Question

我想在我的spring启动项目中手动配置hibernate jpa，因为我需要引用2个数据源。其中一个JPA bean配置如下：

@Configuration
@EntityScan("com.channeljin.common.data.entities.user")
@EnableJpaRepositories(
        entityManagerFactoryRef = "userEntityManagerFactory",
        transactionManagerRef = "userTransactionManager",
        basePackages = "com.channeljin.common.data.repo.user")
public class UserDatasourceConfig {

    @Autowired
    private UserDatasourceProperties properties;

    @Bean
    public DataSource userDatasource() {
        PoolProperties poolProperties = new PoolProperties();
        poolProperties.setDriverClassName("com.mysql.jdbc.Driver");
        poolProperties.setUrl(properties.getUrl());
        poolProperties.setUsername(properties.getUsername());
        poolProperties.setPassword(properties.getPassword());
        org.apache.tomcat.jdbc.pool.DataSource ds = new org.apache.tomcat.jdbc.pool.DataSource();
        ds.setPoolProperties(poolProperties);
        return ds;
    }

    @Bean
    public LocalContainerEntityManagerFactoryBean userEntityManagerFactory() {
        HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
        vendorAdapter.setGenerateDdl(false);
        Map<String, String> properties = new HashMap<>();
//        properties.put("hibernate.implicit_naming_strategy",
//                "org.hibernate.boot.model.naming.ImplicitNamingStrategyLegacyJpaImpl");
//        properties.put("hibernate.physical_naming_strategy",
//                "org.hibernate.boot.model.naming.PhysicalNamingStrategyStandardImpl");
        properties.put("hibernate.show_sql", "true");
        LocalContainerEntityManagerFactoryBean factoryBean =
                new LocalContainerEntityManagerFactoryBean();
        factoryBean.setDataSource(userDatasource());
        factoryBean.setPackagesToScan("com.channeljin.common.data.entities.user");
        factoryBean.setJpaVendorAdapter(vendorAdapter);
        factoryBean.getJpaPropertyMap().putAll(properties);
        return factoryBean;
    }

    @Bean
    public PlatformTransactionManager userTransactionManager() {
        return new JpaTransactionManager(userEntityManagerFactory().getObject());
    }
}

问题在于实体的camelCase字段类似于＆＃39; createTime＆＃39;不能被翻译成像蛇＆＃39; create_time＆＃39;在最终生成的SQL中。我不想使用@Column注释，我更喜欢默认的命名策略方式。那么我应该使用什么命名策略？上面代码中的注释行似乎不起作用。

更新：我用Google搜索，似乎org.hibernate.cfg.ImprovedNamingStrategy会将camelCase更改为snake_case，但它会以Hibernate4为目标，但最新的Spring启动会使用Hibernate5。

Answer 1

经过调试我发现我应该使用Spring的命名策略：org.springframework.boot.orm.jpa.hibernate.SpringPhysicalNamingStrategy。这里的完整bean定义为copy＆amp;贴人。

@Bean
    public LocalContainerEntityManagerFactoryBean userEntityManagerFactory() {
        HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
        vendorAdapter.setGenerateDdl(false);
        Map<String, String> properties = new HashMap<>();
        properties.put("hibernate.implicit_naming_strategy",
                "org.springframework.boot.orm.jpa.hibernate.SpringImplicitNamingStrategy");
        properties.put("hibernate.physical_naming_strategy",
                "org.springframework.boot.orm.jpa.hibernate.SpringPhysicalNamingStrategy");
        properties.put("hibernate.show_sql", "true");
        LocalContainerEntityManagerFactoryBean factoryBean = new LocalContainerEntityManagerFactoryBean();
        factoryBean.setDataSource(userDatasource());
        factoryBean.setPackagesToScan("com.channeljin.common.data.entities.user");
        factoryBean.setJpaVendorAdapter(vendorAdapter);
        factoryBean.getJpaPropertyMap().putAll(properties);
        return factoryBean;
    }

在Spring JPA Hibernate中使用snake case

1 个答案: