TAdoQuery hits size max to give Application uses value of wrong type error

it is better to specify the type of the parameters manifestly:

Query.Parameters.ParamByName('IntParam1').AsInteger := IntValue1;
//................
Query.Parameters.ParamByName('StrParam1').AsString := StrValue1;
//................
Query.Parameters.ParamByName('FloatParam1').AsFloat := FloatValue1;

emil

Ok, thanks. Could tat account for the error? Tom.

>Could tat account for the error?
no, because ado-parameters do not provide As...-conversions.

try to define the paramtype and datatype of the parameter you want to use

meikl ;-)

Hi  tomcorcoran , if i don't misunderstood you want to execute a code like this :

procedure TForm1.Button1Click(Sender: TObject);
begin

with adoquery1.parameters do begin
ParamByName('F1').Value := 'uniqueidentifie1';
ParamByName('F2').Value := 'uniqueidentifie2';
ParamByName('F3').Value := 'uniqueidentifie3';
ParamByName('F4').Value := 'uniqueidentifie4';

ParamByName('F5').Value := 123456;
ParamByName('F6').Value := 123456;
ParamByName('F7').Value := 123456;
ParamByName('F8').Value := 123456;
ParamByName('F9').Value := 123456;
ParamByName('F10').Value := 123456;
ParamByName('F11').Value := 123456;
ParamByName('F12').Value := 123456;
ParamByName('F13').Value := 123456;
ParamByName('F14').Value := 123456;
ParamByName('F15').Value := 123456;
ParamByName('F16').Value := 123456;
ParamByName('F17').Value := 123456;
ParamByName('F18').Value := 123456;
ParamByName('F19').Value := 123456;
ParamByName('F20').Value := 123456;
ParamByName('F21').Value := 123456;
ParamByName('F22').Value := 123456;
ParamByName('F23').Value := 123456;
ParamByName('F24').Value := 123456;
ParamByName('F25').Value := 123456;
ParamByName('F26').Value := 123456;
ParamByName('F27').Value := 123456;

ParamByName('F28').Value := 'ntextntextntextn';

ParamByName('F29').Value := 1.5;
ParamByName('F30').Value := 1.5;
ParamByName('F31').Value := 1.5;
ParamByName('F32').Value := 1.5;
ParamByName('F33').Value := 1.5;
ParamByName('F34').Value := 1.5;
ParamByName('F35').Value := 1.5;
ParamByName('F36').Value := 1.5;
ParamByName('F37').Value := 1.5;
ParamByName('F38').Value := 1.5;
ParamByName('F39').Value := 1.5;
ParamByName('F40').Value := 1.5;
ParamByName('F41').Value := 1.5;
ParamByName('F42').Value := 1.5;
ParamByName('F43').Value := 1.5;
ParamByName('F44').Value := 1.5;
ParamByName('F45').Value := 1.5;
ParamByName('F46').Value := 1.5;
ParamByName('F47').Value := 1.5;
ParamByName('F48').Value := 1.5;
ParamByName('F49').Value := 1.5;
ParamByName('F50').Value := 1.5;
ParamByName('F51').Value := 1.5;
ParamByName('F52').Value := 1.5;
end;

adoquery1.ExecSQL;
end;

and for example a query statemet like this :

insert into yourtable values(:F1,:F2,:F3,:F4,:F5,:F6,:F7,:F8,:F9,:F10,:F11,:F12,:F13,:F14,:F15,:F16,:F17,:F18,:F19,:F20,:F21,:F22,:F23,:F24,:F25,:F26,:F27,:F28,:F29,:F30,:F31,:F32,:F33,:F34,:F35,:F36,:F37,:F38,:F39,:F40,:F41,:F42,:F43,:F44,:F45,:F46,:F47,:F48,:F49,:F50,:F51,:F52);


but i did execute that and didn't get error!

let me know if i do misunderstand somethings

Regards
Azhdari

Thanks for the comments.

<<try to define the paramtype and datatype of the parameter you want to use>>
Meikl, I do not follow you.

Geo, interesting observation. Is thera any documentation on this problem?

Azhdari, that's right, I get the error on one of the
ParamByName('F??').Value := 1.5;
lines. We even got it in a small test project, so interesting you got no problems.

To get past this we had to split it into 2 tables, insane.

Tom.

Thanks Meikl. You think this will stop the error? Any info on why it happens?

>Thanks Meikl. You think this will stop the error?

its just a guess ;-)

>Any info on why it happens?

specially
the datatype-property is set by default to ftUnknown,
which may cause that the variant-conversion fails (depending on the value)

i have done a mistake here
ParamByName('F??').ParamType := ptInput;

should be
ParamByName('F??').Direction := pdInput;

meikl ;-)

Ok. What's the default for Direction? Bit of a pain to set them all to pdInput. Thanks, Tom.

>Ok. What's the default for Direction?

the default is pdInput -> there is nothing to do

except you have output-parameters
(guess no in your case),
in this case it must be explicitly set

meikl ;-)

tomcorcoran , i got no error for this statement
insert into yourtable values(:F1,:F2,......);

by the way , you don't need to set paramtype and datatype of the parameters manually, Adoquery will manage these
automatically everytime you execute SELECT/INSERT/UPDATE queries, you need to set these parameters just when you want to
create tables


anyway write me the sql text which you are trying to execute and get error

Regards
Azhdari

Azhdari, others are giving contrary information on setting the datatype...It is something I will try. We are using a framework so it's not so easy to
extract the code. Never had this problem before. Don't know why we hit this max now. It sounds like it is a known problem
but I have yet to see any documentatrion.

Tom.

>Is thera any documentation on this problem?

I don't know. It's based on one of my colleagues experience and perhaps depends on Delphi and/or MDAC version. I've said 'I would ..' but actually that's what I always do (create SQL statements dynamically in code) except for static SQLs, of course.

Meikl,

In a test project I tried setting the datatype for all the parameters and this error still happens. We are using a framework which looks for the
paremeters so not using them is not am option.

 It looks like we will have to leave in the second table solution which is very frustrating. there seems to be some concensus about this being
a known problembut it's strange why there is nothing written about it anywhere.

Does anyone else know anything?

Thanks, Tom.

hmm, bad,

>Application uses a value of the wrong type for the current operation
>incorrect syntax near @P38
points to a conversion or a syntax problem

what is @P38?
are there any db-triggers involved (which may throw this error)?