I'd suggest at least reading the DAL chapter of the book. My advice is that 
if your project needs to query hundreds of legacy tables, DAL won't help 
you. On the other end, if you have 20-30 tables is pretty easy to "learn" 
the syntax and define tables with migrate=False that will avoid creating 
those tables (because they exist already in your backend) and use those 
definitions in DAL.
http://web2py.com/books/default/chapter/29/06/the-database-abstraction-layer

On Tuesday, December 24, 2013 2:07:44 PM UTC+1, Giuseppe D'Amico wrote:
>
> Hi I am  a newbie to web2py, I would like to know if there is a way to 
> build the model of a database at run-time, for my application I have to 
> connect to a legacy database and making queries on it, thus I thought   
> that I need to build   the model at run-time, I cane connect to the db with 
> dal and query it about its table, can create the tables, but I do not know 
> how to add the field to them, somewhere  on internet I found append_field, 
> but when used my script return this error: KeyError: 'append_field'
>

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