Username Validation

[Vishwanath]

Hi guys,

I'm new to Spring and Hibernate, looking for some help on Validation...

In my application, I have a registration form with two fields 'username' and 'password' and a corresponding controller that is used to save it to the database.

My validator checks if the field entries are not empty..etc
Fine till now.

I want my validator to check if the username entered already exists in the database and if so show a corresponding msg in the formView...

But the problem is I dont see how I can access my db from the validator...
?? (help me here plz..)
----

I access the db from my controller in this way:

WebApplicationContext context;
 ...
context=WebApplicationContextUtils.getRequiredWebApplicationContext(req.getSession().getServletContext());

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Thanks,
Vishwa

[sixseasons]

Not sure if it's possible. However, It's better to validate user info in controller/DAO using database stored procedure. With this approach, one database call will check if the user exists, if it does, return 'user already exists' error otherwise save new user details.

[Vishwanath]

Thanks... I'll try that...

[TerpInMD]

why wouldnt you be able to access the dB from a validator? just register the validator like a controller or service object then inject or better yet autowire a service method that checks the db for dups.

[Vishwanath]

Hi..

Please correct me if I'm making a fundamental mistake... (I guess im making one...??? )

I understand that through DI, I can inject values...

But in the code there must be a context.getBean(theBeanNameWhereDependencyInjectio nIsConfigured)

Somewhere or the other in my code I would need a getBean() method invocation...

(Please tell me if im right till here...)

Looking at the API I find that it can be done using,

WebApplicationContext context;
 ...
context=WebApplicationContextUtils.getRequiredWebApplicationContext(theServletContext);

AccountSave accountSave=(AccountSave)context.getBean("AccountSaveDao");

But don see how I can get theServletContext in my validator..

In one other code I used

WebApplicationContext context;
 ...
context=WebApplicationContextUtils.getRequiredWebApplicationContext(req.getSession().getServletContext());

thus getting theServletContext thro' req object...
But here the validate method has no request object to use...