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Date: Tue, 29 Apr 2014 19:25:51 -0600
Subject: Re: pyodbc connect string
From: Larry Martell <larry.martell@gmail.com>
To: Ben Finney <ben@benfinney.id.au>
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On Tue, Apr 29, 2014 at 7:14 PM, Ben Finney <ben@benfinney.id.au> wrote:
> Larry Martell <larry.martell@gmail.com> writes:
>
>> I am having a problem building a connect string for pyodbc. It works
>> when everything is hard coded, but if I build the connect string it
>> fails.
>>
>> This works:
>>
>> pyodbc.connect('DRIVER=3DFreeTDS;' 'SERVER=3Dxx.xx.xx.xx;' 'PORT=3D1433;=
'
>> 'DATABASE=3Dblah;' 'UID=3Dfoo;' 'PWD=3Dbar;')
>
> This calls the function with a single string,
> "DRIVER=3DFreeTDS;SERVER=3Dxx.xx.xx.xx;PORT=3D1433;DATABASE=3Dblah;UID=3D=
foo;PWD=3Dbar;".
>
> Remember that consecutive, whitespace-separated, quote-delimited
> fragments specify the construction of a single string literal::
>
>     >>> 'foo'
>     'foo'
>     >>> 'foo' 'bar'
>     'foobar'
>     >>> 'foo' 'bar' 'baz'
>     'foobarbaz'
>
> See the reference for how this concatenation occurs
> <URL:https://docs.python.org/3/reference/lexical_analysis.html#string-lit=
eral-concatenation>.
>
>> But this does not:
>>
>> pyodbc.connect(conn_str)
>>
>> Where conn_str is:
>>
>> 'DRIVER=3DFreeTDS;' 'SERVER=3Dxx.xx.xx.xx;' 'PORT=3D1433;' 'DATABASE=3Db=
lah;'
>> 'UID=3Dfoo;' 'PWD=3Dbar;'
>
> This string is different, because it contains a whole lot of quotation
> marks and whitespace not in the string you show in the first example.
>
>> conn_str is constructed with:
>>
>>  conn_str =3D "'DRIVER=3D%s;' 'SERVER=3D%s;' 'PORT=3D%s;' 'DATABASE=3D%s=
;'
>> 'UID=3D%s;' 'PWD=3D%s;'" \
>>                 % (RECIPE_DB['DRIVER'], RECIPE_DB['SERVER'],
>> RECIPE_DB['PORT'], RECIPE_DB['DATABASE'],
>>                    RECIPE_DB['USER'], RECIPE_DB['PASSWORD'])
>
> Remove the extraneous quotes and whitespace, which were not in the
> original string you showed above.
>
> On a separate point: Since you have string keys for the mapping, you can
> make the interpolation more readable::
>
>     conn_str =3D (
>             "DRIVER=3D%(DRIVER)s;SERVER=3D%(SERVER)s;PORT=3D%(PORT)s;"
>             "DATABASE=3D%(DATABASE)s;UID=3D%(USER)s;PWD=3D%(PASSWORD)s;"
>             ) % RECIPE_DB
>
> since the named placeholders will be looked up by key in the =E2=80=98REC=
IPE_DB=E2=80=99
> mapping.
>
> There are other improvements to suggest, but I don't want to distract
> from the main point of the post.

Thanks for the explanation.