Hibernate-Helloworld

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com</groupId>
    <artifactId>hibernate</artifactId>
    <version>1.0-SNAPSHOT</version>

    <dependencies>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.16</version>
        </dependency>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-core</artifactId>
            <version>5.4.2.Final</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <!--<scope>test</scope>-->
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <!-- 指定jdk -->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
        <resources>
            <!-- 把xml文件也打包到相应位置 -->
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.xml</include>
                </includes>
                <excludes>
                    <exclude>**/*.properties</exclude>
                </excludes>
                <filtering>true</filtering>
            </resource>
            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*.xml</include>
                    <include>**/*.properties</include>
                </includes>
            </resource>
        </resources>
    </build>

</project>

hibernate.cfg.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
    <session-factory>

        <!-- 配置连接数据库的基本信息 -->
        <property name="connection.username">root</property>
        <property name="connection.password">root</property>
        <property name="connection.driver_class">com.mysql.cj.jdbc.Driver</property>
        <property name="connection.url">jdbc:mysql://xxx.xxx.xxx.xxx:3306/hibernate?useSSL=false&amp;characterEncoding=utf-8</property>

        <!-- 配置 hibernate 的基本信息 -->
        <!-- hibernate 所使用的数据库方言 -->
        <property name="dialect">org.hibernate.dialect.MySQL57Dialect</property>

        <!-- 执行操作时是否在控制台打印 SQL -->
        <property name="show_sql">true</property>

        <!-- 是否对 SQL 进行格式化 -->
        <property name="format_sql">true</property>

        <!-- 指定自动生成数据表的策略 -->
        <property name="hbm2ddl.auto">update</property>

        <!-- 指定关联的 .hbm.xml 文件 -->
        <mapping resource="com/hibernate/a/News.hbm.xml"/>

    </session-factory>

</hibernate-configuration>

实体类

News

package com.hibernate.a;

import java.util.Date;

public class News {

    private Integer id;
    private String title;
    private String author;
    private Date date;

    // 用于实例化
    public News() {}

    public News(String title, String author, Date date) {
        super();
        this.title = title;
        this.author = author;
        this.date = date;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getAuthor() {
        return author;
    }

    public void setAuthor(String author) {
        this.author = author;
    }

    public Date getDate() {
        return date;
    }

    public void setDate(Date date) {
        this.date = date;
    }

    @Override
    public String toString() {
        return "News [id=" + id + ", title=" + title + ", author=" + author
                + ", date=" + date + "]";
    }
}

News.hbm.xml

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping package="com.hibernate.a">

    <class name="News" table="NEWS">
        <id name="id" type="java.lang.Integer" column="ID">
            <!-- 指定主键的生成方式, native: 使用数据库本地方式 -->
            <generator class="native" />
        </id>

        <property name="title" type="java.lang.String" column="TITLE" />

        <property name="author" type="java.lang.String" column="AUTHOR"/>

        <property name="date" type="date" column="DATE"/>
    </class>

</hibernate-mapping>

测试

package com.hibernate.a;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.junit.Test;

import java.sql.Date;

public class HibernateTest {

    @Test
    public void test() {
        // 创建 Configuration 对象: 对应 hibernate 的基本配置信息和对象关系映射信息
        Configuration config = new Configuration().configure();

        // 创建 ServiceRegistry 对象: hibernate 的任何配置和服务都需要在该对象中注册后才能有效
//        ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder().applySettings(config .getProperties()).build();

        // 创建 SessionFactory 对象
//        SessionFactory sessionFactory = config.buildSessionFactory(serviceRegistry);
        SessionFactory sessionFactory = config.buildSessionFactory();

        // 创建 Session 对象
        Session session = sessionFactory.openSession();

        // 开启事务
        Transaction transaction = session.beginTransaction();

        // 执行保存操作
        News news = new News("Java12345", "ATGUIGU", new Date(new java.util.Date().getTime()));
        session.save(news);

        News news1 = session.get(News.class, 1);
        System.out.println(news1);

        // 提交事务
        transaction.commit();

        // 关闭 Session
        session.close();

        // 关闭 SessionFactory 对象
        sessionFactory.close();
    }
}

项目结构

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https://blog.csdn.net/qq_34197553/article/details/77718925