[sqlalchemy] How to query objects in a session
Hi, I am trying to find some efficient way to query objects stored in the session. Do I have to loop through the session to find all objects which names are John for example or there is some more efficient way to do this. The filter() would be perfect but it is not applicable for the session objects. Thanks, ED -- You received this message because you are subscribed to the Google Groups sqlalchemy group. To view this discussion on the web visit https://groups.google.com/d/msg/sqlalchemy/-/fBs961TS6z4J. 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] Using count and distinct with window function
Hello, I have got a query of the following type: rows = session.query(*[func.count().over().label(count)]+map(lambda column: MyClass.__dict__[columns],columns)).filter(...).limit(n).offset(m).all() it returns the number of results together with values of selected columns. The problem is when I try to apply the distinct query I see that func.count().over().label(count) does not return correct results, that is, it returns the number of results for the query by which the distinct function is omitted. Is there any workaround for this problem? The query contains no joins. Thank you ED -- You received this message because you are subscribed to the Google Groups sqlalchemy group. To view this discussion on the web visit https://groups.google.com/d/msg/sqlalchemy/-/s2PjnmdvWuwJ. 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] Re: Using count and distinct with window function
To put it more clear why: rows = session.query(*[func.count().over().label(count)]+map(lambda column: MyClass.__dict__[columns],columns)).filter(...).limit(n).offset(m).all() works and *rows = session.query(*[func.count().* *over().label(count)]+map(**lambda column: MyClass.__dict__[columns],**columns)).filter(...).distinct().limit(n)**.offset(m).all()* does not? Thanks Am Mittwoch, 16. Mai 2012 12:07:26 UTC+2 schrieb Eduardo: Hello, I have got a query of the following type: rows = session.query(*[func.count().over().label(count)]+map(lambda column: MyClass.__dict__[columns],columns)).filter(...).limit(n).offset(m).all() it returns the number of results together with values of selected columns. The problem is when I try to apply the distinct query I see that func.count().over().label(count) does not return correct results, that is, it returns the number of results for the query by which the distinct function is omitted. Is there any workaround for this problem? The query contains no joins. Thank you ED -- You received this message because you are subscribed to the Google Groups sqlalchemy group. To view this discussion on the web visit https://groups.google.com/d/msg/sqlalchemy/-/W80zRGtGptAJ. 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] Re: Using count and distinct with window function
Hi, I am trying to write this SQL coomand: SELECT DISTINCT(col1, col2,col3) FROM mytable WHERE col1='something' in sqlalchemy form: columns=['col1','col2','col3'] *rows = session.query(*[func.count().over().label(count)]+map(lambda column: MyClass.__dict__[columns],columns))*.filter(...).limit(n).offset(m).all() this query works it returns the results together with the number of hits. The problem is that when I apply the distinct() command *rows = session.query(*[func.count().over().label(count)]+map(lambda column: MyClass.__dict__[columns],columns))*.filter(...).limit(n).offset(m).*distict()*.all() *func.count().over().label(count) does not show the correct number of hits because func.count() relates to all column in table and to those selected - that is col1, col2 and col3 My question is how to write the count function that will correctly count number of distinct hits but only for the selected columns.* I tried with: *func.count().over(partition_by=MyClass.col1,MyClass.col2,MyClass.col3).label(count)* *and it did not work If I want to use:* *func.count(distinct(MyClass.col1,MyClass.col2,MyClass.col3)).over().label(count) only one column is allowed as the input argument for the count() function. Is there any way to solve this? Thanks* Am Mittwoch, 16. Mai 2012 12:07:26 UTC+2 schrieb Eduardo: Hello, I have got a query of the following type: rows = session.query(*[func.count().over().label(count)]+map(lambda column: MyClass.__dict__[columns],columns)).filter(...).limit(n).offset(m).all() it returns the number of results together with values of selected columns. The problem is when I try to apply the distinct query I see that func.count().over().label(count) does not return correct results, that is, it returns the number of results for the query by which the distinct function is omitted. Is there any workaround for this problem? The query contains no joins. Thank you ED -- You received this message because you are subscribed to the Google Groups sqlalchemy group. To view this discussion on the web visit https://groups.google.com/d/msg/sqlalchemy/-/11I7cmn-UaoJ. 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] Re: Using count and distinct with window function
Am Mittwoch, 16. Mai 2012 12:07:26 UTC+2 schrieb Eduardo: Hello, I have got a query of the following type: rows = session.query(*[func.count().over().label(count)]+map(lambda column: MyClass.__dict__[columns],columns)).filter(...).limit(n).offset(m).all() it returns the number of results together with values of selected columns. The problem is when I try to apply the distinct query I see that func.count().over().label(count) does not return correct results, that is, it returns the number of results for the query by which the distinct function is omitted. Is there any workaround for this problem? The query contains no joins. Thank you ED -- You received this message because you are subscribed to the Google Groups sqlalchemy group. To view this discussion on the web visit https://groups.google.com/d/msg/sqlalchemy/-/a2L969rnvmkJ. 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.
