/**
* Defined by Zend_Validate_Interface
*
* Returns true if and only if $value is unique in DB
*
* @param string $value
* @return boolean
*/
public function isValid($value)
{
$result = !parent::isValid($value);
$this->_errors = array();
$this->_messages = array();
if ($result) {
return true;
}
$this->_error();
return false;
}
public function __construct($table, $column, $pkColumn = null, $pkValue = null, $adapter = null)
{
$this->setPkColumn($pkColumn)->setPkValue($pkValue);
parent::__construct($table, $column, $adapter);
}