problem to SELECT using Microsoft Access (sent again, connection problem)

problem to SELECT using Microsoft Access (sent again, connection problem)

Post by Rober » Mon, 15 May 2006 22:26:50


Hello,
------------
I am posting my question again, because I got a message, saying that
my message is invisible for most of the user. I am using Forte agent
and I can read my message.
------------

I am apologizes if I am asking this question again and again. I
browse quickly the messages, but cannot find similar question:

I Want to make simple SELECT statement against Microsoft Access table.
Everything is very simple, the table has two column and I want to do:

SELECT Colimn2
FROM Table
WHERE Column1 = 'XYZ'

In my Delphi source code I have TADOConnection and TADOQuery
component. Next is my source code:

procedure TForm1.Button1Click(Sender: TObject);
var
sDB: string;
begin
sDB := (ExtractFilePath(Application.ExeName) + 'Test.mdb');
adoConn.ConnectionString :=
'Provider=Microsoft.Jet.OLEDB.4.0;' +
'Data Source=' + sDB + ';' +
'Mode=Share Deny None;' +
'Extended Properties="";' +
'Persist Security Info=False;' +
'Jet OLEDB:System database="";' +
'Jet OLEDB:Registry Path="";' +
'Jet OLEDB:Engine Type=5;' +
'Jet OLEDB:Database Locking Mode=1;' +
'Jet OLEDB:Global Partial Bulk Ops=2;' +
'Jet OLEDB:Global Bulk Transactions=1;' +
'Jet OLEDB:New Database Password="";' +
'Jet OLEDB:Create System Database=True;' +
'Jet OLEDB:Encrypt Database=False;' +
'Jet OLEDB:Don''t Copy Locale on Compact=False;' +
'Jet OLEDB:Compact Without Replica Repair=False;' +
'Jet OLEDB:SFP=False';
adoConn.Open;

with ADOQuery1 do begin
Sql.Text:=
' SELECT Column2' +
' FROM Table' +
' where Column1 = :param1';

Parameters[0].DataType:= ftString;
Parameters[0].Direction:= pdInput;
Parameters.ParamByName('param1').Value:= 'THREAT_EVENTS';

Open;
end;
end.

On open ADOQuery1 I got an exception:

Project Project1.exe raised exception class EOleException with message
'No value given for one or more required parameters'.

I thing something is wrong in my source code. I know Microsoft Access
has very odd rules.
I will appreciate if someone could help me.

Thank you.

Robert.
 
 
 

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