On Sep 22, 2007, at 5:17 PM, Frederik wrote:
>
> Hi!
>
> I have an XML file that provides the information needed for table
> creation (column names, types, etc.). Is there any easy way in
> SQLAlchemy to dynamically build Table objects from this information?
> So if I get something like
>
> [{'name': 'firstname', 'type': 'string', 'length': 40}, {'name':
> 'lastname', 'type': 'string', 'length': 40}]
>
> from the XML file, I want something like
>
> mytable = Table('mytable', metadata,
> Column('firstname', types.String(40)),
> Column('lastname', types.String(40))
> )
>
> to be generated.
> (oversimplified, I omitted stuff like primary_key, etc.)
>
> A simple way would be to generate a code string from the information
> and execute it with exec, but I'd like to know if there's a better way
> to do this in SQLAlchemy.
Table is a class constructor, the Column entries are *args sent to
the constructor. just create Column objects on the fly....i.e.
types = {'string':String, 'int':Integer}
res = []
for rec in xmlrecords:
res.append(Column(rec['name'], types[rec['type']], ...))
t = Table(*res)
build on this as necessary to get the type arguments in, primary key
flags, etc.
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