如果是两个jpa数据源，怎么配置不上呢？

Question

首先，我的目录结构是这样的：

然后，我的配置是这样的：

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67

@Configuration public class DbConfig {       @Primary     @Bean("db1EntityManager")     public LocalContainerEntityManagerFactoryBean db1EntityManager() {         HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();         vendorAdapter.setGenerateDdl(true);           LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();           Map<String, String> map = new HashMap<>();         map.put("hibernate.dialect", "org.hibernate.dialect.MySQLDialect");           em.setJpaPropertyMap(map);           em.setDataSource(db1DataSource());         em.setPackagesToScan("com.gaojingsi.transaction.muiltidatasourcetransactiondemo.entity.db1");         em.setJpaVendorAdapter(vendorAdapter);           return em;     }       @Primary     @Bean(name = "db1DataSource")     @ConfigurationProperties(prefix = "spring.datasource.db1")     public DataSource db1DataSource() {         return DataSourceBuilder.create().build();     }       @Bean("db2EntityManager")     public LocalContainerEntityManagerFactoryBean db2EntityManager() {         HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();         vendorAdapter.setGenerateDdl(true);           LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();           Map<String, String> map = new HashMap<>();         map.put("hibernate.dialect", "org.hibernate.dialect.MySQLDialect");           em.setJpaPropertyMap(map);           em.setDataSource(db2DataSource());         em.setPackagesToScan("com.gaojingsi.transaction.muiltidatasourcetransactiondemo.entity.db2");         em.setJpaVendorAdapter(vendorAdapter);           return em;     }       @Bean(name = "db2DataSource")     @ConfigurationProperties(prefix = "spring.datasource.db2")     public DataSource db2DataSource() {         return DataSourceBuilder.create().build();     }       @Primary     @Bean     public PlatformTransactionManager transactionManager() {         JpaTransactionManager jpaTransactionManager1 = new JpaTransactionManager();         jpaTransactionManager1.setEntityManagerFactory(db1EntityManager().getObject());         JpaTransactionManager jpaTransactionManager2 = new JpaTransactionManager();         jpaTransactionManager2.setEntityManagerFactory(db2EntityManager().getObject());         ChainedTransactionManager chainedTransactionManager = new ChainedTransactionManager(jpaTransactionManager1, jpaTransactionManager2);         return chainedTransactionManager;     }   }

然后启动就报错：

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

*************************** APPLICATION FAILED TO START ***************************   Description:   Field db1UserDAO in com.gaojingsi.transaction.muiltidatasourcetransactiondemo.service.impl.UserServiceImpl required a bean named 'entityManagerFactory' that could not be found.   The injection point has the following annotations:     - @org.springframework.beans.factory.annotation.Autowired(required=true)     Action:   Consider defining a bean named 'entityManagerFactory' in your configuration.

请问老师，还要做什么配置吗？

Answer 1

大漠风 2020-01-06 02:26:16

使用spring data配置多个数据源，比较好的方式是通过包名将不同的数据库相关的模块分开，然后，你的`DbConfig`也需要分成两个配置类，分别配置两个数据源的jpa配置，通过`@EnableJpaRepositories`的标签来控制不同的包名下的DAO类要使用哪个jpa的配置。

具体的方法，我找了一个链接，你可以参考一下:

https://www.baeldung.com/spring-data-jpa-multiple-databases