Symfony 1.4 Doctrine migration base class for checking against existance of the table/field

SafeDoctrineMigrationBase

<?php

abstract class SafeDoctrineMigrationBase extends Doctrine_Migration_Base
{
    public function hasField($table, $field)
    {
        $conn = Doctrine_Manager::connection();
        $result = $conn->execute("SHOW COLUMNS FROM $table LIKE '$field'");
        $fields = $result->fetchAll();
        return !empty($fields);
    }
    
    public function hasTable($table)
    {
        $conn = Doctrine_Manager::connection();
        try
        {
            $conn->execute("DESC $table");
        } 
        catch (Exception $e)
        {
            return false;
        }
        return true;
    }
}