Yes, when passing integer value as value everything is fine, so only value
parameter is a concern here. This is Sybase database so maybe that is a
case.
W dniu poniedziałek, 15 lipca 2019 16:52:27 UTC+2 użytkownik Simon King
napisał:
>
> Hmm, the None looks fine, but now I'm suspicious of those airport_sys_id
> and project_sys_id values. Why are they being passed as floating point
> values, rather than integers?
>
> Does the same query work if the reference_temperature is not None?
>
> On Mon, Jul 15, 2019 at 3:32 PM Mirek Morek <teste...@gmail.com
> <javascript:>> wrote:
>
>>
>> Sure[image: log.jpg]
>>
>>
>> W dniu poniedziałek, 15 lipca 2019 15:28:54 UTC+2 użytkownik Simon King
>> napisał:
>>>
>>> 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 <teste...@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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>>>>>>>
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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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>>>>>>>
>>>>>>>
>>>>>>> > 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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>>>>>> To view this discussion on the web visit
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>>>>>>
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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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>>>>
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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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