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Re: What's wrong in this pltcl function?

From: Constantin Teodorescu <teo(at)flex(dot)ro>
To: PostgreSQL Interfaces <pgsql-interfaces(at)postgresql(dot)org>
Subject: Re: What's wrong in this pltcl function?
Date: 2002-10-14 14:19:29
Message-ID: 3DAAD271.5070702@flex.ro (view raw or flat)
Thread:
Lists: pgsql-interfaces
Nigel J. Andrews wrote:

> On Mon, 14 Oct 2002, Constantin Teodorescu wrote:
>
>  
>
>> create function ruldeb(bpchar) returns bpchar as '
>>    set cont $1
>>    set rulaj 0.0
>>    spi_exec -array rec "select valoare from valori where debitor LIKE 
>> \'$cont%\'" {
>>        set rulaj [expr {$rulaj + $rec(valoare)}]
>>    }
>>    if {![info exists GD(conturi_lookup)]} {
>>        set GD(conturi_lookup) [spi_prepare "select cheie,denumire 
>> from conturi where id=\'\\$1\'" [list bpchar]]
>>    }
>>    spi_execp -count 1 $GD(conturi_lookup) [list $cont]
>>    return "{$cheie} {$denumire} $rulaj"
>> ' LANGUAGE 'pltcl';
>>
>>
>> is giving the following error:
>>
>> ERROR:  pltcl: can't read "cheie": no such variable
>> can't read "cheie": no such variable
>>    while executing
>> "return "{$cheie} {$denumire} $rulaj""
>>    (procedure "__PLTcl_proc_1759991" line 12)
>>    invoked from within
>> "__PLTcl_proc_1759991 4:0:1:1:2:"
>>   
>
>
>
> Looks like your prepared query is not finding any matching tuples.
>
> If a query returns 0 tuples then all column variables will be undefined.
> Undefined because if you set them before then they will not be unset. 
> This
> differs from the case where a tuple has been returned by the query but a
> column's value is NULL. In this case the TCL variable is unset.
>
>
>  
>

I just imagined that but the question is why!
Because the spi_exec on the original query without preparing anything 
works just fine!

I mean:
spi_exec "select cheie,denumire from conturi where id=\'$cont\'"

seems that there is some problem at specifying the parameter list (or 
backsplashing the $ sign)

teo





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Subject: Re: What's wrong in this pltcl function ?
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