如何使用Hibernate和gradle初始化数据库？

plugins {
    id 'java'
}

dependencies {
    implementation 'org.hibernate:hibernate-core:5.4.32.Final'
    implementation 'org.hibernate:hibernate-entitymanager:5.4.32.Final'
    implementation 'org.postgresql:postgresql:42.3.1'
}

repositories {
    mavenCentral()
}

import javax.persistence.*;

@Entity
@Table(name = "User")
public class User {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @Column(name = "username")
    private String username;

    @Column(name = "password")
    private String password;

    // Getters and setters
}

<?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>
    <session-factory>
        <property name="hibernate.connection.driver_class">org.postgresql.Driver</property>
        <property name="hibernate.connection.url">jdbc:postgresql://localhost:5432/mydatabase</property>
        <property name="hibernate.connection.username">myusername</property>
        <property name="hibernate.connection.password">mypassword</property>
        <property name="hibernate.dialect">org.hibernate.dialect.PostgreSQLDialect</property>
        <property name="hibernate.hbm2ddl.auto">create</property>
        <mapping class="com.example.User"/>
    </session-factory>
</hibernate-configuration>

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class Main {
    public static void main(String[] args) {
        Configuration configuration = new Configuration().configure();
        SessionFactory sessionFactory = configuration.buildSessionFactory();
        Session session = sessionFactory.openSession();
        session.beginTransaction();

        // 创建并保存实体对象
        User user = new User();
        user.setUsername("admin");
        user.setPassword("password");
        session.save(user);

        session.getTransaction().commit();
        session.close();
        sessionFactory.close();
    }
}