Re: What's wrong in this pltcl function ?

From: Constantin Teodorescu <teo(at)flex(dot)ro>
To: Constantin Teodorescu <teo(at)flex(dot)ro>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, PostgreSQL Interfaces <pgsql-interfaces(at)postgresql(dot)org>
Subject: Re: What's wrong in this pltcl function ?
Date: 2002-10-14 14:34:47
Message-ID: 3DAAD607.1040009@flex.ro
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Constantin Teodorescu wrote:

> Tom Lane wrote:
>
>> Constantin Teodorescu <teo(at)flex(dot)ro> writes:
>>
>>
>>> 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
>>>
>>
>>
>> I think what is happening is that the select is returning zero rows, and
>> so none of the output variables get set. You should be checking that
>> spi_execp returns a value greater than 0 before trying to use the column
>> variables.
>>
>> As for *why* the select returns zero rows, I think you want the query
>> to read like
>> ... where id=\\$1"
>> As is, it's always looking for the literal id value $1.
>>
>>
>
> I have replaced:
> ... where id=\'\\$1\'
> with
> ... where id=\\$1
>
> and the error is now:
> ERROR: Unable to identify an operator '=$' for types 'character
> varying' and 'integer'
> You will have to retype this query using an explicit cast
>
> when I call the function like that:
>
> select ruldeb('4:0:1:1:2:');
>
> -------------
> I have to say that that account '4:0:1:1:2:' exists in the "conturi"
> table!
> As I said it previously, the query works fine directly (spi_exec)
> without the preparing stuff!
>
> teo

Trying different versions for backspashing I found that the formula that
works is:

... where id=\'\$1\'

So without double backslashing the $ sign (thought I copied that example
from a PostgreSQL documentation)

Thanks,
Teo

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