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  Oracle Database Tips by Donald Burleson

Examining APEX's Buttons

These buttons are special because they have the Database Action attribute set to a particular setting corresponding to their participation in the Automatic Row Processing process.  It would be advantageous to navigate to the button attributes page as a reference while viewing the following description of the button attributes.

The conditional display on the buttons is based on the P12_ID page item.  The idea is if there is a value in the P12_ID item, then the record exists and can therefore be UPDATEd or DELETEd.  If the P12_ID item is NULL, no record exists and therefore the record needs an INSERT action.

DELETE button

Table 8.1 shows the important attributes of the Delete button.

Database Action

SQL DELETE action

Conditional display

When P12_ID is NOT NULL.

Optional URL Redirect

The Delete button also has the special function of asking the user if they are sure they want to delete the record before actually performing the delete.  This is done by using the Optional URL Redirect attributes of the delete button.

Table 8.1:  Delete button attributes.

SAVE button

Table 8.2 shows the important attributes of the Save button.

Database Action

SQL UPDATE action

Conditional display

When P12_ID is NOT NULL.

Table 8.2:  Save button attributes.

CREATE button

Table 8.3 shows the important attributes for the Create button.

Database Action

SQL INSERT action

Conditional display

When P12_ID is NULL.

Table 8.3:  Create button attributes.


The above book excerpt is from:

Easy HTML-DB Oracle Application Express

Create Dynamic Web Pages with OAE

ISBN 0-9761573-1-4   

Michael Cunningham & Kent Crotty

http://www.rampant-books.com/book_2005_2_html_db.htm

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