Re: [sqlalchemy] Re: Using count and distinct with window function
*SORRY I want to create query that will return as a first element the number of hits * *SELECT COUNT(*) FROM(SELECT (DISTINCT(col1,col2,col3)) FROM mytable where col1='something**' LIMIT 1 OFFSET 2) and in the second part should be values of the hits **SELECT (DISTINCT(col1,col2,col3)) FROM mytable where col1='something**' LIMIT 1 OFFSET 2* *is it possible to solve this with one query I want to avoid having to apply first query.count() and then query.all() to get results is this possible to do this with one query. thanks* * * -- You received this message because you are subscribed to the Google Groups sqlalchemy group. To view this discussion on the web visit https://groups.google.com/d/msg/sqlalchemy/-/xr5fGu1B0yoJ. 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.
Re: [sqlalchemy] Re: Using count and distinct with window function
Am Mittwoch, 16. Mai 2012 19:59:10 UTC+2 schrieb Michael Bayer:
If I put count() the result will be the number of hits I would like to have
both the number of hits and resulting column values for example
[(33,val1,val2,val3),(33, val21,val22,val23),...]
If I execute it with
Session().query(
mytable.c.col1,
mytable.c.col2,
mytable.c.col3).\
distinct().\
filter(mytable.c.col1=='something').\
limit(1).offset(2).\
count()
I get only [33] (for example)
if I use
from_self()
I get an error
ProgrammingError: (ProgrammingError) column anon_1.col1 must appear in
the GROUP BY clause or be used in an aggregate function
Thanks
print Session().query(
mytable.c.col1,
mytable.c.col2,
mytable.c.col3).\
distinct().\
filter(mytable.c.col1=='something').\
limit(1).offset(2).\
from_self(func.count('*'))
or just say count() instead of from_self(), will execute it. you don't
need distinct(col1, col2, col3) here, only DISTINCT col1, col2, col3,
since you aren't applying DISTINCT to a subset of the available columns.
DISTINCT(x, y, z) is a Postgresql-specific extension (see
http://www.postgresql.org/docs/9.0/static/sql-select.html#SQL-DISTINCT )
On May 16, 2012, at 1:50 PM, Eduardo wrote:
*SORRY
I want to create query that will return as a first element the number of
hits *
*SELECT COUNT(*) FROM(SELECT (DISTINCT(col1,col2,col3)) FROM mytable
where col1='something**' LIMIT 1 OFFSET 2)
and in the second part should be values of the hits
**SELECT (DISTINCT(col1,col2,col3)) FROM mytable where col1='something**'
LIMIT 1 OFFSET 2*
*is it possible to solve this with one query I want to avoid having to
apply first query.count() and then query.all() to get results is this
possible to do this with one query.
thanks*
*
*
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[sqlalchemy] Removing duplicates
Hi, Is there any function in sqlalchemy that filters out duplicates? For example the following rows satisfy a query: 1. (john, 23 , lpgh ) 2.(steve , 35 , dbr ) 3. (john ,76, qwe) 4. (mark, 35, epz) I would like that my query results contain only one row with john (either 1 or 3 which one is not important) or with 35 (either 2 or 4). I tried with distinct(col) but it could not do the work. Thanks -- You received this message because you are subscribed to the Google Groups sqlalchemy group. To view this discussion on the web visit https://groups.google.com/d/msg/sqlalchemy/-/xnt0Zo5tSPUJ. 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] Returningquery results with the result number
Hi, In order to avoid bottlenecks I am force to limit the number of returned results using LIMIT and OFFSET. Since I am not returning all results upon a query I need to include the number of hits in the result. somequery.count() somequery.limit(n).offset(m).all() The problem is that response time takes twice as long as for either the count query or the query retrieving results. Is there any way to do this more efficiently, to make a query first, then to count results and return the result chunk defined with LIMIT and OFFSET? What is the best practice for this? Thanks ED -- You received this message because you are subscribed to the Google Groups sqlalchemy group. To view this discussion on the web visit https://groups.google.com/d/msg/sqlalchemy/-/XXZtDSStLO8J. 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] modifying enable_seqscan option
Hi, Is it possible to set this option to off by using sqlalchemy? Thanks Ed -- You received this message because you are subscribed to the Google Groups sqlalchemy group. To view this discussion on the web visit https://groups.google.com/d/msg/sqlalchemy/-/JGkEvUVvoncJ. 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] checking if some object with the given id is in a session
Hi, I create a certain number of objects in a loop, I check if each of the objects is already stored in the session and if it is not I add it to the session. session = Session() for item in items: item1=create_item() if not item1 in session: session.add(item1) session.commit() The problem is that when I add two objects to the session that are not the same but have some id I get the error: get an error sqlalchemy.exc.IntegrityError: (IntegrityError) duplicate key value violates unique constraint Is there any function that directly checks if there two objects with the same id in a session? Thanks -- 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] and_ and or_ combined in query
Hi,
The keys of the following dictionary are column names while values are
lists of options for the column in question:
colvsopt={'column1':['option1','option2'],'column2':
['option3','option4l'],.}
I need to write a query:
SELECT * FROM SOMETABLE WHERE (column1=option1 OR column1=option2) AND
(column2=option3 OR column2=option4) AND ...
in sqlalchemy. I tried almost everything but it did not work my best
try is:
query(tab).filter(and_(*(map(or_(*(map(lambda
cv:tab.columns[col]==cv,colvsopt[col]))for col in colvsopt.keys())
Here I get the error:
sqlalchemy.exc.ArgumentError: filter() argument must be of type
sqlalchemy.sql.ClauseElement or string
Could someone help me with this?
