[sqlalchemy] Class.query vs DBSession.query(Class)
Hi, There are two styles of writing code for querying: the assignmapper style, i.e. Class.query vs. the standard style as documented in SQLAlchemy tutorial, i.e. DBSession.query(Class). The assignmapper style seems simpler and intuitive. Curious to know why it is not the standard way. Are there any disadvantages? Also refer http://groups.google.co.in/group/turbogears/browse_thread/thread/8f3b4c4da33d69c8 thanks, Sanjay --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] High resolution SQLAlchemy logo
Hi, I think to print SQLAlchemy logo on our company brochure. I think it is permissible. Is not so? Is there a high resolution logo somewhere? thanks Sanjay --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] Getting error while using MapperExtension
Hi,
In a project, I am using MapperExtension this way:
class TaskExtension(MapperExtension):
def populate_instance(self, mapper, selectcontext, row, instance,
**flags):
mapper.populate_instance(selectcontext, row, instance,
**flags)
instance.on_load() # does some custom initialization
It gives me the following exception:
TypeError: ('Task' object is unsubscriptable...
Needing help.
thanks
Sanjay
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[sqlalchemy] Re: Getting error while using MapperExtension
For your call to mapper.populate_instance, you have the arguments for 'row' and 'instance' reversed. Yes! reversing it works perfectly. I had guessed the argument sequence from the MapperExtension.populate_instance, which happens to be reverse. thanks a lot! Sanjay --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] SQLALchemy used at gcollab
Hi All, We have just released www.gcollab.com, a site hosting global collaborative services such as tmail. SQLAlchemy is being used as the database component/ORM of gcollab. My experience with SQLAlchemy has been rewarding and smooth. The documentation is great. The support and response in this forum has been really excellant. I remember in one or two occasions I faced some issues, which Michael responded to and resolved instantly. Grabbing this opportunity to sincerely appreciate and thank Michael and all the people behind SQLAlchemy, for such a great framework, with excellant response and support. Sanjay --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] Re: concurent modification
I think all one can do is just forget and start over again, when concurrent modifications error occurs. That means, catchig the exception and just showing some failure message to the user is all one can do. Sanjay --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] Re: Looking for feedback on encapsulating SA logic (newbie)
mapper(User, users_table) Is not using assign_mapper preferable? --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] Re: session issues in TG - automatic commits happening.
As I recall, this was discussed in TG forum sometime, and there is a nice way to disable this. Searching there might help... Sanjay --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] Re: Concurrency control using version_id_col
Hi Mike, Thanks a lot. It works fine (with or without default=0). The problem was in my TG application, which was not preserving version while populating the edit form. I made version as a hidden field in the form, and it works fine now. Sanjay --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] Concurrency control using version_id_col
Hi,
In order to achieve concurrency control using optimistic locking, we
are doing the following:
1. Adding a column in the table like this:
page_tbl = Table('page', metadata,
Column('page_id', Integer, primary_key=True, autoincrement=True),
Column('link_name', Unicode(30), nullable=False),
.
.
Column('version', Integer, default=0))
2. Mapping like this:
assign_mapper(session.context, Page, page_tbl,
version_id_col=page_tbl.c.version, properties={...})
But it does not seem working. Are we missing any step?
thanks
Sanjay
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[sqlalchemy] Re: In Turbogears, using the same transaction for mapped objects and direct operations
So, cherrypy.request.sa_transaction.connection should work. I had tries that. But it says Exceptions :'function' object has no attribute 'execute' Don't know why. Sanjay --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] Re: In Turbogears, using the same transaction for mapped objects and direct operations
conn = session.context.get_current().connection(SomeMappedClass) conn.execute(...) Thanks! It is exactly what I needed. BTW, the session transaction is stored in cherrypy.request.sa_transaction. Does this help simplify the statements? thanks again, Sanjay --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] In Turbogears, using the same transaction for mapped objects and direct operations
Hi, In a turbogears application that I am developing, in a single transaction, I need to delete certain records of a table, and update another table. the code is something like: from sqlalchemy import * from turbogears import metadata, session . . . document_tbl.delete(document_tbl.c.doc_id.in_(*doc_ids)).execute() website.used_bytes -= size_of_deleted_documents # website is a mapped object. . . Problem is that, the delete statement runs in its own transaction, and not in the same transaction in which the second statement runs. Need help on how to do it. Being a turbogears application where db entities like metadata and session are imported rather than created by me, I am confused and could not successfully implement the pattern provided in the docs. thanks, Sanjay --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] Re: Calling a function (Stored Procedure) returning a recordset
Thanks a lot, Michael and Eric! This long thread has been quite useful to me. Sanjay --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] Re: Calling a function (Stored Procedure) returning a recordset
Further findings and queries on SelectResults:
1. Is SelectResults still needed in certain situations:
a. Observed that SelectResults was having a count() method. If we
don't use SelectResults, either we have to query the database for
getting the count manually, or use len(list). Using 'len' may not be
recommended in paginated data grids.
