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These types of validations use the PL/SQL language to determine the outcome of the validation.  Take note that while using the validation creation wizard to create this type of validation, text will appear below the main region on the Validation Method page as shown in Figure 12.2.  Clicking on the links of the text in bold reveals the syntax examples.  These are valuable and should be used when necessary.  The following is a brief summary of help not found in the HTML DB documentation.

§         PL/SQL Expression:  Same at the SQL Expression above.

§         PL/SQL Error:  Used to raise an application error.

§         Function Returning Boolean: A PL/SQL function returning the TRUE or FALSE validation status.

§         Function Returning Error Text:  This is useful if error messages are stored in a database table because the text could be queried and returned from the function.  If this method is used, a value for the Error Message is not needed even though it still shows as a mandatory field.

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  

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