问Spring Boot REST:如何动态访问客户端请求中指定的适当数据库模式？

EN

@Autowired
private CarsRepository carsRepository;

@GetMapping("/cars")
public List<Car> getCars(@RequestParam String env) {
    setSchema(env);
    return carsRepository.findAll();
}

private setSchema(String env) {
    // Do something here to set the schema that the CarsRepository
    // will use when it runs the .findAll() method.
}

@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
    entityManagerFactoryRef = "opsEntityManagerFactory",
    transactionManagerRef = "opsTransactionManager",
    basePackages = { "com.example.repo" }
)
public class OpsDbConfig {

@Autowired
private Environment env;

@Primary
@Bean(name = "opsDataSource")
@ConfigurationProperties(prefix = "db-ops.datasource")
public DataSource dataSource() {
    return DataSourceBuilder
            .create()
            .url(env.getProperty("db-ops.datasource.url"))
            .driverClassName(env.getProperty("db-ops.database.driverClassName"))
            .username(env.getProperty("db-ops.database.username"))
            .password(env.getProperty("db-ops.database.password"))
            .build();
}

@Primary
@Bean(name = "opsEntityManagerFactory")
public LocalContainerEntityManagerFactoryBean opsEntityManagerFactory(
        EntityManagerFactoryBuilder builder,
        @Qualifier("opsDataSource") DataSource dataSource
) {
    return builder
            .dataSource(dataSource)
            .packages("com.example.domain")
            .persistenceUnit("ops")
            .build();
}

@Primary
@Bean(name = "opsTransactionManager")
public PlatformTransactionManager opsTransactionManager(
        @Qualifier("opsEntityManagerFactory") EntityManagerFactory opsEntityManagerFactory
) {
    return new JpaTransactionManager(opsEntityManagerFactory);
}

}