我剛剛開始探索 Spring Data JDBC。我有一個簡單的數據庫（postgres），其中包含我要查詢的問卷表：CREATE TABLE IF NOT EXISTS foster.questionnaires (    questionnaire_id SERIAL PRIMARY KEY,    version varchar(10),    name text,    title text,    description text,    status questionnaire_status_types);和 Java 類：（配置靈感來自這里）@SpringBootApplication(scanBasePackages= {"com.app.foster"})@EnableJdbcRepositories("com.app.foster.dal.repositories")public class FosterApplication extends JdbcConfiguration {    // Config    @Bean    NamedParameterJdbcOperations operations() {        return new NamedParameterJdbcTemplate(dataSource());    }    @Bean    PlatformTransactionManager transactionManager() {        return new DataSourceTransactionManager(dataSource());    }    @Value("${spring.datasource.url}")    private String url;    @Bean    @ConfigurationProperties("spring.datasource")    public HikariDataSource dataSource() {        //User name and password is fetched from some other data storage        HikariConfig hikariConfig = new HikariConfig();        hikariConfig.setJdbcUrl(url);        hikariConfig.setUsername("postgres"); //TODO: abstract these        hikariConfig.setPassword("password");        //The data source created here doesn't have connection timeout value        //set by me        return new HikariDataSource(hikariConfig);    }    @Bean    public ApplicationListener<?> loggingListener() {        return (ApplicationListener<ApplicationEvent>) event -> {            if (event instanceof RelationalEvent) {                System.out.println("Received an event: " + event);            }         };    }    public static void main(String[] args) {        SpringApplication.run(FosterApplication.class, args);    } }（實體）@Entity@Table(name="questionnaires")public class Questionnaire {  @Id  Long questionnaire_id;  String version;  String name;  String title;  String description;    }