Thanks
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[sqlalchemy] updating of the query results
Dear all,
I make a query to find the highest version of a document and then I
want to set a flag to column actual to 1 (TRUE) to all entries
satisfying the query. I dont want to loop through hits but to set this
flag in a one stroke with update. However I get this error:
sqlalchemy.exc.InvalidRequestError: Could not evaluate current
criteria in Python. Specify 'fetch' or False for the
synchronize_session parameter. (Related to the line with update
function!!). What is the problem or is there any alternative?
Thanks
metadata,session,engine=myf(confile)
mytab = Table(dbname, metadata, autoload=True)
class SomeTable(object):
pass
mapper(SomeTable,mytab).compile()
vquery=session.query(func.max(mytab.columns['version']),mytab.columns['id']).group_by(mytab.columns['id'])
endquery=session.query(mytab).filter(tuple_(mytab.columns['version'],mytab.columns['id']
).in_(vquery))
endquery.update({mytab.columns[actual]:1})
ses.commit()
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[sqlalchemy] killing idle processes
Hi,
I made simple query to a potgres DB:
___
engine=create_engine(path)
metadata=MetaData()
Session=sessionmaker(bind=engine)
session=Session()
session.execute('SELECT value FROM table)
.
.
session.close()
_
However execution of this code creates an idle process. How can I
prevent this?
Thanks
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[sqlalchemy] ordering slices of the result
Hello,
I have a query which results (columns id,name) I need to order
alphabetically by name.
Then I need to take a slice of the results and to keep them ordered:
results=somequery.order_by(datab.columns['name'])
slices=results.slice(start,end)
res={}
for slice in slices:
res[str(slice[0])]=str(slice[1])
for id in res.keys():
print id, res[id]
_
the print line however does not show that id, name (res[id]) pairs
ordered alphabetically. Does anyone know why?
Thanks
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[sqlalchemy] Re: group_by argument as a result of a query
Here is the example: column_names = session.query(tab.c.name).filter(tab.c.value==354) column_names = [column_name for (column_name,) in column_names] query=sess.query(func.max(tab.columns['name']),datab.columns['article_id']).group_by(*column_names).all() I get an error here: ProgrammingError: (ProgrammingError) syntax error at or near .6 LINE 2: ... GROUP BY fde.ck1.LKUT.RAT-ES.vertic.6hpa.low.6hdfjks.rih On Aug 12, 7:14 pm, Michael Bayer mike...@zzzcomputing.com wrote: can you please illustrate a simple SQL statement that illustrates what you are trying to achieve ? On Aug 12, 2011, at 1:00 PM, Eduardo wrote: Dear all, I am trying to limit group_by function only on the rows that satisfy certain query if I use group_by(table.c.something) this pertains to whole table. I tried to use elements of the tuple rendered as a result of a query as arguments (as it has been suggested on this forum) but it did not work. Is this possible at all? Thanks -- 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 athttp://groups.google.com/group/sqlalchemy?hl=en. -- 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] Re: group_by argument as a result of a query
This I want to do: 1) I want to find all names that satisfy this query column_names = session.query(tab.c.name).filter(tab.c.value==354) 2) Among those rows I want to find those with the highest id ( all rows with the same name are fist grouped and only the one with the highest id is retained the rest is discarded). Each of the names satisfying the query 1 will be represented with one row having the highest id: column_names = [column_name for (column_name,) in column_names] query=sess.query(func.max(tab.c.id),tab.c.name).group_by(*column_names).all() Is there any better way to do this? Thanks -- 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] bulk selection
Dear All, I have a list of elements for which I need to establish if they are in a tadabase. I can make for each element a separate query but I am afraid that that is not the best approach what is the best practice in this case? Thanks -- 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] group_by argument as a result of a query
Dear all, I am trying to limit group_by function only on the rows that satisfy certain query if I use group_by(table.c.something) this pertains to whole table. I tried to use elements of the tuple rendered as a result of a query as arguments (as it has been suggested on this forum) but it did not work. Is this possible at all? Thanks -- 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] The capacity of the session
Dear all, How can I determine the number of objects (the memory capacity) that a session can take? How can I determine the size of an object? Thanks -- 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] Re: group_by by the result of some other query
