@MapperScan("com..xxx.mapper")
@PropertySource("classpath:xxx-dal.properties")
@Import(DalConfiguratrion.class)
public class DalConfiguration {

    @Bean
    public DatabaseIdProvider getDatabaseIdProvider(){
        DatabaseIdProvider databaseIdProvider = new VendorDatabaseIdProvider();
        Properties properties = new Properties();
        // Properties 中 "Oracle" 为 DatabaseProductName 每种数据库的JDBC都有自己Name, 如果下面列的没有自己的数据库类型， 可以Debug模式下调试VendorDatabaseIdProvider.getDatabaseName()
        properties.setProperty("Oracle","oracle");
        properties.setProperty("MySQL","mysql");
        databaseIdProvider.setProperties(properties);
        return databaseIdProvider;
    }
}