I don't have any other ideas, I'm afraid. Can you post the relevant section
from the logs?
On Mon, Jul 15, 2019 at 1:51 PM Mirek Morek <testere...@gmail.com> wrote:
> So far I tried to call my function by passing airport_sys_id,
> project_sys_id and column name, leaving value parameter empty as it is
> assigned to None by default.
>
> I see in my logs that it tries to pass in sql query value=None, but it
> doesn't work for numeric type field. It works fine for string type, but for
> numeric one I receive as above: "Implicit conversion from datatype
> 'VARCHAR' to 'NUMERIC' is not allowed. Use the CONVERT function to run
> this query.", so it seems that it treats passed None as string value.
>
> W dniu poniedziałek, 15 lipca 2019 14:24:40 UTC+2 użytkownik Simon King
> napisał:
>>
>> Passing None is the right way to set a column to NULL, so it sounds like
>> you are doing something else wrong. How are you calling your
>> update_airport_reference_temperature function?
>>
>> Also, enabling debug level logging (by passing echo='debug' when you
>> create your SQLAlchemy engine) will show exactly what values you are
>> passing to the database.
>>
>> Simon
>>
>> On Mon, Jul 15, 2019 at 10:45 AM Mirek Morek <teste...@gmail.com> wrote:
>>
>>> Hello Simon,
>>> One extra question:
>>>
>>> Do you know maybe how to assign NULL field value to numeric type field
>>> using sqlalchemy? I change field to some numeric value and then I want to
>>> clear this field.
>>>
>>> I tried assign None as default for value parameter:
>>>
>>> [image: apt2.jpg]
>>>
>>>
>>> But I receive:
>>>
>>> "Implicit conversion from datatype 'VARCHAR' to 'NUMERIC' is not
>>> allowed. Use the CONVERT function to run this query."
>>>
>>> W dniu piątek, 12 lipca 2019 11:53:58 UTC+2 użytkownik Simon King
>>> napisał:
>>>>
>>>> If SQLAlchemy didn't support the second calling style, you would still
>>>> be able to make this work using the Python "**" operator:
>>>>
>>>> updatevalues = {custom_column: value}
>>>> query = AIRPORT.update().values(**updatevalues)
>>>>
>>>> When calling a function, passing "**somedictionary" is equivalent to
>>>> passing each of the dictionary elements as keyword arguments to the
>>>> function.
>>>>
>>>> >>> def f(a, b, c):
>>>> ... print("a =", a)
>>>> ... print("b =", b)
>>>> ... print("c =", c)
>>>> ...
>>>> >>> f(a=1, b=2, c=3)
>>>> a = 1
>>>> b = 2
>>>> c = 3
>>>> >>> args = {'a': 1, 'b': 2, 'c': 3}
>>>> >>> f(**args)
>>>> a = 1
>>>> b = 2
>>>> c = 3
>>>>
>>>> Simon
>>>>
>>>> On Fri, Jul 12, 2019 at 10:28 AM Mirek Morek <teste...@gmail.com>
>>>> wrote:
>>>> >
>>>> > It works!
>>>> >
>>>> > Thank you very much Simon, I really appreciate that. You saved me a
>>>> lot of nerves. I would buy you a beer if I could.
>>>> >
>>>> > So, in general we can say that only second calling style works in my
>>>> example.
>>>> >
>>>> > Regards.
>>>> >
>>>> > W dniu czwartek, 11 lipca 2019 16:35:25 UTC+2 użytkownik Simon King
>>>> napisał:
>>>> >>
>>>> >> Here are the docs for the Update.values() method:
>>>> >>
>>>> >>
>>>> https://docs.sqlalchemy.org/en/13/core/dml.html#sqlalchemy.sql.expression.Update.values
>>>> >>
>>>> >> Note that it supports two main calling styles, either keyword
>>>> arguments:
>>>> >>
>>>> >> .values(name_column='cat')
>>>> >>
>>>> >> ...or passing a dictionary:
>>>> >>
>>>> >> .values({'name_column': 'cat'})
>>>> >>
>>>> >> Since you want to choose the column dynamically, you can use the
>>>> >> dictionary style:
>>>> >>
>>>> >> updatevalues = {custom_column: value}
>>>> >> query = AIRPORT.update().values(updatevalues)
>>>> >>
>>>> >> Hope that helps,
>>>> >>
>>>> >> Simon
>>>> >>
>>>> >> On Thu, Jul 11, 2019 at 3:00 PM Mirek Morek <teste...@gmail.com>
>>>> wrote:
>>>> >> >
>>>> >> > Hello everyone,
>>>> >> > I have a following question:
>>>> >> >
>>>> >> > I use sqlalchemy within my python method as follows:
>>>> >> >
>>>> >> >
>>>> >> > I want to be able to replace 'custom_column' with parameter passed
>>>> in the method. The same way as it works fine for airport_sys_id,
>>>> project_sys_id and value.
>>>> >> >
>>>> >> > For example I want to pass in my method (1, 2, name_column, cat)
>>>> and receive as follows:
>>>> >> >
>>>> >> > query = AIRPORT.update(). \
>>>> >> > where(AIRPORT.c.airport_sys_id == 1). \
>>>> >> > where(AIRPORT.c.project_sys_id == 2). \
>>>> >> > values(name_column=cat)
>>>> >> >
>>>> >> > I searched all I could but with no success. I would be extremely
>>>> thankful for your support. Regards.
>>>> >> >
>>>> >> >
>>>> >> > --
>>>> >> > 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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>>>> >> > To view this discussion on the web visit
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>>>>
>>>> >> > For more options, visit https://groups.google.com/d/optout.
>>>> >
>>>> > --
>>>> > 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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>>> .
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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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--
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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