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transaction in multitier application

Discuss transaction in multitier application in the Delphi Programming forum on Dev Shed.
transaction in multitier application Delphi Programming forum discussing Delphi related topics including Kylix, C++ Builder, and more. Delphi is a high-performance language, originally based on the PASCAL language.

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  #1  
Old November 23rd, 2005, 09:30 AM
gutopmc gutopmc is offline
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Question transaction in multitier application
I have to alter one value on a table for each item of a sale, and if the user closes the client application with reset, alt+f4 or any othe way, how do I make a rollback.
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Old November 26th, 2005, 03:47 AM
M.Hirsch M.Hirsch is offline
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Quote:
Originally Posted by gutopmc
I have to alter one value on a table for each item of a sale, and if the user closes the client application with reset, alt+f4 or any othe way, how do I make a rollback.

If you're inside a transaction, and did not set any auto-commit, it will be rolled back automatically when you close the connection to the database (i.e. close the program).

M.
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Old December 16th, 2005, 02:20 PM
gutopmc gutopmc is offline
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Quote:
Originally Posted by M.Hirsch
If you're inside a transaction, and did not set any auto-commit, it will be rolled back automatically when you close the connection to the database (i.e. close the program).

M.


ok this is true for a client/server, but what will hapend in a 3-tier if just the client and not the application server is closed?
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Old December 16th, 2005, 02:36 PM
M.Hirsch M.Hirsch is offline
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Quote:
Originally Posted by gutopmc
ok this is true for a client/server, but what will hapend in a 3-tier if just the client and not the application server is closed?

You could trap the window close events, but this won't help always, eg. if an uncaught exception closes the client program.

Maybe use "keepalives", send a ping message every n seconds or something like that.

M.
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