b. Seeing the TurboGears code for 'paginate', it checks for the type
of variable. If it is a list, it just applies len(list)! Does that
mean, we have to explicitly use SelectResults with TurboGears?
2. SelectResults not behaving properly:
I have some code which returns a list although I expect a
SelectResults. Here is the minimal version reproducing that. Can't
guess whether I am doing something wrong or it's a bug. Need help.
from sqlalchemy import *
from sqlalchemy.ext.assignmapper import assign_mapper
from sqlalchemy.ext.sessioncontext import SessionContext
import sqlalchemy.mods.selectresults
context = SessionContext(create_session)
session = context.current
metadata = BoundMetaData('sqlite:///satest', echo=True)
# table definitions
person_table = Table('person', metadata,
Column('person_id', Integer, primary_key=True, autoincrement =
True),
Column('first_name', Unicode(30)),
Column('last_name', Unicode(30)))
metadata.drop_all()
metadata.create_all()
class Person(object):
pass
assign_mapper(context, Person, person_table)
p1 = Person(first_name=Sanjay, last_name=Patel)
p2 = Person(first_name=Ranjan, last_name=Naik)
session.flush()
del p1
del p2
session.clear()
# persons = Person.select_by(person_id=1)
# assert isinstance(persons,
sqlalchemy.ext.selectresults.SelectResults) # OK
persons = Person.select(Person.c.person_id.in_(1))
assert isinstance(persons, sqlalchemy.ext.selectresults.SelectResults)
# Fails!
Hi Michael,
The post being too long probably was not that clear to draw your
attention. In summary, it tries to justify the need of SelectResults
still in certain situations. Also, it tries to point out what seems
like a bug in SelectResults. Would need your comments help on this.
thanks
Sanjay
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[sqlalchemy] Re: Calling a function (Stored Procedure) returning a recordset
Also SelectResults is deprecated as
Query includes all of its functionality now.
So nice! Does this mean, in laymans term,
1. I do not have to bother writing import
sqlalchemy.mods.selectresults
2. Normal query, whether used raw or through ORM, can supply data to
paginated data grids as efficiently as SelectResults was doing?
Further findings and queries on SelectResults:
1. Is SelectResults still needed in certain situations:
a. Observed that SelectResults was having a count() method. If we
don't use SelectResults, either we have to query the database for
getting the count manually, or use len(list). Using 'len' may not be
recommended in paginated data grids.
b. Seeing the TurboGears code for 'paginate', it checks for the type
of variable. If it is a list, it just applies len(list)! Does that
mean, we have to explicitly use SelectResults with TurboGears?
2. SelectResults not behaving properly:
I have some code which returns a list although I expect a
SelectResults. Here is the minimal version reproducing that. Can't
guess whether I am doing something wrong or it's a bug. Need help.
from sqlalchemy import *
from sqlalchemy.ext.assignmapper import assign_mapper
from sqlalchemy.ext.sessioncontext import SessionContext
import sqlalchemy.mods.selectresults
context = SessionContext(create_session)
session = context.current
metadata = BoundMetaData('sqlite:///satest', echo=True)
# table definitions
person_table = Table('person', metadata,
Column('person_id', Integer, primary_key=True, autoincrement =
True),
Column('first_name', Unicode(30)),
Column('last_name', Unicode(30)))
metadata.drop_all()
metadata.create_all()
class Person(object):
pass
assign_mapper(context, Person, person_table)
p1 = Person(first_name=Sanjay, last_name=Patel)
p2 = Person(first_name=Ranjan, last_name=Naik)
session.flush()
del p1
del p2
session.clear()
# persons = Person.select_by(person_id=1)
# assert isinstance(persons,
sqlalchemy.ext.selectresults.SelectResults) # OK
persons = Person.select(Person.c.person_id.in_(1))
assert isinstance(persons, sqlalchemy.ext.selectresults.SelectResults)
