Spring hibernate 不创建 mysql 表

Question

我正在实现一个具有两个数据库连接的后端。一个到 MS Access 数据库，另一个到 MySQL 数据库。我已经设置了两个配置类并且 应用程序运行ning 没有任何错误 消息，但是 没有创建 tables 代表我在 mysql db.

中的实体

项目结构：

my.backend
  |
  --> configuration
  --> controller
  --> exceptions
  --> model
  | |
  | --> mysql
  | --> msaccess
  |
  --> repo
  | |
  | --> mysql
  | --> msaccess
  |
  --> service

我的配置文件如下所示： MySQL配置：

imports [...]

@Configuration
@EnableJpaRepositories(
        entityManagerFactoryRef = "mysqlEntityManagerFactory",
        transactionManagerRef = "mysqlTransactionManager",
        basePackages = "my.backend.repo.mysql"
)
public class MySqlJpaConfig {
    @Autowired
    private Environment env;

    @Bean
    @Primary
    @ConfigurationProperties(prefix = "mysql")
    public LocalContainerEntityManagerFactoryBean mysqlEntityManagerFactory() {
        LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();
        em.setDataSource(mysqlDataSource());
        em.setPackagesToScan("my.backend.model.mysql");
        em.setPersistenceUnitName("mysql");
        em.setJpaVendorAdapter(new HibernateJpaVendorAdapter());

        HashMap<String, Object> jpaProperties = new HashMap<>();
        jpaProperties.put("hibernate.ddl-auto",
                env.getProperty("mysql.jpa.hibernate.ddl-auto"));
        jpaProperties.put("hibernate.dialect",
                env.getProperty("mysql.jpa.properties.hibernate.dialect"));
        em.setJpaPropertyMap(jpaProperties);

        return em;
    }

    @Primary
    @Bean
    public DataSource mysqlDataSource() {

        DriverManagerDataSource dataSource
                = new DriverManagerDataSource();
        dataSource.setUrl(env.getProperty("mysql.url"));
        dataSource.setUsername(env.getProperty("mysql.username"));
        dataSource.setPassword(env.getProperty("mysql.password"));
        dataSource.setDriverClassName(Objects.requireNonNull(env.getProperty("mysql.driver-class-name")));

        return dataSource;
    }

    @Primary
    @Bean
    public PlatformTransactionManager mysqlTransactionManager() {

        JpaTransactionManager transactionManager
                = new JpaTransactionManager();
        transactionManager.setEntityManagerFactory(
                mysqlEntityManagerFactory().getObject());
        return transactionManager;
    }
}

MS 访问配置：

@Configuration
@EnableJpaRepositories(
        entityManagerFactoryRef = "msaccessEntityManagerFactory",
        transactionManagerRef = "msaccessTransactionManager",
        basePackages = "my.backend.repo.msaccess"
)
@EnableTransactionManagement
public class MsAccessJpaConfig {
    @Autowired
    private Environment env;

    @Bean
    @ConfigurationProperties(prefix = "mysql")
    public LocalContainerEntityManagerFactoryBean msaccessEntityManagerFactory() {
        LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();
        em.setDataSource(msaccessDataSource());
        em.setPackagesToScan("my.backend.model.msaccess");
        em.setPersistenceUnitName("msaccess");
        //em.setPersistenceProvider(new HibernatePersistenceProvider());
        em.setJpaVendorAdapter(new HibernateJpaVendorAdapter());

        HashMap<String, Object> jpaProperties = new HashMap<>();
        jpaProperties.put("hibernate.dialect",
                env.getProperty("msaccess.jpa.properties.hibernate.dialect"));
        em.setJpaPropertyMap(jpaProperties);
        return em;
    }

    @Bean
    public DataSource msaccessDataSource() {

        DriverManagerDataSource dataSource
                = new DriverManagerDataSource();
        dataSource.setUrl(env.getProperty("msaccess.url"));
        dataSource.setDriverClassName(Objects.requireNonNull(env.getProperty("msaccess.driver-class-name")));

        return dataSource;
    }

    @Bean
    public PlatformTransactionManager msaccessTransactionManager() {

        JpaTransactionManager transactionManager
                = new JpaTransactionManager();
        transactionManager.setEntityManagerFactory(
                msaccessEntityManagerFactory().getObject());
        return transactionManager;
    }

}

还有我的 application.properties 文件：

spring.jpa.show-sql=true
spring.jpa.open-in-view=false
# MySQL config
mysql.url=jdbc:mysql://localhost:3306/my_database
mysql.username=
mysql.password=
mysql.driver-class-name=com.mysql.cj.jdbc.Driver
mysql.jpa.hibernate.ddl-auto=update
mysql.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL8Dialect
# MS Access config
msaccess.url=jdbc:ucanaccess://c:/users/username/documents/test.accdb
msaccess.driver-class-name=net.ucanaccess.jdbc.UcanaccessDriver
msaccess.jpa.properties.hibernate.dialect=org.hibernate.dialect.SQLServerDialect

当我运行我的应用程序没有自定义配置并且只有一个原始数据库连接（只有 MySQL）时一切正常。此外，如果我运行执行此操作并执行获取请求，我会收到一个错误，指出 table 不存在（显然），因此存在与 MySQL 的连接，但应用程序不会创建我需要的 tables。顺便说一句，MS Access 的工作方式相同，但我不希望那里有 table 代。

我是否遗漏了一些连接配置？

感谢您的帮助！干杯，尼克拉斯

Answer 1

我的猜测是您必须在 jpa 属性配置中使用 hibernate.hbm2ddl.auto 而不是 hibernate.ddl-auto，因为这是 hibernate 查找的名称

Spring hibernate 不创建 mysql 表

Spring hibernate does not create mysql tables

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