What you have written below seems correct to me. If you're thinking of
modifying source files to add the capability to the tcl interface, this
is what I think:
* You won't need to modify anything other than the "tclsqlite.c" file.
Don't add a pragma. Instead add a tcl command to set the "null
On Wed, 2005-03-23 at 20:49 +0100, Stefan Finzel wrote:
> Although Tcl does not know NULL at all, sqlite does.
Correct. The TCL bindings map NULLs into an empty string.
--
D. Richard Hipp <[EMAIL PROTECTED]>
Although Tcl does not know NULL at all, sqlite does. From my current
unterstanding there are five different fundamental internal datatypes.
One of them is SQLITE_NULL. But SQLITE_NULL is not used at all while
iterating over the results of
dbcmd eval "SELECT ..."
From my current unterstanding
> Yeah! I've missed the default option. But is this SQL standard?
Yes.
> sqlite> insert into deftest (i, s) values (NULL,'');
This inserts NULL (not a string) into i and '' into s.
When you retrieve that row using tcl, both are represented
by empty strings.
Default values replace missing
Stefan Finzel wrote:
Within sqlite console there is a a command
.nullvalue NULL
All I want is to know how I can set and use this mechanismen from my
Tcl interpreter too.
The shell can do this because it is implemented in C, which can
distinguish between the NULL and empty string return values
Hello Jay,
Yes, that is the expected behaviour. But that is not my problem.
Within sqlite console there is a a command
.nullvalue NULL
All I want is to know how I can set and use this mechanismen from my Tcl
interpreter too.
Of cause it would be possible to misuse the default setting to get the
--- Stefan Finzel <[EMAIL PROTECTED]> wrote:
> Yeah! I've missed the default option. But is this SQL standard?
>
> And it does not seem to work for me at all. I still can't differ
> empty and NULL;
> create table deftest (k integer primary key,
> i integer default
Yeah! I've missed the default option. But is this SQL standard?
And it does not seem to work for me at all. I still can't differ empty
and NULL;
create table deftest (k integer primary key,
i integer default 'NULL',
s char default 'NULL');
sqlite> insert
> Is there a way to change the NULL representation ... ?
No. Tcl has no null value. Usually this is not a problem,
but if you really need to distinguish between a missing
value and an empty string, you can use default values.
sqlite> create table deftest (k integer primary key,
...>
Hi,
maybe this is also a too simple question but I miss it "once again? ;-) "
I am using tclsqlite 2.8.16/3.1.x/3.2.0 to query for results containing
NULL and/or empty integer/float/text/blob.
Is there a way to change the NULL representation to get a specified
string (NULL, NAN) for NULL values
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