问题
I work with SQL Server database with ODBC, C++. I want to detect modifications in some tables of the database: another application inserts or updates rows and I have to detect all these modifications. It does not have to be the immediate trigger, it is acceptable to use polling to periodically check database tables for modifications.
Below is the way I think this can be done, and need your opinions whether this is the standard/right way of doing this, or any better approaches exist.
What I've thought of is this: I add triggers in SQL Server, which, on any modification, will insert the identifiers of modified/added rows into special table, which I will check periodically from my application. Suppose there are 3 tables: Customers, Products, Services. i will make three additional tables: Change_Customers, Change_Products, Change_Services, and will insert the identifiers of modified rows of the respective tables. Then I will read these Change_* tables from my application periodically and delete processed records.
Now if you agree that above solution is right, I have another question: Is it better to have separate Change_* tables for each of my tables I wish to monitor, or is it better to have one fat Changes table which will contain the changes from all tables.
回答1:
Query Notifications is the technology designed to do exactly what you're describing. You can leverage Query Notifications from managed clients via the well known SqlDependency class, but there are native Ole DB and ODBC ways too. See Working with Query Notifications, the paragraphs about SSPROP_QP_NOTIFICATION_MSGTEXT (OleDB) and SQL_SOPT_SS_QUERYNOTIFICATION_MSGTEXT (ODBC). See The Mysterious Notification for an explanation how Query Notifications work.
This is the only polling-free solution that work with any kind of updates. Triggers and polling for changes has severe scalability and performance issues. Change Data Capture and Change Tracking are really covering a different topic (synchronizing datasets for occasionally connected devices, eg. Sync Framework).
回答2:
Change Data Capture(CDC)--http://msdn.microsoft.com/en-us/library/cc645937.aspx
First you will need to enable CDC in database :: USE db_name GO EXEC sys.sp_cdc_enable_db GO
Enable CDC on table then :: sys.sp_cdc_enable_table
Then you can query changes
回答3:
- If your version of Sql Server is 2005 - you may use Notification Services
- If your Sql Server is 2008+ - there is most preferrable way to use triggers and log changes to log tables and periodically poll these tables from application to see the changes
来源：https://stackoverflow.com/questions/9092398/how-to-monitor-database-updates-from-application