We have a webapp that makes use of sqlite3 create_function type
queries. Using 0.6, this has worked well for us.
Using 0.7 our approach breaks. I've tried to distill a minimal test
case to demonstrate the issue:
#!/usr/bin/python
from sqlalchemy import create_engine, __version__
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import create_session
def foo(s):
return s
print __version__
engine = create_engine('sqlite:///foo.db', echo=False)
base = declarative_base(bind=engine)
dataset = type('dataset', (base,),
dict(__tablename__='records',__table_args__={'autoload': True}))
dbtype = engine.name
session = create_session(engine)
connection = engine.raw_connection()
connection.create_function('foo', 1, foo)
query =
session.query(dataset).filter('foo("TESTVALUE")="TESTVALUE"').all()
Using 0.6, this works. Using 0.7, we get an OperationalError: no such
function as per below:
0.7.6
Traceback (most recent call last):
File "./test.py", line 20, in <module>
query =
session.query(dataset).filter('foo("TESTVALUE")="TESTVALUE"').all()
File "/home/tkralidi/lib/python2.6/site-packages/SQLAlchemy-0.7.6-
py2.6-linux-i686.egg/sqlalchemy/orm/query.py", line 2066, in all
return list(self)
File "/home/tkralidi/lib/python2.6/site-packages/SQLAlchemy-0.7.6-
py2.6-linux-i686.egg/sqlalchemy/orm/query.py", line 2176, in __iter__
return self._execute_and_instances(context)
File "/home/tkralidi/lib/python2.6/site-packages/SQLAlchemy-0.7.6-
py2.6-linux-i686.egg/sqlalchemy/orm/query.py", line 2191, in
_execute_and_instances
result = conn.execute(querycontext.statement, self._params)
File "/home/tkralidi/lib/python2.6/site-packages/SQLAlchemy-0.7.6-
py2.6-linux-i686.egg/sqlalchemy/engine/base.py", line 1450, in execute
params)
File "/home/tkralidi/lib/python2.6/site-packages/SQLAlchemy-0.7.6-
py2.6-linux-i686.egg/sqlalchemy/engine/base.py", line 1583, in
_execute_clauseelement
compiled_sql, distilled_params
File "/home/tkralidi/lib/python2.6/site-packages/SQLAlchemy-0.7.6-
py2.6-linux-i686.egg/sqlalchemy/engine/base.py", line 1697, in
_execute_context
context)
File "/home/tkralidi/lib/python2.6/site-packages/SQLAlchemy-0.7.6-
py2.6-linux-i686.egg/sqlalchemy/engine/base.py", line 1690, in
_execute_context
context)
File "/home/tkralidi/lib/python2.6/site-packages/SQLAlchemy-0.7.6-
py2.6-linux-i686.egg/sqlalchemy/engine/default.py", line 335, in
do_execute
cursor.execute(statement, parameters)
sqlalchemy.exc.OperationalError: (OperationalError) no such function:
foo u'SELECT records.id AS records_id, records.title AS records_title
\nFROM records \nWHERE foo("TESTVALUE")="TESTVALUE"' ()
For reference, the table structure is as follows:
$ sqlite3 foo.db
SQLite version 3.7.3
Enter ".help" for instructions
Enter SQL statements terminated with a ";"
sqlite> .dump
PRAGMA foreign_keys=OFF;
BEGIN TRANSACTION;
CREATE TABLE records(id int primary key, title text);
INSERT INTO "records" VALUES(1,'foo');
INSERT INTO "records" VALUES(2,'bar');
COMMIT;
sqlite>
Any idea on how to support this approach in both 0.6 and 0.7? Thanks
for any advice.
..Tom
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