2Student.hbm.xml文件
<?xml version="1.0" encoding="UTF-8"?>
<!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.myfirst.domain">
<class name="Student" table="TB_STUDENT" >
<id name="id" type="java.lang.Integer">
<column name="id"/>
<generator class="identity"/>
</id>
<property name="name" column="NAME"></property>
</class>
</hibernate-mapping>2.3工具类HibernateUtil
import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistry;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
public class HibernateUtil {
private static SessionFactory sf;
static {
Configuration config = new Configuration().configure();
StandardServiceRegistry ssr = new StandardServiceRegistryBuilder().applySettings(config.getProperties()).build();
sf= config.buildSessionFactory(ssr);
}
public static SessionFactory getSessionFactory() {
return sf;
}
}
2.4数据库文件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>
<!-- 配置数据库各个参数 -->
<session-factory>
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="connection.url">jdbc:mysql://localhost:3306/db_student?characterEncoding=utf-8</property>
<property name="connection.username">root</property>
<property name="connection.password"></property>
<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
<!-- 显示sql语句 -->
<property name="show_sql">true</property>
<!-- 格式化代码 -->
<property name="format_sql">true</property>
<property name="hbm2ddl.auto">update</property>
<mapping resource="com\myfirst\domain\Student.hbm.xml" />
</session-factory>
</hibernate-configuration>