Hi Thanks for the answer, This is my query column_names = session.query(tab.c.name).filter(tab.c.value==354) column_names = [column_name for (column_name,) in column_names] query=sess.query(func.max(tab.columns['name']),datab.columns['article_id']).group_by(*column_names).all() I get an error here: ProgrammingError: (ProgrammingError) syntax error at or near .6 LINE 2: ... GROUP BY fde.ck1.LKUT.RAT-ES.vertic.6hpa.low.6hdfjks.rih What does this mean? Thanks ^ 'SELECT max(sometable.name) AS max_1, sometable.id AS sometable_id \nFROM sometable GROUP BY fde.ck1.LKUT.RAT-ES.vertic.6hpa.low. 6hdfjks.rihfjkdp1.fhsdjk00-1900.nhgtec,. On Aug 11, 7:34 am, Andrew Taumoefolau zen...@gmail.com wrote: Hi Eduardo, group_by accepts strings, so this is certainly possible. You might do it like so: # build our column names query # execute and a build a list of strings from our query # group the results of query1 by the list of column names we just created query1 = query1.group_by(*column_names) Cheers, Andrew Taumoefolau andrew.taumoefo...@gmail.com On 11/08/2011, at 2:43 AM, Eduardo wrote: Dear all, I am trying to find a way to limit group_by arguments of one query only to the values of some other query. Is this doable? If yes how to do that. This is an example how query looks like: query1.group_by(sesion.query(tab.columns['name']).filter(datab.columns['value']==354).all()) Thanks -- 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 athttp://groups.google.com/group/sqlalchemy?hl=en. -- 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] group_by by the result of some other query
Dear all, I am trying to find a way to limit group_by arguments of one query only to the values of some other query. Is this doable? If yes how to do that. This is an example how query looks like: query1.group_by(sesion.query(tab.columns['name']).filter(datab.columns['value']==354).all()) Thanks -- 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] How to optimize the max group wise query
Dear all, I have the following query that is made of 3 queries on only ONE TABLE: 1. Step simple normal query somequery=session.query(tab.columns['name'],tab.columns['id']).filter(tab.columns['value']==6) 2. Step: finding the max serial number for each serie maxquery=session.query(func.max(tab.columns['serial_number']),datab.columns['serie']).group_by(datab.columns['serie']) 3. Step: find name and id of each row satisfying query from Step1 having maximal serial number in a serie finalquery=somequery.filter(tuple_(tab.columns['serial_number'],datab.columns['serie']).in_(fidq)) Is there any more efficient way to do this? I am especially not thrilled with the step 3 (creating tuples and then searching equivalents from the results of the query 2). I think it is very cost- intensive. Remark: All rows with the same name and id also have the same serie attribute. Thanks -- 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] Are data really in database using session.comit
Daer all I have a following problem : Session = sessionmaker(bind=engine) session = Session() for item in items: item1 = session.query(item) if len(item1)==0: session.add(item1) session.commit() The session is valid for a loop and I write items in a database during each iteration. Can it happen that if an item is identical to the previous one, the session.commit() will not make it to write the previous item in the database before the query of the next iteration is executed and the next session.commit() will fail because of sqlalchemy.exc.IntegrityError: (IntegrityError) duplicate key value violates unique constraint. How can I make sure that the previous item is already in the database before the query in the next iteration is carried out? Thanks -- 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] intersecting query with different numbers of selectables
Dear all,
I have 2 queries:
1)
query1=session.query(func.max(datab.columns['counter']).label('t1')).group_by(datab.columns['site'])
query2=session.query(tab.columns['name'],tab.columns['id'],tab.columns['counter']).filter(datab.columns['visits']==15)
Now I would like to get all pairs
(tab.columns['name'],tab.columns['id']) having the counter attribute
that satisfy query1. I tried subqueries and joins but to no avail.
How to solve this?
Thanks
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[sqlalchemy] writing a (sub)query
I have the following statement : SELECT name, id, division, value, FROM ( SELECT name, id, division,value, max(value) over (partition by division) as max_val FROM tab1 ) WHERE value = max_val I try to turn this sql statement into a Query object I tried this sqlquery=session.query(sometab) sqlquery.statement= SQL QUERY GIVEN ABOVE but it does not work because statement cannot be set directly. What is get-around for this? Can this statement be written as a subquery? If yes, how? I saw several example of subqueries on the internet but none of these seem to be suitable for this statement. Thanking in advance Eddie -- 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] Re: information about filed create_engine
/.../.../python2.6/site-packages/SQLAlchemy-0.6.5-py2.6.egg/sqlalchemy/
dialects/postgresql/psycopg2.py, line 234, in dbapi
psycopg = __import__('psycopg2')
ImportError: No module named psycopg2
The module psycopg2 is already installed in the site-packages
directory. I even included the path in the system variable by :
sys.path.append('/.../.../python2.6/site-packages/') in the wsgi
script.Still it won't work.
Why?
On Jul 18, 5:23 pm, King Simon-NFHD78
simon.k...@motorolasolutions.com wrote:
-Original Message-
From: sqlalchemy@googlegroups.com [mailto:sqlalchemy@googlegroups.com]
On Behalf Of Eduardo
Sent: 18 July 2011 15:54
To: sqlalchemy
Subject: [sqlalchemy] Re: information about filed create_engine
Yes, I use wsgi server of the python library bottle and I don't have
any problem but when I want to use the same script via the apache web
server I get only a server error no exception could be caught not
even
by using the code snippet from you (Thanks by the way). I simply
included many print lines that appear in the error log file. The
create_engine fails (I know it from try and except) but I cannot
catch
any exception that sheds some light on the reason of the failure.
If you are getting a generic server error from Apache, you'll normally
find the reason in the Apache error log (the location depends on your
installation, but typically it is something like
/var/log/httpd/error_log. Does that shed any light on the problem?
