[sqlalchemy] Re: Declaring compound primary key on reflective model
Thanks!
On Jun 10, 1:06 pm, A.M. age...@themactionfaction.com wrote:
On Jun 10, 2011, at 2:25 PM, Cody Django wrote:
Hi all -- I'm new on pylons, coming from a django background. I'm
working on a mapfish project.
I'd like to autoload a model based on a db table, but in doing so I
get the error could not assemble any primary key columns for mapped
table.
The table itself is a postgres view with no declared primary key
column, so it makes sense that no primary key columns are detected.
I figure it is possible to define which columns to use as the primary
key in the __table_args__ dict, but I have yet to figure out exactly
how.
Tips, please!
I do the same thing:
newtable = Table(name,
meta,
*props,
autoload=True
)
where props = ColumnCollection(Column('id',Integer,primary_key=True))
SQLAlchemy overwrites the autoloaded info with the passed-in column info.
Cheers,
M
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[sqlalchemy] What is the Sqlalchemy syntax for having ORDER BY and LIMIT on DELETE
Hi, I am using Sqlalchemy 0.6.5 . How do I generate the following statement usin Sqlalchemy expressions (not ORM). DELETE FROM table ORDER BY timestamp LIMIT 10; TIA -- 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.
Re: [sqlalchemy] What is the Sqlalchemy syntax for having ORDER BY and LIMIT on DELETE
That's a MySQL specific syntax you might be better off not using, perhaps you could say delete from table where id in (select id from table order by timestamp limit 10). To get the exact statement, it's probably easiest just to emit the string SQL. If you wanted the sqlalchemy.sql.delete() construct to do it you'd need to subclass Delete, add order_by() and limit() to it, and augment its compilation as described in http://www.sqlalchemy.org/docs/core/compiler.html On Jun 13, 2011, at 10:10 AM, Moshe C. wrote: Hi, I am using Sqlalchemy 0.6.5 . How do I generate the following statement usin Sqlalchemy expressions (not ORM). DELETE FROM table ORDER BY timestamp LIMIT 10; TIA -- 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. -- 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: Odd behaviour of echo flag
Forgot to mention - this happens with SQLAlchemy versions 0.6.7 and 0.6.8. -- 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: Odd behaviour of echo flag
Thanks for the detailed explanation, Mike. It makes complete sense - I missed the fact that a new Connection was being created under the hood at different times in the two different scenarios. Regards, Vinay Sajip -- 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] Deferred loader for attribute for Table having large number of columns.
Hello,
I am using SQLAlchemy-0.7.1 and i am facing Deferred loader for attribute
Error while trying to access the table columns in my code.
I have table with huge number of columns around 200 fields and i have
defined the schema and entity with hybrid declarative_base approach as
below.
I have some sample testcases to assert newly inserted values in db with
normal python assert statements. When i run my sample test cases i am
getting
following error:
KeyError: Deferred loader for attribute 'is_updated' failed to populate
correctly
Below is my code example due to large number of columns i have not defined
entire db Table definition here.
test_table = Table(test_table, metadata,
Column('test_table_idn', Integer, primary_key=True),
Column('test_parent_table_idn', Float, ForeignKey('parent_table_idn')),
Column('name', String(10)),
Column('is_exported', Integer),
.
.
. #Other columns go here.
. #Other columns go here.
. #Other columns go here.
.
.
.
