spring boot动态变更数据库

Question

如何在运行Spring Boot应用程序时更改数据库？当RestController收到带有连接参数的请求时，我需要连接另一个数据库。这是我的RestController的一部分。

@RequestMapping(value = "/change",method = RequestMethod.GET)
public ResponseEntity<?> change(@RequestParam String ip, @RequestParam String port,
                                @RequestParam String dbname, @RequestParam String username,
                                @RequestParam String password ){
    //change datasource here
    return new ResponseEntity<>(HttpStatus.OK);
}

把事情弄清楚。我是Spring和Spring Boot的新手。因此，我希望看到一个没有老式的Spring xmls的解决方案。这是我当前的数据库配置。

@Configuration
@EnableJpaRepositories("su.asgor.dao")
@EnableTransactionManagement
@ComponentScan("su.asgor")
public class DatabaseConfig {

    @Bean
    public DataSource dataSource() {
        BasicDataSource ds = new BasicDataSource();
        ds.setUrl("jdbc:postgresql://localhost:5432/portal74");
        ds.setDriverClassName("org.postgresql.Driver");
        ds.setUsername("postgres");
        ds.setPassword("system");

        ds.setInitialSize(30);
        ds.setMinIdle(30);
        ds.setMaxIdle(60);
        ds.setTimeBetweenEvictionRunsMillis(30000);
        ds.setMinEvictableIdleTimeMillis(60000);
        ds.setTestOnBorrow(true);
        ds.setValidationQuery("select version()");
        return ds;
    }

    @Bean
    public LocalContainerEntityManagerFactoryBean entityManagerFactory() {
        LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();
        em.setDataSource(dataSource());
        em.setPackagesToScan("su.asgor.model");
        em.setJpaVendorAdapter(new HibernateJpaVendorAdapter());

        Properties hibernateProperties = new Properties();
        hibernateProperties.put("hibernate.dialect","org.hibernate.dialect.PostgreSQL9Dialect");
        hibernateProperties.put("hibernate.show_sql","false");
        hibernateProperties.put("hibernate.hbm2ddl.auto","update");

        em.setJpaProperties(hibernateProperties);
        return em;
    }

    @Bean
    public PlatformTransactionManager transactionManager() {
        JpaTransactionManager manager = new JpaTransactionManager();
        manager.setEntityManagerFactory(entityManagerFactory().getObject());
        return manager;
    }
}

Answer 1

您可以使用在运行时根据某些条件选择特定datasource的AbstractRoutingDataSource。

请看下面的示例：

https://spring.io/blog/2007/01/23/dynamic-datasource-routing/