问题
Many vendors such as Microsoft with Sharepoint and Dynamics have made it impossible to access database tables directly in newer versions as they convert to Software as Service (SAS) offerings.
I am working with PTC Windchill and have developed extensive Oracle SQL Layer ETL processing. Is this a future proof practice within the context of this product line? Or in the future will I be required to work through some sort of DAL. If so, is there a recommended practice?
The information available from Windchill for Cloud appear vague and mostly suggesting to me virtualizion at the infrastructure layer, suggesting I would be able to query at the database layer for many years to come. Any confirmation, pointers or feedback would be appreciated.
来源：https://stackoverflow.com/questions/54712891/querying-database-of-windchill-using-sql