spring boot springjpa instance code that supports multiple data sources

1.SpringBoot的程序启动类

import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.EnableAutoConfiguration; import org.springframework.boot.builder.SpringApplicationBuilder; import org.springframework.boot.context.web.SpringBootServletInitializer; import org.springframework.context.annotation.ComponentScan; @ComponentScan @EnableAutoConfiguration //@EnableJpaRepositories(basePackages = "com.sonychina.backend.repository") public class Application extends SpringBootServletInitializer {   public static void main(String[] args) {     SpringApplication app = new SpringApplication(Application.class);     app.run(args);     //SpringApplication.run(Application.class, args);   }   @Override   protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {     return application.sources(Application.class);   } } 

2.双数据源配置类

import java.util.Map; import javax.sql.DataSource; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.autoconfigure.jdbc.DataSourceBuilder; import org.springframework.boot.autoconfigure.orm.jpa.EntityManagerFactoryBuilder; import org.springframework.boot.autoconfigure.orm.jpa.JpaProperties; import org.springframework.boot.context.properties.ConfigurationProperties; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.context.annotation.Primary; import org.springframework.data.jpa.repository.config.EnableJpaRepositories; import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean; import com.test.entity.statistic.SysUser; import com.test.repository.system.SystemRepository; @Configuration @EnableJpaRepositories(entityManagerFactoryRef="entityManagerFactoryPrimary",   basePackageClasses= {SystemRepository.class}) public class GlobalDataConfiguration { // @Autowired // private DBConfig dbConfig;   @Autowired   private JpaProperties jpaProperties;   @Bean(name="primaryDataSource")   @Primary   @ConfigurationProperties(prefix="datasource.primary")   public DataSource primaryDataSource() {     System.out.println("-------------------- primaryDataSource init ---------------------");     return DataSourceBuilder.create().build();   }   @Bean(name="secondaryDataSource")   @ConfigurationProperties(prefix="datasource.secondary")   public DataSource secondaryDataSource() {     System.out.println("-------------------- secondaryDataSource init ---------------------"); //   DataSourceBuilder factory = DataSourceBuilder  //       .create(DBConfig.class.getClassLoader())  //       .driverClassName(dbConfig.getDriver())  //       .url(dbConfig.getUrl())  //       .username(dbConfig.getUser())  //       .password(dbConfig.getPassword());  //   return factory.build();     return DataSourceBuilder.create().build();   } // @Bean(name = "entityManagerPrimary") // @Primary // public EntityManager entityManager(EntityManagerFactoryBuilder builder) { //   return customerEntityManagerFactory(builder).getObject().createEntityManager(); // }   @Bean(name="entityManagerFactoryPrimary")   @Primary   public LocalContainerEntityManagerFactoryBean customerEntityManagerFactory(EntityManagerFactoryBuilder builder) {     return builder.dataSource(primaryDataSource())           .properties(getVendorProperties(primaryDataSource()))           .packages(SysUser.class)           .persistenceUnit("system")           .build();   }   private Map<String, String> getVendorProperties(DataSource dataSource) {     return jpaProperties.getHibernateProperties(dataSource);   } } 

3.第二个jpa实体管理器

import java.util.Map; import javax.sql.DataSource; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.beans.factory.annotation.Qualifier; import org.springframework.boot.autoconfigure.orm.jpa.EntityManagerFactoryBuilder; import org.springframework.boot.autoconfigure.orm.jpa.JpaProperties; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.data.jpa.repository.config.EnableJpaRepositories; import org.springframework.orm.jpa.JpaTransactionManager; import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean; import org.springframework.transaction.PlatformTransactionManager; import org.springframework.transaction.annotation.EnableTransactionManagement; import com.test.entity.manage.Banner; import com.test.repository.manage.BannerRepository; @Configuration @EnableTransactionManagement @EnableJpaRepositories(entityManagerFactoryRef="entityManagerFactorySecondary",   transactionManagerRef="transactionManagerSecondary",   basePackageClasses= {BannerRepository.class}) public class SecondEMFBConfig {   @Autowired   private JpaProperties jpaProperties;   @Autowired@Qualifier("secondaryDataSource")   private DataSource dataSource; // @Bean(name = "entityManagerPrimary") // @Primary // public EntityManager entityManager(EntityManagerFactoryBuilder builder) { //   return customerEntityManagerFactory(builder).getObject().createEntityManager(); // }   @Bean(name="entityManagerFactorySecondary")   public LocalContainerEntityManagerFactoryBean customerEntityManagerFactory(EntityManagerFactoryBuilder builder) {     return builder.dataSource(dataSource)           .properties(getVendorProperties(dataSource))           .packages(Banner.class)           .persistenceUnit("customers")           .build();   }   private Map<String, String> getVendorProperties(DataSource dataSource) {     return jpaProperties.getHibernateProperties(dataSource);   }   @Bean(name = "transactionManagerSecondary")   PlatformTransactionManager transactionManagerSecondary(EntityManagerFactoryBuilder builder) {     return new JpaTransactionManager(customerEntityManagerFactory(builder).getObject());   } } 

4.repository类举例

import org.springframework.data.jpa.repository.JpaRepository; import org.springframework.data.jpa.repository.Modifying; import org.springframework.data.jpa.repository.Query; import com.test.entity.manage.Banner; public interface BannerRepository extends JpaRepository<Banner, Long> {   @Modifying   @Query("update Banner m set m.name=?1 where m.id=?2")   public void update(String bannerName, Long id); } 

1.5.注意：对@Primary修饰的LocalContainerEntityManagerFactoryBean可以不用指定TransactionManager，spring上下文自动使用默认的JpaTransactionManager，但是对于第二个或第三个等等必须指定TransactionManager。可以参考springboot官方文档中的相关章节。

总结

以上所述是小编给大家介绍的spring boot springjpa 支持多个数据源的实例代码，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对武林网网站的支持！