Question

我正在执行从源数据库读取行的任务，如果目标数据库中存在相同的记录，则合并目标数据库中的行。我检查了两个entityManager对象的数据源，它们看起来很好。

我正在为各个源和目标数据库创建一个名为primary和secondary的bean ::

@Bean(name = "primary")
@Primary
public LocalContainerEntityManagerFactoryBean entityManager() {

    LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();
    em.setPersistenceUnitName("primary");
    em.setPersistenceXmlLocation("classpath:./META-INF/persistence.xml");
    // PropertyPlaceholderConfigurer
    // configurer=appConfig.getPropertyPlaceholderConfigurer();

    em.setDataSource(dataSource());

    HashMap<String, Object> properties = new HashMap<String, Object>();
    properties.put("hibernate.hbm2ddl.auto", hibernateHbm2ddlAuto);
    properties.put("hibernate.dialect", hibernateDialect);
    properties.put("hibernate.show_sql", true);
    em.setJpaPropertyMap(properties);

    em.setPackagesToScan(new String[] { "org.x.y" });

    HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
    em.setJpaVendorAdapter(vendorAdapter);

    return em;
}

和

@Bean(name = "secondary")
public LocalContainerEntityManagerFactoryBean targetEntityManager() {
    LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();
    em.setPersistenceUnitName("secondary");
    em.setPersistenceXmlLocation("classpath:./META-INF/persistence.xml");
    em.setDataSource(targetDataSource());
    // PropertyPlaceholderConfigurer
    // configurer=appConfig.getPropertyPlaceholderConfigurer();

    em.setPackagesToScan(new String[] { "org.x.y" });

    HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
    em.setJpaVendorAdapter(vendorAdapter);
    HashMap<String, Object> properties = new HashMap<String, Object>();
    properties.put("hibernate.hbm2ddl.auto", hibernateHbm2ddlAuto);
    properties.put("hibernate.dialect", hibernateDialect);
    properties.put("hibernate.show_sql", true);
    em.setJpaPropertyMap(properties);

    return em;
}

由于JPA需要在 persistance.xml 中定义一个数据源，因此我指定了相同的数据源。但仍无法合并目标数据库中的记录。如果我错过了什么，请建议

JPA EntityManager不合并目标数据库中的实体

0 个答案: