MySQL Query

Hi, Is there a way of updating a table so that I can add some sort of identifier to each field, something as simple as x=1 will do. I want to be able to modify the table so I can set a variable for each column so I can tell whether I can let a user modify that field. If I modify the fieldname then the web application wont work. The purpose of this is to create a content management system that will allow me to set which fields are editable by the user. I don't want to add another field to each table because I want the system to be as portable and pluggable into other web sites as possible. Any ideas would be greatly appreciated. Thanks