# Fails!
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[sqlalchemy] Re: 'MapperExtension' object has no attribute 'translate_row'
testcase please
Here is the sample code which works perfectly till 0.3.4 and produces
error in newer versions in my system:
from sqlalchemy import *
from sqlalchemy.ext.assignmapper import assign_mapper
from sqlalchemy.ext.sessioncontext import SessionContext
context = SessionContext(create_session)
session = context.current
metadata = BoundMetaData('sqlite:///satest', echo=False)
task_tbl = Table('task', metadata,
Column(task_id, Integer, primary_key=True, autoincrement=True),
Column(descr, Unicode(30), nullable=False))
metadata.drop_all()
metadata.create_all()
class Task(object):
pass
from sqlalchemy import EXT_PASS
class TaskExtension(object):
def get_session(self):
return EXT_PASS
def select_by(self, query, *args, **kwargs):
return EXT_PASS
def select(self, query, *args, **kwargs):
return EXT_PASS
def get_by(self, query, *args, **kwargs):
return EXT_PASS
def get(self, query, *args, **kwargs):
return EXT_PASS
def create_instance(self, mapper, selectcontext, row, class_):
return EXT_PASS
def append_result(self, mapper, selectcontext, row, instance,
identitykey, result, isnew):
return EXT_PASS
def populate_instance(self, mapper, selectcontext, row, instance,
identitykey, isnew):
mapper.populate_instance(selectcontext, instance, row,
identitykey, isnew)
def before_insert(self, mapper, connection, instance):
return EXT_PASS
def before_update(self, mapper, connection, instance):
return EXT_PASS
def after_update(self, mapper, connection, instance):
return EXT_PASS
def after_insert(self, mapper, connection, instance):
return EXT_PASS
def before_delete(self, mapper, connection, instance):
return EXT_PASS
def after_delete(self, mapper, connection, instance):
return EXT_PASS
assign_mapper(context, Task, task_tbl, extension=TaskExtension())
t = Task(descr='xyz')
t.flush()
session.clear()
t = Task.get(1) # produces exception
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[sqlalchemy] Re: 'MapperExtension' object has no attribute 'translate_row'
Your TaskExtension class doesn't have a translate_row method, which apparently is part of the MapperExtension interface (although it doesn't appear in the docs). From the source code (in orm/mapper.py): def translate_row(self, mapper, context, row): Perform pre-processing on the given result row and return a new row instance. This is called as the very first step in the ``_instance()`` method. return EXT_PASS You could make life much easier for yourself by making TaskExtension inherit from MapperExtension. In that way you would only need to implement the methods that you actually want to override, and you won't have to update your extension class every time new extension methods are added. Hope that helps, Simon class TaskExtension(object): MapperExtensions need to subclass the MapperExtension class: class TaskExtension(MapperExtension): Thanks a lot Simon, Michael! I did not read the documentation properly and had missed the inheritence. It indeed makes life a lot simpler. thanks Sanjay --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] Re: Calling a function (Stored Procedure) returning a recordset
tasklist = func.get_tasklist(engine=engine).execute() # is this the correct way? looks fine to me. for the rest of it, im not very familiar with PG stored procedures. I think SQLAlchemy code is translating to SELECT get_tasklist(). But what is actually needed is SELECT * FROM get_tasklist(). So, probably the question is, What SQLAlchemy code will translate to SELECT * FROM get_tasklist(). Needing suggestions. thanks Sanjay --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] Calling a function (Stored Procedure) returning a recordset
Hi,
I have a postgres function returning a set of records (using RETURN
NEXT). While calling the function like this:
tasklist = func.get_tasklist(engine=engine).execute() # is this the
correct way?
