Question

Hi friends i have added this in my form

    $email->addValidator(new Zend_Validate_Db_NoRecordExists(array(
                    //add database, table and field
                    'adapter'=>Zend_Registry::get('zf_sandbox'),
                    'field'=>'email',
                    'table'=>'users'
                    ), TRUE )
        );

when i reload the form page in browser i get the error

Message: No entry is registered for key ‘zf_sandbox’

How do i register this please help

Answer 1

'adapter'=>Zend_Registry::get('zf_sandbox')

This does not appear to be a database adapter. it seems to be a database name.
If you are using only one database and your database adapter is setup in your application.ini or bootstrap.php then your adapter is likely set.
At worst you have to do:
'adapter'=>Zend_Db_Table::getDefaultAdapter(),
Your application.ini will likely have your Db adapter already setup and will resemble this:

resources.db.adapter = "pdo_Mysql"
resources.db.params.username = "username"
resources.db.params.password = "password"
resources.db.params.dbname = "dbname"
resources.db.isDefaultTableAdapter = true