Column('is_updated', Integer)
)
class TestTable(Base):
___table___ = test_table
def set_all_other_attribs(self, **kwargs):
#Common method to set other column attributes.
for key, value in kwargs:
self.key = value
class TestTableInserts(TestCase):
def setUp():
self.session = will get session object
def test_run(self):
tbl_obj = TestTable()
dict_to_set(name='test',is_exported=1,.is_updated=1)
tbl_obj.set_all_other_attribs(dict_to_set)
self.session.add(tbl_obj)
self.session.commit()
#Now trying to assert the records in test_table
result = self.session.query(TestTable).filter(name ==
'test').first()
assert result.name == 'test'
assert result. http://result.name/user_access == 1
assert result. http://result.name/web_addr == 'www.myweb.org'
assert result.is_updated == 1
#When i tryied to assert the above is_updated column i am getting
#KeyError: Deferred loader for attribute 'is_updated' failed to
populate correctly
def tearDown(self):
self.session.execute('delete from test_table')
self.session.close()
File /var/dev/SA/SampleTest/test_sample/test_insert.py, line 79, in
test_run
assert result.is_updated == 1
File
/var/dev/SA/SampleTest/eggs/SQLAlchemy-0.7.1-py2.6-linux-i686.egg/sqlalchemy/orm/attributes.py,
line 170, in __get__
return self.impl.get(instance_state(instance),dict_)
File
/var/dev/SA/SampleTest/eggs/SQLAlchemy-0.7.1-py2.6-linux-i686.egg/sqlalchemy/orm/attributes.py,
line 439, in get
correctly % key)
KeyError: Deferred loader for attribute 'is_updated' failed to populate
correctly
Please suggest to me fix this error.
Just a thought is this error is raised for following reasons.
1. If table column name length is more than 30 chars.
2. If table has large number of columns defined.
Thanks,
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Re: [sqlalchemy] Deferred loader for attribute for Table having large number of columns.
On Jun 13, 2011, at 10:28 AM, pavi ena wrote: Hello, I am using SQLAlchemy-0.7.1 and i am facing Deferred loader for attribute Error while trying to access the table columns in my code. I have table with huge number of columns around 200 fields and i have defined the schema and entity with hybrid declarative_base approach as below. I have some sample testcases to assert newly inserted values in db with normal python assert statements. When i run my sample test cases i am getting following error: KeyError: Deferred loader for attribute 'is_updated' failed to populate correctly Below is my code example due to large number of columns i have not defined entire db Table definition here. Please suggest to me fix this error. would need a reproducing test case, it suggests something to do with the mechanics of the table but its not clear nor is it an issue seen before. Just a thought is this error is raised for following reasons. 1. If table column name length is more than 30 chars. is_updated doesn't appear to be more than 30 characters to me. Did you create a test that sees if this is the case ? 2. If table has large number of columns defined. Did you create a test with a fewer number of columns in a table to see if this is the case ? -- 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: What is the Sqlalchemy syntax for having ORDER BY and LIMIT on DELETE
What is the syntax for the where id in (select ... ) ? On Jun 13, 5:17 pm, Michael Bayer mike...@zzzcomputing.com wrote: That's a MySQL specific syntax you might be better off not using, perhaps you could say delete from table where id in (select id from table order by timestamp limit 10). To get the exact statement, it's probably easiest just to emit the string SQL. If you wanted the sqlalchemy.sql.delete() construct to do it you'd need to subclass Delete, add order_by() and limit() to it, and augment its compilation as described inhttp://www.sqlalchemy.org/docs/core/compiler.html On Jun 13, 2011, at 10:10 AM, Moshe C. wrote: Hi, I am using Sqlalchemy 0.6.5 . How do I generate the following statement usin Sqlalchemy expressions (not ORM). DELETE FROM table ORDER BY timestamp LIMIT 10; TIA -- 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] how to get model class from CachingQuery
Hello There is a way to get model class from CachingQuery instance? Thanks for help -- 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] Conditional insert in one transaction
Hello. I am trying to create a transaction that should insert a value depending of the result of a select. This should be done at once by the database in order to avoid some conflicts or duplicates. An equivalent sql version of the transaction would be : IF EXISTS (SELECT * FROM Table1 WHERE Column1='SomeValue') INSERT INTO Table1 VALUES (...) Is there a way to do that using sqlalchemy ? Having the if done by python is easy but not safe and i can't find out how to do this using some begin/commit statements. Thanks to help ! -- 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.
