在没有XML的情况下配置JPA/Hibernate/PostgreSQL

Question

我正在回到Java世界,我正在尝试使用JPA,Hibernate和PostgreSQL配置一个新的Spring Web应用程序.

我发现了许多带有各种XML配置文件的旧示例,我想知道是否有一种首选的新方法来执行此配置而不依赖于XML文件创作.

我需要配置的一些东西是hibernate sql方言,驱动程序等.

Answer 1

将以下片段放入用@Configurationand 注释的类中@EnableTransactionManagement

Hibernate/JPA(编辑packagesToScan String):

@Bean
public LocalContainerEntityManagerFactoryBean entityManagerFactory() {
    LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();
    em.setDataSource(dataSource());
    em.setPackagesToScan(new String[] { "com.XY.model" });
    JpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
    em.setJpaVendorAdapter(vendorAdapter);
    em.setJpaProperties(additionalProperties());
    return em;
}

Properties additionalProperties() {
    Properties properties = new Properties();
    properties.setProperty("hibernate.hbm2ddl.auto", "update");
    properties.setProperty("hibernate.dialect", "org.hibernate.dialect.PostgreSQL9Dialect");
    properties.setProperty("hibernate.show_sql", "true");
    return properties;
}

DataSource(编辑用户名,密码和主机地址):

@Bean
public DataSource dataSource() {
    DriverManagerDataSource dataSource = new DriverManagerDataSource();
    dataSource.setDriverClassName("org.postgresql.Driver");
    dataSource.setUrl("jdbc:postgresql://localhost:port/DB_NAME");
    dataSource.setUsername("root");
    dataSource.setPassword("");
    return dataSource;
}

交易经理:

@Bean
public PlatformTransactionManager transactionManager(EntityManagerFactory emf) {
    JpaTransactionManager transactionManager = new JpaTransactionManager();
    transactionManager.setEntityManagerFactory(emf);
    return transactionManager;
}