在使用spring-data-jpa时，如果要配置多数据源，一般为以下三个步骤：

• 在配置文件配置多数据源
• 不同源的 repository 放入不同包路径
• 声明不同的包路径下使用不同的数据源、事务支持

1.配置文件配置多数据源

spring.primary.datasource.url=jdbc:mysql://localhost:3306/testspring.primary.datasource.username=rootspring.primary.datasource.password=rootspring.primary.datasource.driver-class-name=com.mysql.jdbc.Driverspring.secondary.datasource.url=jdbc:mysql://localhost:3306/test1spring.secondary.datasource.username=rootspring.secondary.datasource.password=rootspring.secondary.datasource.driver-class-name=com.mysql.jdbc.Driver

2.不同源的 repository 放入不同包路径

3.声明不同的包路径下使用不同的数据源

将数据源注入到 Factory，配置 repository、domian 的位置，需要设置一个默认的数据源

@Configuration@EnableTransactionManagement@EnableJpaRepositories(        entityManagerFactoryRef = "entityManagerFactoryPrimary",        transactionManagerRef = "transactionManagerPrimary",        basePackages = {"com.zb.boot.repository.primary"}//声明路径)public class PrimaryConfig {    @Autowired    private JpaProperties jpaProperties;    @Autowired    @Qualifier("primaryDataSource")    private DataSource primaryDataSource;    public EntityManager entityManager(EntityManagerFactoryBuilder builder){        return entityManagerFactoryPrimary(builder).getObject().createEntityManager();    }    @Bean(name = "entityManagerFactoryPrimary")    @Primary    public LocalContainerEntityManagerFactoryBean entityManagerFactoryPrimary(EntityManagerFactoryBuilder builder){        return builder.dataSource(primaryDataSource)                .properties(getVendorProperties(primaryDataSource))                .packages("com.zb.boot.model")//实体类的路径                .persistenceUnit("primaryPersistenceUnit")                .build();    }    public Map
    
      getVendorProperties(DataSource dataSource){        return jpaProperties.getHibernateProperties(dataSource);    }    @Bean(name = "transactionManagerPrimary")    @Primary    PlatformTransactionManager transactionManagerPrimary(EntityManagerFactoryBuilder builder){        return new JpaTransactionManager(entityManagerFactoryPrimary(builder).getObject());    }}
    

@Configuration@EnableTransactionManagement@EnableJpaRepositories(        entityManagerFactoryRef="entityManagerFactorySecondary",        transactionManagerRef="transactionManagerSecondary",        basePackages= { "com.zb.boot.repository.secondary" })public class SecondaryConfig {    @Autowired    private JpaProperties jpaProperties;    @Autowired    @Qualifier("secondaryDataSource")    private DataSource secondaryDataSource;    @Bean(name = "entityManagerSecondary")    public EntityManager entityManager(EntityManagerFactoryBuilder builder) {        return entityManagerFactorySecondary(builder).getObject().createEntityManager();    }    @Bean(name = "entityManagerFactorySecondary")    public LocalContainerEntityManagerFactoryBean entityManagerFactorySecondary (EntityManagerFactoryBuilder builder) {        return builder                .dataSource(secondaryDataSource)                .properties(getVendorProperties(secondaryDataSource))                .packages("com.zb.boot.model")                .persistenceUnit("secondaryPersistenceUnit")                .build();    }    private Map
    
      getVendorProperties(DataSource dataSource) {        return jpaProperties.getHibernateProperties(dataSource);    }    @Bean(name = "transactionManagerSecondary")    PlatformTransactionManager transactionManagerSecondary(EntityManagerFactoryBuilder builder) {        return new JpaTransactionManager(entityManagerFactorySecondary(builder).getObject());    }}
    

读取两个配置源，构建两个数据源：

@Configurationpublic class DataSourceConfig {    @Bean(name = "primaryDataSource")    @Qualifier("primaryDataSource")    @ConfigurationProperties(prefix = "spring.primary.datasource")    public DataSource primaryDataSource(){        return DataSourceBuilder.create().build();    }    @Bean(name = "secondaryDataSource")    @Qualifier("secondaryDataSource")    @Primary    @ConfigurationProperties(prefix = "spring.secondary.datasource")    public DataSource secondaryDataSource(){        return DataSourceBuilder.create().build();    }}