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ebook【Delphi跨平台資料庫程式設計火速上手】電子書出版 (CHT)

Delphi 跨平台資料庫程式設計火速上手,是本關於整合 Delphi 的跨平台技術打造 2-Tier 架構的跨平台 APP 的入門技術書。 全書沒有需要理解的技術知識,只講套路。 力求短時間把製作 APP 的工法熟悉,未來要開發其它的應用程式也能舉一反三。 底下...

2010/02/05

Database's foreign key!

The foreign key is very importent in db designing.

Recently test my firebird db system, I used IB Expert create a table and set up some fields, type and primary key.

After I set Constraints->Foreign keys-> Set default rule->On Field, FK Table, FK Field etc.

"Update Rule" and "Delete Rule"is very interesting.

You can set: NO ACTION, CASCADE, SET NULL and SET DEFAULT. It not like MySQL after setup rule but can not used. Is very nice!

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