Simon
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[sqlalchemy] Re: information about filed create_engine
I dont get any log. The access strings from the local and wsgi applications are identical so the script should connect to the same database. I encountered problems with create_engine. What type of exception can this method throw? The application catches: TypeError, ValueError and OperationalError. Is there any other Error or some universal sqlalchemy error that can indicate me where the problem is? Thanks On Jul 14, 3:43 pm, King Simon-NFHD78 simon.k...@motorolasolutions.com wrote: Eduardo wrote: On Jul 14, 10:49 am, King Simon-NFHD78 simon.k...@motorolasolutions.com wrote: Eduardo wrote When I use the same script with a standalone application it works but when I try to run it as a wsgi application it fails (wsgi logs does not contain any information regarding the failure!) Try turning on SQL logging (either by passing echo='debug') to create_engine, or by configuring the python logging package as described onhttp://www.sqlalchemy.org/docs/core/engines.html#configuring- logging. Then you should see the SQL being issued and the results coming back from the database. How are you configuring transactions? Is it possible that the transaction isn't being committed at the end of the web request, so any changes you've made are being discarded? Simon My application only queries the database there are no inputs and therefore no transactions involved. What was the result of turning on SQL logging? Are you sure you're even pointing at the same database that you were when you ran the standalone script? Try printing the value of session.bind.url (or including it in HTTP response, if you don't have easy access to the stdout from your wsgi script) Simon -- 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] Re: information about filed create_engine
Yes, I use wsgi server of the python library bottle and I don't have
any problem but when I want to use the same script via the apache web
server I get only a server error no exception could be caught not even
by using the code snippet from you (Thanks by the way). I simply
included many print lines that appear in the error log file. The
create_engine fails (I know it from try and except) but I cannot catch
any exception that sheds some light on the reason of the failure.
On Jul 18, 4:06 pm, King Simon-NFHD78
simon.k...@motorolasolutions.com wrote:
-Original Message-
From: sqlalchemy@googlegroups.com [mailto:sqlalchemy@googlegroups.com]
On Behalf Of Eduardo
Sent: 18 July 2011 14:12
To: sqlalchemy
Subject: [sqlalchemy] Re: information about filed create_engine
I dont get any log. The access strings from the local and wsgi
applications are identical so the script should connect to the same
database. I encountered problems with create_engine. What type of
exception can this method throw?
The application catches: TypeError, ValueError and OperationalError.
Is there any other Error or some universal sqlalchemy error that can
indicate me where the problem is?
Thanks
I'm sorry - I still don't understand your setup. How do you know that
you've encountered problems with create_engine if you're not getting
any kind of exception from it?
If you really think that create_engine is failing but the exception is
being caught silently, why not change your code so that you've got an
exception handler around create_engine:
try:
engine = create_engine(your_connection_string)
except Exception, e:
import traceback
log_file = open('/tmp/sqlalchemy_errors', 'w+')
log_file.write('Exception from create_engine\n')
log_file.write('%s\n' % e)
log_file.write(traceback.format_exc())
raise
But your life would be much easier if you learnt how to configure
SQLAlchemy's built-in logging features:
http://www.sqlalchemy.org/docs/core/engines.html#configuring-logging
What WSGI server and web framework are you using (if any)? It sounds
like they are hampering your efforts to debug this. You might find it
easier to run a very simple wsgi server such as the one in the wsgiref
module:
http://docs.python.org/library/wsgiref.html#module-wsgiref.simple_server
Simon
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[sqlalchemy] Re: intersect_all vs chaining of filter
Then what is the purpose of the intersection method? It looks to me as a (bad) alternative to chained filtering!! Can you think of any case when intersection is better choice than filters? On Jun 23, 4:08 am, Mike Conley mconl...@gmail.com wrote: On Tue, Jun 21, 2011 at 6:05 AM, Eduardo ruche...@googlemail.com wrote: What is the best practice: to chain filters or to collect queries in a list and then apply intersect_all()? Overall efficiency will depend on the underlying database engine, but I can't help but expect that most databases will be more efficient with the chained filters query. It would take a really smart optimizer to make the intersect method as efficient as the chained filter. Using an unrealistic set of queries, but it shows the principle. Using intersect_all will generate SQL like this: q1 = sess.query(Book).filter(Book.title=='A') q2 = sess.query(Book).filter(Book.title=='B') q3 = sess.query(Book).filter(Book.title=='C') q4 = sess.query(Book).filter(Book.title=='D') q5 = q1.intersect_all(q2,q3,q4) SELECT anon_1.book_bookid AS anon_1_book_bookid, anon_1.book_title AS anon_1_book_title, anon_1.book_authorid AS anon_1_book_authorid FROM (SELECT book.bookid AS book_bookid, book.title AS book_title, book.authorid AS book_authorid FROM book WHERE book.title = ? INTERSECT ALL SELECT book.bookid AS book_bookid, book.title AS book_title, book.authorid AS book_authorid FROM book WHERE book.title = ? INTERSECT ALL SELECT book.bookid AS book_bookid, book.title AS book_title, book.authorid AS book_authorid FROM book WHERE book.title = ? INTERSECT ALL SELECT book.bookid AS book_bookid, book.title AS book_title, book.authorid AS book_authorid FROM book WHERE book.title = ?) AS anon_1 Chaining filters generates this SQL: q7 = sess.query(Book).filter(Book.title=='A') q7 = q7.filter(Book.title=='B') q7 = q7.filter(Book.title=='C') q7 = q7.filter(Book.title=='D') SELECT book.bookid AS book_bookid, book.title AS book_title, book.authorid AS book_authorid FROM book WHERE book.title = ? AND book.title = ? AND book.title = ? AND book.title = ? -- Mike Conley -- 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] Re: information about filed create_engine
