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Re: Best way to construct Datum out of a string?

From: Yves Weißig <weissig(at)rbg(dot)informatik(dot)tu-darmstadt(dot)de>
To: pgsql-hackers(at)postgresql(dot)org
Subject: Re: Best way to construct Datum out of a string?
Date: 2011-04-27 20:35:16
Message-ID: 4DB87E04.3020004@rbg.informatik.tu-darmstadt.de (view raw or flat)
Thread:
Lists: pgsql-hackers
Am 27.04.2011 16:11, schrieb Heikki Linnakangas:
> On 27.04.2011 17:06, Yves Weißig wrote:
>> Hi,
>>
>> sadly, so far my search in the source code wasn't very successfull on
>> this topic.
>> So, how can I construct a Datum out of a string?
> 
> What kind of a Datum do you want it to be? What data type? See
> CStringGetDatum, or perhaps CStringGetTextDatum(). Or perhaps you want
> to call the input function of some other datatype, with InputFunctionCall.
> 

Ok, but how do I do that?

Currently I am using:

_ebi_mtab_insert(rel, CStringGetTextDatum(BVEC_NULL), bin_enc);

This function does not mere than hashing the 2nd passed argument (with
the internal hash functions of hash.c) but each time a different hash
value is returned, so I am thinking I might pass a pointer and not the
real Datum. I am highly irritated now... as for now I thought I
understood Datum...

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