Hibernate 教程（二）[Hibernate对象的，xml配置，注解配置]

准备

数据库建表(Hibernate可以自动生成表，和对应字段，但是不能给字段添加注释，所以选择手动建表)

-- 创建表
CREATE TABLE `Event`(
`id` INT AUTO_INCREMENT COMMENT '唯一标识',
`title` VARCHAR(100) COMMENT '标题',
`date` DATETIME COMMENT '时间',
PRIMARY KEY (id)
)COMMENT '事件';-- 插入数据
INSERT INTO `Event`(title, date) VALUES ('标题一', CURRENT_TIME), ('标题二', CURRENT_TIME), ('标题三', CURRENT_TIME);

XML配置

1.新建orm.entity.Event

package orm.entity;import java.util.Date;public class Event {private Long id;private String title;private Date date;public Long getId() {return id;}public void setId(Long id) {this.id = id;}public String getTitle() {return title;}public void setTitle(String title) {this.title = title;}public Date getDate() {return date;}public void setDate(Date date) {this.date = date;}/*** 重写toString 方便打印对象*/@Overridepublic String toString() {StringBuilder stringBuilder = new StringBuilder();stringBuilder.append("Event {" + "id: "+id+", "+"title: "+title+", "+"date: "+date+ "}");return stringBuilder.toString();}}

新建HibernateStuConfiguration/src/orm/xml/Event.hbm.xml

<?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="orm.entity"><class name="Event" table="Event"><id name="id" column="id"><generator class="increment" /></id><property name="date" type="timestamp" column="date" /><property name="title" /></class></hibernate-mapping>

3.添加的hibernate.cfg.xml配置中

<?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><!-- 1. 配置数据库信息 --><!-- 2. 配置Hibernate信息 --><!-- 3. 把映射文件放到核心位置 --><session-factory><!-- 1 --><property name="hibernate.connection.driver_class">com.mysql.cj.jdbc.Driver</property><property name="hibernate.connection.url"><![CDATA[jdbc:mysql://192.168.1.200:3306/Hibernate?useSSL=false]]></property><property name="hibernate.connection.username">root</property><property name="hibernate.connection.password">123456</property><!-- <property name="hibernate.cache.provider_class">org.hibernate.cache.internal.NoCacheProvider</property> 禁用二级缓存 --><!-- 2 --><property name="hibernate.show_sql">true</property><!-- 显示SQL语句 --><property name="hibernate.format_sql">true</property><!-- 格式化SQL语句 --><property name="hibernate.hbm2ddl.auto">update</property><!-- 自动更新表，没有就创建 --><property name="hibernate.dialect">org.hibernate.dialect.MySQL8Dialect</property><!-- 配置数据库方言 --><!-- 3 --><mapping resource="orm/xml/Event.hbm.xml" /></session-factory>
</hibernate-configuration>

4.测试是否成功
新建测试类 dao.EventDaoTest

package dao;import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.query.Query;
import org.junit.jupiter.api.Test;import orm.entity.Event;public class EventDaoTest {SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();Session session = sessionFactory.openSession();@Testpublic void test01() {// 使用hql进行查询，后面我会讲到String hql = "from Event";Query<Event> query = session.createQuery(hql, Event.class);System.out.println(query.list());}
}

// 控制台打印
Hibernate: selectevent0_.id as id1_0_,event0_.date as date2_0_,event0_.title as title3_0_ fromEvent event0_
[Event {id: 1, title: 标题一, date: 2018-12-23 13:55:49.0}, Event {id: 2, title: 标题二, date: 2018-12-23 13:55:49.0}, Event {id: 3, title: 标题三, date: 2018-12-23 13:55:49.0}]

配置成功

注解配置

1.修改orm.entity.Event

package orm.entity;import java.util.Date;import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;@Entity
@Table(name = "Event")
public class Event {@Id@GeneratedValue(strategy = GenerationType.IDENTITY)private Long id;private String title;@Temporal(TemporalType.TIMESTAMP)private Date date;public Long getId() {return id;}public void setId(Long id) {this.id = id;}public String getTitle() {return title;}public void setTitle(String title) {this.title = title;}public Date getDate() {return date;}public void setDate(Date date) {this.date = date;}/*** 重写toString 方便打印对象*/@Overridepublic String toString() {StringBuilder stringBuilder = new StringBuilder();stringBuilder.append("Event {" + "id: " + id + ", " + "title: " + title + ", " + "date: " + date + "}");return stringBuilder.toString();}}

2.修改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><!-- 1. 配置数据库信息 --><!-- 2. 配置Hibernate信息 --><!-- 3. 把映射文件放到核心位置 --><session-factory><!-- 1 --><property name="hibernate.connection.driver_class">com.mysql.cj.jdbc.Driver</property><property name="hibernate.connection.url"><![CDATA[jdbc:mysql://192.168.1.200:3306/Hibernate?useSSL=false]]></property><property name="hibernate.connection.username">root</property><property name="hibernate.connection.password">123456</property><!-- 2 --><property name="hibernate.show_sql">true</property><!-- 显示SQL语句 --><property name="hibernate.format_sql">true</property><!-- 格式化SQL语句 --><property name="hibernate.hbm2ddl.auto">update</property><!-- 自动更新表，没有就创建 --><property name="hibernate.dialect">org.hibernate.dialect.MySQL8Dialect</property><!-- 配置数据库方言 --><!-- 3 --><mapping class="orm.entity.Event" /></session-factory>
</hibernate-configuration>

3.测试连接
运行EventDaoTest

// 控制台输出
Hibernate: selectevent0_.id as id1_0_,event0_.date as date2_0_,event0_.title as title3_0_ fromEvent event0_
[Event {id: 1, title: 标题一, date: 2018-12-23 13:55:49.0}, Event {id: 2, title: 标题二, date: 2018-12-23 13:55:49.0}, Event {id: 3, title: 标题三, date: 2018-12-23 13:55:49.0}]

项目地址

链接：https://pan.baidu.com/s/196kn4MhSr-qQjWmyNLXOkg
提取码：56om

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Hibernate 教程（二）[Hibernate对象的，xml配置，注解配置]

准备

XML配置

注解配置

项目地址

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