今天临下班时遇到了一个需求，我的管理平台需要从不同的数据库中获取数据信息，这就需要进行Spring的多数据源配置，对于这种配置，第一次永远都是痛苦的，不过经历了这次的折磨，今后肯定会对这种配置印象深刻。我们这里简单回顾一下流程。

我们配置了两个数据库，一个是公司的数据库，另一个是我本地的一个数据库。首先是application.yml的配置(其中对于公司的数据库我们采取了假的地址，而本机的数据库是真是存在对应的表和库的)

数据库信息：

数据表信息：

1、application.yml

datasource: primary: url: jdbc:mysql://companyurl.com:5002/db1 username: unameq password: passwd1 driver-class-name: com.mysql.jdbc.Driver secondary: url: jdbc:mysql://localhost:3306/django_test username: root password: 123456 driver-class-name: com.mysql.jdbc.Driver jpa: database-platform: org.hibernate.dialect.MySQL5Dialect hibernate: ddl-auto: update show-sql: true

2、创建总的DataSource配置文件以及两个Repostory的配置文件PrimaryConfig以及SecondaryConfig

DataSourceConfig

@Configurationpublic class DataSourceConfig { @Bean(name = "primaryDataSource") @Qualifier("primaryDataSource") @ConfigurationProperties(prefix="spring.datasource.primary")//对应的数据库配置信息 public DataSource primaryDataSource() { return DataSourceBuilder.create().build(); } @Bean(name = "secondaryDataSource") @Qualifier("secondaryDataSource") @Primary @ConfigurationProperties(prefix="spring.datasource.secondary") public DataSource secondaryDataSource() { return DataSourceBuilder.create().build(); }}

PrimaryConfig

@Configuration@EnableTransactionManagement@EnableJpaRepositories( entityManagerFactoryRef="entityManagerFactoryPrimary", transactionManagerRef="transactionManagerPrimary", basePackages= { "数据访问层所在的包" }) //设置Repository所在位置public class PrimaryConfig { @Autowired @Qualifier("primaryDataSource") private DataSource primaryDataSource; @Primary @Bean(name = "entityManagerPrimary") public EntityManager entityManager(EntityManagerFactoryBuilder builder) { return entityManagerFactoryPrimary(builder).getObject().createEntityManager(); } @Primary @Bean(name = "entityManagerFactoryPrimary") public LocalContainerEntityManagerFactoryBean entityManagerFactoryPrimary (EntityManagerFactoryBuilder builder) { return builder .dataSource(primaryDataSource) .properties(getVendorProperties(primaryDataSource)) .packages("实体类所在的包") //设置实体类所在位置 .persistenceUnit("primaryPersistenceUnit") .build(); } @Autowired private JpaProperties jpaProperties; private Map<String, String> getVendorProperties(DataSource dataSource) { return jpaProperties.getHibernateProperties(dataSource); } @Primary @Bean(name = "transactionManagerPrimary") public PlatformTransactionManager transactionManagerPrimary(EntityManagerFactoryBuilder builder) { return new JpaTransactionManager(entityManagerFactoryPrimary(builder).getObject()); }}

SecondaryConfig

@Configuration@EnableTransactionManagement@EnableJpaRepositories( entityManagerFactoryRef="entityManagerFactorySecondary", transactionManagerRef="transactionManagerSecondary", basePackages= { "数据访问层所在的包" }) //设置Repository所在位置public class SecondaryConfig { @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("实体类所在的包") //设置实体类所在位置 .persistenceUnit("secondaryPersistenceUnit") .build(); } @Autowired private JpaProperties jpaProperties; private Map<String, String> getVendorProperties(DataSource dataSource) { return jpaProperties.getHibernateProperties(dataSource); } @Bean(name = "transactionManagerSecondary") PlatformTransactionManager transactionManagerSecondary(EntityManagerFactoryBuilder builder) { return new JpaTransactionManager(entityManagerFactorySecondary(builder).getObject()); }}

3、然后我对于本地数据库新建实体类PeoplePerson

@Entity@Table(name = "people_person")public class PeoplePerson implements Serializable { @Id @GeneratedValue private Integer id; @Column(name = "name") private String name; @Column(name = "age") private Integer age; public PeoplePerson() { } public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public Integer getAge() { return age; } public void setAge(Integer age) { this.age = age; } @Override public String toString() { return "PeoplePerson{" + "id=" + id + ", name='" + name + '\'' + ", age=" + age + '}'; }}

并创建对应的Repositoy，PeoplePersonDao并创建了一个findAll的方法

@Transactional@Repositorypublic interface PeoplePersonDao extends JpaRepository<PeoplePerson, Long> { List<PeoplePerson> findAll(); }

4、最后，在test包中进行测试

@Autowiredprivate PeoplePersonDao peoplePersonDao;@Testpublic void testMultiDataSource() { List<PeoplePerson> list = peoplePersonDao.findAll(); for (int i = 0; i < list.size(); i++) { logger.info(list.get(i).toString()); }}

测试结果

一些坑

不仅仅是dao层扫描的包需要区分，对于实体类所在的包，不同的DataSource的配置中也需要区分开

对于这种套路性的东西，总结一遍是非常必要的，下次可以节省许多不必要的时间，对于内部原理，我将在完成对Ioc和Aop分析后反过来分析其原理。

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。