Beginning Oracle Application Express by Rick Greenwald
By Rick Greenwald
Starting Oracle software exhibit КНИГИ ; ОС и БД Название: starting Oracle software convey Автор: Rick Greenwald Издательство: Wiley Publishing, Inc. ISBN: 978-0-470-38837-2 Год: 2008 Формат: PDF Размер: 8.03 MB Страниц: 386 Язык: АнглийскийОписание книги:Oracle software show is an easy-to-use software improvement surroundings outfitted at the Oracle expertise stack. There are elements of that earlier sentence that you could be locate jarring—that Oracle, a firm widely recognized for its database expertise, has an software improvement atmosphere, and that Oracle, an organization regarded as providing high-end, enterprise-ready know-how, has something that's effortless to use.Скачать c .com zero 1 2 three four five
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Each application is identiﬁed by a unique number. The number assigned by default on this page is unique, but it is also somewhat meaningless. You could give your application a more meaningful integer to identify it, but that integer would have to be unique within your Oracle database. For the purposes of this book, you should just accept the assigned number. You can give the application any name you like, but the examples in this book will refer to this application by the name of Book Sample. You can also see that you can create application design templates, which can be used to create default applications that use a structure you have designed.
You will be using some of these options in this and subsequent chapters. Right now, you want to take a quick look at the data in the ORDERS table to make sure that the import from the spreadsheet succeeded as described. 4. Click on the Data option in the top line of choices in the right-hand panel to bring up the page shown in Figure 2-10. This page displays the initial set of data for the table. If there were more rows, you would have the option to scroll through the rows. You can also see that there is a link labeled Download in the lowerleft corner of the data display window.
As you will see in a few steps, the APEX environment is aware of foreign key constraints and implements default options to handle them. indd 37 11/9/08 4:21:38 PM Part II: Building an Application with Application Express Figure 2-24 11. Change the Constraint Type to Foreign Key, which will change the appearance of the page to look like the completed page shown in Figure 2-25. The Constraint Type speciﬁes the action taken on the child data if the parent row is deleted. You can prevent deletes of parents that have children, automatically delete the children of a parent if the parent is deleted, or simply set the value of the foreign key to NULL if the parent is deleted.