RE: Problem on calling procedures with ADODB

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From: Kamil ADEM <[email protected]>
To: Adrian Grucza <[email protected]>
Cc: [email protected] <[email protected]>
Subject: RE: Problem on calling procedures with ADODB
Date: Thu, 16 Sep 2021 13:23:23 +0000
Message-ID: <[email protected]> (raw)
In-Reply-To: <CADF4wWpFgFNyB=XxrVDKo=cG2n5N3p3pxo-XqwQTeToGSEUeZQ@mail.gmail.com>
References: <[email protected]>
	<CADF4wWpFgFNyB=XxrVDKo=cG2n5N3p3pxo-XqwQTeToGSEUeZQ@mail.gmail.com>

Hi Adrian,

Thank you very much for your support.

Yes, I tried setting CommandText as you propose and succeeded to call the procedure. But I got another minor problem this time. I hope you have a solution for this too. 😊
To be more clear, here are the source codes:
Postgres procedure:
CREATE OR REPLACE PROCEDURE public.SP_TEST(INOUT VALUE_INOUT INTEGER, IN USERNAME VARCHAR(50))
LANGUAGE plpgsql
   AS $$
BEGIN
                insert into tohal_kullanici (satis_faturasi_sira_no, ad) values (VALUE_INOUT, USERNAME);
                VALUE_INOUT := 20;
                RETURN;
END; $$;
MFC code:
_CommandPtr pCommand;
pCommand->CommandType = adCmdText;
pCommand->CommandText = _bstr_t("CALL SP_TEST(?, ?)");
pCommand->Parameters->Append(pCommand->CreateParameter(_bstr_t("$1"), adInteger, adParamInputOutput, 0));
pCommand->Parameters->Append(pCommand->CreateParameter(_bstr_t("$2"), adVarChar, adParamInput, 255));
pCommand->Parameters->Item[_variant_t((long)1)]->Value = _variant_t(CString("Test10"));
pCommand->Parameters->Item[_variant_t((long)0)]->Value = _variant_t((long)10);
pCommand->Execute(NULL, NULL, adCmdText);

The procedure is called and the parameter values are passed correctly to the procedure. But the first parameter value is not returned to the C code, the value set before Execute() remains unchanged.
Do you have any idea about the reason of this case?

Thanks in advance.

Kamil Adem

From: Adrian Grucza <[email protected]>
Sent: Thursday, September 16, 2021 2:07 PM
To: Kamil ADEM <[email protected]>
Cc: [email protected]
Subject: Re: Problem on calling procedures with ADODB

Hi Kamil,

Have you tried changing pCommand->CommandText to _bstr_t("CALL sp_TEST(?, ?, ?)"), with one question mark per parameter?

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On Thu, 16 Sept 2021 at 17:49, Kamil ADEM <[email protected]<mailto:[email protected]>> wrote:

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Hello,

We porting a Windows MFC application from MSSQLServer to PostgreSQL and trying to use psqlODBC driver with Microsoft ADODB.
We are currently performing the migration steps of our C sources and got stuck on an issue and thought to ask for your help.

We use Microsoft ADODB on Windows to access the database and cannot change this interface in short time. To access Postgres we changed the connection string accordingly. (e.g. “Driver= {PostgreSQL ANSI};”)
On calling Postgres procedures we have the following code sample:
_CommandPtr pCommand;
pCommand->CommandType = adCmdStoredProc;
pCommand->CommandText = _bstr_t(“sp_TEST”);
pCommand->Parameters->Refresh();
pCommand->Execute(NULL, NULL, adCmdStoredProc | adExecuteNoRecords);
The Execute() method generates the command: “SELECT * FROM sp_TEST(…)” instead of “CALL sp_TEST(…)”. This is appropriate for Postgres functions, but there must be a way to call procedures also.
Do you know such a reported issue?  Do you know a way to change this behaviour? Should we use a different driver? Should we get rid of procedures and convert our MSSQL stored procedures to Postgres functions?

We would be grateful if you can guide us to the right solution.
Thanks in advance.

Best regards,

Kamil Adem
Aqvila Software Yazılım A.Ş.

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