When I use the same script with a standalone application it works but when I try to run it as a wsgi application it fails (wsgi logs does not contain any information regarding the failure!) On Jul 14, 10:16 am, King Simon-NFHD78 simon.k...@motorolasolutions.com wrote: Eduardo wrote On Jul 13, 7:11 pm, King Simon-NFHD78 simon.k...@motorolasolutions.com wrote: Eduardo wrote Hi, I am trying to prompt an answer from a database after failed create_engine command. I searched through the source code and I found TypeError, and ValueError returns but they relate (if I understood well only to the access parameters). My problem is that I am sure that my access parameters are correct but for some reason the creation of the engine fails. Is there any way to get information why the engin could not be created. The access to db log files is not granted! Thanks What kind of database are you trying to connect to? Are you getting a Python exception, and if so, can you show us the traceback? Simon !) PostgresSQL 2) I don't get any Python exception. So how do you know it's failing then? Simon -- 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] Re: information about filed create_engine
My application only queries the database there are no inputs and therefore no transactions involved. On Jul 14, 10:49 am, King Simon-NFHD78 simon.k...@motorolasolutions.com wrote: Eduardo wrote When I use the same script with a standalone application it works but when I try to run it as a wsgi application it fails (wsgi logs does not contain any information regarding the failure!) Try turning on SQL logging (either by passing echo='debug') to create_engine, or by configuring the python logging package as described onhttp://www.sqlalchemy.org/docs/core/engines.html#configuring-logging. Then you should see the SQL being issued and the results coming back from the database. How are you configuring transactions? Is it possible that the transaction isn't being committed at the end of the web request, so any changes you've made are being discarded? Simon -- 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] intersect_all vs chaining of filter
What is the best practice: to chain filters or to collect queries in a list and then apply intersect_all()? Thanks -- 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] grouping of a query results after select_all()
Dear Sirs, My problem is following as follows I have multiple of queries that I save in a list. When I have all my queires in the list I apply intersect_all method q=qlist[0].intersect_all(*qlist[1:]) I get my result simply by res=q.all() However I would like to group results according to some other column q1=q.group_by(tableints.columns['name']) However if I try res=q1.all() I get the error message meaning that I have to apply group_by for each of the wueries stored in the list. Is there any way to applygroup_by only one for all queries in the list? Thanks -- 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] Creating table with oracle
Hi,
I want to create the following table:
Table('Error', metadata,
Column('Type', String),
Column('reference', String),
Column('context', String),
Column ('Timestamp', DateTime, primary_key=True),)
with the oracle DB. I receive this:
sqlalchemy.exc.Error: (DatabaseError) ORA-00910: specified length too
long for its datatype
'\nCREATE TABLE Error (\n\tType VARCHAR(None CHAR), \n
\treference VARCHAR(None CHAR), \n\tcontext VARCHAR(None CHAR), \n
\tTimestamp DATE\n)\n\n' {}
I tried it with the postgres it works.
Is there any configuration option that makes the oracle accept this
table without changing the given data types?
Thanks
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[sqlalchemy] Managing connections for undefined number of parallel processes
Dear all, My application create parallel processes that access and query a database. My problem is that I can not use engine or connection object in any of these processes because they can not be pickled (requirement for the input arguments for functions that trigger processes). Is there any way to use the URL string to identify existing connection(s). In this case I could use the url to obtain existing connection and to bind a session created in each process to it. Does the reducing the number of connections necessarily results in faster query and storage of the data in a database? Is there any other option to keep number of connection optimal for an arbitrary number of processes? I have seen that there is a way to create an instance of pool class with the url string - I would like to know if I create this instances in each of my processes, is a new pool going to be created each time Pool class has been instantiated? Thank you -- 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] pickling an engine onject
Hi, I saw that there is a way to serialize a query object is there a way to serialize an engine object? Thanks -- 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] The number of connection exceeded
Dear all, I am writing an application to scan a directory system and store metadata in DB. For each directory I create a separate process in which scanning and metadata feed is performed. Now I have following problems: 1) I am forced to start a session in each process and bind them for the engine engine = create_engine(dbfile, poolclass=NullPool) With other poolclass (including default) I get the error that number of connection are exceeded for the non super users. Is this common practice to handle this (I mean NullPool) or are there any way to get around this. How NullPool option affects the performance of the DB? 2) I create a loop in which various operation are performed (adding, deleting, updating of each instances): for elem in mydict: . . session.add(someinst) . . session.delete(inst2) . session.refresh(inst3) I am concerned about performance issues . Should I commit changes: after each operation (add, delete, refresh), after each loop or after the loop has run its course? Is there any advantage if I create a new session for each operation and then close it. Is it how the data get faster into the DB? Thank you in advance -- 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] polymorphic single table inheritance with __mapper_args__ automagically set
