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Seems
you don't - but am sure that at one stage I did just that, create a parameter,
add it to the query object, set it parameters and it worked. If you trace
through your code and check the paramcount before and after prepare and its zero
then the parameter isn't being created behind the scenes and you need to use
something (delphi not in front of me now) like this:
Params.AddParam(Params.Createparam(
whatever, whatever, whatever)). But Neven seems to know what he's
saying.
I
agree with keeping Date/Time info as that and not using strings.
-----Original Message-----
From:
Mark Howard [mailto:[EMAIL PROTECTED]]
Sent: 30 May 2001
16:48
To: Multiple recipients of list delphi
Subject: Re:
[DUG]: SQL and Parameters
You were right.
I had no idea that I had to specifically add parameter
objects to the TQuery. I can't find any mention of this in any of my 4
Delphi books.
My procedure is now as follows, but I still
get "Could not find object". Is the code that I have used to
add the parameter correct?
procedure RunPQuery(SQLFile: string);
begin
with RSQuery do
begin
Close;
Unprepare;
SQL.LoadFromFile(HomeDir +
'\SQLFiles\' + SQLFile + '.SQL');
Params.CreateParam(ftDate, 'SaveDate',
ptOutput);
ParamByName('SaveDate').AsDate :=
CurrentDate;
Prepare;
ExecSQL;
MainForm.Memo.Lines.Add('Done');
end;
end;
Tomorrow, I will build the SQL in my code - but its not as
nice.
Mark
----- Original Message -----
Sent: Wednesday, May 30, 2001 4:11
PM
Subject: RE: [DUG]: SQL and
Parameters
Maybe it cannot find an object because the query
has NO parameters (I cannot see where your code creates one). So maybe you
need to add (using CreateParam or otherwise) a Param Object to the
datsets Params (with the name "SaveDate", type Output (I think), ftdate) -
before you call prepare.
Mike
Have tried this change, now. No better. I
assume the question about Short Date Format is only relevant while I am
using the DateToStr format?
I think there must be something quitye fundamental, that
I have not passed on to you guys.
I assume that I can use a vanilla TQuery with no
properties set; and that setting the ParamByName is ALL I need to.
(I have also tried Params[0].AsDate := CurrentDate.)
Is there some other fundamental aspect that I may not be
aware of?
Mark
----- Original Message -----
Sent: Wednesday, May 30, 2001 3:22
PM
Subject: Re: [DUG]: SQL and
Parameters
Mark
Have you tried -
ParamByName('SaveDate').AsDate :=
CurrentDate;
as opposed to
ParamByName('SaveDate').AsString :=
DateToStr(CurrentDate);
What is your Short Date Format - dd/mm/yy
or mm/dd/yy?
DateToStr may not be giving you a valid
date for SQL
Why you would get "could not find object",
I don't know.
HTH
Mike
----- Original Message -----
Sent: Wednesday, May 30, 2001
10:03 AM
Subject: [DUG]: SQL and
Parameters
Hi
Using Paradox.
When I run the following SQL code (DocNos.Sql) using
the LoadFromFile method, things work fine;
Delete from DocketNos
Where DocketNo in
(
Select DocketNo from Dockets
Where ForCode not in (
Select
distinct forcode from dockets
where docketdate >
'03/31/2001'))
But when I try to parameterise it as follows, and
with the final line of the Sql file changed to :
where docketdate > :SaveDate))
then I get an error message "Could not find
object"
procedure RunPQuery(SQLFile:
string);
begin
with RSQuery
do
begin
Close;
Unprepare;
SQL.LoadFromFile('DocNos.SQL');
ParamByName('SaveDate').AsString :=
DateToStr(CurrentDate);
Prepare;
Open;
MainForm.Memo.Lines.Add('Done');
end;
end;
Can any one see where I have gone
wrong?
TIA
Mark
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