On 12/01/2015 12:49 PM, Jonathan Vanasco wrote:
> I don't think you can get that exact query staying within the ORM's
> cross-platform functionality -- I don't think there is anything that can
> generate the `::` version of casting... but I think something like this
> should produce the same output:
>
> r = session.query( Device.id, Device.name, Device.details )\
> .filter( sqlalchemy.sql.expression.cast(Device.details,
> sqlalchemy.types.String).like('99') )\
> .all()
>
> I'm doing this from memory, so i could be off -- but the general idea is
> that you'll `cast` into a `String`, and then run the `like` operator on
> that column. The API docs will have the correct format.
see also the JSON operators which have some built-in text casting stuff:
http://docs.sqlalchemy.org/en/rel_1_0/dialects/postgresql.html?highlight=json#sqlalchemy.dialects.postgresql.JSON
this is also getting improved in 1.1.
>
>
> That should generate something like :
>
> + SELECT id,name,details FROM Device WHERE cast(details
> as text) LIKE '%99%';
>
> Instead of:
>
> - SELECT id,name,details FROM Device WHERE details::text LIKE '%99%';
>
> If you need to use the `details::text` format, you could use a text
> literal in the WHERE clause.
> see http://docs.sqlalchemy.org/en/latest/orm/tutorial.html#using-textual-sql
>
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