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Hi.
It seems there is a bug with SQL CASE support in SQLAlchemy (I'm testing
using trunk).
Here is the original SQL statements:
CREATE TABLE test (
x INTEGER PRIMARY KEY
);
SELECT
CASE WHEN 'true'
THEN (SELECT EXISTS (SELECT x FROM test))
END;
And here is the Python code:
from sqlalchemy import schema, types, sql, create_engine
metadata = schema.MetaData()
test = schema.Table(
'test', metadata,
schema.Column('x', types.Integer, primary_key=True)
)
engine = create_engine('sqlite://')
subquery = sql.exists(test.select().as_scalar())
clause = sql.case([(True, subquery.select().as_scalar)])
query = clause.select()
engine.execute(query)
I get an error:
Traceback (most recent call last):
File "case.py", line 13, in <module>
subquery = sql.exists(test.select().as_scalar())
File
"/usr/local/lib/python2.5/site-packages/sqlalchemy/sql/expression.py",
line 520, in exists
return _Exists(*args, **kwargs)
File
"/usr/local/lib/python2.5/site-packages/sqlalchemy/sql/expression.py",
line 2688, in __init__
s = select(*args, **kwargs).as_scalar().self_group()
File
"/usr/local/lib/python2.5/site-packages/sqlalchemy/sql/expression.py",
line 238, in select
return Select(columns, whereclause=whereclause, from_obj=from_obj,
**kwargs)
File
"/usr/local/lib/python2.5/site-packages/sqlalchemy/sql/expression.py",
line 3492, in __init__
if columns:
File
"/usr/local/lib/python2.5/site-packages/sqlalchemy/sql/expression.py",
line 1289, in __nonzero__
raise TypeError("Boolean value of this clause is not defined")
TypeError: Boolean value of this clause is not defined
I'm not sure if my code is correct.
If it is not correct, what it the correct method to define that query?
Thanks Manlio
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