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From: omeuid (@omeuid) <[email protected]>
To: postgresql-interfaces/psqlodbc <[email protected]>
Subject: [postgresql-interfaces/psqlodbc] issue #117: How to use PostgreSQL extended protocol with ODBC driver executing a parameterized sentence.
Date: Wed, 21 May 2025 14:56:44 +0000
Message-ID: <[email protected]> (raw)

Hi,

Is there a way to configure the ODBC driver to use the extended protocol when running a parameterized query?

Let's assume the following Python client.

> import pyodbc
> 
> def connect_to_odbc(uri):
>     conn = pyodbc.connect(uri)
>     return conn
> 
> def execute_query(conn, query):
>     cursor = conn.cursor()
>     cursor.execute(query, 1)
>     result = cursor.fetchall()
>     return result
>    
> uri = 'DSN=MyDSN'
> 
> conn = connect_to_odbc(uri)
> query = 'SELECT * from mytable where id = ?'
> 
> result = execute_query(conn, query)
> 
> for row in result:
>     print(row)
> 
> conn.close()

If the DSN is configured with 'server side prepare' option set to 1 (and also batch size is set to 1):

* I expected that the driver would send P/B/E messages.
* However, what I'm observing is that the driver only sends a Q message, with the parameter already replaced.

Could you confirm if this is the expected behaviour? 

Is there anything that I can configure in the driver in order to get the behaviour that I was expecting?

Regards

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  To: github://postgresql-interfaces/psqlodbc
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  Subject: Re: [postgresql-interfaces/psqlodbc] issue #117: How to use PostgreSQL extended protocol with ODBC driver executing a parameterized sentence.
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