Spring Boot - 无法确定数据库类型为NONE的嵌入式数据库驱动程序类

Question

我相信我有正确的组合datanucleus-appengine和datanucleus罐子：2.1：需要DataNucleus 3.1.x（core，api-jdo，api-jpa，enhancer）。需要SDK 1.6.4+请注意，DataNucleus项目不再支持此版本的DatanucleusJPA App配置：@Configuration@EnableJpaRepositories("demo.core.entity")@EnableTransactionManagementclass JpaApplicationConfig {    private static final Logger logger = Logger            .getLogger(JpaApplicationConfig.class.getName());    @Bean    public AbstractEntityManagerFactoryBean entityManagerFactory() {        logger.info("Loading Entity Manager...");        LocalContainerEntityManagerFactoryBean factory = new LocalContainerEntityManagerFactoryBean();        factory.setPersistenceUnitName("transactions-optional");        return factory;    }    @Bean    public PlatformTransactionManager transactionManager() {        logger.info("Loading Transaction Manager...");        JpaTransactionManager txManager = new JpaTransactionManager();        txManager.setEntityManagerFactory(entityManagerFactory().getObject());        return txManager;    }    @Bean    public PersistenceExceptionTranslator persistenceExceptionTranslator() {        return new OpenJpaDialect();    }}Application.java@Configuration@ComponentScan@EnableAutoConfiguration@RestControllerpublic class Application {    private static final EntityManagerFactory INSTANCE =            Persistence.createEntityManagerFactory("transactions-optional");    public static void main(String[] args) {        SpringApplication.run(Application.class, args);    }    @RequestMapping("/")    public String home() {        return "Hello World";    }}

Answer 1

如果您想使用Spring Boot的嵌入式H2数据库，请将以下依赖项添加到您的pom文件中。

    <dependency>

        <groupId>com.h2database</groupId>

        <artifactId>h2</artifactId>

        <version>1.3.156</version>

    </dependency>

但正如评论中所提到的，嵌入式H2数据库将数据保存在内存中，并且不会永久存储它。