I am getting this error:
SQLError: ('(ProgrammingError) set-valued function called in context
that cannot accept a set\nCONTEXT: PL/pgSQL function get_tasklist
line 6 at return next\n', bound method TaskController.get_tasks of
gcollab.controllers.task.TaskController object at 0xb742716c)
'SELECT get_tasklist()' {}
Am I calling the stored procedure correctly? Need help.
thanks
Sanjay
Here is code of the stored procedure:
CREATE OR REPLACE FUNCTION get_tasklist() RETURNS setof tasklist_t AS $
$
DECLARE
t tasklist_t%rowtype;
BEGIN
FOR t IN SELECT task_id, descr, 'Waiting', remind_at, 'Sanjay'
FROM task
LOOP
RETURN NEXT t;
END LOOP;
RETURN;
END;
$$ LANGUAGE PLPGSQL;
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[sqlalchemy] 'MapperExtension' object has no attribute 'translate_row'
Hi, While updated from version 0.3.3 to 0.3.6, I am getting this error: 'MapperExtension' object has no attribute 'translate_row' A bug? Any clues would help. thanks Sanjay --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] Is it possible to know the size of a deferred PickleType?
Hi All, Wondering if it is possible to know the size of a file stored in a deferred column (PickleType), without retrieving the file itself. Thanks in advance. Sanjay --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] Re: Is it possible to know the size of a deferred PickleType?
I usually try to save the filesize as a separate column. Hi Sean, Thanks for the suggestion. I think that might be the only way to know a filesize without retrieving a file. Sanjay --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] Re: Running initialization code after creating/loading an object
Hi Rick, This was exactly what I needed. Thanks a lot! Sanjay (I think I wrote this message yesterday also, which did not appear. Might have pressed the discard button?!) --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] Running initialization code after creating/loading an object
Hi,
I am not able to code this pattern. I read about it at many places, in
doc, FAQ and at
http://groups.google.co.in/group/sqlalchemy/browse_thread/thread/66d0094c671bd5bc,
but still could not do it. May be my noviceness. Needing help. I tried
somethings like this, but it did not help:
from sqlalchemy import *
from sqlalchemy.ext.assignmapper import assign_mapper
from sqlalchemy.ext.sessioncontext import SessionContext
context = SessionContext(create_session)
session = context.current
metadata = BoundMetaData('sqlite:///satest', echo=False)
# table definitions
person_table = Table('person', metadata,
Column('person_id', Integer, primary_key=True, autoincrement =
True),
Column('first_name', Unicode(30)),
Column('last_name', Unicode(30)))
metadata.drop_all()
metadata.create_all()
class Person(object):
@staticmethod
def Create(first_name, last_name):
p = Person(first_name=first_name, last_name=last_name)
p.CallAfterInitializationOrFetchingFromDatabase()
return p
def CallAfterInitializationOrFetchingFromDatabase(self):
self.full_name = self.first_name + ' ' + self.last_name
class PersonExtension(object):
def create_instance(self, mapper, selectcontext, row, Person):
p = Person()
p.CallAfterInitializationOrFetchingFromDatabas()
return p
assign_mapper(context, Person, person_table,
extension=PersonExtension())
p = Person.Create(first_name=Sanjay, last_name=Patel)
Assert p.full_name == Sanjay Patel
p.flush()
del p
session.clear()
p = Person.get_by(person_id=1)
assert p.full_name == Sanjay Patel
I think using __new__ might be simpler, but can't guess how exactly
to use it.
