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脚本之家网站的支持！
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