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Re: Output parameters

From: Hiroshi Inoue <inoue(at)tpf(dot)co(dot)jp>
To: Bart Samwel <bart(at)samwel(dot)tk>
Cc: pgsql-odbc(at)postgresql(dot)org
Subject: Re: Output parameters
Date: 2006-05-17 23:32:47
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-odbc
Bart Samwel wrote:
> Hiroshi Inoue wrote:
>> Bart Samwel wrote:
>>> Hiroshi Inoue wrote:
>>>> Bart Samwel wrote:
>>>>> Hi there,
>>>>> I've got a situation with the experimental enhanced branch driver 
>>>>> (version, PostgreSQL 8.1 backend. I'm executing a query 
>>>>> such as:
>>>>> SELECT myproc(?,?,?,?,?,?,?)
>>>>> where a number of the parameters are output parameters. I've bound 
>>>>> buffers to the output parameters, but when I read the values, they 
>>>>> contain garbage (uninitialized data, to be precise -- 0xcdcdcdcd). 
>>>> What kind of tool are you using and how do you execute the above 
>>>> example concretely ?
>>> I'm using our own ODBC front end library, freshly written from spec. 
>>> The same code works like a charm on Oracle to retrieve output 
>>> parameters. I could figure out the exact sequence of calls if you 
>>> want, there's quite a lot of wrapper code around it but It'd probably 
>>> be possible.
>> Could you send me the Mylog output ?
> Yes, it's attached. Please read on for some extra context information. :-)
> Anyway, it turns out that I misinterpreted the way PostgreSQL implements 
> output parameters -- apparently, they are nothing but a convenient way 
> to make PostgreSQL create a complex return type for a function. In 
> PL/pgSQL, however, I can't specify the output parameters in the 
> parameter list, while with the ODBC driver I can.

Please use ODBC's standard syntax to execute functions or procedures.

	{[?=]call procedure-name[([?][,[?]]...)]}

For example, please execute {CALL baz(?, ?)} in your case.

Hiroshi Inoue

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