Alright, thank you very much! Very informative.
On Monday, January 20, 2020 at 10:29:10 PM UTC+3, Mike Bayer wrote:
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> On Mon, Jan 20, 2020, at 2:26 PM, Mike Bayer wrote:
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> On Mon, Jan 20, 2020, at 1:46 PM, Andrei Pashkin wrote:
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> Hello!
>
> I wonder - is it possible to parametrize where expression as a whole like
> that:
> select([users_table]).where(bindparam('criteria'))
>
>
> nope, that's not how SQL bound parameters work.
>
>
> ?
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> My use case is that I'd like to pre-compile a complex SQLAlchemy
> expression to avoid redundant computations and achieve the same effect as
> Bakery has for the ORM but only for a low-level SA expression.
>
>
> Wait for SQLAlchemy 1.4, this will have that feature.
>
>
> noting also, there is a cache feature for Core statements right now, you
> just have to use the same statement object each time, since currently the
> statement object itself is the cache key. See
> https://docs.sqlalchemy.org/en/13/core/connections.html?highlight=compiled_cache#sqlalchemy.engine.Connection.execution_options.params.compiled_cache
>
> . This is what BakedQuery ultimately uses also and the unit of work uses
> it also.
>
> In 1.4 all statements will be able to generate a separate cache key that
> is repeatable for multiple instances of the same statement.
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> --
> SQLAlchemy -
> The Python SQL Toolkit and Object Relational Mapper
>
> http://www.sqlalchemy.org/
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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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