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Null date for Oracle procedure.

Posted on 2001-07-20
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Last Modified: 2010-04-06
Hi.

I'm passing a load of variables to an Oracle 8 stored procedure, but I'm having problems with one of them.

Does anyone know if there are issues with passing a date field a null value from Delphi?  Without going into loads of detail I can't give you much more info.  Unfortunately the code is not mine to give out (even though I wrote it), so I'll just have to rely on your understanding of my explanation.

Thanks,

John.
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Question by:Jaymol
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kretzschmar earned 150 total points
ID: 6301760
storedProc1.ParamByName('DateParam').Clear; //will force a null-value
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by:kretzschmar
ID: 6301772
more specific

...
if MyTDateTimeTypVar = 0 then  //or what condition you have
  storedProc1.ParamByName('DateParam').Clear
else
storedProc1.ParamByName('DateParam').AsDateTime := MyTDateTimeTypVar;  
...

meikl ;-)
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Author Comment

by:Jaymol
ID: 6301801
Meikl,

Just out of curiosity, why are you using ParamByName?  Is it okay to use .Clear with the Values array?

John.
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LVL 6

Author Comment

by:Jaymol
ID: 6301811
Actually, either way doesn't make any difference in this case.  I get the following error message when using the .Clear proc.

    "Variant does not reference an automation object"

o be perfectly honest with you, I could be doing this whole thing wrong as I've never used a TStoredProc before, but I don't think that's the case.

Any more thoughts?

John.
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Author Comment

by:Jaymol
ID: 6301825
That was it!  I just did it wrong.

I did this....


    StoredProc1.Params[3].Value.Clear;

which raise the exception.  If I now do this....

    StoredProc1.Params[3].Clear;

it works fine.  Now I'm just getting an error directly from the Stored Procedure which means that Delphi has passed everything correctly.

I appreciate the help Meikl, but if you've got any advice on using stored procs, or any suggestions as to usual pitfalls etc., I'd be very grateful for your help.

Thanks again,

John.
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LVL 27

Expert Comment

by:kretzschmar
ID: 6301845
well, jaymol,

first, glad that i helped you
and thanks for the points ;-)

and yes just ask if you have
problems with storedprocs,
i've used it a lot

why i use parambyname?
its just a safety issue,
because if the storedproc is changed
on the server by maybe inserted a param before or
reordering the params i will got allways the right parameter, where i have to provide or to get a value

well, if the parameter is renamed then i have also lost :-)

meikl ;-)
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Author Comment

by:Jaymol
ID: 6301857
Makes sense.

Thanks for the advice & help,

John.
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