thanks
Sanjay
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[sqlalchemy] Re: Full Text Search using PostgreSQL and tsearch2
Thanks a lot, guys. Will try a sample application and post in the wiki. Might take some time - meanwhile, if somebody gets some more stuff, posting it would help. thankssanjay Really sorry - I could not touch this yet. Have got suddenly busy in preparing for some training, which suddenly creeped in. It might take some more time. Till then if somebody does this, kindly post in the wiki. thanks Sanjay --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] Re: new docs new docs new docs
I present to you Michael Bayer, the amazing multitalented developer of SQLAlchemy--getting more done in one week than the average team of developers does in a month!! Not only is he a very fast coder, but he writes comprehensive documentation for his code--an unheard-of combination of willingness and ability in an open-source developer. Fully seconded. I take SQLAlchemy as a boon to IT industry - particularly while talking Agile development. I can't think agile python frameworks entering enterprise level without it. sanjay --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] Re: Full Text Search using PostgreSQL and tsearch2
Thanks a lot, guys. Will try a sample application and post in the wiki. Might take some time - meanwhile, if somebody gets some more stuff, posting it would help. thanks sanjay --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] Full Text Search using PostgreSQL and tsearch2
Hi All, Trying to implement full text search with PostgreSQL and tsearch2, being a beginner, I am facing some basic hurdles: 1. How to declare a table in SA, I mean, what SA datatype should tsvector correspond to? 2. Can the index be defined using SA, or we need to do it in the backend? 3. Can the trigger for auto update be defined using SA, or we need to do it in the backend? 4. How to frame the query in SA? A reference, tutorial, receipe or at least some key guidance could really help me. Dennis has mentioned in a post - I'm currently doing that with Postgresql(tsearch2) for a project and it works quite well., but I am not being able to guess the pattern. thanks sanjay --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] Re: PostgreSQL - fetching boolean type gives integer type
My system was having PostgreSQL 8.1.4 and psycopg. After Alan's code failing in my system, I doubted on psycopg. With some struggle, I successfully installed psycopg2 and removed psycopg, and things worked! Thanks a lot for the diagnosis, guys. Extremely sorry to have bothered you. Understanding SA docs recommending psycopg2, a few days back I had tried to install it. But it gave some error, and I decided not to bother and be happy with psycopg, as it was working without problems for me for last few months. That was the mistake, which drained this timeeffort of all of us. thanks sanjay --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] table_foo.c.column_foo.autoincrement returning True always
In order to know whether a column is an autoincrement column, I am checking the above flag. But it is returning True always, irrespective of the column. I am using SQLAlchemy 0.3.3, PostgreSQL 8.1.4 and psycopg2 on fedora 5. Wondering whether it's the correct flag, anything is wrong in my system, or it's a bug. thanks sanjay --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] Re: table_foo.c.column_foo.autoincrement returning True always
I am not reflecting the tables. Example code:
from sqlalchemy import *
metadata = BoundMetaData('postgres://user:[EMAIL PROTECTED]/mydb',
echo=True)
company_tbl = Table('company', metadata,
Column('company_id', Integer, primary_key=True,
autoincrement=True),
Column('name', Unicode(30)))
metadata.create_all()
assert company_tbl.c.company_id.autoincrement == True
assert company_tbl.c.name.autoincrement == True# passes!
assert company_tbl.c.name.autoincrement == False # fails!
sanjay
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[sqlalchemy] PostgreSQL - fetching boolean type gives integer type
In PostgreSQL, this code:
{{{
# select a row from website_type_tbl(wtype_id INTEGER PK, show_ads
BOOLEAN)
row = website_type_tbl.select().execute().fetchone()
# insert another row
website_type_tbl.insert().execute(wtype_id=5, show_ads=row.show_ads)
}}}
Produces error - SQLError: (ProgrammingError) ERROR: column show_ads
is of type boolean but expression is of type integer
What happens is, while fetching, boolean columns are fetched as integer
type (0, 1).
I don't know whether it is the expected behaviour or a bug. Bringing
to notice, in case it is a bug.
thanks
sanjay
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[sqlalchemy] Re: PGBigInteger behaving like Integer
Thanks! Again I am overwhelmed by the excellant response!! sanjay --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] Configuration of SelectResults: per Query, per Mapper, or per application?
I am implementing @paginate in a few places in a turbogears application, which needs SelectResults. Wondering whether to configure it for per Query, per Mapper, or per application mode. Seeking suggestions on advantages and disadvantages of each. thanks sanjay --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] Re: SA 0.3.x: performance issues
instance changes get picked up. if you want the more simplistic
comparison method (i.e. using is), set up your PickleType with the
flag mutable=False.
You meant like this?
Column('content', PickleType, mutable=False)
thanks
sanjay
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[sqlalchemy] Selection criteria in a property(one-to-many) of a mapped object
Might be a novice question... Say I have a business object Website, mapped using assign_mapper, having a property(relation to Page object) pages. Needing suggestion on what is a best way to fetch selective pages for a particular website. E.g. website = Website.get(1) # website.pages is a list refering to all pages of an website website.pages(where page_id = 1) # what is the ideal way to do this website.pages(where created_at 21-DEC-2006) # and this pages being a python list, searching for thing iteratively could do the job, but would involve many database fetches. thank sanjay --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
