Re: Procedure parameter list enumeration error

Hi Kamil,

Not sure about the domain types and the Boolean, but for the sizes,
PostgreSQL does not store string lengths on procedure parameters. If you
provide them when creating the procedure they are discarded without error
(see the Notes section of
https://www.postgresql.org/docs/current/sql-createfunction.html) The
procedure will accept strings of any length.

Adrian Grucza
Technical Lead
Tel: +61390185800
adrian(dot)grucza(at)iress(dot)com
www.iress.com
Level 16 385 Bourke St
Melbourne, Victoria, 3000
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nosig

On Fri, 1 Oct 2021 at 21:45, Kamil ADEM <kamila(at)aqvilasoftware(dot)com> wrote:

>
>
> *CAUTION: *This Email is from an EXTERNAL source. Ensure you trust this
> sender before clicking on any links or attachments.
>
>
> Hello,
>
>
>
> We use psqlODBC to access Postgres in our MFC C source on Windows. While
> enumerating procedure parameters we observe some errors we would like to be
> solved.
>
>
>
> We have a procedure declared as:
>
> public.SP_TEST(INOUT return_value INTEGER, INOUT p1_varchar1024
> ACIKLAMA1024, INOUT p2_char20 KOD, INOUT p3_int TAMSAYI, INOUT p4_smallint
> YIL, INOUT p5_bit BOOL, INOUT p6_float MEBLAG, INOUT p7_datetime TARIH)
>
> The parameter types are user created domains.
>
> We have the following C source using Microsoft ADODB :
>
> _CommandPtr pCommand;
>
> pCommand->CommandType = adCmdStoredProc;
>
> pCommand->CommandText = _bstr_t("SP_TEST");
>
> Next, we enumerate the array pCommand->Parameters using
> pCommand->Parameters->Item[_variant_t(i)] and get the following output:
>
> Name=return_value, Type=3, Direction=3, Size=0
>
> Name=p1_varchar1024, Type=200, Direction=3, Size=255
>
> Name=p2_char20, Type=200, Direction=3, Size=255
>
> Name=p3_int, Type=200, Direction=3, Size=255
>
> Name=p4_smallint, Type=200, Direction=3, Size=255
>
> Name=p5_bit, Type=200, Direction=3, Size=5
>
> Name=p6_float, Type=200, Direction=3, Size=255
>
> Name=p7_datetime, Type=200, Direction=3, Size=255
>
>
>
> *The problem is that the types and sizes of the user created domains are
> not reported correctly!*
>
>
>
> When we change the procedure to the following, replacing the domains with
> underlying data types:
>
> public.SP_TEST(INOUT return_value INTEGER, INOUT p1_varchar1024
> VARCHAR(1024), INOUT p2_char20 CHAR(20), INOUT p3_int INT, INOUT
> p4_smallint SMALLINT, INOUT p5_bit BOOLEAN, INOUT p6_float FLOAT, INOUT
> p7_datetime TIMESTAMP)
>
> we get the following enumeration result:
>
> Name=return_value, Type=3, Direction=3, Size=0
>
> Name=p1_varchar1024, Type=200, Direction=3, Size=255
>
> Name=p2_char20, Type=200, Direction=3, Size=255
>
> Name=p3_int, Type=3, Direction=3, Size=0
>
> Name=p4_smallint, Type=2, Direction=3, Size=0
>
> Name=p5_bit, Type=200, Direction=3, Size=5
>
> Name=p6_float, Type=5, Direction=3, Size=0
>
> Name=p7_datetime, Type=135, Direction=3, Size=0
>
>
>
> *This time the types are reported correctly (with the exception of
> boolean), but the size field for character types are still incorrect!*
>
>
>
> We use the following connection string:
>
> "Driver={PostgreSQL
> ANSI};Server=localhost;Port=5432;Database=…;Uid=postgres;Pwd=…"
>
> On the ODBC DSN configuration, the following changes have been made:
>
> “Bools as Char” is unchecked
>
> “Max VarChar” = 1036
>
>
>
> We have a generic interface for calling stored procedures in our code
> being migrated from MSSQL to PostgreSQL. So we need to enumerate the
> parameters before calling the procedure to generate the parameter list.
>
>
>
> How can we get rid of these issues? How can you help us to solve these
> problems?
>
>
>
> Thanks in advance.
>
>
>
> Kamil Adem
>
> Aqvila Software Yazılım A.Ş.
>
>
>
>
>