public function getFieldString()
    {
        $fieldString = "`" . $this->m_name . "` " . $this->m_type;
        
        if ($this->m_constraint != null)
        {
            $fieldString .= " (" . $this->m_constraint . ")";
        }
                
        if ($this->isAutoIncrementing())
        {
            $fieldString .= " AUTO_INCREMENT";
        }
        
        if ($this->m_default !== null)
        {
            $fieldString .= " DEFAULT " . $this->m_default;
        }
        
        if (!$this->m_allowNull)
        {
            $fieldString .= " NOT NULL";
        }
        
        return $fieldString;
    }