Hello everyone:
I'm having some trouble with polymorphic single table inheritance. I
want my subclasses (Ferrari is a subclass of Car) to have the
__mapper_args__ automatically set. How could I do that. I've got this:
class Car(Base):
__tablename__ = 'car'
id = Column(Integer, primary_key=True)
class_name = Column(Unicode(128), nullable=False)
__mapper_args__ = {polymorphic_on:class_name,
polymorphic_identity:Car, with_polymorphic:*}
#...@classproperty
#def __mapper_args__(cls):
#if cls.__name__ == Car:
#return {polymorphic_on:cls.class_name,
polymorphic_identity:Car, with_polymorphic:*}
#else:
#return {polymorphic_identity:cls.__name__}
parent_id = Column(Integer, ForeignKey('car.id'))
children = relation(Car, backref=backref('parent', remote_side=id))
def __init__(self):
pass
def max_speed(self):
return 1000 km/h
class Ferrari(Car):
__mapper_args__ = {polymorphic_identity:Ferrari}
def __init__(self):
Car.__init__(self)
def max_speed(self):
return 320 km/h
I know that it doesn't make much sense for a car to have parent and
children cars, but that's what I need. So once the tables are created
in the db, I do something like:
parent_car = Car()
child_car = Ferrari()
child_car.parent = parent_car
orm.add(parent_car)
orm.add(child_car)
orm.commit()
print parent_car.children[0].max_speed()
print orm.query(Car).filter(Car.id ==
parent_car.children[0].id).one().max_speed()
And it works fine (prints 320 km/h twice)... but if I comment out
the __mapper_args__ lines in Car and Ferrari and uncomment the
@classproperty, it doesn't work fine because class_type doesn't get
properly set (i.e. its value is None) and I get a class_type cannot
be NULL exception. How could I fix it?
Thanks in advance,
Eduardo.
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[sqlalchemy] Re: Polymorphic across foreign key
On May 15 2008, 6:27 pm, Michael Bayer mike...@zzzcomputing.com wrote: On May 15, 2008, at 12:12 PM, J. Cliff Dyer wrote: How can I use this field for polymorphism? Is it possible? polymorphicdiscriminators are currently table-local scalar columns. So if you had a many-to-one of discriminators, youd currently have to encode the discriminator to the primarykeyidentifier of each discriminotor. We will eventually allow a python function to be used as a discriminator as well which you can use to add a level of abstraction to this (you'd preload the list of discriminiator objects and again map based on primarykey). Hello! Two years later.. :P Are we going to get a python function to be used as a discriminator soon? I would think that it would not be very difficult to implement, right? As shown in my previous emails in the thread Model factory, that would solve my problem. I have the python function already written, but I don't know how to make sqlalchemy call to it. I thought that using a composite field should work, but it doesn't because as you say, it's not a table-local scalar column. If the problem is the proxy_set is not set, maybe I can set the proxy_set var to the composite_field somehow? Regards, Eduardo Robles Elvira. -- You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalch...@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.
Re: [sqlalchemy] Model factory
On Fri, Aug 20, 2010 at 10:34 AM, Daniel Kluev dan.kl...@gmail.com wrote:
On Fri, Aug 20, 2010 at 7:39 AM, Eduardo Robles Elvira edu...@gmail.com
wrote:
Now, these functions reimplemented in the inherited class models might
be called by the jobs view. It would be very convenient if directly
when I get the jobs from the database with sqlalchemy I could directly
get them in CustomJobA, CustomJobB instances, instead of all being
instances from the base clas Job. There's a field in the base Job
class which tells me which class type it is (basically, it's
path.to.module and then ClassName).
SQLAlchemy supports this out of the box.
http://www.sqlalchemy.org/docs/reference/ext/declarative.html#single-table-inheritance
So it will be something like this:
class Job(Base):
class_name = Column(Unicode(64))
__mapper_args__ = {'polymorphic_on': class_name}
class CustomJobA(Job):
__mapper_args__ = {'polymorphic_identity': 'CustomJobA'}
SQLAlchemy will then load correct class instance for you on queries,
depending on the value of the field.
--
With best regards,
Daniel Kluev
Thanks Diez and Daniel for the responses. It seems that this is the
way to go, but it's not quite there yet: now I can indeed load the
correct lass instance for my queries, but it seems to be restricted to
inherited classes already loaded in my current module. What would like
to do is being to do something more similar to (conceptually!):
class Job(Base):
class_path = Column(Unicode(64)) # for example CustomJobA
module_path = Column(Unicode(64)) # maybe plugins.myplugin.path.to.module
def get_class_name(self):
modz = __import__(self.module_path, fromlist=[True])
clazz = getattr(modz, self.class_path)
globals()[clazz.__name__] = clazz
class_name = property(get_class_name)
__mapper_args__ = {'polymorphic_on': class_name}
then, in plugins/myplugin/path/to/module.py:
class CustomJobA(Job):
__mapper_args__ = {'polymorphic_identity': 'CustomJobA'}
Where I don't necessary have the class CustomJobA from module
plugins.myplugin.path.to.module imported in the first place, but it
will be loaded. Of course, what I just wrote up there seems reaally
hacky and probably there's a better way? To be honest, I haven't even
tested if it even works yet.
