Thanks! it worked :)
Medhavi Mahansaria
Tata Consultancy Services Limited
Unit-VI, No.78, 79& 83,
L-Centre, EPIP Industrial Estate,
Whitefield
Bangalore - 560066,Karnataka
India
Ph:- +91 80 67253769
Cell:- +91 9620053040
Mailto: medhavi.mahansaria@xxxxxxx
Website: http://www.tcs.com
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From: Kevin Grittner <kgrittn@xxxxxxxxx>
To: Medhavi Mahansaria <medhavi.mahansaria@xxxxxxx>, Bill Moran <wmoran@xxxxxxxxxxxxxxxxx>
Cc: "pgsql-general@xxxxxxxxxxxxxx" <pgsql-general@xxxxxxxxxxxxxx>
Date: 03/06/2015 07:32 PM
Subject: Re: #PERSONAL# Reg: date going as 01/01/0001
Medhavi Mahansaria <medhavi.mahansaria@xxxxxxx> wrote:
> Now my problem is that my bind variables are of string type and
> when the get a NULL value is converts it into an empty string in
> C++ programming.
> Example:
> insert into check_date values
> (to_date(:h1,'yyyymmddhh24miss'),
> 1,
> to_date(:h2,'yyyymmddhh24miss'));
>
> now h1 and h2 are of string datatype in my c++ program.
>
> If no value is there, it is passed on as a empty string into my
> query.
>
> How can I handle this to enter NULL values?
Well, arguably the best solution is to use a tool chain that
doesn't conflate any particular "magic value" with NULL. Where
that can't be done, you might want to look at the SQL standard's
NULLIF() construct.
insert into check_date values
(to_date(nullif(:h1, ''),'yyyymmddhh24miss'),
1,
to_date(nullif(:h2, ''),'yyyymmddhh24miss'));
If the two arguments to nullif() are equal, it returns NULL;
otherwise it returns the first argument.
--
Kevin Grittner
EDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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