If I do this:
from sqlalchemy import *
from StringIO import StringIO
buf = StringIO()
pg_engine = create_engine('sqlite://', strategy='mock',
executor=lambda s,p=';': buf.write(s.__str__() + p))
buf.truncate(0)
tables = [x[1] for x in sorted(db.metadata.tables.items(), key=lambda
x: x[0])]
for table in tables:
table.create(pg_engine)
print buf.getvalue()
ok, it prints,
but if I change engine to 'postgres://'
then sqlalchemy print error:
---------------------------------------------------------------------------
AttributeError Traceback (most recent call
last)
59 tables = [x[1] for x in sorted(db.metadata.tables.items(),
key=lambda x: x[0])]
60 for table in tables:
---> 61 table.create(pg_engine)
62 print buf.getvalue()
63
/usr/lib/python2.7/site-packages/sqlalchemy/schema.pyc in create(self,
bind, checkfirst)
525 bind._run_visitor(ddl.SchemaGenerator,
526 self,
--> 527 checkfirst=checkfirst)
528
529
/usr/lib/python2.7/site-packages/sqlalchemy/engine/strategies.pyc in
_run_visitor(self, visitorcallable, element, connection, **kwargs)
247 kwargs['checkfirst'] = False
248 visitorcallable(self.dialect, self,
--> 249 **kwargs).traverse(element)
250
251 def execute(self, object, *multiparams, **params):
/usr/lib/python2.7/site-packages/sqlalchemy/sql/visitors.pyc in
traverse(self, obj)
94 """traverse and visit the given expression
structure."""
95
---> 96 return traverse(obj, self.__traverse_options__,
self._visitor_dict)
97
98 @util.memoized_property
/usr/lib/python2.7/site-packages/sqlalchemy/sql/visitors.pyc in
traverse(obj, opts, visitors)
205 """traverse and visit the given expression structure using
the default iterator."""
206
--> 207 return traverse_using(iterate(obj, opts), obj, visitors)
208
209 def traverse_depthfirst(obj, opts, visitors):
/usr/lib/python2.7/site-packages/sqlalchemy/sql/visitors.pyc in
traverse_using(iterator, obj, visitors)
199 meth = visitors.get(target.__visit_name__, None)
200 if meth:
--> 201 meth(target)
202 return obj
203
/usr/lib/python2.7/site-packages/sqlalchemy/engine/ddl.pyc in
visit_table(self, table, create_ok)
74
75 table.dispatch.before_create(table, self.connection,
---> 76
checkfirst=self.checkfirst)
77
78 for column in table.columns:
/usr/lib/python2.7/site-packages/sqlalchemy/event.pyc in
__call__(self, *args, **kw)
272 fn(*args, **kw)
273 for fn in self.listeners:
--> 274 fn(*args, **kw)
275
276 # I'm not entirely thrilled about the overhead here,
/usr/lib/python2.7/site-packages/sqlalchemy/schema.pyc in
adapt_listener(target, connection, **kw)
484
485 def adapt_listener(target, connection, **kw):
--> 486 listener(event_name, target, connection)
487
488 event.listen(self, "" + event_name.replace('-', '_'),
adapt_listener)
/usr/lib/python2.7/site-packages/sqlalchemy/util/langhelpers.pyc in
__call__(self, *arg, **kw)
279
280 def __call__(self, *arg, **kw):
--> 281 return getattr(self.target, self.name)(*arg, **kw)
282
283 def class_hierarchy(cls):
/usr/lib/python2.7/site-packages/sqlalchemy/types.pyc in
_on_table_create(self, event, target, bind, **kw)
1676 t = self.dialect_impl(bind.dialect)
1677 if t.__class__ is not self.__class__ and isinstance(t,
SchemaType):
-> 1678 t._on_table_create(event, target, bind, **kw)
1679
1680 def _on_table_drop(self, event, target, bind, **kw):
/usr/lib/python2.7/site-packages/sqlalchemy/dialects/postgresql/
base.pyc in _on_table_create(self, event, target, bind, **kw)
451
452 def _on_table_create(self, event, target, bind, **kw):
--> 453 self.create(bind=bind, checkfirst=True)
454
455 def _on_metadata_create(self, event, target, bind, **kw):
/usr/lib/python2.7/site-packages/sqlalchemy/dialects/postgresql/
base.pyc in create(self, bind, checkfirst)
439
440 if not checkfirst or \
--> 441 not bind.dialect.has_type(bind, self.name,
schema=self.schema):
442 bind.execute(CreateEnumType(self))
443
/usr/lib/python2.7/site-packages/sqlalchemy/dialects/postgresql/
base.pyc in has_type(self, connection, type_name, schema)
1037 """
1038 cursor = connection.execute(sql.text(query,
bindparams=bindparams))
-> 1039 return bool(cursor.scalar())
1040
1041 def _get_server_version_info(self, connection):
AttributeError: 'NoneType' object has no attribute 'scalar'
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