On Wed, Aug 29, 2012 at 11:37 AM, Gery . <gameji...@hotmail.com> wrote:
>
> Hello,
>
> I'm quite new in SA and I'm having some problems with a script. After
> running the script, I'm getting this error:
>
> [<__main__.Boreholes object at 0xb7a2958c>, <__main__.Boreholes object at
> 0xb7a2962c>, <__main__.Boreholes object at 0xb7a2966c>, <__main__.Boreholes
> object at 0xb7a296cc>, <__main__.Boreholes object at 0xb7a2972c>,
> <__main__.Boreholes object at 0xb7a2978c>, <__main__.Boreholes object at
> 0xb7a297ec>, <__main__.Boreholes object at 0xb7a2984c>, <__main__.Boreholes
> object at 0xb7a298ac>, <__main__.Boreholes object at 0xb7a2990c>,
> <__main__.Boreholes object at 0xb7a2996c>, <__main__.Boreholes object at
> 0xb7a299cc>, <__main__.Boreholes object at 0xb7a29a2c>, <__main__.Boreholes
> object at 0xb7a29a8c>, <__main__.Boreholes object at 0xb7a29aec>,
> <__main__.Boreholes object at 0xb7a29b4c>, <__main__.Boreholes object at
> 0xb7a29bac>, <__main__.Boreholes object at 0xb7a29c2c>, <__main__.Boreholes
> object at 0xb7a29cac>, <__main__.Boreholes object at 0xb7a29d2c>,
> <__main__.Boreholes object at 0xb7a29dac>, <__main__.Boreholes object at
> 0xb7a29e2c>, <__main__.Boreholes object at 0xb7a29eac>, <__main__.Boreholes
> object at 0xb7a29f2c>, <__main__.Boreholes object at 0xb7a29fac>,
> <__main__.Boreholes object at 0xb7a3504c>, <__main__.Boreholes object at
> 0xb7a350cc>, <__main__.Boreholes object at 0xb7a3514c>, <__main__.Boreholes
> object at 0xb7a351cc>, <__main__.Boreholes object at 0xb7a3524c>,
> <__main__.Boreholes object at 0xb7a352cc>, <__main__.Boreholes object at
> 0xb7a3534c>, <__main__.Boreholes object at 0xb7a353cc>, <__main__.Boreholes
> object at 0xb7a3544c>, <__main__.Boreholes object at 0xb7a354cc>,
> <__main__.Boreholes object at 0xb7a3554c>, <__main__.Boreholes object at
> 0xb7a355cc>, <__main__.Boreholes object at 0xb7a3564c>, <__main__.Boreholes
> object at 0xb7a356cc>, <__main__.Boreholes object at 0xb7a3574c>,
> <__main__.Boreholes object at 0xb7a357cc>, <__main__.Boreholes object at
> 0xb7a3584c>, <__main__.Boreholes object at 0xb7a358cc>, <__main__.Boreholes
> object at 0xb7a3594c>, <__main__.Boreholes object at 0xb7a359cc>,
> <__main__.Boreholes object at 0xb7a35a4c>, <__main__.Boreholes object at
> 0xb7a35acc>, <__main__.Boreholes object at 0xb7a35b4c>, <__main__.Boreholes
> object at 0xb7a35bcc>, <__main__.Boreholes object at 0xb7a35c4c>,
> <__main__.Boreholes object at 0xb7a35ccc>]
>
>
> the script is here:
>
> *************************************************************************************************************
>
> # import things to be used
> from sqlalchemy import create_engine, MetaData, Table
> from sqlalchemy.orm import mapper, sessionmaker
>
> # connecting to database engine
> myengine = create_engine('postgresql://postgres:pass@localhost:5432/mop',
> echo=False)
>
> # MetaData: describing the database schema
> mymetadata = MetaData(myengine)
>
> # load existing tables in postgis database
> boreholes = Table('boreholes_point_wgs84', mymetadata, autoload=True)
>
> # defining empty classes to be mapped to existing tables
> class Boreholes(object):
> pass
>
> # mapping empty classes to existing tables [ie. ORM]
> Boreholesmapper = mapper(Boreholes, boreholes)
>
> # session operations [finding data, adding data, modifying data and deleting
> data]
> Session = sessionmaker(bind=myengine)
> mysession = Session()
>
> # queries
> alldata = mysession.query(Boreholes).all()
> print alldata
>
> *************************************************************************************************************
>
> I'm working with python2.4 and SA 0.7.8 in rhel5 (32-bit).
>
> Any hint is appreciated,
>
> Best regards,
>
> Gery
>
That's not an error - that is a list of instances of the Borehole
class, which is what you get back from Query.all().
The columns in your boreholes_point_wgs84 become properties of those
instances. So for example if the table has "name", "latitude" and
"longitude" columns, you would be able to change your last 2 lines to
say something like:
for borehole in mysession.query(Boreholes).all():
print borehole.name, borehole.latitude, borehole.longitude
Hope that helps,
Simon
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