Sorry, It was my mistake. We can label that without any issue.
*select([testa.c.id.op("&")(15).label("Id")]) *This one will work perfectly.
On Wed, Feb 26, 2020 at 12:35 PM Balukrishnan <baluc...@gmail.com> wrote:
> Hi, I need one more help.
> By using *select([testa.c.id.op("&")(15)]) *this query i got the result
> object but the return value can only accessed by the key '*anon_1'.*
> I tried to label (and anon_lalel) this query but most of the times query
> fails and the rest the same result(that is label is not getting applied.
> I tried these
>
> - *select([testa.c.id.op.label("Id").("&")(15)]) . => No changes
> still the value can only accesses by the key anon_1*
> -
> *select([testa.c.id.op("&")(15).label("Id")]) . => Error (AttributeError:
> Neither 'BinaryExpression' object nor 'Comparator' object has an attribute
> 'table') *
> - *select([testa.c.id
> <http://testa.c.id>.anon_label("Id").op("&")(15)]) . => Error (TypeError:
> '_anonymous_label' object is not callable) *
> - *select([testa.c.id.op("&")(15).anon_label("Id")]) . **=> Error
> (TypeError: '_anonymous_label' object is not callable)*
>
> How can I label that column with a known name
>
> On Tuesday, February 25, 2020 at 10:32:22 PM UTC+5:30, Balukrishnan wrote:
>>
>> Table definition
>>
>> *from sqlalchemy import *
>> testa = Table(
>> "testa",
>> metadata,
>> Column("id", BigInteger, primary_key=True),
>> Column("str_var_a", String, nullable=True),
>> Colmn("bool_var_a", Boolean, nullable=True),
>> )
>> *
>>
>> and I need to execute a query like.
>>
>> *select([testa.c.id <http://testa.c.id> & 15])*
>>
>> But while executing this query getting an error
>>
>> Traceback (most recent call last):
>> File
>> "/Users/users_name/Projects/x_men/lib/python3.8/site-packages/sqlalchemy/sql/operators.py",
>> line 81, in __and__
>> return self.operate(and_, other)
>> File
>> "/Users/users_name/Projects/x_men/lib/python3.8/site-packages/sqlalchemy/sql/elements.py",
>> line 731, in operate
>> return op(self.comparator, *other, **kwargs)
>> File
>> "/Users/users_name/Projects/x_men/lib/python3.8/site-packages/sqlalchemy/sql/operators.py",
>> line 81, in __and__
>> return self.operate(and_, other)
>> File "<string>", line 1, in <lambda>
>> File
>> "/Users/users_name/Projects/x_men/lib/python3.8/site-packages/sqlalchemy/sql/type_api.py",
>> line 67, in operate
>> return o[0](self.expr, op, *(other + o[1:]), **kwargs)
>> File
>> "/Users/users_name/Projects/x_men/lib/python3.8/site-packages/sqlalchemy/sql/default_comparator.py",
>> line 147, in _conjunction_operate
>> return and_(expr, other)
>> File
>> "/Users/users_name/Projects/x_men/lib/python3.8/site-packages/sqlalchemy/sql/elements.py",
>> line 2098, in and_
>> return cls._construct(operators.and_, True_, False_, *clauses)
>> File
>> "/Users/users_name/Projects/x_men/lib/python3.8/site-packages/sqlalchemy/sql/elements.py",
>> line 2028, in _construct
>> clauses = [
>> File
>> "/Users/users_name/Projects/x_men/lib/python3.8/site-packages/sqlalchemy/sql/elements.py",
>> line 2029, in <listcomp>
>> _expression_literal_as_text(clause)
>> File
>> "/Users/users_name/Projects/x_men/lib/python3.8/site-packages/sqlalchemy/sql/elements.py",
>> line 4569, in _expression_literal_as_text
>> return _literal_as_text(element)
>> File
>> "/Users/users_name/Projects/x_men/lib/python3.8/site-packages/sqlalchemy/sql/elements.py",
>> line 4592, in _literal_as_text
>> return _literal_as(element, _no_text_coercion)
>> File
>> "/Users/users_name/Projects/x_men/lib/python3.8/site-packages/sqlalchemy/sql/elements.py",
>> line 4582, in _literal_as
>> raise exc.ArgumentError(
>> sqlalchemy.exc.ArgumentError: SQL expression object expected, got object of
>> type <class 'int'> instead
>>
>>
>> But in Postgres using psql command I can perform the query *SELECT id &
>> 15 FROM testa;*. Is there any *support* for this in *sqlalchemy*.
>>
> --
> SQLAlchemy -
> The Python SQL Toolkit and Object Relational Mapper
>
> http://www.sqlalchemy.org/
>
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--
SQLAlchemy -
The Python SQL Toolkit and Object Relational Mapper
http://www.sqlalchemy.org/
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