On Tuesday, June 7, 2016 at 11:36:43 AM UTC-4, Sammy wrote:
>
> Thanks for your responses. I certainly want to take advantage of
> SQLFORM.grid etc. and I don't mind defining tables. However, I am getting
> errors.
>
> Initially, I was getting the error previously mentioned, i.e. <class
> 'cx_Oracle.DatabaseError'> ORA-00904: "Table1"."ID": invalid identifier.
> Using the link for legacy DB provided by Anthony, I added key field using
> Field('....', 'id'), but now I am getting this error: <type
> 'exceptions.ValueError'> invalid literal for long() with base 10:'..'
>
> What am I doing wrong?
>
In web2py, the "id" field must be an auto-incrementing integer field. If
this is not the case for your table (and you cannot change it), then you
must instead use the "primarykey" argument (see
http://web2py.com/books/default/chapter/29/06/the-database-abstraction-layer#Legacy-databases-and-keyed-tables),
though this entails some limitations.
> I have a few questions that might help me in this-
>
> 1) When they say "legacy DB" do they mean all database created outside of
> web2py?
>
Yes, though a more important distinction is whether the database tables use
an auto-incrementing integer field as the primary key (and whether this is
used for all references). See link above.
> 2) Do I need to define ALL the fields available in the real Table or can I
> get away with defining just the fields that I am interested in?
>
No, just the fields you are using.
> 3) Do I need to specify "type" for each field to match real field
> type? What if there is no one to one mapping available?
>
Ideally. At least provide a type consistent with the data that will be
returned by the database driver (e.g., don't tell web2py to expect floats
from a string field).
Anthony
--
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