Thanks for the suggestion.
I thought about using an alias but came up with two problems:
1) The FROM clause is auto-generated from SELECT clause, so I'm not sure
where I would add this alias
2) All the aliases in the SELECT clause are also double-quoted. I believe a
single backquote would be more standard here. Perhaps there is a general
use on double quotes in SQL generation when backquotes would be more
appropriate?
In my case, I can solve this by making sure that schema names always start
with a letter. This will prevent similar situations lurking elsewhere in my
code. But, I'll have to be careful that I don't mess up any code that deals
with previously-created schemas. Shouldn't be much of an issue today,
however.
On Friday, May 12, 2023 at 4:38:23 PM UTC-4 S Mahabl wrote:
> Is there alias you can give for
>
> *283ac7717fe770c5ed6d425c0c739cba".t_59a33cbea3617986d810e9fbae60ba19 XYZ*
>
> *?*
>
> On Fri, May 12, 2023, 3:30 PM Benjamin Taub <benjam...@dataspace.com>
> wrote:
>
>> I have code that worked under SQLAlchemy 1.4 but recently upgraded to 2.
>> I am using the add_columns() method to add columns to an existing SQL
>> statement. The resultant queries sometimes, but not always, crash. I
>> believe the issue happens when the schema/database name (I'm using MySQL)
>> starts with a number. When the schema name starts with a letter, the result
>> runs fine. However, when it starts with a number, the query double-quotes
>> the schema name, causing the query to crash.
>>
>> Here is an example...
>> My code: *sql = sql.add_columns(self.tbl.c[field])*
>>
>> When the schema holding self.tbl.c[field] starts with a letter
>> (c6961a19b7ed031ce902f056c725b3e3), the following SQL is generated:
>>
>>
>> *SELECT NULL AS "Application Id", NULL AS "First Name", NULL AS "Last
>> Name", NULL AS "Email",
>> c6961a19b7ed031ce902f056c725b3e3.t_31392eb2e6980f4d5082b7861182f2b4.master_key
>>
>> FROM c6961a19b7ed031ce902f056c725b3e3.t_31392eb2e6980f4d5082b7861182f2b4*
>>
>> However, when the schema name starts with a number
>> (283ac7717fe770c5ed6d425c0c739cba), the following SQL results:
>>
>> *SELECT NULL AS "Application Id", NULL AS "First Name", NULL AS "Last
>> Name", NULL AS "Email",
>> "283ac7717fe770c5ed6d425c0c739cba".t_59a33cbea3617986d810e9fbae60ba19.master_key
>>
>> FROM "283ac7717fe770c5ed6d425c0c739cba".t_59a33cbea3617986d810e9fbae60ba19*
>>
>> Note the double quotes around the schema name. This second SQL crashes as
>> invalid. Back quotes (`) would probably work fine in this situation, and
>> could be helpful, but double quotes (") are, I think, the cause of my
>> problem.
>>
>> Is there some parameter or assumption that I'm not understanding, or did
>> I find a bug?
>>
>> Thank you!
>> Ben
>>
>>
>> --
>> 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
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