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Posted to user@struts.apache.org by Scott Van Wart <sc...@indosoft.ca> on 2006/02/24 02:29:30 UTC
Validation against database: Form or Action?
I have a number of scenarios where I need to validate against a set of
rows in a database table. For example, when logging in, it's all fine
and dandy to make sure a username and password is entered in the
ActionForm.validate method, but should database access go in the
ActionForm? If so, how do I return errors/messages back to the calling
page from within the Action.execute method?
- Scott
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Re: Validation against database: Form or Action?
Posted by Niall Pemberton <ni...@blueyonder.co.uk>.
Action has some convenience methods for saving errors - you can do something
like the following in your Action's execute method:
if (<insert-condition-here>) {
ActionMessages errors = new ActionMessages();
errors.add("myProperty",
new ActionMessage("myProperty.error"));
saveErrors(request, errors);
return mapping.getInputForward();
}
This will work with the latest version of Struts - it may vary depending on
what verison you're using.
Niall
----- Original Message -----
From: "Scott Van Wart" <sc...@indosoft.ca>
Sent: Friday, February 24, 2006 1:29 AM
> I have a number of scenarios where I need to validate against a set of
> rows in a database table. For example, when logging in, it's all fine
> and dandy to make sure a username and password is entered in the
> ActionForm.validate method, but should database access go in the
> ActionForm? If so, how do I return errors/messages back to the calling
> page from within the Action.execute method?
>
> - Scott
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Re: Validation against database: Form or Action?
Posted by Keith Sader <ks...@gmail.com>.
No, no database access in the action form - yech, bleh, ptui! :-)
General principle: Form > Action > Business Layer > DAO > Database.
Errors and messages from the lower layers can be handled via the
Action.saveMessages() method, then exploited via the
<html:messages><bean:write></html:messages> structures in the .jsp.
hth,
On 2/23/06, Scott Van Wart <sc...@indosoft.ca> wrote:
> I have a number of scenarios where I need to validate against a set of
> rows in a database table. For example, when logging in, it's all fine
> and dandy to make sure a username and password is entered in the
> ActionForm.validate method, but should database access go in the
> ActionForm? If so, how do I return errors/messages back to the calling
> page from within the Action.execute method?
>
> - Scott
--
Keith Sader
ksader@gmail.com
http://www.saderfamily.org/roller/page/ksader
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