Regards,
Eduardo RE.
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[sqlalchemy] Model factory
Hello everyone: This is my first post in this mailing list/group. My question is simple: is there some way to tell sqlalchemy which method should be called to instance models? Now, some background: I'm working in a project with plugins support. In the project core I've got a Job class model. There's also a model view (I'm using web.py) which shows information about the jobs. Plugins can extend the Jobs, inheriting from them. They won't need to add any new column to the model, just reimplement some base functions for convenience. So I might have the class CustomJob which inherits the model class Job. Now, these functions reimplemented in the inherited class models might be called by the jobs view. It would be very convenient if directly when I get the jobs from the database with sqlalchemy I could directly get them in CustomJobA, CustomJobB instances, instead of all being instances from the base clas Job. There's a field in the base Job class which tells me which class type it is (basically, it's path.to.module and then ClassName). I can define a factory method that given a base job instance, or something similar, can return an instance of the correct model. The simplest way to work around this problem is to put that function as a member function called def instance(self): inside the base Job class, and then anyone who needs it calls job.instance() to get an instance of the needed class, but it's a bit troublesome. I'd like it to be more transparent. The job instance should be given to me directly of the class type needed. So the question I mentioned earlier remains: is there some way to tell sqlalchemy which method should be called to instance models? I've seen http://www.sqlalchemy.org/docs/reference/ext/declarative.html#inheritance-configuration and http://www.sqlalchemy.org/docs/reference/ext/declarative.html#class-constructor but there doesn't seem to be a straightforward to do what I need. Also I saw that someone in this list did something similar, but much more complicated: http://groups.google.com/group/sqlalchemy/browse_thread/thread/9dfa457a7903f684/dd102bcb86dd905b Any ideas, suggestions? Regards, Eduardo RE -- You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalch...@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] Re: SQLAlchemy Sphinx Documentation Preview
Hi, There are some sphinx system messages on: http://www.sqlalchemy.org/docs/sphinxtest/intro.html Reference Documentation¶ * System Message: WARNING/2 (/home/classic/dev/sphinx/doc/build/intro.rst) undefined label: datamapping – if you don't give a link caption the label must precede a section header. - A comprehensive walkthrough of major ORM patterns and techniques. * System Message: WARNING/2 (/home/classic/dev/sphinx/doc/build/intro.rst) undefined label: session – if you don't give a link caption the label must precede a section header. - A detailed description of SQLAlchemy's Session object * System Message: WARNING/2 (/home/classic/dev/sphinx/doc/build/intro.rst) undefined label: engines – if you don't give a link caption the label must precede a section header. - Describes SQLAlchemy's database-connection facilities, including connection documentation and working with connections and transactions. * System Message: WARNING/2 (/home/classic/dev/sphinx/doc/build/intro.rst) undefined label: pooling – if you don't give a link caption the label must precede a section header. - Further detail about SQLAlchemy's connection pool library. On Wed, Dec 3, 2008 at 11:36 PM, Michael Bayer [EMAIL PROTECTED] wrote: We've created a new branch and are in the process of migrating all of our documentation over to Sphinx. The process has gone well and we have a working demo of the full system online. By converting to Sphinx, we get the huge advantage of being on a standardized platform that everyone can understand and contribute towards. All kinds of wacky old code, some of it four or more years old, has been removed (and we thank it for its service). The docs are now split into Main Documentation and API Reference. Because Sphinx allows very flexible layout of docstring-generated documentation, Main Documentation is shrinking and the docstrings used by API Reference, which is an all new section that replaces the old straight down modules display, are growing dramatically, which means more documentation is centralized across the site/pydocs and there's less redundancy. What we are now looking for with regards to the demo is: - comments/suggestions regarding layout, styling. Some layout changes were forced by Sphinx, and others (most) are improvements that Sphinx allowed us to achieve. I'm not a CSS guru or a designer so suggested patches to the CSS and templates would be welcome. If Todd Grimason is out there, feel free to chime in :) . - proofreaders. The content on the demo is maybe 60% of the way there and we're combing through finding issues related to the Sphinx conversion, as well as things that have just been wrong all along. We would love to get patches against the doc build correcting as many issues as possible. - authors. No excuses now , we're on the most standard platform there is for docs. If you have better verbiage for sections or docstrings which aren't clear, are nonexistent (like many of the dialects) or are out of date (theres lots), we want to see suggestions. More elaborate suggestions regarding new sections and organization are welcome too as the structure is completely open ended. - people who understand LaTex to work on the PDF side of things. This one's totally over my head as far as how to get a pdf file out of this thing (pdflatex is fairly inscrutable on a mac). Sphinx 0.6 is required, which at the time of this writing is not yet released so you'll have to check out Sphinx from its mercurial repository if you want to do builds. View the content online at: http://www.sqlalchemy.org/docs/sphinxtest/ Checkout the SVN branch and do a build: http://svn.sqlalchemy.org/sqlalchemy/branches/sphinx --~--~-~--~~~---~--~~ 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 -~--~~~~--~~--~--~---
