JPA HelloWorld

https://docs.jboss.org/hibernate/orm/current/introduction/html_single/Hibernate_Introduction.html#hello-jpa

POM 依赖：https://mvnrepository.com/artifact/org.hibernate.orm/hibernate-core

<?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>org.example</groupId>
    <artifactId>jpa</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <maven.compiler.source>21</maven.compiler.source>
        <maven.compiler.target>21</maven.compiler.target>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>3.2.1</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <dependencies>
        <dependency>
            <groupId>org.hibernate.orm</groupId>
            <artifactId>hibernate-core</artifactId>
        </dependency>
        <dependency>
            <groupId>com.mysql</groupId>
            <artifactId>mysql-connector-j</artifactId>
        </dependency>
        <!-- <dependency> -->
        <!--     <groupId>com.h2database</groupId> -->
        <!--     <artifactId>h2</artifactId> -->
        <!-- </dependency> -->
        <!-- <dependency> -->
        <!--     <groupId>org.projectlombok</groupId> -->
        <!--     <artifactId>lombok</artifactId> -->
        <!--     <scope>provided</scope> -->
        <!-- </dependency> -->
    </dependencies>

    <repositories>
        <repository>
            <id>public</id>
            <url>https://maven.aliyun.com/repository/public</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
    </repositories>
    <pluginRepositories>
        <pluginRepository>
            <id>public</id>
            <url>https://maven.aliyun.com/repository/public</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </pluginRepository>
    </pluginRepositories>
</project>

Book

@Setter
@Entity
public class Book {
    @Id
    String isbn;
    String title;
}

src/main/resources/META-INF/persistence.xml

<persistence xmlns="https://jakarta.ee/xml/ns/persistence"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="https://jakarta.ee/xml/ns/persistence https://jakarta.ee/xml/ns/persistence/persistence_3_0.xsd"
             version="3.0">
    <persistence-unit name="persistenceUnitName">
        <!-- <class>jpa.entity.Book</class> -->
        <properties><!-- org.hibernate.cfg.JdbcSettings -->
            <property name="jakarta.persistence.jdbc.user" value="sa"/>
            <property name="jakarta.persistence.jdbc.password" value=""/>
            <property name="jakarta.persistence.jdbc.url" value="jdbc:h2:mem:jpa"/>
            <property name="jakarta.persistence.jdbc.driver" value="org.h2.Driver"/>

            <property name="hibernate.show_sql" value="true"/>
            <property name="hibernate.format_sql" value="true"/>
            <property name="hibernate.highlight_sql" value="true"/>
            <property name="hibernate.hbm2ddl.auto" value="update"/>
        </properties>
    </persistence-unit>
</persistence>

Main

// 1. 创建 EntitymanagerFactory
String persistenceUnitName = "persistenceUnitName";
// Map<String, Object> properites = new HashMap<>();
// properites.put(SHOW_SQL, true);
// properites.put(FORMAT_SQL, true);
// properites.put(HIGHLIGHT_SQL, TRUE.toString());
// EntityManagerFactory entityManagerFactory = Persistence.createEntityManagerFactory(persistenceUnitName, properites);
EntityManagerFactory entityManagerFactory = Persistence.createEntityManagerFactory(persistenceUnitName);

// 2. 创建 EntityManager. 类似于 Hibernate 的 SessionFactory
EntityManager entityManager = entityManagerFactory.createEntityManager();

// 3. 开启事务
EntityTransaction transaction = entityManager.getTransaction();
transaction.begin();

// 4. 进行持久化操作
Book book = new Book();
book.setIsbn("1");
book.setTitle("2");
entityManager.persist(book);

// 5. 提交事务
transaction.commit();
// 6. 关闭 EntityManager
entityManager.close();
// 7. 关闭 EntityManagerFactory
entityManagerFactory.close();

结果

[Hibernate] 
    create table Book (
        isbn varchar(255) not null,
        title varchar(255),
        primary key (isbn)
    ) engine=InnoDB
[Hibernate] 
    insert 
    into
        Book
        (title, isbn) 
    values
        (?, ?)

 

---

https://docs.jboss.org/hibernate/orm/current/introduction/html_single/Hibernate_Introduction.html

https://docs.jboss.org/hibernate/orm/current/userguide/html_single/Hibernate_User_Guide.html

https://hibernate.org/orm/documentation

https://jakarta.ee/zh/specifications/persistence/3.1

https://jakarta.ee/learn/docs/jakartaee-tutorial/current/persist/persistence-intro/persistence-intro.html