Ok, I'l try it, thank you.
вторник, 11 апреля 2017 г., 17:26:18 UTC+3 пользователь Mike Bayer написал:
>
> I will say that the psycopg2 driver is not supporting this, however, it
> isn't parsing out the tuple. Using postgresql.ARRAY we get an answer
> like:
>
> ['{', '"', '(', 'x', ',', 'y', ')', '"', ',', '"', '(', 'x', ',', 'y',
> ')', '"', '}']
>
> that is, the string coming back is being interpreted as an array by
> SQLAlchemy, which here it is not. you might need to use some of the
> psycopg2 extension points to support this like
>
> http://initd.org/psycopg/docs/extensions.html#psycopg2.extensions.new_array_type.
>
>
>
>
>
> On 04/11/2017 09:43 AM, mike bayer wrote:
> > can't reproduce (though the ARRAY(unicode) type is not what psycopg2
> > returns, and there seems to be a difference in behavior between
> > sqlalchemy.ARRAY and sqlalchemy.dialects.postgresql.ARRAY).
> >
> > please provide a complete example based on the below test script and
> > stack traces
> >
> > also my PG database doesn't know about the jsonb_object_agg function
> >
> > from sqlalchemy import *
> > from sqlalchemy.orm import *
> > from sqlalchemy.ext.declarative import declarative_base
> >
> > Base = declarative_base()
> >
> >
> > class A(Base):
> > __tablename__ = 'a'
> > id = Column(Integer, primary_key=True)
> > x = Column(Unicode)
> > y = Column(Unicode)
> >
> > e = create_engine("postgresql://scott:tiger@localhost/test", echo=True)
> > Base.metadata.drop_all(e)
> > Base.metadata.create_all(e)
> >
> > s = Session(e)
> > s.add(A(x="x", y="y"))
> > s.commit()
> >
> > row = s.query(func.array_agg(tuple_(A.x, A.y),
> > type_=ARRAY(Unicode))).scalar()
> > print row
> >
> >
> >
> >
> >
> > On 04/11/2017 09:04 AM, Антонио Антуан wrote:
> >> Hi
> >> I want to build such query with sqlalchemy:
> >> |
> >> SELECT array_agg((column1,column2))fromtable
> >> |
> >>
> >> Using psql it works perfectly and returns such result:
> >> |
> >> {"(col1_row1_value, col2_row1_value)","(col1_row2_value,
> >> col2_row2_value)"...}
> >> |
> >>
> >> I tried several forms of SQLA-query:
> >>
> >> |>> from sqlalchemy.dialects.postgresql import ARRAY
> >>>> from sqlalchemy.sql.elements import Tuple
> >>>> ...
> >>>> func.array_agg(Tuple(Model.col1,Model.col2),type_=ARRAY(Unicode))...
> >> ...
> >> TypeError: unhashable type: 'list'
> >>>> ... func.array_agg(Tuple(Model.col1, Model.col2),
> type_=ARRAY(Unicode,
> >> as_tuple=True))...
> >> ...# returns value like this: ('{', '"', '(', 'c',...)
> >>>> ... func.array_agg(Tuple(Model.col1, Model.col2), type_=ARRAY(Tuple,
> >> as_tuple=True))...
> >> ...
> >> AttributeError: Neither 'Tuple' object nor 'Comparator' object has an
> >> attribute 'dialect_impl'
> >> |
> >>
> >> At first, I wanted to use /`func.jsonb_object_agg(Model.col1,
> >> Model.col2)`/, but it raises */"unhashable type: dict"/*
> >> */
> >> /*
> >> Could you point to solution?
> >>
> >> --
> >> SQLAlchemy -
> >> The Python SQL Toolkit and Object Relational Mapper
> >>
> >> http://www.sqlalchemy.org/
> >>
> >> To post example code, please provide an MCVE: Minimal, Complete, and
> >> Verifiable Example. See http://stackoverflow.com/help/mcve for a full
> >> description.
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--
SQLAlchemy -
The Python SQL Toolkit and Object Relational Mapper
http://www.sqlalchemy.org/
To post example code, please provide an MCVE: Minimal, Complete, and Verifiable
Example. See http://stackoverflow.com/help/mcve for a full description.
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