【发布时间】：2023-04-06 08:36:01
【问题描述】：
我在使用 Hibernate 和 Spring Boot 时遇到了问题。 Hibernate 加载了两次，因此它创建了数据库，然后再次重新创建它（使用 hbm2ddl.auto=create，所以我预计一次）。
@Configuration
@EnableAutoConfiguration
@ComponentScan(basePackageClasses = {
UserMapper.class,
EventMapper.class,
GroupMapper.class,
UserServiceImpl.class,
EventServiceImpl.class,
GroupServiceImpl.class,
UserController.class
})
@PropertySource(value = {"classpath:application.properties"})
@Import({ DatabaseConfig.class })
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
和数据库配置：
@EnableJpaRepositories(basePackageClasses = {
EventRepository.class,
GroupRepository.class,
UserRepository.class
})
@EnableTransactionManagement
public class DatabaseConfig {
private static final String DB_DRIVER_CLASS = "db.driver";
private static final String DB_PASSWORD = "db.password";
private static final String DB_URL = "db.url";
private static final String DB_USERNAME = "db.username";
private static final String DB_SSL = "db.ssl";
private static final String DB_SSL_FACTORY = "db.ssl.factory";
private static final String DB_FORMAT_SQL = "db.formatSql";
private static final String DB_DIALECT = "db.dialect";
private static final String DB_SHOW_SQL = "db.show_sql";
private static final String DB_HBM2DLL_AUTO = "db.hbm2ddl.auto";
private static final String DB_POOL_SIZE = "db.poolSize";
@Resource
private Environment env;
@Bean
public SessionFactory sessionFactory() throws IOException {
final LocalSessionFactoryBean factory = new LocalSessionFactoryBean();
factory.setDataSource(dataSource());
factory.setPackagesToScan(packagesToScan());
factory.setHibernateProperties(dataSourceProperties());
factory.setAnnotatedClasses(classesToAdd());
factory.afterPropertiesSet();
return factory.getObject();
}
private DataSource dataSource() {
DriverManagerDataSource dataSource = new DriverManagerDataSource();
dataSource.setDriverClassName(env.getRequiredProperty(DB_DRIVER_CLASS));
dataSource.setUrl(env.getRequiredProperty(DB_URL));
dataSource.setUsername(env.getRequiredProperty(DB_USERNAME));
dataSource.setPassword(env.getRequiredProperty(DB_PASSWORD));
dataSource.setConnectionProperties(connectionPropertiesDev());
return dataSource;
}
public Class[] classesToAdd() {
return new Class[]{
};
}
public String[] packagesToScan() {
return new String[] {""};
}
private Properties dataSourceProperties() {
Properties props = new Properties();
props.put("hibernate.connection.driver_class", env.getRequiredProperty(DB_DRIVER_CLASS));
props.put("hibernate.connection.url", env.getRequiredProperty(DB_URL));
props.put("hibernate.connection.username", env.getRequiredProperty(DB_USERNAME));
props.put("hibernate.connection.password", env.getRequiredProperty(DB_PASSWORD));
props.put("hibernate.connection.pool_size", env.getRequiredProperty(DB_POOL_SIZE));
props.put("hibernate.connection.requireSSL", env.getRequiredProperty(DB_SSL));
props.put("hibernate.hbm2ddl.auto", env.getRequiredProperty(DB_HBM2DLL_AUTO));
props.put("hibernate.show_sql", env.getRequiredProperty(DB_SHOW_SQL));
props.put("hibernate.dialect", env.getRequiredProperty(DB_DIALECT));
props.put("hibernate.format_sql", env.getRequiredProperty(DB_FORMAT_SQL));
return props;
}
private Properties connectionPropertiesDev() {
Properties properties = new Properties();
properties.put("ssl", env.getRequiredProperty(DB_SSL, Boolean.class));
properties.put("sslfactory", env.getRequiredProperty(DB_SSL_FACTORY));
return new Properties();
}
@Bean
public LocalContainerEntityManagerFactoryBean entityManagerFactory() {
LocalContainerEntityManagerFactoryBean entityManagerFactoryBean = new LocalContainerEntityManagerFactoryBean();
entityManagerFactoryBean.setDataSource(dataSource());
entityManagerFactoryBean.setPersistenceProviderClass(HibernatePersistenceProvider.class);
entityManagerFactoryBean.setPackagesToScan(packagesToScan());
entityManagerFactoryBean.setJpaProperties(dataSourceProperties());
return entityManagerFactoryBean;
}
@Bean
public HibernateTransactionManager transactionManager() throws IOException {
final HibernateTransactionManager txManager = new HibernateTransactionManager(sessionFactory());
txManager.afterPropertiesSet();
return txManager;
}
}
有人知道为什么会这样吗？
【问题讨论】：
-
可能是因为您有一个
LocalContainerEntityManagerFactoryBean和一个SessionFactory？你两个都需要吗？您是否需要其中任何一个（因为 Boot 会为您创建一个）？
标签： java spring hibernate spring-boot spring-data-jpa