From: Kumar <sgnerd@yahoo.com.sg>
To: Tomasz Myrta <jasiek@klaster.net>
Cc: psql <pgsql-sql@postgresql.org>
Subject: Re: How to avoid nulls while writing string for dynamic query
Date: Fri, 13 Feb 2004 12:43:26 +0530
Message-ID: <00c801c3f200$e117eff0$7502a8c0@hdsc.com> (raw)
References: <00c001c3f164$1db30140$7502a8c0@hdsc.com>
<402B74F4.7070604@klaster.net>
<006701c3f1ed$6610dc30$7502a8c0@hdsc.com>
<402C6FB8.8000606@klaster.net>
oh, ok understood.
What will happen for a timestamp field. Let us say c1 is a timestamp column.
sqlstr := 'insert into test(c1, c2) values
('||'\''||COALESCE(rec.c1,'NULL')||'\','
> > ||'\''||rec.c2||'\')';
If this case the query will be
insert into test(c1,c2) values ('2004-02-13', 'Hai')
If there is a null value encountered i will return an error for the
following query
insert into test(c1,c2) values ('NULL', 'Hai')
ERROR: Bad timestamp external representation 'NULL'
I think using 'CASE' this could be solved. But instead is there any other
simple way to do it.
Thanks a lot Mr. Tomasz Myrta
Kumar
----- Original Message -----
From: "Tomasz Myrta" <jasiek@klaster.net>
To: "Kumar" <sgnerd@yahoo.com.sg>
Cc: "psql" <pgsql-sql@postgresql.org>
Sent: Friday, February 13, 2004 12:03 PM
Subject: Re: [SQL] How to avoid nulls while writing string for dynamic query
> Dnia 2004-02-13 05:53, Użytkownik Kumar napisał:
>
> > I am having problem there. see what happens
> >
> > sqlstr := 'insert into test(c1, c2) values
('||COALESCE(rec.c1,'NULL')||','
> > ||'\''||rec.c2||'\')';
>
> You are preparing a string, so make sure you have strings everywhere:
> sqlstr := 'insert into test(c1, c2) values
> ('||COALESCE(rec.c1::text,'NULL')||','||'\''||rec.c2||'\')';
>
> Regards,
> Tomasz Myrta
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